EXHIBIT 4.01


                     GREAT LAKES DREDGE & DOCK CORPORATION

                                SERIES A AND B

                  11 1/4% SENIOR SUBORDINATED NOTES DUE 2008


                                   INDENTURE

                          Dated as of August 19, 1998

                             THE BANK OF NEW YORK

                                    Trustee

 
                            CROSS-REFERENCE TABLE*




Trust Indenture
  Act Section                                              Indenture Section
                                                        
310(a)(1)................................................        7.10
   (a)(2)................................................        7.10
   (a)(3)................................................        N.A.
   (a)(4)................................................        N.A.
   (a)(5)................................................        7.10
   (b)...................................................        7.10
   (c)...................................................        N.A.
311(a)...................................................        7.11
   (b)...................................................        7.11
   (c)...................................................        N.A.
312(a)...................................................        2.05
   (b)...................................................       12.03
   (c)...................................................       12.03
313(a)...................................................        7.06
   (b)(2)................................................        7.07
   (c)...................................................  7.06;12.02
   (d)...................................................        7.06
314(a)...................................................  4.03;12.02
   (c)(1)................................................       12.04
   (c)(2)................................................       12.04
   (c)(3)................................................        N.A.
   (e)...................................................       12.05
   (f)...................................................        N.A.
315(a)...................................................        7.01
   (b)...................................................  7.05,12.02
   (c)...................................................        7.01
   (d)...................................................        7.01
   (e)...................................................        6.11
316(a) (last sentence)...................................        2.09
   (a)(1)(A).............................................        6.05
   (a)(1)(B).............................................        6.04
   (a)(2)................................................        N.A.
   (b)...................................................        6.07
   (c)...................................................        2.12
317(a)(1)................................................        6.08
   (a)(2)................................................        6.09
   (b)...................................................        2.04
318(a)...................................................       12.01
   (b)...................................................        N.A.
 


 
                                                             
   (c)...................................................       12.01


N.A.  means not applicable.

 
                               TABLE OF CONTENTS
 
 
                                                                            Page


             ARTICLE 1 DEFINITIONS AND INCORPORATION BY REFERENCE

                                                                          
Section 1.01. Definitions.................................................     1
Section 1.02. Other Definitions...........................................    19
Section 1.03. Incorporation by Reference of Trust Indenture Act...........    19
Section 1.04. Rules of Construction.......................................    20
                                                                              
                              ARTICLE 2 THE NOTES
                                                                              
Section 2.01. Form and Dating.............................................    20
Section 2.02. Execution and Authentication................................    22
Section 2.03. Registrar and Paying Agent..................................    22
Section 2.04. Paying Agent to Hold Money in Trust.........................    23
Section 2.05. Holder Lists................................................    23
Section 2.06. Transfer and Exchange.......................................    23
Section 2.07. Replacement Notes...........................................    35
Section 2.08. Outstanding Notes...........................................    36
Section 2.09. Treasury Notes..............................................    36
Section 2.10. Temporary Notes.............................................    36
Section 2.11. Cancellation................................................    36
Section 2.12. Defaulted Interest..........................................    37
                                                                              
                      ARTICLE 3 REDEMPTION AND PREPAYMENT
                                                                              
Section 3.01. Notices to Trustee..........................................    37
Section 3.02. Selection of Notes to Be Redeemed...........................    37
Section 3.03. Notice of Redemption........................................    38
Section 3.04. Effect of Notice of Redemption..............................    39
Section 3.05. Deposit of Redemption Price.................................    39
Section 3.06. Notes Redeemed in Part......................................    39
Section 3.07. Optional Redemption.........................................    39
Section 3.08. Mandatory Redemption........................................    40
Section 3.09. Offer to Purchase by Application of Excess Proceeds.........    40
                                                                              
                              ARTICLE 4 COVENANTS

Section 4.01. Payment of Notes............................................    42
Section 4.02. Maintenance of Office or Agency.............................    42
Section 4.03. Reports.....................................................    43
Section 4.04. Compliance Certificate......................................    43
Section 4.05. Taxes.......................................................    44
Section 4.06. Stay, Extension and Usury Laws..............................    44
Section 4.07. Restricted Payments.........................................    44
 

                                       i

 
 
                                                                                      
Section 4.08. Dividend and Other Payment Restrictions Affecting Subsidiaries..........  47
Section 4.09. Incurrence of Indebtedness and Issuance of Disqualified Stock...........  48
Section 4.10. Asset Sales.............................................................  51
Section 4.11. Transactions with Affiliates............................................  52
Section 4.12. Liens...................................................................  53
Section 4.13. Business Activities.....................................................  53
Section 4.14. Corporate Existence.....................................................  53
Section 4.15. Offer to Repurchase Upon Change of Control..............................  54
Section 4.16. No Senior Subordinated Debt.............................................  55
Section 4.17. Limitation on Sale and Leaseback Transactions...........................  55
Section 4.18. Limitation on Issuances of Guarantees of Indebtedness...................  55
Section 4.19. Payments for Consent....................................................  56
Section 4.20. Additional Subsidiary Guarantees........................................  56
                                                                                        
                             ARTICLE 5 SUCCESSORS                                       
                                                                                        
Section 5.01. Merger, Consolidation, or Sale of Assets................................  56
Section 5.02. Successor Corporation Substituted.......................................  57
                                                                                        
                        ARTICLE 6 DEFAULTS AND REMEDIES                                 
                                                                                        
Section 6.01. Events of Default.......................................................  57
Section 6.02. Acceleration............................................................  59
Section 6.03. Other Remedies..........................................................  59
Section 6.04. Waiver of Past Defaults.................................................  59
Section 6.05. Control by Majority.....................................................  60
Section 6.06. Limitation on Suits.....................................................  60
Section 6.07. Rights of Holders of Notes to Receive Payment...........................  60
Section 6.08. Collection Suit by Trustee..............................................  61
Section 6.09. Trustee May File Proofs of Claim........................................  61
Section 6.10. Priorities..............................................................  61
Section 6.11. Undertaking for Costs...................................................  62
                                                                                        
                               ARTICLE 7 TRUSTEE                                        
                                                                                        
Section 7.01. Duties of Trustee.......................................................  62
Section 7.02. Rights of Trustee.......................................................  63
Section 7.03. Individual Rights of Trustee............................................  64
Section 7.04. Trustee's Disclaimer....................................................  64
Section 7.05. Notice of Defaults......................................................  65
Section 7.06. Reports by Trustee to Holders of the Notes..............................  65
Section 7.07. Compensation and Indemnity..............................................  65
Section 7.08. Replacement of Trustee..................................................  66
Section 7.09. Successor Trustee by Merger, etc........................................  67
Section 7.10. Eligibility; Disqualification...........................................  67
Section 7.11. Preferential Collection of Claims Against Company.......................  67
 

                                       ii

 
 
              ARTICLE 8 LEGAL DEFEASANCE AND COVENANT DEFEASANCE
                                                                                
Section 8.01. Option to Effect Legal Defeasance or Covenant Defeasance........    67
Section 8.02. Legal Defeasance and Discharge..................................    68
Section 8.03. Covenant Defeasance.............................................    68
Section 8.04. Conditions to Legal or Covenant Defeasance......................    69
Section 8.05. Deposited Money and Government Securities to be                       
              Held in Trust; Other Miscellaneous Provisions.................      70
Section 8.06. Repayment to Company............................................    70
Section 8.07. Reinstatement...................................................    71 
                                                                              
                     ARTICLE 9 AMENDMENT, SUPPLEMENT AND WAIVER                  
                                                                              
Section 9.01. Without Consent of Holders of Notes.............................    71
Section 9.02. With Consent of Holders of Notes................................    72
Section 9.03. Compliance with Trust Indenture Act.............................    73
Section 9.04. Revocation and Effect of Consents...............................    74
Section 9.05. Notation on or Exchange of Notes................................    74
Section 9.06. Trustee to Sign Amendments, etc.................................    74
                                                                                    
                             ARTICLE 10 SUBORDINATION                                 
                                                                                    
Section 10.01. Agreement to Subordinate.......................................    75
Section 10.02. Liquidation; Dissolution; Bankruptcy...........................    75
Section 10.03. Default on Designated Senior Debt..............................    75
Section 10.04. Acceleration of Securities.....................................    76
Section 10.05. When Distribution Must Be Paid Over............................    76
Section 10.06. Notice by Company..............................................    77
Section 10.07. Subrogation....................................................    77
Section 10.08. Relative Rights................................................    77
Section 10.09. Subordination May Not Be Impaired by Company...................    77
Section 10.10. Distribution or Notice to Representative.......................    77
Section 10.11. Rights of Trustee and Paying Agent.............................    78
Section 10.12. Authorization to Effect Subordination..........................    78
Section 10.13. Amendments.....................................................    78
Section 10.14. Trustee Not Fiduciary for Holders of Senior Debt...............    78
                                                                                    
                       ARTICLE 11 SUBSIDIARY GUARANTEES                             
                                                                                    
Section 11.01. Guarantee......................................................    79
Section 11.02. Subordination of Subsidiary Guarantee..........................    80
Section 11.03. Limitation on Guarantor Liability..............................    80
Section 11.04. Execution and Delivery of Subsidiary Guarantee.................    80
Section 11.05. Subsidiary Guarantors May Consolidate, etc., on Certain Terms..    81
Section 11.06. Releases Following Sale of Assets..............................    82 
 

                                      iii

 
 
                                  ARTICLE 12 MISCELLANEOUS
                                                                                                
Section 12.01. Trust Indenture Act Controls.....................................................  82
Section 12.02. Notices..........................................................................  82
Section 12.03. Communication by Holders of Notes with Other Holders of Notes....................  84
Section 12.04. Certificate and Opinion as to Conditions Precedent...............................  84
Section 12.05. Statements Required in Certificate or Opinion....................................  84
Section 12.06. Rules by Trustee and Agents......................................................  84
Section 12.07. No Personal Liability of Directors, Officers, Employees and Stockholders.........  85
Section 12.08. Governing Law....................................................................  85
Section 12.09. No Adverse Interpretation of Other Agreements....................................  85
Section 12.10. Successors.......................................................................  85
Section 12.11. Severability.....................................................................  85
Section 12.12. Counterpart Originals............................................................  85
Section 12.13. Table of Contents, Headings, etc.................................................  85
 

                                   EXHIBITS
Exhibit A1     FORM OF NOTE
Exhibit A2     FORM OF REGULATION S TEMPORARY GLOBAL NOTE
Exhibit B      FORM OF CERTIFICATE OF TRANSFER
Exhibit C      FORM OF CERTIFICATE OF EXCHANGE
Exhibit D      FORM OF CERTIFICATE OF ACQUIRING INSTITUTIONAL ACCREDITED 
               INVESTOR
Exhibit E      FORM OF SUBSIDIARY GUARANTEE
Exhibit F      FORM OF SUPPLEMENTAL INDENTURE

                                       iv

 
      INDENTURE dated as of August 19, 1998 among Great Lakes Dredge & Dock
Corporation, a Delaware corporation (the "Company"), the Subsidiary Guarantors
set forth on Schedule I hereto and The Bank of New York, as trustee (the
"Trustee").

      The Company, the Subsidiary Guarantors and the Trustee agree as follows
for the benefit of each other and for the equal and ratable benefit of the
Holders of the 11 1/4% Series A Senior Subordinated Notes due 2008 (the "Series
A Notes") and the 11 1/4% Series B Senior Subordinated Notes due 2008 (the
"Series B Notes" and, together with the Series A Notes, the "Notes"):

                                   ARTICLE 1
                         DEFINITIONS AND INCORPORATION
                                  BY REFERENCE

Section 1.01.  Definitions.

      "144A Global Note" means a global note substantially in the form of
Exhibit A1 hereto bearing the Global Note Legend and the Private Placement
Legend and deposited with or on behalf of, and registered in the name of, the
Depositary or its nominee that will be issued in a denomination equal to the
outstanding principal amount of the Notes sold in reliance on Rule 144A.

      "Acquired Debt" means, with respect to any specified Person, (i)
Indebtedness of any other Person existing at the time such other Person is
merged with or into or became a Subsidiary of such specified Person, including,
without limitation, Indebtedness incurred in connection with, or in
contemplation of, such other Person merging with or into or becoming a
Subsidiary of such specified Person, and (ii) Indebtedness secured by a Lien
encumbering any asset acquired by such specified Person.

      "AcquisitionCo" means Great Lakes Dredge & Dock Acquisition, Inc., a
Delaware corporation.

      "Additional Notes" means up to $40.0 million aggregate principal amount of
Notes (other than the Initial Notes) issued under this Indenture in accordance
with Sections 2.02 and 4.09 hereof, as part of the same series as the Initial
Notes.

      "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person.  For purposes of this definition, "control"
(including, with correlative meanings, the terms "controlling," "controlled by"
and "under common control with"), as used with respect to any Person, shall mean
the possession, directly or indirectly, of the power to direct or cause the
direction of the management or policies of such Person, whether through the
ownership of voting securities, by agreement or otherwise; provided that
beneficial ownership of 10% or more of the Voting Stock of a Person shall be
deemed to be control.

      "Agent" means any Registrar, Paying Agent or co-registrar.

                                       1

 
      "Applicable Procedures" means, with respect to any transfer or exchange of
or for beneficial interests in any Global Note, the rules and procedures of the
Depositary, Euroclear and Cedel that apply to such transfer or exchange.

      "Asset Sale" means (i) the sale, lease, conveyance or other disposition of
any assets or rights (including, without limitation, by way of a sale and
leaseback) other than sales of inventory in the ordinary course of business
consistent with past practices (provided that the sale, conveyance or other
disposition of all or substantially all of the assets of the Company and its
Subsidiaries, taken as a whole, will be governed by the provisions of Section
4.15 and/or Section 5.01 hereof and not by the provisions of Section 4.10
hereof), and (ii) the issue or sale by any Restricted Subsidiary of Equity
Interests of any of the Company's Subsidiaries, in the case of either clause (i)
or (ii), whether in a single transaction or a series of related transactions (a)
that have a fair market value in excess of $2.0 million or (b) for net proceeds
in excess of $2.0 million.  Notwithstanding the foregoing, the following items
shall not be deemed to be Asset Sales: (i) a transfer of assets by the Company
to a Wholly Owned Restricted Subsidiary or by a Wholly Owned Restricted
Subsidiary to the Company or to another Wholly Owned Restricted Subsidiary, (ii)
an issuance of Equity Interests by a Wholly Owned Restricted Subsidiary to the
Company or to another Wholly Owned Restricted Subsidiary, (iii) a Restricted
Payment that is permitted by Section 4.07 hereof, (iv) the sale and leaseback of
any assets within 120 days of the date of acquisition or completion of
construction of such assets, (v) the sale at fair market value of property or
equipment that has become worn out, obsolete or damaged or otherwise unsuitable
for use in connection with the business of the Company or any Restricted
Subsidiary, as the case may be, in the ordinary course of business and (vi)
bare-boat charters entered into in the ordinary course of business for a term
not to exceed 12 months.

      "Attributable Debt" means in respect of a sale and leaseback transaction,
at the time of determination, the present value (discounted at the rate of
interest implicit in such transaction, determined in accordance with GAAP) of
the obligation of the lessee for net rental payments during the remaining term
of the lease included in such sale and leaseback transaction (including any
period for which such lease has been extended or may, at the option of the
lessor, be extended).

      "Bankruptcy Law" means Title 11, U.S.  Code or any similar federal or
state law for the relief of debtors.

      "Board of Directors" means the Board of Directors of the Company, or any
authorized committee of the Board of Directors.

      "Broker-Dealer" has the meaning set forth in the Registration Rights
Agreement.

      "Business Day" means any day other than a Legal Holiday.

      "Capital Lease Obligation" means, at the time any determination thereof is
to be made, the amount of the liability in respect of a capital lease that would
at such time be required to be capitalized on a balance sheet in accordance with
GAAP.

                                       2

 
      "Capital Stock" means (i) in the case of a corporation, corporate stock,
(ii) in the case of an association or business entity, any and all shares,
interests, participations, rights or other equivalents (however designated) of
corporate stock, (iii) in the case of a partnership or limited liability
company, partnership or membership interests (whether general or limited) and
(iv) any other interest or participation that confers on a Person the right to
receive a share of the profits and losses of, or distributions of assets of, the
issuing Person.

      "Cash Equivalents" means (i) United States dollars, (ii) securities issued
or directly and fully guaranteed or insured by the United States government or
any agency or instrumentality thereof (provided that the full faith and credit
of the United States is pledged in support thereof) having maturities of not
more than one year from the date of acquisition, (iii) certificates of deposit
and eurodollar time deposits with maturities of one year or less from the date
of acquisition, bankers' acceptances with maturities not exceeding one-year and
overnight bank deposits, in each case with any domestic commercial bank having
capital and surplus in excess of $500 million, (iv) repurchase obligations with
a term of not more than thirty days for underlying securities of the types
described in clauses (ii) and (iii) above entered into with any financial
institution meeting the qualifications specified in clause (iii) above, (v)
obligations issued or fully guaranteed by any state of the United States of
America or any political subdivision of any such state or any public
instrumentality thereof maturing within one year from the date of acquisition
thereof and, at the time of acquisition, having one of the two highest ratings
obtainable from either Standard & Poor's Corporation or Moody's Investors
Service, Inc., (vi) commercial paper having the highest rating obtainable from
Moody's Investors Service, Inc.  or Standard & Poor's Corporation and in each
case maturing within one year after the date of acquisition, (vii) money market
funds at least 95% of the assets of which constitute Cash Equivalents of the
kinds described in clauses (i) through (vii) of this definition and (viii)
short-term asset management accounts offered by any lender under Credit
Facilities for the purpose of investing in notes issued by a corporation (other
than the Company or any Affiliate of the Company) organized under the laws of
any state of the United States or of the District of Columbia and rated A-2 or
higher by Standard & Poor's Rating Group, a division of McGraw Hill, Inc.  or P-
2 or higher by Moody's Investors Service, Inc.

      "Cedel" means Cedel Bank, SA.

      "Change of Control" means the occurrence of any of the following: (i) the
sale, lease, transfer, conveyance or other disposition (other than by way of
merger or consolidation), in one or a series of related transactions, of all or
substantially all of the assets of the Company and its Subsidiaries (determined
on a consolidated basis), in each case, to any "person" (as such term is used in
Section 13(d)(3) of the Exchange Act) other than the Company or a Wholly Owned
Restricted Subsidiary or any Principal or a Related Party of a Principal, (ii)
the adoption of a plan relating to the liquidation or dissolution of the Company
(other than in a transaction which complies with the provisions of Section 5.01
hereof), (iii) the consummation of any transaction (including, without
limitation, any merger or consolidation) the result of which is that any
"person" (as defined above), other than one or more Principals or their Related
Parties, becomes the "beneficial owner" (as such term is defined in Rule 13d-3
and Rule 13d-5 under the Exchange Act, except that a person shall be deemed to
have "beneficial ownership" of all securities that such person has the right to
acquire, whether such right is currently exercisable or is exercisable only upon
the occurrence of a subsequent condition), directly or indirectly, of more than
50% of the Voting Stock of the Company (measured by voting power rather than
number of

                                       3

 
shares) and the Principals do not beneficially own as much or more of the Voting
Stock of the Company (measured by voting power rather than by number of shares)
than such person or (iv) the first day on which a majority of the members of the
Board of Directors of the Company are not Continuing Directors.

      "Citicorp" means Citicorp, a Delaware corporation, or any successor
thereto by merger or consolidation.

      "Company" means Great Lakes Dredge & Dock Corporation, a Delaware
corporation and successor by merger to AcquisitionCo, and any and all successors
thereto.

      "Consolidated Cash Flow" means, with respect to any Person for any period,
the Consolidated Net Income of such Person for such period plus (i) an amount
equal to any extraordinary or nonrecurring loss plus any net loss realized in
connection with an Asset Sale, to the extent such losses were deducted in
computing such Consolidated Net Income, plus (ii) provision for taxes based on
income or profits of such Person and its Restricted Subsidiaries for such
period, to the extent that such provision for taxes was deducted in computing
such Consolidated Net Income, plus (iii) consolidated interest expense of such
Person and its Restricted Subsidiaries for such period, whether paid or accrued
and whether or not capitalized (including, without limitation, amortization of
debt issuance costs and original issue discount, non-cash interest payments, the
interest component of any deferred payment obligations, the interest component
of all payments associated with Capital Lease Obligations, imputed interest with
respect to Attributable Debt, commissions, discounts and other fees and charges
incurred in respect of letter of credit or bankers' acceptance financings, and
net payments (if any) pursuant to Hedging Obligations), to the extent that any
such expense was deducted in computing such Consolidated Net Income, plus (iv)
depreciation, amortization (including amortization of goodwill and other
intangibles but excluding amortization of prepaid cash expenses that were paid
in a prior period) and other non-cash expenses (excluding any such non-cash
expense to the extent that it represents an accrual of or reserve for cash
expenses in any future period or amortization of a prepaid cash expense that was
paid in a prior period) of such Person and its Restricted Subsidiaries for such
period to the extent that such depreciation, amortization and other non-cash
expenses were deducted in computing such Consolidated Net Income, plus, without
duplication, plus (v) any interest expense on Indebtedness of another person
that is guaranteed by such person or a Subsidiary of such person or secured by a
Lien on the assets of such person or one of its Subsidiaries (to the extent that
such interest expense was deducted in computing Consolidated Net Income in such
period), plus (vi) expenses and charges of the Company related to the
Transaction incurred or for which the Company became obligated on or prior to or
within 30 days after the date of this Indenture plus (vii) incremental expenses
incurred associated with the Chicago Flood Litigation not exceeding $800,000,
minus (viii) non-cash items increasing such Consolidated Net Income for such
period, in each case, on a consolidated basis and determined in accordance with
GAAP.

      "Consolidated Net Income" means, with respect to any Person for any
period, the aggregate of the Net Income of such Person and its Restricted
Subsidiaries for such period, on a consolidated basis, determined in accordance
with GAAP; provided that (i) the Net Income (but not loss) of any Person that is
not a Restricted Subsidiary or that is accounted for by the equity method of
accounting shall be included only to the extent of the amount of dividends or
distributions paid in cash to the referent Person or a Wholly Owned Restricted
Subsidiary thereof, (ii) the Net Income of any Restricted Subsidiary shall be
excluded to the extent that the declaration or payment of dividends or similar
distributions by that

                                       4

 
Restricted Subsidiary of that Net Income is not at the date of determination
permitted without any prior governmental approval (that has not been obtained)
or, directly or indirectly, by operation of the terms of its charter or any
agreement, instrument, judgment, decree, order, statute, rule or governmental
regulation applicable to that Restricted Subsidiary or its stockholders, (iii)
the Net Income of any Person acquired in a pooling of interests transaction for
any period prior to the date of such acquisition shall be excluded, (iv) the
cumulative effect of a change in accounting principles shall be excluded and (v)
the Net Income (but not loss) of any Unrestricted Subsidiary shall be excluded,
whether or not distributed to the Company or one of its Subsidiaries.

      "Continuing Directors" means, as of any date of determination, any member
of the Board of Directors of the Company who (i) was a member of such Board of
Directors on the date of this Indenture or (ii) was nominated for election or
elected to such Board of Directors with the approval of a majority of the
Continuing Directors who were members of such Board at the time of such
nomination or election or was designated by a Principal or a Related Party of a
Principal.

      "Corporate Trust Office of the Trustee" shall be at the address of the
Trustee specified in Section 12.02 hereof or such other address as to which the
Trustee may give notice to the Company.

      "Credit Facilities" means, with respect to the Company or its Restricted
Subsidiaries, one or more debt facilities (including, without limitation, the
New Credit Facility) or commercial paper facilities with banks or other
institutional lenders providing for revolving credit loans, term loans,
receivables financing (including through the sale of receivables to such lenders
or to special purpose entities formed to borrow from such lenders against such
receivables) or letters of credit, in each case, as increased as permitted by
the terms hereof, and amended, restated, modified, renewed, refunded, replaced
or refinanced in whole or in part from time to time.

      "CVC" means Citicorp Venture Capital, Ltd., a New York corporation, or any
successor thereto by merger or consolidation.

      "Custodian" means the Trustee, as custodian with respect to the Notes in
global form, or any successor entity thereto.

      "Default" means any event that is or with the passage of time or the
giving of notice or both would be an Event of Default.

      "Definitive Note" means a certificated Note registered in the name of the
Holder thereof and issued in accordance with Section 2.06 hereof, substantially
in the form of Exhibit A1 hereto except that such Note shall not bear the Global
Note Legend and shall not have the "Schedule of Exchanges of Interests in the
Global Note" attached thereto.

      "Depositary" means, with respect to the Notes issuable or issued in whole
or in part in global form, the Person specified in Section 2.03 hereof as the
Depositary with respect to the Notes, and any and all successors thereto
appointed as depositary hereunder and having become such pursuant to the
applicable provision of this Indenture.

                                       5

 
      "Designated Senior Debt" means (i) any Obligations outstanding under the
New Credit Facility (including letters of credit), (ii) any Permitted Bonding
Obligation and (iii) any other Senior Debt permitted hereunder the principal
amount of which is $50.0 million or more and that has been designated by the
Company as "Designated Senior Debt." Notwithstanding the foregoing, Indebtedness
under the New Credit Facility shall be deemed outstanding for purposes of this
definition at all times when the lenders thereunder have an effective commitment
to extend credit thereunder, regardless of whether any such Indebtedness is
actually outstanding at such time.

      "Disqualified Stock" means any Capital Stock that, by its terms (or by the
terms of any security into which it is convertible, or for which it is
exchangeable, at the option of the holder thereof), or upon the happening of any
event, matures or is mandatorily redeemable, pursuant to a sinking fund
obligation or otherwise, or redeemable at the option of the Holder thereof in
whole or in part, on or prior to November 14, 2008; provided, however, that any
Capital Stock that would constitute Disqualified Stock solely because the
holders thereof have the right to require the Company to repurchase such Capital
Stock upon the occurrence of a Change of Control or an Asset Sale shall not
constitute Disqualified Stock if the terms of such Capital Stock provide that
the Company may not repurchase or redeem any such Capital Stock pursuant to such
provisions unless such repurchase or redemption complies with Section 4.07
hereof.

      "Equity Interests" means Capital Stock and all warrants, options or other
rights to acquire Capital Stock (but excluding any debt security that is
convertible into, or exchangeable for, Capital Stock).

      "Euroclear" means Morgan Guaranty Trust Company of New York, Brussels
office, as operator of the Euroclear system.

      "Exchange Act" means the Securities Exchange Act of 1934, as amended.

      "Exchange Notes" means the Notes issued in the Exchange Offer pursuant to
Section 2.06(f) hereof.

      "Exchange Offer" has the meaning set forth in the Registration Rights
Agreement.

      "Exchange Offer Registration Statement" has the meaning set forth in the
Registration Rights Agreement.

      "Existing Indebtedness" means Indebtedness (including Guarantees) of the
Company and its Subsidiaries (other than Indebtedness under the New Credit
Facility) in existence on the date of this Indenture, until such amounts are
permanently repaid.

      "Fixed Charges" means, with respect to any Person for any period, the sum,
without duplication, of (i) the consolidated interest expense of such Person and
its Restricted Subsidiaries for such period, whether paid or accrued (including,
without limitation, amortization of debt issuance costs and original issue
discount, non-cash interest payments, the interest component of any deferred
payment obligations, the interest component of all payments associated with
Capital Lease Obligations, imputed

                                       6

 
interest with respect to Attributable Debt, commissions, discounts and other
fees and charges incurred in respect of letter of credit or bankers' acceptance
financings, and net payments (if any) pursuant to interest Hedging Obligations;
provided, however, that in no event shall any amortization of deferred financing
costs incurred in connection with the Transaction be included in Fixed Charges)
and (ii) the consolidated interest of such Person and its Restricted
Subsidiaries that was capitalized during such period, and (iii) any interest
expense on Indebtedness of another Person that is Guaranteed by such Person or
one of its Restricted Subsidiaries or secured by a Lien on assets of such Person
or one of its Restricted Subsidiaries (whether or not such Guarantee or Lien is
called upon) and (iv) the product of (a) all cash dividend payments and non-cash
dividend payments, on any series of preferred stock and any series of
Disqualified Stock, in each case, of such Person or any of its Restricted
Subsidiaries, other than dividend payments (x) on Equity Interests payable
solely in Equity Interests of the Company (other than Disqualified Stock) or (y)
to the Company or a Subsidiary Guarantor, times (b) a fraction, the numerator of
which is one and the denominator of which is one minus the then current combined
federal, state and local statutory tax rate of such Person, expressed as a
decimal, in each case, on a consolidated basis and in accordance with GAAP.

      "Fixed Charge Coverage Ratio" means with respect to any Person for any
period, the ratio of the Consolidated Cash Flow of such Person for such period
to the Fixed Charges of such Person for such period.  In the event that the
referent Person or any of its Restricted Subsidiaries incurs, assumes,
Guarantees, repays or redeems any Indebtedness (other than repayment of
revolving credit borrowings that are not accompanied by a permanent reduction in
the commitment amount) or issues or redeems preferred stock subsequent to the
commencement of the period for which the Fixed Charge Coverage Ratio is being
calculated but prior to the date on which the event for which the calculation of
the Fixed Charge Coverage Ratio is made (the "Calculation Date"), then the Fixed
Charge Coverage Ratio shall be calculated giving pro forma effect to such
incurrence, assumption, Guarantee or redemption of Indebtedness, or such
issuance or redemption of preferred stock, as if the same had occurred at the
beginning of the applicable four-quarter reference period.  In addition, for
purposes of making the computation referred to above, (i) acquisitions that have
been made by the Company or any of its Restricted Subsidiaries, including
through mergers (including the Merger) or consolidations and including any
related financing transactions, during the four-quarter reference period or
subsequent to such reference period and on or prior to the Calculation Date
shall be deemed to have occurred on the first day of the four-quarter reference
period and Consolidated Cash Flow for such reference period shall be calculated
without giving effect to clause (iii) of the proviso set forth in the definition
of Consolidated Net Income, (ii) the Consolidated Cash Flow attributable to
discontinued operations, as determined in accordance with GAAP, and operations
or businesses disposed of prior to the Calculation Date, shall be excluded, and
(iii) the Fixed Charges attributable to discontinued operations, as determined
in accordance with GAAP, and operations or businesses disposed of prior to the
Calculation Date, shall be excluded, but only to the extent that the obligations
giving rise to such Fixed Charges will not be obligations of the referent Person
or any of its Restricted Subsidiaries following the Calculation Date.

      "GAAP" means generally accepted accounting principles set forth in the
opinions and pronouncements of the Accounting Principles Board of the American
Institute of Certified Public Accountants and statements and pronouncements of
the Financial Accounting Standards Board or in such other statements by such
other entity as have been approved by a significant segment of the accounting
profession, which are in effect on the date of this Indenture.

                                       7

 
      "Global Notes" means, individually and collectively, each of the
Restricted Global Notes and the Unrestricted Global Notes, substantially in the
form of Exhibit A hereto issued in accordance with Section 2.01, 2.06(b)(iv),
2.06(d)(ii) or 2.06(f) hereof.

      "Global Note Legend" means the legend set forth in Section 2.06(g)(ii),
which is required to be placed on all Global Notes issued under this Indenture.

      "Government Securities" means direct obligations of, or obligations
guaranteed by, the United States of America, and the payment for which the
United States pledges its full faith and credit.

      "Guarantee" means a guarantee (other than by endorsement of negotiable
instruments for collection in the ordinary course of business), direct or
indirect, in any manner (including, without limitation, letters of credit and
reimbursement agreements in respect thereof), of all or any part of any
Indebtedness.

      "Hedging Obligations" means, with respect to any Person, the obligations
of such Person under (i) interest rate or currency swap agreements, interest
rate cap agreements and interest rate collar agreements, (ii) other agreements
or arrangements solely designed to protect such Person against fluctuations in
interest or currency exchange rates and (iii) commodities purchase and sale
agreements and other similar agreements designed to protect such Person against
fluctuations in the price of raw materials used by the Company and its
Restricted Subsidiaries in the ordinary course of business.

      "Holder" means a Person in whose name a Note is registered.

      "Indebtedness" means, with respect to any Person, any indebtedness of such
Person, whether or not contingent, in respect of borrowed money or evidenced by
bonds, notes, debentures or similar instruments or letters of credit (or
reimbursement agreements in respect thereof) or banker's acceptances or
representing Capital Lease Obligations or the balance deferred and unpaid of the
purchase price of any property or representing any Hedging Obligations, except
any such balance that constitutes an accrued expense or trade payable, if and to
the extent any of the foregoing (other than letters of credit, Hedging
Obligations and Attributable Debt) would appear as a liability upon a balance
sheet of such Person prepared in accordance with GAAP, as well as all
Indebtedness of others secured by a Lien on any asset of such Person (whether or
not such Indebtedness is assumed by such Person) and, to the extent not
otherwise included, the Guarantee by such Person of any indebtedness of any
other Person.  The amount of any Indebtedness (other than Hedging Obligations,
guarantees and Attributable Debt) outstanding as of any date shall be (i) the
accreted value thereof, in the case of any Indebtedness issued with original
issue discount, and (ii) the principal amount thereof, together with any
interest thereon that is more than 30 days past due, in the case of any other
Indebtedness.

      "Indenture" means this Indenture, as amended or supplemented from time to
time.

      "Indirect Participant" means a Person who holds a beneficial interest in a
Global Note through a Participant.

                                       8

 
      "Initial Notes" means the first $115,000,000 aggregate principal amount of
Notes issued under this Indenture on the date hereof.

      "Institutional Accredited Investor" means an institution that is an
"accredited investor" as defined in Rule 501(a)(1), (2), (3) or (7) under the
Securities Act, who are not also QIBs.

      "Investments" means, with respect to any Person, all investments by such
Person in other Persons (including Affiliates) in the forms of direct or
indirect loans (including guarantees of Indebtedness or other obligations),
advances or capital contributions (excluding commission, travel and similar
advances to officers and employees made in the ordinary course of business),
purchases or other acquisitions of Indebtedness, Equity Interests or other
securities, together with all items that are or would be classified as
investments on a balance sheet prepared in accordance with GAAP; provided that
an acquisition of Equity Interests or other securities by the Company or any of
its Restricted Subsidiaries for consideration consisting solely of Equity
Interests (other than Disqualified Stock) of the Company shall not be deemed to
be an Investment. If the Company or any Restricted Subsidiary of the Company
sells or otherwise disposes of any Equity Interests of any direct or indirect
Restricted Subsidiary of the Company such that, after giving effect to any such
sale or disposition, such Person is no longer a Restricted Subsidiary of the
Company, the Company shall be deemed to have made an Investment on the date of
any such sale or disposition equal to the fair market value of the Equity
Interests of such Restricted Subsidiary not sold or disposed of in an amount
determined as provided in the final paragraph of Section 4.07 hereof.

      "Legal Holiday" means a Saturday, a Sunday or a day on which banking
institutions in the City of New York or at a place of payment are authorized by
law, regulation or executive order to remain closed.  If a payment date is a
Legal Holiday at a place of payment, payment may be made at that place on the
next succeeding day that is not a Legal Holiday, and no interest shall accrue on
such payment for the intervening period.

      "Letter of Transmittal" means the letter of transmittal to be prepared by
the Company and sent to all Holders of the Notes for use by such Holders in
connection with the Exchange Offer.

      "Lien" means, with respect to any asset, any mortgage, lien, pledge,
charge, security interest or encumbrance of any kind in respect of such asset,
whether or not filed, recorded or otherwise perfected under applicable law
(including any conditional sale or other title retention agreement, any lease in
the nature thereof, any option or other agreement to sell or give a security
interest in and any filing of or agreement to give any financing statement under
the Uniform Commercial Code (or equivalent statutes) of any jurisdiction).

      "Liquidated Damages" means all liquidated damages then owing pursuant to
Section 5 of the Registration Rights Agreement.

      "Management Investors" means certain members of management of the Company
that own capital stock of the Company.

                                       9

 
      "Merger" means, in connection with the Recapitalization and pursuant to
the Merger Agreement, the merger of AcquisitionCo with and into the Company,
with the Company as the surviving entity.

      "Merger Agreement" means the Agreement and Plan of Merger, dated July 20,
1998, among Vectura, AcquisitionCo, GLI Acquisition, Inc., the Company, Great
Lakes International, Inc., Blackstone Dredging Partners, L.P. and Blackstone
Family Investment Partnership L.P, as amended and restated on August 19, 1998.

      "Net Income" means, with respect to any Person for any period, the net
income (loss) of such Person, determined in accordance with GAAP and before any
reduction in respect of dividends on preferred interests, (i) excluding,
however, (a) any gain (but not loss), together with any related provision for
taxes on such gain (but not loss), realized in connection with (1) any Asset
Sale (including, without limitation, dispositions pursuant to sale and leaseback
transactions) or (2) the disposition of any securities by such Person or any of
its Restricted Subsidiaries or the extinguishment of any Indebtedness of such
Person or any of its Restricted Subsidiaries and (b) any extraordinary or
nonrecurring gain (but not loss), together with any related provision for taxes
on such extraordinary or nonrecurring gain (but not loss) and (ii) less the
aggregate amount of all Restricted Payments made by such Person or any of its
Restricted Subsidiaries for such period pursuant to clause (vii) of Section 4.07
hereof to the extent not otherwise deducted in computing such Net Income.

      "Net Proceeds" means the aggregate cash proceeds received by the Company
or any of its Restricted Subsidiaries in respect of any Asset Sale (including,
without limitation, any cash received upon the sale or other disposition of any
non-cash consideration received in any Asset Sale), net of the direct costs
relating to such Asset Sale (including, without limitation, legal, accounting
and investment banking fees, and sales commissions) and any relocation expenses
incurred as a result thereof, any taxes paid or payable as a result thereof
(after taking into account any available tax credits or deductions and any tax
sharing arrangements), and any reserve for adjustment in respect of the sale
price of such asset or assets established in accordance with GAAP.

      "New Bonding Agreement" means that certain second Amended and Restated
Underwriting and Continuing Indemnity Agreement, dated as of the date of this
Indenture, by and among the Company, certain of its Subsidiaries and the
Sureties, including any related notes, guarantees, collateral documents,
instruments and agreements executed in connection therewith, as amended,
restated, modified, renewed, refunded, replaced or refinanced from time to time.

      "New Credit Facility" means that certain Credit Agreement, dated as of the
date of this Indenture, by and among the Company, Bank of America National Trust
and Savings Association, as agent, and certain other lenders party thereto,
initially providing for up to $55.0 million of revolving credit borrowings and
$55.0 million of term borrowings, including any related notes, guarantees,
collateral documents, instruments and agreements executed in connection
therewith, and in each case as increased as permitted by the terms hereof, and
amended, modified, renewed, restated, refunded, replaced or refinanced from time
to time.

                                       10

 
      "Non-Recourse Debt" means Indebtedness (i) as to which neither the Company
nor any of its Restricted Subsidiaries (a) provides credit support of any kind
(including any undertaking, agreement or instrument that would constitute
Indebtedness), (b) is directly or indirectly liable (as a guarantor or
otherwise), or (c) constitutes the lender; and (ii) no default with respect to
which (including any rights that the holders thereof may have to take
enforcement action against an Unrestricted Subsidiary) would permit (upon
notice, lapse of time or both) any holder of any other Indebtedness (other than
the Notes being offered hereby) of the Company or any of its Restricted
Subsidiaries to declare a default on such other Indebtedness or cause the
payment thereof to be accelerated or payable prior to its stated maturity; and
(iii) as to which the lenders have been notified in writing that they will not
have any recourse to the stock or assets of the Company or any of its Restricted
Subsidiaries.

      "Non-U.S.  Person" means a Person who is not a U.S.  Person.

      "Notes" has the meaning assigned to it in the preamble to this Indenture.
The Initial Notes and the Additional Notes shall be treated as a single class
for all purposes under this Indenture.

      "Obligations" means any principal, interest, penalties, fees,
indemnifications, costs, expenses, reimbursement obligations, damages and other
liabilities and obligations which may arise under or in connection with the New
Credit Facility or the New Bonding Agreement or under or in connection with the
documentation governing any Indebtedness, and in all cases whether direct or
indirect, absolute or contingent, now outstanding or hereafter created, assumed
or incurred and including, without limitation, interest accruing subsequent to
the filing of a petition in bankruptcy or the commencement of any insolvency,
reorganization or similar proceedings at the rate provided in the relevant
document, whether or not an allowed claim, and any obligation to redeem or
defease any of the foregoing.

      "Offering" means the offering of the Notes by the Company.

      "Officer" means, with respect to any Person, the Chairman of the Board,
the Chief Executive Officer, the President, the Chief Operating Officer, the
Chief Financial Officer, the Treasurer, any Assistant Treasurer, the Controller,
the Secretary or any Vice-President of such Person.

      "Officers' Certificate" means a certificate signed on behalf of the
Company by two Officers of the Company, one of whom must be the principal
executive officer, the principal financial officer, the treasurer or the
principal accounting officer of the Company, that meets the requirements of
Section 12.05 hereof.

      "Opinion of Counsel" means an opinion from legal counsel who is reasonably
acceptable to the Trustee, that meets the requirements of Section 12.05 hereof.
The counsel may be an employee of or counsel to the Company, any Subsidiary of
the Company or the Trustee.

      "Participant" means, with respect to the Depositary, Euroclear or Cedel, a
Person who has an account with the Depositary, Euroclear or Cedel, respectively
(and, with respect to DTC, shall include Euroclear and Cedel).

                                       11

 
      "Permitted Bonding Obligations" means (i) obligations incurred by the
Company or any of its Subsidiaries (including Guarantees) with respect to bid,
performance, surety, appeal or similar bonds and completion guarantees in the
ordinary course of business and consistent with past practices and (ii)
obligations incurred by the Company or any of its Subsidiaries (including
Guarantees) under the New Bonding Agreement.

      "Permitted Business" means any of the businesses engaged in by the Company
and its Restricted Subsidiaries on the date of this Indenture and any other
business reasonably related, complementary or ancillary thereto.

      "Permitted Investments" means (a) any Investment in the Company or in a
Restricted Subsidiary of the Company that is a Subsidiary Guarantor and is
engaged in a Permitted Business; (b) any Investment in Cash Equivalents; (c) any
Investment by the Company or any Restricted Subsidiary of the Company in a
Person, if as a result of such Investment (i) such Person becomes a Restricted
Subsidiary of the Company and a Subsidiary Guarantor and is engaged in a
Permitted Business or (ii) such Person is merged, consolidated or amalgamated
with or into, or transfers or conveys substantially all of its assets to, or is
liquidated into, the Company or a Restricted Subsidiary of the Company that is a
Subsidiary Guarantor and that is engaged in Permitted Business; (d) any
Investment made as a result of the receipt of assets not constituting Cash
Equivalents from an Asset Sale that was made pursuant to and in compliance with
Section 4.10 hereof; (e) any acquisition of assets solely in exchange for the
issuance of Equity Interests (other than Disqualified Stock) of the Company; (f)
other Investments in any Person having an aggregate fair market value (measured
on the date each such Investment was made and without giving effect to
subsequent changes in value), when taken together with all other Investments
made pursuant to this clause (f) that are at the time outstanding, not to exceed
$10.0 million; (g) Investments in securities of customers received in settlement
of obligations or pursuant to a plan of reorganization or similar arrangement
upon the bankruptcy or insolvency of such trade creditors or customers; (h)
Investments existing on the date of this Indenture; (i) loans and advances to
officers, directors, members and employees for business-related travel expenses,
moving expenses and other similar expenses, in each case, incurred in the
ordinary course of business and consistent with past practices not to exceed
$1.0 million in the aggregate at any time; (j) any Hedging Obligation; (k)
Investments consisting of intercompany loans from the Company and its Restricted
Subsidiaries to Restricted Subsidiaries, including Restricted Subsidiaries that
are not Subsidiary Guarantors; (l) Investments consisting of capital
contributions from the Company or any Restricted Subsidiaries to Restricted
Subsidiaries that are not Subsidiary Guarantors in an aggregate amount at any
one time outstanding not to exceed $10.0 million; and (m) Investments in joint
ventures formed in the ordinary course of business for the purpose of bidding
and completing specific projects within a Permitted Business in an aggregate
amount at any one time outstanding not to exceed $5.0 million.

      "Permitted Junior Securities" means Equity Interests in the Company or any
Subsidiary Guarantor or debt securities that are subordinated to all Senior Debt
(and any debt securities issued in exchange for Senior Debt) to substantially
the same extent as, or to a greater extent than, the Notes are subordinated to
Senior Debt pursuant to this Indenture; provided that no such Equity Interests
or debt securities may be issued if the rights of the holders of the Senior Debt
are impaired by any such issuance in connection with a reorganization,
including, without limitation, by reason of such rights being impaired within
the meaning of Section 1124 of Title 11 of the United States Code.

                                       12

 
      "Permitted Liens" means (i) Liens on assets of the Company securing Senior
Debt of the Company and Liens on assets of Subsidiary Guarantors securing Senior
Debt, provided, in each case, that such Indebtedness was permitted by the terms
of this Indenture to be incurred; (ii) Liens in favor of the Company or a
Subsidiary Guarantor; (iii) Liens on property of a Person existing at the time
such Person is merged with or into or consolidated with the Company or any
Restricted Subsidiary of the Company; provided that such Liens were in existence
prior to the contemplation of such merger or consolidation and do not extend to
any assets other than those of the Person merged into or consolidated with the
Company; (iv) Liens on property existing at the time of acquisition thereof by
the Company or any Restricted Subsidiary of the Company, provided that such
Liens were in existence prior to the contemplation of such acquisition; (v)
Liens to secure the performance of statutory obligations, surety or appeal
bonds, bid bonds, payment bonds, performance and lien bonds or other obligations
of a like nature incurred in the ordinary course of business; (vi) Liens to
secure Indebtedness (including Capital Lease Obligations) permitted by clause
(v) or (ix) of the second paragraph of Section 4.09 hereof covering, in the case
of such clause (v), only the assets acquired with such Indebtedness; (vii) Liens
existing on the date of this Indenture; (viii) Liens for taxes, assessments or
governmental charges or claims that are not yet delinquent or that are being
contested in good faith by appropriate proceedings promptly instituted and
diligently concluded, provided that any reserve or other appropriate provision
as shall be required in conformity with GAAP shall have been made therefor; (ix)
Liens on assets of Unrestricted Subsidiaries that secure Non-Recourse Debt of
Unrestricted Subsidiaries; (x) Liens incurred in the ordinary course of business
of the Company or any Restricted Subsidiary of the Company with respect to
obligations that do not exceed $7.5 million at any one time outstanding and that
(a) are not incurred in connection with the borrowing of money or the obtaining
of advances or credit (other than trade credit in the ordinary course of
business) and (b) do not in the aggregate materially detract from the value of
the property or materially impair the use thereof in the operation of business
by the Company or such Restricted Subsidiary; (xi) statutory Liens of landlords
and Liens of carriers, warehousemen, mechanics, suppliers, materialmen,
repairmen and other Liens (including statutory maritime Liens) imposed by law
incurred in the ordinary course of business; (xii) Liens incurred or deposits
made in the ordinary course of business in connection with workers'
compensation, unemployment insurance and other types of social security or
similar obligations, or to secure the performance of tenders, statutory
obligations, surety and appeal bonds, bids, leases, government contracts,
performance and return-of-money bonds and other similar obligations (exclusive
of obligations for the payment of borrowed money); (xiii) judgment or attachment
Liens not giving rise to an Event of Default; (xiv) easements, rights-of-way,
zoning restrictions and other similar charges or encumbrances in respect of real
property not interfering in any material respect with the ordinary course of the
business of the Company or any of its Restricted Subsidiaries; (xv) any interest
or title of a lessor under any lease, whether or not characterized as capital or
operating; provided that such Liens do not extend to any property or assets
which is not leased property subject to such lease; (xvi) Liens securing Hedging
Obligations which Hedging Obligations relate to Indebtedness that is otherwise
permitted under this Indenture; (xvii) Liens securing reimbursement obligations
with respect to letters of credit and products and proceeds thereof; (xviii)
Liens securing Permitted Refinancing Indebtedness which is incurred to refinance
any Indebtedness which has been secured by a Lien permitted under this Indenture
and which has been incurred in accordance with the provisions hereof; (xix)
Liens in favor of the Company or any of its Restricted Subsidiaries securing
Indebtedness of any Restricted Subsidiary that is not a Subsidiary Guarantor;
(xx) Liens with respect to current wages of the master and crew and for wages of
a stevedore when employed directly by the Company or any Subsidiary of the
Company, or by the charterer, operator, master or agent of any of the vessels
owned or

                                       13

 
operated by the Company or any Subsidiary of the Company; and (xxi) Liens for
salvage (including contract salvage).

      "Permitted Refinancing Indebtedness" means any Indebtedness of the Company
or any of its Restricted Subsidiaries issued in exchange for, to extend,
refinance, renew, replace, defease or refund other Indebtedness of the Company
or any of its Restricted Subsidiaries (other than intercompany Indebtedness);
provided that: (i) the principal amount (or accreted value, if applicable) of
such Permitted Refinancing Indebtedness does not exceed the principal amount of
(or accreted value, if applicable), plus accrued interest on, the Indebtedness
so extended, refinanced, renewed, replaced, defeased or refunded (plus the
amount of reasonable expenses, premiums, penalties, fees and interest incurred
in connection therewith); (ii) such Permitted Refinancing Indebtedness has a
final maturity date later than the final maturity date of, and has a Weighted
Average Life to Maturity equal to or greater than the Weighted Average Life to
Maturity of, the Indebtedness being extended, refinanced, renewed, replaced,
defeased or refunded; (iii) if the Indebtedness being extended, refinanced,
renewed, replaced, defeased or refunded is subordinated in right of payment to
the Notes, such Permitted Refinancing Indebtedness has a final maturity date
later than the final maturity date of, and is subordinated in right of payment
to, the Notes on terms at least as favorable to the Holders of Notes as those
contained in the documentation governing the Indebtedness being extended,
refinanced, renewed, replaced, defeased or refunded; and (iv) such Indebtedness
is incurred either by the Company or by the Restricted Subsidiary who is the
obligor on the Indebtedness being extended, refinanced, renewed, replaced,
defeased or refunded.

      "Person" means any individual, corporation, partnership, joint venture,
association, joint-stock company, trust, unincorporated organization or
government or agency or political subdivision thereof.

      "Principals" means (i) CVC and the Management Investors and (ii) any
Related Party of a Person referred to in clause (i).

      "Private Placement Legend" means the legend set forth in Section
2.06(g)(i) to be placed on all Notes issued under this Indenture except where
otherwise permitted by the provisions of this Indenture.

      "Public Equity Offering" means a public offering pursuant to an effective
registration statement under the Securities Act of Equity Interests (other than
Disqualified Stock) of the Company.

      "QIB" means a "qualified institutional buyer" as defined in Rule 144A.

      "Qualified Proceeds" means any of the following or any combination of the
following: (i) cash, (ii) Cash Equivalents, (iii) assets that are used or useful
in a Permitted Business and (iv) the Capital Stock of any Person engaged in a
Permitted Business if, in connection with the receipt by the Company or any
Restricted Subsidiary of the Company of such Capital Stock, (a) such Person
becomes a Restricted Subsidiary of the Company or any Restricted Subsidiary of
the Company or (b) such Person is merged, consolidated or amalgamated with or
into, or transfers or conveys substantially all of its assets to, or is
liquidated into, the Company or any Restricted Subsidiary of the Company.

                                       14

 
      "Recapitalization" means the recapitalization of the Company pursuant to
the Merger Agreement.

      "Registration Rights Agreement" means the Registration Rights Agreement,
dated as of August 19, 1998, by and among the Company and the other parties
named on the signature pages thereof, as such agreement may be amended, modified
or supplemented from time to time, and, with respect to any Additional Notes,
one or more registration rights agreements between the Company and the other
parties thereto, as such agreement(s) may be amended, modified or supplemented
from time to time, relating to rights given by the Company to the purchasers of
Additional Notes to register such Additional Notes under the Securities Act.

      "Regulation S" means Regulation S promulgated under the Securities Act.

      "Regulation S Global Note" means a Regulation S Temporary Global Note or
Regulation S Permanent Global Note, as appropriate.

      "Regulation S Permanent Global Note" means a permanent global Note in the
form of Exhibit A1 hereto bearing the Global Note Legend and the Private
Placement Legend and deposited with or on behalf of and registered in the name
of the Depositary or its nominee, issued in a denomination equal to the
outstanding principal amount of the Regulation S Temporary Global Note upon
expiration of the Restricted Period.

      "Regulation S Temporary Global Note" means a temporary global Note in the
form of Exhibit A2 hereto bearing the Private Placement Legend and deposited
with or on behalf of and registered in the name of the Depositary or its
nominee, issued in a denomination equal to the outstanding principal amount of
the Notes initially sold in reliance on Rule 903 of Regulation S.

      "Related Party" means (a) with respect to CVC (i) Citicorp, any direct or
indirect wholly owned subsidiary of Citicorp, and any officer, director or
employee of CVC, Citicorp or any wholly owned subsidiary of Citicorp, (ii) any
spouse or lineal descendant (including by adoption and stepchildren) of the
officers, directors and employees referred to in clause (a) (i) above, (iii) any
trust, corporation or partnership 100%-in-interest of the beneficiaries,
stockholders or partners of which consists of one or more of the persons
described in clause (a) (i) or (ii) above or (iv) Vectura, so long as CVC or any
of its Related Parties described in (i), (ii) or (iii) above holds at least 50%
of the Great Lakes membership interests in Vectura; and (b) with respect to any
officer or employee of the Company or a Subsidiary of the Company (i) any spouse
or lineal descendant (including by adoption and stepchildren) of such officer or
employee and (ii) any trust, corporation or partnership 100%-in-interest of the
beneficiaries, stockholders or partners of which consists of such officer or
employee, any of the persons described in clause (b) (i) above or any
combination thereof.

      "Representative" means the indenture trustee or other trustee, agent or
representative for any Senior Debt.

      "Responsible Officer," when used with respect to the Trustee, means any
officer within the Corporate Trust Administration of the Trustee (or any
successor group of the Trustee) or any other

                                       15

 
officer of the Trustee customarily performing functions similar to those
performed by any of the above designated officers and also means, with respect
to a particular corporate trust matter, any other officer to whom such matter is
referred because of his knowledge of and familiarity with the particular
subject.

      "Restricted Definitive Note" means a Definitive Note bearing the Private
Placement Legend.

      "Restricted Global Note" means a Global Note bearing the Private Placement
Legend.

      "Restricted Investment" means an Investment other than a Permitted
Investment.

      "Restricted Period" means the 40-day restricted period as defined in
Regulation S.

      "Restricted Subsidiary" of a Person means any Subsidiary of the referent
Person that is not an Unrestricted Subsidiary.

      "Rule 144" means Rule 144 promulgated under the Securities Act.

      "Rule 144A" means Rule 144A promulgated under the Securities Act.

      "Rule 903" means Rule 903 promulgated under the Securities Act.

      "Rule 904" means Rule 904 promulgated the Securities Act.

      "SEC" means the Securities and Exchange Commission.

      "Securities Act" means the Securities Act of 1933, as amended.

      "Senior Debt" means (i) all Obligations of the Company or a Subsidiary
Guarantor outstanding under the New Credit Facility, including any Guarantee
thereof and all Hedging Obligations with respect thereto and all interest and
fees accrued with respect thereto following the commencement of a proceeding
under bankruptcy law, whether or not considered an allowed claim in such
proceeding, (ii) all Permitted Bonding Obligations from time to time
outstanding, (iii) any other Indebtedness of the Company or a Subsidiary
Guarantor permitted to be incurred under the terms of this Indenture, unless the
instrument under which such Indebtedness is incurred expressly provides that it
is on a parity with or subordinated in right of payment to the Notes and (iv)
all Obligations with respect to the foregoing.  Notwithstanding anything to the
contrary in the foregoing, Senior Debt shall not include (v) any liability for
federal, state, local or other taxes owed or owing, (w) any Indebtedness of the
Company or any Subsidiary Guarantor to any Subsidiary of the Company or any
other Affiliates of the Company, (x) any trade payables, (y) any Indebtedness
which is expressly subordinated to any other Indebtedness of the Company or any
of its Subsidiaries, or (z) any Indebtedness that is incurred in violation of
this Indenture.

      "Shelf Registration Statement" means the Shelf Registration Statement as
defined in the Registration Rights Agreement.

                                       16

 
      "Significant Subsidiary" means any Subsidiary that would be a "significant
subsidiary" as defined in Article 1, Rule 1-02 of Regulation S-X, promulgated
pursuant to the Act, as such Regulation is in effect on the date hereof.

      "Stated Maturity" means, with respect to any installment of interest or
principal (including any sinking fund payment) on any series of Indebtedness,
the date on which such payment of interest or principal was scheduled to be paid
in the original documentation governing such Indebtedness, and shall not include
any contingent obligations to repay, redeem or repurchase any such interest or
principal prior to the date originally scheduled for the payment thereof.

      "Stockholders' Agreement" means the Securities Purchase and Holders
Agreement among the stockholders of the Company, as in effect on the date of
this Indenture.

      "Subsidiary" means, with respect to any Person, (i) any corporation,
association or other business entity of which more than 50% of the total voting
power of shares of Capital Stock entitled (without regard to the occurrence of
any contingency) to vote in the election of directors, managers or trustees
thereof is at the time owned or controlled, directly or indirectly, by such
Person or one or more of the other Subsidiaries of that Person (or a combination
thereof) and (ii) any partnership (a) the sole general partner or the managing
general partner of which is such Person or a Subsidiary of such Person or (b)
the only general partners of which are such Person or of one or more
Subsidiaries of such Person (or any combination thereof).

      "Subsidiary Guarantee" means a guarantee (other than by endorsement of
negotiable instruments for collection in the ordinary course of business),
direct or indirect, in any manner (including, without limitation, by way of a
pledge of assets or through letters of credit or reimbursement agreements in
respect thereof), of all or any part of any Indebtedness.

      "Subsidiary Guarantors" means each of (i) the wholly owned domestic
Restricted Subsidiaries of the Company on the date of this Indenture and (ii)
any other subsidiary that executes a Subsidiary Guarantee in accordance with the
provisions hereof, and their respective successors and assigns.

      "Sureties" means Reliance Insurance Company, United Pacific Insurance
Company, Reliance National Insurance Company and Reliance Surety Company,
together with any of their respective Affiliates.

      "TIA" means the Trust Indenture Act of 1939 (15 U.S.C.  (S)(S) 77aaa-
77bbbb) as in effect on the date on which this Indenture is qualified under the
TIA.

      "Transaction" means the Recapitalization and the funding thereof pursuant
to the issuance of capital stock by the Company to Vectura and the Management
Investors, borrowings by the Company under the New Credit Facility and
consummation of the Offering.

      "Trustee" means the party named as such above until a successor replaces
it in accordance with the applicable provisions of this Indenture and thereafter
means the successor serving hereunder.

                                       17

 
      "Unrestricted Global Note" means a permanent global Note substantially in
the form of Exhibit A1 attached hereto that bears the Global Note Legend and
that has the "Schedule of Exchanges of Interests in the Global Note" attached
thereto, and that is deposited with or on behalf of and registered in the name
of the Depositary, representing a series of Notes that do not bear the Private
Placement Legend.

      "Unrestricted Definitive Note" means one or more Definitive Notes that do
not bear and are not required to bear the Private Placement Legend.

      "Unrestricted Subsidiary" means (i) any Subsidiary of the Company (or any
successor to any of them) that is designated by the Board of Directors of the
Company as an Unrestricted Subsidiary pursuant to a board resolution; but only
to the extent that such Subsidiary: (a) has no Indebtedness other than Non-
Recourse Debt; (b) is not party to any agreement, contract, arrangement or
understanding with the Company or any Restricted Subsidiary of the Company
unless the terms of any such agreement, contract, arrangement or understanding
are no less favorable to the Company or such Restricted Subsidiary than those
that might be obtained at the time from Persons who are not Affiliates of the
Company; (c) is a Person with respect to which neither the Company nor any of
its Restricted Subsidiaries has any direct or indirect obligation (x) to
subscribe for additional Equity Interests or (y) to maintain or preserve such
Person's financial condition or to cause such Person to achieve any specified
levels of operating results; (d) has not guaranteed or otherwise directly or
indirectly provided credit support for any Indebtedness of the Company or any of
its Restricted Subsidiaries; and (e) has at least one director on its board of
directors that is not a director or executive officer of the Company or any of
its Restricted Subsidiaries and has at least one executive officer that is not a
director or executive officer of the Company or any of its Restricted
Subsidiaries. Any such designation by the Board of Directors shall be evidenced
to the Trustee by filing with the Trustee a certified copy of the Board
Resolution giving effect to such designation and an Officers' Certificate
certifying that such designation complied with the foregoing conditions and was
permitted by Section 4.07 hereof. If, at any time, any Unrestricted Subsidiary
would fail to meet the foregoing requirements as an Unrestricted Subsidiary, it
shall thereafter cease to be an Unrestricted Subsidiary for purposes of this
Indenture and any Indebtedness of such Subsidiary shall be deemed to be incurred
by a Restricted Subsidiary of the Company as of such date (and, if such
Indebtedness is not permitted to be incurred as of such date under Section 4.09
hereof, the Company shall be in default of such covenant). The Board of
Directors of the Company may at any time designate any Unrestricted Subsidiary
to be a Restricted Subsidiary; provided that such designation shall be deemed to
be an incurrence of Indebtedness by a Restricted Subsidiary of the Company of
any outstanding Indebtedness of such Unrestricted Subsidiary and such
designation shall only be permitted if (i) such Indebtedness is permitted under
Section 4.09 hereof, calculated on a pro forma basis as if such designation had
occurred at the beginning of the four-quarter reference period, and (ii) no
Default or Event of Default would be in existence following such designation.

      "U.S. Person" means a U.S.  person as defined in Rule 902(o) under the
Securities Act.

      "Vectura" means Vectura Holdings, LLC, a Delaware limited liability
company, or any successor thereto by merger or consolidation.

                                       18

 
      "Voting Stock" of any Person as of any date means the Capital Stock of
such Person that is at the time entitled to vote in the election of the Board of
Directors of such Person.

      "Weighted Average Life to Maturity" means, when applied to any
Indebtedness at any date, the number of years obtained by dividing (i) the sum
of the products obtained by multiplying (a) the amount of each then remaining
installment, sinking fund, serial maturity or other required payments of
principal, including payment at final maturity, in respect thereof, by (b) the
number of years (calculated to the nearest one-twelfth) that will elapse between
such date and the making of such payment, by (ii) the then outstanding principal
amount of such Indebtedness.

      "Wholly Owned Restricted Subsidiary" of any Person means a Restricted
Subsidiary of such Person all of the outstanding Capital Stock or other
ownership interests of which (other than directors' qualifying shares) shall at
the time be owned by such Person or by one or more Wholly Owned Restricted
Subsidiaries of such Person and one or more Wholly Owned Restricted Subsidiaries
of such Person.

Section 1.02.  Other Definitions.


                                                                    Defined in  
    Term                                                              Section   
    -----                                                             -------   
    "Affiliate Transaction"........................................    4.11     
    "Asset Sale Offer".............................................    3.09     
    "Authentication Order".........................................    2.02     
    "Change of Control Offer"......................................    4.15     
    "Change of Control Payment"....................................    4.15     
    "Change of Control Payment Date"...............................    4.15     
    "Covenant Defeasance"..........................................    8.03     
    "DTC"...........................................................   2.03     
    "Event of Default"..............................................   6.01     
    "Excess Proceeds"...............................................   4.10     
    "incur".........................................................   4.09     
    "Legal Defeasance"..............................................   8.02     
    "Offer Amount"..................................................   3.09     
    "Offer Period"..................................................   3.09     
    "Paying Agent"..................................................   2.03     
    "Payment Blockage Notice".......................................  10.03    
    "Payment Default"...............................................   6.01     
    "Permitted Debt"................................................   4.09     
    "Purchase Date".................................................   3.09     
    "Registrar".....................................................   2.03     
    "Restricted Payments"..........................................    4.07 

Section 1.03.  Incorporation by Reference of Trust Indenture Act.

      Whenever this Indenture refers to a provision of the TIA, the provision is
incorporated by reference in and made a part of this Indenture.

                                       19

 
      The following TIA terms used in this Indenture have the following
meanings:

      "indenture securities" means the Notes;

      "indenture security Holder" means a Holder of a Note;

      "indenture to be qualified" means this Indenture;

      "indenture trustee" or "institutional trustee" means the Trustee; and

      "obligor" on the Notes and the Subsidiary Guarantees means the Company and
the Subsidiary Guarantors, respectively, and any successor obligor upon the
Notes and the Subsidiary Guarantees, respectively.

      All other terms used in this Indenture that are defined by the TIA,
defined by TIA reference to another statute or defined by SEC rule under the TIA
have the meanings so assigned to them.

Section 1.04.  Rules of Construction.

      Unless the context otherwise requires:

      (a) a term has the meaning assigned to it;

      (b) an accounting term not otherwise defined has the meaning assigned to
it in accordance with GAAP;

      (c)  "or" is not exclusive;

      (d) words in the singular include the plural, and in the plural include
the singular;

      (e) provisions apply to successive events and transactions;

      (f) references to sections of or rules under the Securities Act shall be
deemed to include substitute, replacement of successor sections or rules adopted
by the SEC from time to time; and

      (g) the word "including" means "including without limitation."

                                   ARTICLE 2
                                   THE NOTES

Section 2.01.  Form and Dating.

      (a) General.  The Notes and the Trustee's certificate of authentication
shall be substantially in the form of Exhibit A hereto.  The Notes may have
notations, legends or endorsements required by

                                       20

 
law, stock exchange rule or usage. Each Note shall be dated the date of its
authentication. The Notes shall be in denominations of $1,000 and integral
multiples thereof.

     The terms and provisions contained in the Notes shall constitute, and are
hereby expressly made, a part of this Indenture and the Company, the Subsidiary
Guarantors and the Trustee, by their execution and delivery of this Indenture,
expressly agree to such terms and provisions and to be bound thereby.  However,
to the extent any provision of any Note conflicts with the express provisions of
this Indenture, the provisions of this Indenture shall govern and be
controlling.

     (b) Global Notes.  Notes issued in global form shall be substantially in
the form of Exhibits A1 or A2 attached hereto (including the Global Note Legend
thereon and the "Schedule of Exchanges of Interests in the Global Note" attached
thereto).  Notes issued in definitive form shall be substantially in the form of
Exhibit A1 attached hereto (but without the Global Note Legend thereon and
without the "Schedule of Exchanges of Interests in the Global Note" attached
thereto).  Each Global Note shall represent such of the outstanding Notes as
shall be specified therein and each shall provide that it shall represent the
aggregate principal amount of outstanding Notes from time to time endorsed
thereon and that the aggregate principal amount of outstanding Notes represented
thereby may from time to time be reduced or increased, as appropriate, to
reflect exchanges and redemptions.  Any endorsement of a Global Note to reflect
the amount of any increase or decrease in the aggregate principal amount of
outstanding Notes represented thereby shall be made by the Trustee or the
Custodian, at the direction of the Trustee, in accordance with instructions
given by the Holder thereof as required by Section 2.06 hereof.

     (c) Temporary Global Notes.  Notes offered and sold in reliance on
Regulation S shall be issued initially in the form of the Regulation S Temporary
Global Note, which shall be deposited on behalf of the purchasers of the Notes
represented thereby with the Trustee, at its New York office, as custodian for
the Depositary, and registered in the name of the Depositary or the nominee of
the Depositary for the accounts of designated agents holding on behalf of
Euroclear or Cedel Bank, duly executed by the Company and authenticated by the
Trustee as hereinafter provided.  The Restricted Period shall be terminated upon
the receipt by the Trustee of (i) a written certificate from the Depositary,
together with copies of certificates from Euroclear and Cedel Bank certifying
that they have received certification of non-United States beneficial ownership
of 100% of the aggregate principal amount of the Regulation S Temporary Global
Note (except to the extent of any beneficial owners thereof who acquired an
interest therein during the Restricted Period pursuant to another exemption from
registration under the Securities Act and who will take delivery of a beneficial
ownership interest in a 144A Global Note bearing a Private Placement Legend, all
as contemplated by Section 2.06(a)(ii) hereof), and (ii) an Officers'
Certificate from the Company.  Following the termination of the Restricted
Period, beneficial interests in the Regulation S Temporary Global Note shall be
exchanged for beneficial interests in Regulation S Permanent Global Notes
pursuant to the Applicable Procedures.  Simultaneously with the authentication
of Regulation S Permanent Global Notes, the Trustee shall cancel the Regulation
S Temporary Global Note.  The aggregate principal amount of the Regulation S
Temporary Global Note and the Regulation S Permanent Global Notes may from time
to time be increased or decreased by adjustments made on the records of the
Trustee and the Depositary or its nominee, as the case may be, in connection
with transfers of interest as hereinafter provided.

                                       21

 
     (d) Euroclear and Cedel Procedures Applicable.  The provisions of the
"Operating Procedures of the Euroclear System" and "Terms and Conditions
Governing Use of Euroclear" and the "General Terms and Conditions of Cedel Bank"
and "Customer Handbook" of Cedel Bank shall be applicable to transfers of
beneficial interests in the Regulation S Temporary Global Note and the
Regulation S Permanent Global Notes that are held by Participants through
Euroclear or Cedel Bank.

Section 2.02.  Execution and Authentication.

     One Officer shall sign the Notes for the Company by manual or facsimile
signature.

     If the Officer whose signature is on a Note no longer holds that office at
the time a Note is authenticated, the Note shall nevertheless be valid.

     A Note shall not be valid until authenticated by the manual signature of
the Trustee.  The signature shall be conclusive evidence that the Note has been
authenticated under this Indenture.

     The Trustee shall, upon a written order of the Company signed by one
Officer (an "Authentication Order"), authenticate Notes for original issue up to
the aggregate principal amount stated in paragraph 4 of the Notes.  The
aggregate principal amount of Notes outstanding at any time may not exceed such
amount except as provided in Section 2.07 hereof.

     The Trustee may appoint an authenticating agent acceptable to the Company
to authenticate Notes.  An authenticating agent may authenticate Notes whenever
the Trustee may do so.  Each reference in this Indenture to authentication by
the Trustee includes authentication by such agent.  An authenticating agent has
the same rights as an Agent to deal with Holders or an Affiliate of the Company.

Section 2.03.  Registrar and Paying Agent.

     The Company shall maintain an office or agency where Notes may be
presented for registration of transfer or for exchange ("Registrar") and an
office or agency where Notes may be presented for payment ("Paying Agent").  The
Registrar shall keep a register of the Notes and of their transfer and exchange.
The Company may appoint one or more co-registrars and one or more additional
paying agents.  The term "Registrar" includes any co-registrar and the term
"Paying Agent" includes any additional paying agent.  The Company may change any
Paying Agent or Registrar without notice to any Holder.  The Company shall
notify the Trustee in writing of the name and address of any Agent not a party
to this Indenture.  If the Company fails to appoint or maintain another entity
as Registrar or Paying Agent, the Trustee shall act as such.  The Company or any
of its Restricted Subsidiaries may act as Paying Agent or Registrar.

     The Company initially appoints The Depository Trust Company ("DTC") to act
as Depositary with respect to the Global Notes.

     The Company initially appoints the Trustee to act as the Registrar and
Paying Agent and to act as Custodian with respect to the Global Notes.

                                       22

 
Section 2.04.  Paying Agent to Hold Money in Trust.

     The Company shall require each Paying Agent other than the Trustee to
agree in writing that the Paying Agent will hold in trust for the benefit of
Holders or the Trustee all money held by the Paying Agent for the payment of
principal, premium or Liquidated Damages, if any, or interest on the Notes, and
will notify the Trustee of any default by the Company in making any such
payment.  While any such default continues, the Trustee may require a Paying
Agent to pay all money held by it to the Trustee.  The Company at any time may
require a Paying Agent to pay all money held by it to the Trustee.  Upon payment
over to the Trustee, the Paying Agent (if other than the Company or a
Subsidiary) shall have no further liability for the money.  If the Company or a
Restricted Subsidiary acts as Paying Agent, it shall segregate and hold in a
separate trust fund for the benefit of the Holders all money held by it as
Paying Agent.  Upon any bankruptcy or reorganization proceedings relating to the
Company, the Trustee shall serve as Paying Agent for the Notes.

Section 2.05.  Holder Lists.

     The Trustee shall preserve in as current a form as is reasonably
practicable the most recent list available to it of the names and addresses of
all Holders and shall otherwise comply with TIA (S) 312(a).  If the Trustee is
not the Registrar, the Company shall furnish to the Trustee at least seven
Business Days before each interest payment date and at such other times as the
Trustee may request in writing, a list in such form and as of such date as the
Trustee may reasonably require of the names and addresses of the Holders of
Notes and the Company shall otherwise comply with TIA (S) 312(a).

Section 2.06.  Transfer and Exchange.

     (a) Transfer and Exchange of Global Notes.  A Global Note may not be
transferred as a whole except by the Depositary to a nominee of the Depositary,
by a nominee of the Depositary to the Depositary or to another nominee of the
Depositary, or by the Depositary or any such nominee to a successor Depositary
or a nominee of such successor Depositary.  All Global Notes will be exchanged
by the Company for Definitive Notes if (i) the Company delivers to the Trustee
notice from the Depositary that it is unwilling or unable to continue to act as
Depositary or that it is no longer a clearing agency registered under the
Exchange Act and, in either case, a successor Depositary is not appointed by the
Company within 120 days after the date of such notice from the Depositary or
(ii) the Company in its sole discretion determines that the Global Notes (in
whole but not in part) should be exchanged for Definitive Notes and delivers a
written notice to such effect to the Trustee; provided that in no event shall
the Regulation S Temporary Global Note be exchanged by the Company for
Definitive Notes prior to (x) the expiration of the Restricted Period and (y)
the receipt by the Registrar of any certificates required pursuant to Rule
903(c)(3)(ii)(B) under the Securities Act.  Upon the occurrence of either of the
preceding events in (i) or (ii) above, Definitive Notes shall be issued in such
names as the Depositary shall instruct the Trustee.  Global Notes also may be
exchanged or replaced, in whole or in part, as provided in Sections 2.07 and
2.10 hereof.  Every Note authenticated and delivered in exchange for, or in lieu
of, a Global Note or any portion thereof, pursuant to this Section 2.06 or
Section 2.07 or 2.10 hereof, shall be authenticated and delivered in the form
of, and shall be, a Global Note.  A Global Note may not be exchanged for another
Note other than as provided in this Section 2.06(a), however, beneficial

                                       23

 
interests in a Global Note may be transferred and exchanged as provided in
Section 2.06(b), (c) or (f) hereof.

     (b) Transfer and Exchange of Beneficial Interests in the Global Notes.
The transfer and exchange of beneficial interests in the Global Notes shall be
effected through the Depositary, in accordance with the provisions of this
Indenture and the Applicable Procedures.  Beneficial interests in the Restricted
Global Notes shall be subject to restrictions on transfer comparable to those
set forth herein to the extent required by the Securities Act.  Transfers of
beneficial interests in the Global Notes also shall require compliance with
either subparagraph (i) or (ii) below, as applicable, as well as one or more of
the other following subparagraphs, as applicable:

          (i)    Transfer of Beneficial Interests in the Same Global Note.
   Beneficial interests in any Restricted Global Note may be transferred to
   Persons who take delivery thereof in the form of a beneficial interest in the
   same Restricted Global Note in accordance with the transfer restrictions set
   forth in the Private Placement Legend; provided, however, that prior to the
   expiration of the Restricted Period, transfers of beneficial interests in the
   Temporary Regulation S Global Note may not be made to a U.S. Person or for
   the account or benefit of a U.S. Person (other than an Initial Purchaser).
   Beneficial interests in any Unrestricted Global Note may be transferred to
   Persons who take delivery thereof in the form of a beneficial interest in an
   Unrestricted Global Note. No written orders or instructions shall be required
   to be delivered to the Registrar to effect the transfers described in this
   Section 2.06(b)(i).

          (ii)   All Other Transfers and Exchanges of Beneficial Interests in
   Global Notes.  In connection with all transfers and exchanges of beneficial
   interests that are not subject to Section 2.06(b)(i) above, the transferor of
   such beneficial interest must deliver to the Registrar either (A) (1) a
   written order from a Participant or an Indirect Participant given to the
   Depositary in accordance with the Applicable Procedures directing the
   Depositary to credit or cause to be credited a beneficial interest in another
   Global Note in an amount equal to the beneficial interest to be transferred
   or exchanged and (2) instructions given in accordance with the Applicable
   Procedures containing information regarding the Participant account to be
   credited with such increase or (B) (1) a written order from a Participant or
   an Indirect Participant given to the Depositary in accordance with the
   Applicable Procedures directing the Depositary to cause to be issued a
   Definitive Note in an amount equal to the beneficial interest to be
   transferred or exchanged and (2) instructions given by the Depositary to the
   Registrar containing information regarding the Person in whose name such
   Definitive Note shall be registered to effect the transfer or exchange
   referred to in (1) above; provided that in no event shall Definitive Notes be
   issued upon the transfer or exchange of beneficial interests in the
   Regulation S Temporary Global Note prior to (x) the expiration of the
   Restricted Period and (y) the receipt by the Registrar of any certificates
   required pursuant to Rule 903 under the Securities Act.  Upon consummation of
   an Exchange Offer by the Company in accordance with Section 2.06(f) hereof,
   the requirements of this Section 2.06(b)(ii) shall be deemed to have been
   satisfied upon receipt by the Registrar of the instructions contained in the
   Letter of Transmittal delivered by the Holder of such beneficial interests in
   the Restricted Global Notes.  Upon satisfaction of all of the requirements
   for transfer or exchange of beneficial interests in Global Notes contained in
   this Indenture and the Notes or otherwise applicable under the Securities
   Act,

                                       24

 
   the Trustee shall adjust the principal amount of the relevant Global
   Note(s) pursuant to Section 2.06(h) hereof.

          (iii)  Transfer of Beneficial Interests to Another Restricted Global
   Note.  A beneficial interest in any Restricted Global Note may be transferred
   to a Person who takes delivery thereof in the form of a beneficial interest
   in another Restricted Global Note if the transfer complies with the
   requirements of Section 2.06(b)(ii) above and the Registrar receives the
   following:

                 (A) if the transferee will take delivery in the form of a
      beneficial interest in the 144A Global Note, then the transferor must
      deliver a certificate in the form of Exhibit B hereto, including the
      certifications in item (1) thereof; and

                 (B) if the transferee will take delivery in the form of a
      beneficial interest in the Regulation S Temporary Global Note or the
      Regulation S Global Note, then the transferor must deliver a certificate
      in the form of Exhibit B hereto, including the certifications in item (2)
      thereof.

          (iv)   Transfer and Exchange of Beneficial Interests in a Restricted
   Global Note for Beneficial Interests in the Unrestricted Global Note.  A
   beneficial interest in any Restricted Global Note may be exchanged by any
   holder thereof for a beneficial interest in an Unrestricted Global Note or
   transferred to a Person who takes delivery thereof in the form of a
   beneficial interest in an Unrestricted Global Note if the exchange or
   transfer complies with the requirements of Section 2.06(b)(ii) above and:

                 (A) such exchange or transfer is effected pursuant to the
      Exchange Offer in accordance with the Registration Rights Agreement and
      the holder of the beneficial interest to be transferred, in the case of an
      exchange, or the transferee, in the case of a transfer, certifies in the
      applicable Letter of Transmittal that it is not (1) a broker-dealer, (2) a
      Person participating in the distribution of the Exchange Notes or (3) a
      Person who is an affiliate (as defined in Rule 144) of the Company;

                 (B) such transfer is effected pursuant to the Shelf
      Registration Statement in accordance with the Registration Rights
      Agreement;

                 (C) such transfer is effected by a Broker-Dealer pursuant to
      the Exchange Offer Registration Statement in accordance with the
      Registration Rights Agreement; or

                 (D) the Registrar receives the following:

                     (1) if the holder of such beneficial interest in a
         Restricted Global Note proposes to exchange such beneficial interest
         for a beneficial interest in an Unrestricted Global Note, a certificate
         from such holder in the form of Exhibit C hereto, including the
         certifications in item (1)(a) thereof; or

                     (2) if the holder of such beneficial interest in a
         Restricted Global Note proposes to transfer such beneficial interest to
         a Person who shall take delivery thereof in

                                       25

 
          the form of a beneficial interest in an Unrestricted Global Note, a
          certificate from such holder in the form of Exhibit B hereto,
          including the certifications in item (4) thereof;

      and, in each such case set forth in this subparagraph (D), if the
      Registrar so requests or if the Applicable Procedures so require, an
      Opinion of Counsel in form reasonably acceptable to the Registrar to the
      effect that such exchange or transfer is in compliance with the Securities
      Act and that the restrictions on transfer contained herein and in the
      Private Placement Legend are no longer required in order to maintain
      compliance with the Securities Act.

          If any such transfer is effected pursuant to subparagraph (B) or (D)
   above at a time when an Unrestricted Global Note has not yet been issued, the
   Company shall issue and, upon receipt of an Authentication Order in
   accordance with Section 2.02 hereof, the Trustee shall authenticate one or
   more Unrestricted Global Notes in an aggregate principal amount equal to the
   aggregate principal amount of beneficial interests transferred pursuant to
   subparagraph (B) or (D) above.

          Beneficial interests in an Unrestricted Global Note cannot be
   exchanged for, or transferred to Persons who take delivery thereof in the
   form of, a beneficial interest in a Restricted Global Note.

     (c)  Transfer or Exchange of Beneficial Interests for Definitive Notes.

          (i) Beneficial Interests in Restricted Global Notes to Restricted
   Definitive Notes.  If any holder of a beneficial interest in a Restricted
   Global Note proposes to exchange such beneficial interest for a Restricted
   Definitive Note or to transfer such beneficial interest to a Person who takes
   delivery thereof in the form of a Restricted Definitive Note, then, upon
   receipt by the Registrar of the following documentation:

              (A) if the holder of such beneficial interest in a Restricted
      Global Note proposes to exchange such beneficial interest for a Restricted
      Definitive Note, a certificate from such holder in the form of Exhibit C
      hereto, including the certifications in item (2)(a) thereof;

              (B) if such beneficial interest is being transferred to a QIB in
      accordance with Rule 144A under the Securities Act, a certificate to the
      effect set forth in Exhibit B hereto, including the certifications in item
      (1) thereof;

              (C) if such beneficial interest is being transferred to a Non-U.S.
      Person in an offshore transaction in accordance with Rule 903 or Rule 904
      under the Securities Act, a certificate to the effect set forth in Exhibit
      B hereto, including the certifications in item (2) thereof;

              (D) if such beneficial interest is being transferred pursuant to
      an exemption from the registration requirements of the Securities Act in
      accordance with Rule 144 under the Securities Act, a certificate to the
      effect set forth in Exhibit B hereto, including the certifications in item
      (3)(a) thereof;

                                       26

 
              (E) if such beneficial interest is being transferred to an
      Institutional Accredited Investor in reliance on an exemption from the
      registration requirements of the Securities Act other than those listed in
      subparagraphs (B) through (D) above, a certificate to the effect set forth
      in Exhibit B hereto, including the certifications, certificates and
      Opinion of Counsel required by item (3) thereof, if applicable;

              (F) if such beneficial interest is being transferred to the
      Company or any of its Subsidiaries, a certificate to the effect set forth
      in Exhibit B hereto, including the certifications in item (3)(b) thereof;
      or

              (G) if such beneficial interest is being transferred pursuant to
      an effective registration statement under the Securities Act, a
      certificate to the effect set forth in Exhibit B hereto, including the
      certifications in item (3)(c) thereof,

the Trustee shall cause the aggregate principal amount of the applicable Global
Note to be reduced accordingly pursuant to Section 2.06(h) hereof, and the
Company shall execute and the Trustee shall authenticate and deliver to the
Person designated in the instructions a Definitive Note in the appropriate
principal amount. Any Definitive Note issued in exchange for a beneficial
interest in a Restricted Global Note pursuant to this Section 2.06(c) shall be
registered in such name or names and in such authorized denomination or
denominations as the holder of such beneficial interest shall instruct the
Registrar through instructions from the Depositary and the Participant or
Indirect Participant. The Trustee shall deliver such Definitive Notes to the
Persons in whose names such Notes are so registered. Any Definitive Note issued
in exchange for a beneficial interest in a Restricted Global Note pursuant to
this Section 2.06(c)(i) shall bear the Private Placement Legend and shall be
subject to all restrictions on transfer contained therein.

          (ii)   Beneficial Interests in Regulation S Temporary Global Note to
Definitive Notes. Notwithstanding Sections 2.06(c)(i)(A) and (C) hereof, a
beneficial interest in the Regulation S Temporary Global Note may not be
exchanged for a Definitive Note or transferred to a Person who takes delivery
thereof in the form of a Definitive Note prior to (x) the expiration of the
Restricted Period and (y) the receipt by the Registrar of any certificates
required pursuant to Rule 903(c)(3)(ii)(B) under the Securities Act, except in
the case of a transfer pursuant to an exemption from the registration
requirements of the Securities Act other than Rule 903 or Rule 904.

          (iii)  Beneficial Interests in Restricted Global Notes to Unrestricted
Definitive Notes. A holder of a beneficial interest in a Restricted Global Note
may exchange such beneficial interest for an Unrestricted Definitive Note or may
transfer such beneficial interest to a Person who takes delivery thereof in the
form of an Unrestricted Definitive Note only if:

                 (A) such exchange or transfer is effected pursuant to the
      Exchange Offer in accordance with the Registration Rights Agreement and
      the holder of such beneficial interest, in the case of an exchange, or the
      transferee, in the case of a transfer, certifies in the applicable Letter
      of Transmittal that it is not (1) a broker-dealer, (2) a Person
      participating in the distribution of the Exchange Notes or (3) a Person
      who is an affiliate (as defined in Rule 144) of the Company;

                                       27

 
                 (B) such transfer is effected pursuant to the Shelf
      Registration Statement in accordance with the Registration Rights
      Agreement;

                 (C) such transfer is effected by a Broker-Dealer pursuant to
      the Exchange Offer Registration Statement in accordance with the
      Registration Rights Agreement; or

                 (D) the Registrar receives the following:

                     (1) if the holder of such beneficial interest in a
         Restricted Global Note proposes to exchange such beneficial interest
         for a Definitive Note that does not bear the Private Placement Legend,
         a certificate from such holder in the form of Exhibit C hereto,
         including the certifications in item (1)(b) thereof; or

                      (2) if the holder of such beneficial interest in a
         Restricted Global Note proposes to transfer such beneficial interest to
         a Person who shall take delivery thereof in the form of a Definitive
         Note that does not bear the Private Placement Legend, a certificate
         from such holder in the form of Exhibit B hereto, including the
         certifications in item (4) thereof;

     and, in each such case set forth in this subparagraph (D), if the Registrar
     so requests or if the Applicable Procedures so require, an Opinion of
     Counsel in form reasonably acceptable to the Registrar to the effect that
     such exchange or transfer is in compliance with the Securities Act and that
     the restrictions on transfer contained herein and in the Private Placement
     Legend are no longer required in order to maintain compliance with the
     Securities Act.

          (iv) Beneficial Interests in Unrestricted Global Notes to Unrestricted
Definitive Notes. If any holder of a beneficial interest in an Unrestricted
Global Note proposes to exchange such beneficial interest for a Definitive Note
or to transfer such beneficial interest to a Person who takes delivery thereof
in the form of a Definitive Note, then, upon satisfaction of the conditions set
forth in Section 2.06(b)(ii) hereof, the Trustee shall cause the aggregate
principal amount of the applicable Global Note to be reduced accordingly
pursuant to Section 2.06(h) hereof, and the Company shall execute and the
Trustee shall authenticate and deliver to the Person designated in the
instructions a Definitive Note in the appropriate principal amount. Any
Definitive Note issued in exchange for a beneficial interest pursuant to this
Section 2.06(c)(iii) shall be registered in such name or names and in such
authorized denomination or denominations as the holder of such beneficial
interest shall instruct the Registrar through instructions from the Depositary
and the Participant or Indirect Participant. The Trustee shall deliver such
Definitive Notes to the Persons in whose names such Notes are so registered. Any
Definitive Note issued in exchange for a beneficial interest pursuant to this
Section 2.06(c)(iii) shall not bear the Private Placement Legend.

     (d)  Transfer and Exchange of Definitive Notes for Beneficial Interests in
Global Notes.

          (i) Restricted Definitive Notes to Beneficial Interests in Restricted
   Global Notes.  If any Holder of a Restricted Definitive Note proposes to
   exchange such Note for a beneficial interest in a Restricted Global Note or
   to transfer such Restricted Definitive Notes to a Person who takes

                                       28

 
delivery thereof in the form of a beneficial interest in a Restricted Global
Note, then, upon receipt by the Registrar of the following documentation:

            (A) if the Holder of such Restricted Definitive Note proposes to
      exchange such Note for a beneficial interest in a Restricted Global Note,
      a certificate from such Holder in the form of Exhibit C hereto, including
      the certifications in item (2)(b) thereof;

            (B) if such Restricted Definitive Note is being transferred to a QIB
      in accordance with Rule 144A under the Securities Act, a certificate to
      the effect set forth in Exhibit B hereto, including the certifications in
      item (1) thereof;

            (C) if such Restricted Definitive Note is being transferred to a
      Non-U.S.  Person in an offshore transaction in accordance with Rule 903 or
      Rule 904 under the Securities Act, a certificate to the effect set forth
      in Exhibit B hereto, including the certifications in item (2) thereof;

            (D) if such Restricted Definitive Note is being transferred pursuant
      to an exemption from the registration requirements of the Securities Act
      in accordance with Rule 144 under the Securities Act, a certificate to the
      effect set forth in Exhibit B hereto, including the certifications in item
      (3)(a) thereof;

            (E) if such Restricted Definitive Note is being transferred to an
      Institutional Accredited Investor in reliance on an exemption from the
      registration requirements of the Securities Act other than those listed in
      subparagraphs (B) through (D) above, a certificate to the effect set forth
      in Exhibit B hereto, including the certifications, certificates and
      Opinion of Counsel required by item (3) thereof, if applicable;

            (F) if such Restricted Definitive Note is being transferred to the
      Company or any of its Subsidiaries, a certificate to the effect set forth
      in Exhibit B hereto, including the certifications in item (3)(b) thereof;
      or

            (G) if such Restricted Definitive Note is being transferred pursuant
      to an effective registration statement under the Securities Act, a
      certificate to the effect set forth in Exhibit B hereto, including the
      certifications in item (3)(c) thereof,

the Trustee shall cancel the Restricted Definitive Note, increase or cause to be
increased the aggregate principal amount of, in the case of clause (A) above,
the appropriate Restricted Global Note, in the case of clause (B) above, the
144A Global Note, and in the case of clause (C) above, the Regulation S Global
Note.

          (ii) Restricted Definitive Notes to Beneficial Interests in
   Unrestricted Global Notes.  A Holder of a Restricted Definitive Note may
   exchange such Note for a beneficial interest in an Unrestricted Global Note
   or transfer such Restricted Definitive Note to a Person who takes delivery
   thereof in the form of a beneficial interest in an Unrestricted Global Note
   only if:

                                       29

 
            (A) such exchange or transfer is effected pursuant to the Exchange
      Offer in accordance with the Registration Rights Agreement and the Holder,
      in the case of an exchange, or the transferee, in the case of a transfer,
      certifies in the applicable Letter of Transmittal that it is not (1) a
      broker-dealer, (2) a Person participating in the distribution of the
      Exchange Notes or (3) a Person who is an affiliate (as defined in Rule
      144) of the Company;

            (B) such transfer is effected pursuant to the Shelf Registration
      Statement in accordance with the Registration Rights Agreement;

            (C) such transfer is effected by a Broker-Dealer pursuant to the
      Exchange Offer Registration Statement in accordance with the Registration
      Rights Agreement; or

            (D) the Registrar receives the following:

                (1) if the Holder of such Definitive Notes proposes to exchange
         such Notes for a beneficial interest in the Unrestricted Global Note, a
         certificate from such Holder in the form of Exhibit C hereto, including
         the certifications in item (1)(c) thereof; or

                (2) if the Holder of such Definitive Notes proposes to transfer
         such Notes to a Person who shall take delivery thereof in the form of a
         beneficial interest in the Unrestricted Global Note, a certificate from
         such Holder in the form of Exhibit B hereto, including the
         certifications in item (4) thereof;

     and, in each such case set forth in this subparagraph (D), if the Registrar
     so requests or if the Applicable Procedures so require, an Opinion of
     Counsel in form reasonably acceptable to the Registrar to the effect that
     such exchange or transfer is in compliance with the Securities Act and that
     the restrictions on transfer contained herein and in the Private Placement
     Legend are no longer required in order to maintain compliance with the
     Securities Act.

          Upon satisfaction of the conditions of any of the subparagraphs in
   this Section 2.06(d)(ii), the Trustee shall cancel the Definitive Notes and
   increase or cause to be increased the aggregate principal amount of the
   Unrestricted Global Note.

          (iii)  Unrestricted Definitive Notes to Beneficial Interests in
   Unrestricted Global Notes.  A Holder of an Unrestricted Definitive Note may
   exchange such Note for a beneficial interest in an Unrestricted Global Note
   or transfer such Definitive Notes to a Person who takes delivery thereof in
   the form of a beneficial interest in an Unrestricted Global Note at any time.
   Upon receipt of a request for such an exchange or transfer, the Trustee shall
   cancel the applicable Unrestricted Definitive Note and increase or cause to
   be increased the aggregate principal amount of one of the Unrestricted Global
   Notes.

          If any such exchange or transfer from a Definitive Note to a
     beneficial interest is effected pursuant to subparagraphs (ii)(B), (ii)(D)
     or (iii) above at a time when an Unrestricted Global Note has not yet been
     issued, the Company shall issue and, upon receipt of an Authentication
     Order in accordance with Section 2.02 hereof, the Trustee shall
     authenticate one or more Unrestricted Global

                                       30

 
     Notes in an aggregate principal amount equal to the principal amount of
   Definitive Notes so transferred.

     (e) Transfer and Exchange of Definitive Notes for Definitive Notes.  Upon
request by a Holder of Definitive Notes and such Holder's compliance with the
provisions of this Section 2.06(e), the Registrar shall register the transfer or
exchange of Definitive Notes.  Prior to such registration of transfer or
exchange, the requesting Holder shall present or surrender to the Registrar the
Definitive Notes duly endorsed or accompanied by a written instruction of
transfer in form satisfactory to the Registrar duly executed by such Holder or
by its attorney, duly authorized in writing.  In addition, the requesting Holder
shall provide any additional certifications, documents and information, as
applicable, required pursuant to the following provisions of this Section
2.06(e).

          (i) Restricted Definitive Notes to Restricted Definitive Notes.  Any
   Restricted Definitive Note may be transferred to and registered in the name
   of Persons who take delivery thereof in the form of a Restricted Definitive
   Note if the Registrar receives the following:

              (A) if the transfer will be made pursuant to Rule 144A under the
      Securities Act, then the transferor must deliver a certificate in the form
      of Exhibit B hereto, including the certifications in item (1) thereof;

              (B) if the transfer will be made pursuant to Rule 903 or Rule 904,
      then the transferor must deliver a certificate in the form of Exhibit B
      hereto, including the certifications in item (2) thereof; and

              (C) if the transfer will be made pursuant to any other exemption
      from the registration requirements of the Securities Act, then the
      transferor must deliver a certificate in the form of Exhibit B hereto,
      including the certifications, certificates and Opinion of Counsel required
      by item (3) thereof, if applicable.

          (ii) Restricted Definitive Notes to Unrestricted Definitive Notes. Any
   Restricted Definitive Note may be exchanged by the Holder thereof for an
   Unrestricted Definitive Note or transferred to a Person or Persons who take
   delivery thereof in the form of an Unrestricted Definitive Note if:

              (A) such exchange or transfer is effected pursuant to the
   Exchange Offer in accordance with the Registration Rights Agreement and the
   Holder, in the case of an exchange, or the transferee, in the case of a
   transfer, certifies in the applicable Letter of Transmittal that it is not
   (1) a broker-dealer, (2) a Person participating in the distribution of the
   Exchange Notes or (3) a Person who is an affiliate (as defined in Rule 144)
   of the Company;

              (B) any such transfer is effected pursuant to the Shelf
      Registration Statement in accordance with the Registration Rights
      Agreement;

              (C) any such transfer is effected by a Broker-Dealer pursuant to
      the Exchange Offer Registration Statement in accordance with the
      Registration Rights Agreement; or

                                       31

 
              (D) the Registrar receives the following:

                  (1) if the Holder of such Restricted Definitive Notes proposes
         to exchange such Notes for an Unrestricted Definitive Note, a
         certificate from such Holder in the form of Exhibit C hereto, including
         the certifications in item (1)(d) thereof; or

                  (2) if the Holder of such Restricted Definitive Notes proposes
         to transfer such Notes to a Person who shall take delivery thereof in
         the form of an Unrestricted Definitive Note, a certificate from such
         Holder in the form of Exhibit B hereto, including the certifications in
         item (4) thereof;

     and, in each such case set forth in this subparagraph (D), if the Registrar
     so requests, an Opinion of Counsel in form reasonably acceptable to the
     Company to the effect that such exchange or transfer is in compliance with
     the Securities Act and that the restrictions on transfer contained herein
     and in the Private Placement Legend are no longer required in order to
     maintain compliance with the Securities Act.

          (iii)  Unrestricted Definitive Notes to Unrestricted Definitive Notes.
   A Holder of Unrestricted Definitive Notes may transfer such Notes to a Person
   who takes delivery thereof in the form of an Unrestricted Definitive Note.
   Upon receipt of a request to register such a transfer, the Registrar shall
   register the Unrestricted Definitive Notes pursuant to the instructions from
   the Holder thereof.

     (f) Exchange Offer.  Upon the occurrence of the Exchange Offer in
accordance with the Registration Rights Agreement, the Company shall issue and,
upon receipt of an Authentication Order in accordance with Section 2.02, the
Trustee shall authenticate (i) one or more Unrestricted Global Notes in an
aggregate principal amount equal to the principal amount of the beneficial
interests in the Restricted Global Notes tendered for acceptance by Persons that
certify in the applicable Letters of Transmittal that (x) they are not broker-
dealers, (y) they are not participating in a distribution of the Exchange Notes
and (z) they are not affiliates (as defined in Rule 144) of the Company, and
accepted for exchange in the Exchange Offer and (ii) Definitive Notes in an
aggregate principal amount equal to the principal amount of the Restricted
Definitive Notes accepted for exchange in the Exchange Offer.  Concurrently with
the issuance of such Notes, the Trustee shall cause the aggregate principal
amount of the applicable Restricted Global Notes to be reduced accordingly, and
the Company shall execute and the Trustee shall authenticate and deliver to the
Persons designated by the Holders of Definitive Notes so accepted Definitive
Notes in the appropriate principal amount.

     (g) Legends.  The following legends shall appear on the face of all Global
Notes and Definitive Notes issued under this Indenture unless specifically
stated otherwise in the applicable provisions of this Indenture.

         (i)  Private Placement Legend.

                                       32

 
            (A) Except as permitted by subparagraph (B) below, each Global Note
      and each Definitive Note (and all Notes issued in exchange therefor or
      substitution thereof) shall bear the legend in substantially the following
      form:

"THE SECURITY (OR ITS PREDECESSOR) EVIDENCED HEREBY WAS ORIGINALLY ISSUED IN A
TRANSACTION EXEMPT FROM REGISTRATION UNDER SECTION 5 OF THE UNITED STATES
SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), AND THE SECURITY
EVIDENCED HEREBY MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED IN THE
ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION THEREFROM.  EACH
PURCHASER OF THE SECURITY EVIDENCED HEREBY IS HEREBY NOTIFIED THAT THE SELLER
MAY BE RELYING ON THE EXEMPTION FROM THE PROVISIONS OF SECTION 5 OF THE
SECURITIES ACT PROVIDED BY RULE 144A OR REGULATION S THEREUNDER.  THE HOLDER OF
THE SECURITY EVIDENCED HEREBY AGREES FOR THE BENEFIT OF THE COMPANY THAT (A)
SUCH SECURITY MAY BE RESOLD, PLEDGED OR OTHERWISE TRANSFERRED, ONLY (1)(a) IN
THE UNITED STATES TO A PERSON WHOM THE SELLER REASONABLY BELIEVES IS A QUALIFIED
INSTITUTIONAL BUYER (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) IN A
TRANSACTION MEETING THE REQUIREMENTS OF RULE 144A, (b) IN A TRANSACTION MEETING
THE REQUIREMENTS OF RULE 144 UNDER THE SECURITIES ACT, (c) OUTSIDE THE UNITED
STATES TO A NON U.S. PERSON IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE
904 UNDER THE SECURITIES ACT, (d) TO AN INSTITUTIONAL "ACCREDITED INVESTOR" AS
DEFINED IN RULE 501(A)(1), (2), (3) OR (7) OF THE SECURITIES ACT (AN
"INSTITUTIONAL ACCREDITED INVESTOR") THAT, PRIOR TO SUCH TRANSFER, FURNISHES THE
TRUSTEE A SIGNED LETTER CONTAINING CERTAIN REPRESENTATIONS AND AGREEMENTS (THE
FORM OF WHICH CAN BE OBTAINED FROM THE TRUSTEE) AND, IF SUCH TRANSFER IS IN
RESPECT OF AN AGGREGATE PRINCIPAL AMOUNT OF SECURITIES LESS THAN $250,000, AN
OPINION OF COUNSEL THAT SUCH TRANSFER IS IN COMPLIANCE WITH THE SECURITIES ACT
OR (e) IN ACCORDANCE WITH ANOTHER EXEMPTION FROM THE REGISTRATION REQUIREMENTS
OF THE SECURITIES ACT (AND BASED UPON AN OPINION OF COUNSEL IF THE COMPANY SO
REQUESTS), (2) TO THE COMPANY OR (3) PURSUANT TO AN EFFECTIVE REGISTRATION
STATEMENT AND, IN EACH CASE, IN ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS
OF ANY STATE OF THE UNITED STATES OR ANY OTHER APPLICABLE JURISDICTION AND (B)
THE HOLDER WILL, AND EACH SUBSEQUENT HOLDER IS REQUIRED TO, NOTIFY ANY PURCHASER
FROM IT OF THE SECURITY EVIDENCED HEREBY OF THE RESALE RESTRICTIONS SET FORTH IN
(A) ABOVE."

            (B) Notwithstanding the foregoing, any Global Note or Definitive
      Note issued pursuant to subparagraphs (b)(iv), (c)(iii), (c)(iv), (d)(ii),
      (d)(iii), (e)(ii), (e)(iii) or (f) to this Section 2.06 (and all Notes
      issued in exchange therefor or substitution thereof) shall not bear the
      Private Placement Legend.

          (ii) Global Note Legend.  Each Global Note shall bear a legend in
   substantially the following form:

                                       33

 
"THIS GLOBAL NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THE INDENTURE
GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE BENEFIT OF THE BENEFICIAL
OWNERS HEREOF, AND IS NOT TRANSFERABLE TO ANY PERSON UNDER ANY CIRCUMSTANCES
EXCEPT THAT (I) THE TRUSTEE MAY MAKE SUCH NOTATIONS HEREON AS MAY BE REQUIRED
PURSUANT TO SECTION 2.07 OF THE INDENTURE, (II) THIS GLOBAL NOTE MAY BE
EXCHANGED IN WHOLE BUT NOT IN PART PURSUANT TO SECTION 2.06(a) OF THE INDENTURE,
(III) THIS GLOBAL NOTE MAY BE DELIVERED TO THE TRUSTEE FOR CANCELLATION PURSUANT
TO SECTION 2.11 OF THE INDENTURE AND (IV) THIS GLOBAL NOTE MAY BE TRANSFERRED TO
A SUCCESSOR DEPOSITARY WITH THE PRIOR WRITTEN CONSENT OF THE COMPANY."

          (iii)  Regulation S Temporary Global Note Legend.  The Regulation S
   Temporary Global Note shall bear a legend in substantially the following
   form:

"THE RIGHTS ATTACHING TO THIS REGULATION S TEMPORARY GLOBAL NOTE, AND THE
CONDITIONS AND PROCEDURES GOVERNING ITS EXCHANGE FOR CERTIFICATED NOTES, ARE AS
SPECIFIED IN THE INDENTURE (AS DEFINED HEREIN).  NEITHER THE HOLDER NOR THE
BENEFICIAL OWNERS OF THIS REGULATION S TEMPORARY GLOBAL NOTE SHALL BE ENTITLED
TO RECEIVE PAYMENT OF INTEREST HEREON."

     (h) Cancellation and/or Adjustment of Global Notes.  At such time as all
beneficial interests in a particular Global Note have been exchanged for
Definitive Notes or a particular Global Note has been redeemed, repurchased or
canceled in whole and not in part, each such Global Note shall be returned to or
retained and canceled by the Trustee in accordance with Section 2.11 hereof.  At
any time prior to such cancellation, if any beneficial interest in a Global Note
is exchanged for or transferred to a Person who will take delivery thereof in
the form of a beneficial interest in another Global Note or for Definitive
Notes, the principal amount of Notes represented by such Global Note shall be
reduced accordingly and an endorsement shall be made on such Global Note by the
Trustee or by the Depositary at the direction of the Trustee to reflect such
reduction; and if the beneficial interest is being exchanged for or transferred
to a Person who will take delivery thereof in the form of a beneficial interest
in another Global Note, such other Global Note shall be increased accordingly
and an endorsement shall be made on such Global Note by the Trustee or by the
Depositary at the direction of the Trustee to reflect such increase.

     (i)  General Provisions Relating to Transfers and Exchanges.

          (i)    To permit registrations of transfers and exchanges, the Company
   shall execute and the Trustee shall authenticate Global Notes and Definitive
   Notes upon the Company's order or at the Registrar's request.

          (ii)   No service charge shall be made to a holder of a beneficial
   interest in a Global Note or to a Holder of a Definitive Note for any
   registration of transfer or exchange, but the Company may require payment of
   a sum sufficient to cover any transfer tax or similar governmental charge
   payable in connection therewith (other than any such transfer taxes or
   similar governmental charge payable upon exchange or transfer pursuant to
   Sections 2.10, 3.06, 3.09, 4.10, 4.15 and 9.05 hereof).

                                       34

 
          (iii)  The Registrar shall not be required to register the transfer of
   or exchange any Note selected for redemption in whole or in part, except the
   unredeemed portion of any Note being redeemed in part.

          (iv)   All Global Notes and Definitive Notes issued upon any
   registration of transfer or exchange of Global Notes or Definitive Notes
   shall be the valid obligations of the Company, evidencing the same debt, and
   entitled to the same benefits under this Indenture, as the Global Notes or
   Definitive Notes surrendered upon such registration of transfer or exchange.

          (v)    The Company shall not be required (A) to issue, to register the
   transfer of or to exchange any Notes during a period beginning at the opening
   of business 15 days before the day of any selection of Notes for redemption
   under Section 3.02 hereof and ending at the close of business on the day of
   selection, (B) to register the transfer of or to exchange any Note so
   selected for redemption in whole or in part, except the unredeemed portion of
   any Note being redeemed in part or (C) to register the transfer of or to
   exchange a Note between a record date and the next succeeding Interest
   Payment Date.

          (vi)   Prior to due presentment for the registration of a transfer of
   any Note, the Trustee, any Agent and the Company may deem and treat the
   Person in whose name any Note is registered as the absolute owner of such
   Note for the purpose of receiving payment of principal of and interest on
   such Notes and for all other purposes, and none of the Trustee, any Agent or
   the Company shall be affected by notice to the contrary.

          (vii)  The Trustee shall authenticate Global Notes and Definitive
   Notes in accordance with the provisions of Section 2.02 hereof.

          (viii) All certifications, certificates and Opinions of Counsel
   required to be submitted to the Registrar pursuant to this Section 2.06 to
   effect a registration of transfer or exchange may be submitted by facsimile.

Section 2.07.  Replacement Notes.

     If any mutilated Note is surrendered to the Trustee or the Company and the
Trustee receives evidence to its satisfaction of the destruction, loss or theft
of any Note, the Company shall issue and the Trustee, upon receipt of an
Authentication Order, shall authenticate a replacement Note if the Trustee's
requirements are met.  An indemnity bond must be supplied by the Holder that is
sufficient in the judgment of the Trustee and the Company to protect the
Company, the Trustee, any Agent and any authenticating agent from any loss that
any of them may suffer if a Note is replaced.  The Company may charge for its
expenses in replacing a Note.

     Every replacement Note is an additional obligation of the Company and
shall be entitled to all of the benefits of this Indenture equally and
proportionately with all other Notes duly issued hereunder.

                                       35

 
Section 2.08.  Outstanding Notes.

     The Notes outstanding at any time are all the Notes authenticated by the
Trustee except for those canceled by it, those delivered to it for cancellation,
those reductions in the interest in a Global Note effected by the Trustee in
accordance with the provisions hereof, and those described in this Section as
not outstanding.  Except as set forth in Section 2.09 hereof, a Note does not
cease to be outstanding because the Company or an Affiliate of the Company holds
the Note; however, Notes held by the Company or a Subsidiary of the Company
shall not be deemed to be outstanding for purposes of Section 3.07(b) hereof.

     If a Note is replaced pursuant to Section 2.07 hereof, it ceases to be
outstanding unless the Trustee receives proof satisfactory to it that the
replaced Note is held by a bona fide purchaser.

     If the principal amount of any Note is considered paid under Section 4.01
hereof, it ceases to be outstanding and interest on it ceases to accrue.

     If the Paying Agent (other than the Company, a Subsidiary or an Affiliate
of any thereof) holds, on a redemption date or maturity date, money sufficient
to pay Notes payable on that date, then on and after that date such Notes shall
be deemed to be no longer outstanding and shall cease to accrue interest.

Section 2.09.  Treasury Notes.

     In determining whether the Holders of the required principal amount of
Notes have concurred in any direction, waiver or consent, Notes owned by the
Company, or by any Person directly or indirectly controlling or controlled by or
under direct or indirect common control with the Company, shall be considered as
though not outstanding, except that for the purposes of determining whether the
Trustee shall be protected in relying on any such direction, waiver or consent,
only Notes that the Trustee knows are so owned shall be so disregarded.

Section 2.10.  Temporary Notes.

     Until certificates representing Notes are ready for delivery, the Company
may prepare and the Trustee, upon receipt of an Authentication Order, shall
authenticate temporary Notes.  Temporary Notes shall be substantially in the
form of certificated Notes but may have variations that the Company considers
appropriate for temporary Notes and as shall be reasonably acceptable to the
Trustee.  Without unreasonable delay, the Company shall prepare and the Trustee
shall authenticate definitive Notes in exchange for temporary Notes.

     Holders of temporary Notes shall be entitled to all of the benefits of
this Indenture.

Section 2.11.  Cancellation.

     The Company at any time may deliver Notes to the Trustee for cancellation.
The Registrar and Paying Agent shall forward to the Trustee any Notes
surrendered to them for registration of transfer, exchange or payment.  The
Trustee and no one else shall cancel all Notes surrendered for registration of

                                       36

 
transfer, exchange, payment, replacement or cancellation.  Certification of the
cancellation of all canceled Notes shall be delivered to the Company.  The
Company may not issue new Notes to replace Notes that it has paid or that have
been delivered to the Trustee for cancellation.

Section 2.12.  Defaulted Interest.

     If the Company defaults in a payment of interest on the Notes, it shall pay
the defaulted interest in any lawful manner plus, to the extent lawful, interest
payable on the defaulted interest, to the Persons who are Holders on a
subsequent special record date, in each case at the rate provided in the Notes
and in Section 4.01 hereof. The Company shall notify the Trustee in writing of
the amount of defaulted interest proposed to be paid on each Note and the date
of the proposed payment. The Company shall fix or cause to be fixed each such
special record date and payment date, provided that no such special record date
shall be less than 10 days prior to the related payment date for such defaulted
interest. At least 15 days before the special record date, the Company (or, upon
the written request of the Company, the Trustee in the name and at the expense
of the Company) shall mail or cause to be mailed to Holders a notice that states
the special record date, the related payment date and the amount of such
interest to be paid.

                                   ARTICLE 3
                           REDEMPTION AND PREPAYMENT

Section 3.01.  Notices to Trustee.

     If the Company elects to redeem Notes pursuant to the optional redemption
provisions of Section 3.07 hereof, it shall furnish to the Trustee, at least 30
days but not more than 60 days before a redemption date, an Officers'
Certificate setting forth (i) the clause of this Indenture pursuant to which the
redemption shall occur, (ii) the redemption date, (iii) the principal amount of
Notes to be redeemed and (iv) the redemption price.

Section 3.02.  Selection of Notes to Be Redeemed.

     If less than all of the Notes are to be redeemed or purchased in an offer
to purchase at any time, the Trustee shall select the Notes to be redeemed or
purchased among the Holders of the Notes in compliance with the requirements of
the principal national securities exchange, if any, on which the Notes are
listed or, if the Notes are not so listed, on a pro rata basis, by lot or in
accordance with any other method the Trustee considers fair and appropriate.  In
the event of partial redemption by lot, the particular Notes to be redeemed
shall be selected, unless otherwise provided herein, not less than 30 nor more
than 60 days prior to the redemption date by the Trustee from the outstanding
Notes not previously called for redemption.

     The Trustee shall promptly notify the Company in writing of the Notes
selected for redemption and, in the case of any Note selected for partial
redemption, the principal amount thereof to be redeemed.  Notes and portions of
Notes selected shall be in amounts of $1,000 or whole multiples of $1,000;
except that if all of the Notes of a Holder are to be redeemed, the entire
outstanding amount of Notes held by

                                       37

 
such Holder, even if not a multiple of $1,000, shall be redeemed. Except as
provided in the preceding sentence, provisions of this Indenture that apply to
Notes called for redemption also apply to portions of Notes called for
redemption.

Section 3.03.  Notice of Redemption.

     Subject to the provisions of Section 3.09 hereof, at least 30 days but not
more than 60 days before a redemption date, the Company shall mail or cause to
be mailed, by first class mail, a notice of redemption to each Holder whose
Notes are to be redeemed at its registered address.

     The notice shall identify the Notes to be redeemed and shall state:

     (a)  the redemption date;

     (b)  the redemption price;

     (c) if any Note is being redeemed in part, the portion of the principal
amount of such Note to be redeemed and that, after the redemption date upon
surrender of such Note, a new Note or Notes in principal amount equal to the
unredeemed portion shall be issued upon cancellation of the original Note;

     (d) the name and address of the Paying Agent;

     (e) that Notes called for redemption must be surrendered to the Paying
Agent to collect the redemption price;

     (f) that, unless the Company defaults in making such redemption payment,
interest on Notes called for redemption ceases to accrue on and after the
redemption date;

     (g) the paragraph of the Notes and/or Section of this Indenture pursuant
to which the Notes called for redemption are being redeemed; and

     (h) that no representation is made as to the correctness or accuracy of
the CUSIP number, if any, listed in such notice or printed on the Notes.

     At the Company's request, the Trustee shall give the notice of redemption
in the Company's name and at its expense; provided, however, that the Company
shall have delivered to the Trustee, at least 45 days prior to the redemption
date, an Officers' Certificate requesting that the Trustee give such notice and
setting forth the information to be stated in such notice as provided in the
preceding paragraph.

     The notice mailed in the manner herein provided shall be conclusively
presumed to have been duly given whether or not the Holder receives such Notice.
In any case, failure to give such notice by mail or any defects in the notice to
any Holder shall not affect the validity of the proceeding for the redemption of
the Notes of any other Holder.

                                       38

 
Section 3.04.  Effect of Notice of Redemption.

     Once notice of redemption is mailed in accordance with Section 3.03
hereof, Notes called for redemption become irrevocably due and payable on the
redemption date at the redemption price.  A notice of redemption may not be
conditional.

Section 3.05.  Deposit of Redemption Price.

     One Business Day prior to the redemption date, the Company shall deposit
with the Trustee or with the Paying Agent money sufficient to pay the redemption
price of and accrued interest on all Notes to be redeemed on that date.  The
Trustee or the Paying Agent shall promptly return to the Company any money
deposited with the Trustee or the Paying Agent by the Company in excess of the
amounts necessary to pay the redemption price of, and accrued interest on, all
Notes to be redeemed.

     If the Company complies with the provisions of the preceding paragraph, on
and after the redemption date, interest shall cease to accrue on the Notes or
the portions of Notes called for redemption.  If a Note is redeemed on or after
an interest record date but on or prior to the related interest payment date,
then any accrued and unpaid interest shall be paid to the Person in whose name
such Note was registered at the close of business on such record date.  If any
Note called for redemption shall not be so paid upon surrender for redemption
because of the failure of the Company to comply with the preceding paragraph,
interest shall be paid on the unpaid principal, from the redemption date until
such principal is paid, and to the extent lawful on any interest not paid on
such unpaid principal, in each case at the rate provided in the Notes and in
Section 4.01 hereof.

Section 3.06.  Notes Redeemed in Part.

     Upon surrender of a Note that is redeemed in part, the Company shall issue
and, upon the Company's written request, the Trustee shall authenticate for the
Holder at the expense of the Company a new Note equal in principal amount to the
unredeemed portion of the Note surrendered.

Section 3.07.    Optional Redemption.

     (a) Except as set forth in clause (b) of this Section 3.07, the Company
shall not have the option to redeem the Notes pursuant to this Section 3.07
prior to August 15, 2003.  Thereafter, the Company shall have the option to
redeem the Notes, in whole or in part, in cash at the redemption prices
(expressed as percentages of principal amount) set forth below plus accrued and
unpaid interest and Liquidated Damages thereon, if any, to the applicable
redemption date, if redeemed during the twelve-month period beginning on August
15 of the years indicated below:



Year                                          Percentage
- ----                                          ----------
2003........................................    105.625%
2004........................................    103.750%
2005........................................    101.875%
2006 and thereafter.........................    100.000%

                                       39

 
     (b) Notwithstanding the provisions of clause (a) of this Section 3.07, at
any time prior to August 15, 2001, the Company may (but will not have the
obligation to) on any one or more occasions redeem up to 35% of the aggregate
principal amount of Notes originally issued at a redemption price equal to
111.250% of the principal amount thereof, plus accrued and unpaid interest and
Liquidated Damages, if any, thereon to the redemption date, with the net cash
proceeds of one or more Public Equity Offerings; provided that at least 65% of
the aggregate principal amount of Notes originally issued remain outstanding
immediately after the occurrence of such redemption (excluding Notes held by the
Company and its Subsidiaries); and provided, further, that such redemption shall
occur within 180 days of the date of the closing of such Public Equity Offering.

     (c) Any redemption pursuant to this Section 3.07 shall be made pursuant to
the provisions of Section 3.01 through 3.06 hereof.

Section 3.08.  Mandatory Redemption.
     
     The Company shall not be required to make mandatory redemption payments
with respect to the Notes.

Section 3.09.  Offer to Purchase by Application of Excess Proceeds.

     In the event that, pursuant to Section 4.10 hereof, the Company shall be
required to commence an offer to all Holders to purchase Notes (an "Asset Sale
Offer"), it shall follow the procedures specified below.

     The Asset Sale Offer shall remain open for a period of 20 Business Days
following its commencement and no longer, except to the extent that a longer
period is required by applicable law (the "Offer Period").  No later than five
Business Days after the termination of the Offer Period (the "Purchase Date"),
the Company shall purchase the principal amount of Notes required to be
purchased pursuant to Section 4.10 hereof (the "Offer Amount") or, if less than
the Offer Amount has been tendered, all Notes tendered in response to the Asset
Sale Offer. Payment for any Notes so purchased shall be made in the same manner
as interest payments are made.

     If the Purchase Date is on or after an interest record date and on or
before the related interest payment date, any accrued and unpaid interest shall
be paid to the Person in whose name a Note is registered at the close of
business on such record date, and no additional interest shall be payable to
Holders who tender Notes pursuant to the Asset Sale Offer.

     Upon the commencement of an Asset Sale Offer, the Company shall send, by
first class mail, a notice to the Trustee and each of the Holders, with a copy
to the Trustee.  The notice shall contain all instructions and materials
necessary to enable such Holders to tender Notes pursuant to the Asset Sale
Offer.  The Asset Sale Offer shall be made to all Holders.  The notice, which
shall govern the terms of the Asset Sale Offer, shall state:

     (a) that the Asset Sale Offer is being made pursuant to this Section 3.09
and Section 4.10 hereof and the length of time the Asset Sale Offer shall remain
open;

                                       40

 
      (b) the Offer Amount, the purchase price and the Purchase Date;

      (c) that any Note not tendered or accepted for payment shall continue to
accrete or accrue interest;

      (d) that, unless the Company defaults in making such payment, any Note
accepted for payment pursuant to the Asset Sale Offer shall cease to accrete or
accrue interest after the Purchase Date;

      (e) that Holders electing to have a Note purchased pursuant to an Asset
Sale Offer may elect to have Notes purchased in integral multiples of $1,000
only;

      (f) that Holders electing to have a Note purchased pursuant to any Asset
Sale Offer shall be required to surrender the Note, with the form entitled
"Option of Holder to Elect Purchase" on the reverse of the Note completed, or
transfer by book-entry transfer, to the Company, a depositary, if appointed by
the Company, or a Paying Agent at the address specified in the notice at least
three days before the Purchase Date;

      (g) that Holders shall be entitled to withdraw their election if the
Company, the Depositary or the Paying Agent, as the case may be, receives, not
later than the expiration of the Offer Period, a telegram, telex, facsimile
transmission or letter setting forth the name of the Holder, the principal
amount of the Note the Holder delivered for purchase and a statement that such
Holder is withdrawing his election to have such Note purchased;

      (h) that, if the aggregate principal amount of Notes surrendered by
Holders exceeds the Offer Amount, the Company shall select the Notes to be
purchased on a pro rata basis (with such adjustments as may be deemed
appropriate by the Company so that only Notes in denominations of $1,000, or
integral multiples thereof, shall be purchased); and

      (i) that Holders whose Notes were purchased only in part shall be issued
new Notes equal in principal amount to the unpurchased portion of the Notes
surrendered (or transferred by book-entry transfer).

      On or before the Purchase Date, the Company shall, to the extent lawful,
accept for payment, on a pro rata basis to the extent necessary, the Offer
Amount of Notes or portions thereof tendered pursuant to the Asset Sale Offer,
or if less than the Offer Amount has been tendered, all Notes tendered, and
shall deliver to the Trustee an Officers' Certificate stating that such Notes or
portions thereof were accepted for payment by the Company in accordance with the
terms of this Section 3.09.  The Company, the Depositary or the Paying Agent, as
the case may be, shall promptly (but in any case not later than five days after
the Purchase Date) mail or deliver to each tendering Holder an amount equal to
the purchase price of the Notes tendered by such Holder and accepted by the
Company for purchase, and the Company shall promptly issue a new Note, and the
Trustee, upon written request from the Company shall authenticate and mail or
deliver such new Note to such Holder, in a principal amount equal to any
unpurchased portion of the Note surrendered.  Any Note not so accepted shall be
promptly mailed or delivered by the Company to the Holder thereof.  The Company
shall publicly announce the results of the Asset Sale Offer on the Purchase Date
or as soon as practicable thereafter.

                                       41

 
      Other than as specifically provided in this Section 3.09, any purchase
pursuant to this Section 3.09 shall be made pursuant to the provisions of
Sections 3.01 through 3.06 hereof.

                                   ARTICLE 4
                                   COVENANTS

Section 4.01.  Payment of Notes.

      The Company shall pay or cause to be paid the principal of, premium, if
any, and interest on the Notes on the dates and in the manner provided in the
Notes.  Principal, premium, if any, and interest shall be considered paid on the
date due if the Paying Agent, if other than the Company or a Subsidiary thereof,
holds as of 10:00 a.m.  Eastern Time on the due date money deposited by the
Company in immediately available funds and designated for and sufficient to pay
all principal, premium, if any, and interest then due.  The Company shall pay
all Liquidated Damages, if any, in the same manner on the dates and in the
amounts set forth in the Registration Rights Agreement.  The Paying Agent shall
return to the Company no later than five days following the date of payment, any
money that exceeds the amount of principal, premium, if any, and interest
payable on the Notes.

      The Company shall pay interest (including post-petition interest in any
proceeding under any Bankruptcy Law) on overdue principal at the rate equal to
1% per annum in excess of the then applicable interest rate on the Notes to the
extent lawful; it shall pay interest (including post-petition interest in any
proceeding under any Bankruptcy Law) on overdue installments of interest and
Liquidated Damages (without regard to any applicable grace period) at the same
rate to the extent lawful.

Section 4.02.  Maintenance of Office or Agency.

      The Company shall maintain in the Borough of Manhattan, the City of New
York, an office or agency (which may be an office of the Trustee or an affiliate
of the Trustee, Registrar or co-registrar) where Notes may be surrendered for
registration of transfer or for exchange and where notices and demands to or
upon the Company in respect of the Notes and this Indenture may be served.  The
Company shall give prompt written notice to the Trustee of the location, and any
change in the location, of such office or agency.  If at any time the Company
shall fail to maintain any such required office or agency or shall fail to
furnish the Trustee with the address thereof, such presentations, surrenders,
notices and demands may be made or served at the Corporate Trust Office of the
Trustee.

      The Company may also from time to time designate one or more other offices
or agencies where the Notes may be presented or surrendered for any or all such
purposes and may from time to time rescind such designations; provided, however,
that no such designation or rescission shall in any manner relieve the Company
of its obligation to maintain an office or agency in the Borough of Manhattan,
the City of New York for such purposes.  The Company shall give prompt written
notice to the Trustee of any such designation or rescission and of any change in
the location of any such other office or agency.

      The Company hereby designates the Corporate Trust Office of the Trustee as
one such office or agency of the Company in accordance with Section 2.03.

                                       42

 
Section 4.03.  Reports.

      (a) Whether or not required by the rules and regulations of the SEC, so
long as any Notes are outstanding, the Company shall furnish to the Holders of
Notes (i) all quarterly financial information beginning with the quarter ended
September 30, 1998 and annual financial information that would be required to be
contained in a filing with the Commission on Forms 10-Q and 10-K if the Company
was required to file such Forms, including a "Management's Discussion and
Analysis of Financial Condition and Results of Operations" that describes the
financial condition and results of operations of the Company and its
consolidated Subsidiaries (showing in reasonable detail, either on the face of
the financial statements or in the footnotes thereto and in Management's
Discussion and Analysis of Financial Condition and Results of Operations, the
financial condition and results of operations of the Company and its Restricted
Subsidiaries separate from the financial condition and results of operations of
the Unrestricted Subsidiaries of the Company) and, with respect to the annual
information only, a report thereon by the Company's certified independent
accountants and (ii) all current reports that would be required to be filed with
the SEC on Form 8-K if the Company were required to file such reports, in each
case within the time periods specified in the Commission's rules and
regulations.  In addition, following the consummation of the exchange offer
contemplated by the Registration Rights Agreement, whether or not required by
the rules and regulations of the SEC, the Company shall file a copy of all such
information and reports with the SEC for public availability within the time
periods specified in the SEC's rules and regulations (unless the SEC will not
accept such a filing) and make such information available to securities analysts
and prospective investors upon request.

      (b) For so long as any Notes remain outstanding, (i) at all times the SEC
does not accept the filings provided for in Section 4.03(a) hereof or (ii) such
filings provided for in Section 4.03(a) hereof do not contain the information
required to be delivered upon request pursuant to Rule 144A(d)(4) under the
Securities Act, then, in each case, the Company shall agree to furnish to the
Holders and to securities analysts and prospective investors, upon their
request, the information required to be delivered pursuant to Rule 144A(d)(4)
under the Securities Act.

Section 4.04.  Compliance Certificate.

      (a) The Company and each Subsidiary Guarantor (to the extent that such
Subsidiary Guarantor is so required under the TIA) shall deliver to the Trustee,
within 90 days after the end of each fiscal year, an Officers' Certificate
stating that a review of the activities of the Company and its Subsidiaries
during the preceding fiscal year has been made under the supervision of the
signing Officers with a view to determining whether the Company has kept,
observed, performed and fulfilled its obligations under this Indenture, and
further stating, as to each such Officer signing such certificate, that to the
best of his or her knowledge the Company has kept, observed, performed and
fulfilled each and every covenant contained in this Indenture and is not in
default in the performance or observance of any of the terms, provisions and
conditions of this Indenture or the Pledge Agreement (or, if a Default or Event
of Default shall have occurred, describing all such Defaults or Events of
Default of which he or she may have knowledge and what action the Company is
taking or proposes to take with respect thereto) and that to the best of his or
her knowledge no event has occurred and remains in existence by reason of which
payments on account of the principal of or interest, if any, on the Notes is
prohibited or if such 

                                       43

 
event has occurred, a description of the event and what action the Company is
taking or proposes to take with respect thereto.

      (b) So long as not contrary to the then current recommendations of the
American Institute of Certified Public Accountants, the Company shall use its
best efforts to obtain a written statement to accompany the year-end financial
statements delivered pursuant to Section 4.03(a) of the Company's independent
public accountants (who shall be a firm of established national reputation) that
in making the examination necessary for certification of such financial
statements, nothing has come to their attention that would lead them to believe
that the Company has violated any provisions of Article 4 or Article 5 hereof
or, if any such violation has occurred, specifying the nature and period of
existence thereof, it being understood that such accountants shall not be liable
directly or indirectly to any Person for any failure to obtain knowledge of any
such violation.

      (c) The Company shall, so long as any of the Notes are outstanding,
deliver to the Trustee, forthwith upon any Officer becoming aware of any Default
or Event of Default, an Officers' Certificate specifying such Default or Event
of Default and what action the Company is taking or proposes to take with
respect thereto.

Section 4.05.  Taxes.

      The Company shall pay, and shall cause each of its Subsidiaries to pay,
prior to delinquency, all material taxes, assessments, and governmental levies
except such as are contested in good faith and by appropriate proceedings or
where the failure to effect such payment is not adverse in any material respect
to the Holders of the Notes.

Section 4.06.  Stay, Extension and Usury Laws.

      The Company and each of the Subsidiary Guarantors covenants (to the extent
that it may lawfully do so) that it shall not at any time insist upon, plead, or
in any manner whatsoever claim or take the benefit or advantage of, any stay,
extension or usury law wherever enacted, now or at any time hereafter in force,
that may affect the covenants or the performance of this Indenture; and the
Company and each of the Subsidiary Guarantors (to the extent that it may
lawfully do so) hereby expressly waives all benefit or advantage of any such
law, and covenants that it shall not, by resort to any such law, hinder, delay
or impede the execution of any power herein granted to the Trustee, but shall
suffer and permit the execution of every such power as though no such law has
been enacted.

Section 4.07.  Restricted Payments.

      The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly: (i) declare or pay any dividend or make
any other payment or distribution on account of the Company's or any of its
Restricted Subsidiaries' Equity Interests (including, without limitation, any
payment in connection with any merger or consolidation involving the Company or
any of its Restricted Subsidiaries) or to the direct or indirect holders of the
Company's or any of its Restricted Subsidiaries' Equity Interests in their
capacity as such (other than, in each case, dividends or distributions payable
in Equity Interests (other than Disqualified Stock) of the Company or dividends
or distributions payable to 

                                       44

 
the Company or a Restricted Subsidiary of the Company); (ii) purchase, redeem or
otherwise acquire or retire for value (including, without limitation, in
connection with any merger or consolidation involving the Company) any Equity
Interests of the Company (other than Equity Interests owned by the Company or
any Restricted Subsidiary of the Company) or any direct or indirect parent of
the Company; (iii) make any payment on or with respect to, or purchase, redeem,
defease or otherwise acquire or retire for value any Indebtedness that is
subordinated to the Notes (other than any subordinated indebtedness held by the
Company or any Subsidiary Guarantor), except a payment of interest or principal
at Stated Maturity; or (iv) make any Restricted Investment (all such payments
and other actions set forth in clauses (i) through (iv) above being collectively
referred to as "Restricted Payments"), unless:

         (a) at the time of and after giving effect to such Restricted Payment,
   no Default or Event of Default shall have occurred and be continuing or would
   occur as a consequence thereof; and

         (b) the Company would, at the time of such Restricted Payment and after
   giving pro forma effect thereto as if such Restricted Payment had been made
   at the beginning of the applicable four-quarter period, have been permitted
   to incur at least $1.00 of additional Indebtedness pursuant to the Fixed
   Charge Coverage Ratio test set forth in the first paragraph of Section 4.09
   hereof; and

         (c) such Restricted Payment, together with the aggregate amount of all
   other Restricted Payments made by the Company and its Restricted Subsidiaries
   after the date of this Indenture (excluding Restricted Payments permitted by
   clauses (ii), (iii), (iv), (viii), (ix) and (xi) of the next succeeding
   paragraph), is less than the sum, without duplication, of (i) 50% of the
   Consolidated Net Income of the Company for the period (taken as one
   accounting period) from the beginning of the first fiscal quarter commencing
   after the date of this Indenture to the end of the Company's most recently
   ended fiscal quarter for which internal financial statements are available at
   the time of such Restricted Payment (or, if such Consolidated Net Income for
   such period is a deficit, less 100% of such deficit), plus (ii) 100% of the
   aggregate fair market value of Qualified Proceeds received by the Company
   since the date of this Indenture as a contribution to its equity capital or
   from the issue or sale of Equity Interests of the Company (other than
   Disqualified Stock) or from the issue or sale of Disqualified Stock or debt
   securities of the Company that have been converted into such Equity Interests
   (other than Equity Interests (or Disqualified Stock or convertible debt
   securities) sold to a Subsidiary of the Company), plus (iii) to the extent
   that any Restricted Investment that was made after the date of this Indenture
   is sold for cash or otherwise liquidated or repaid for Qualified Proceeds,
   the lesser of (A) the fair market of the Qualified Proceeds received with
   respect to such Restricted Investment (less the cost of disposition, if any)
   and (B) the initial amount of such Restricted Investment, plus (iv) 50% of
   any dividends received by the Company or a Wholly Owned Restricted Subsidiary
   after the date of this Indenture from an Unrestricted Subsidiary of the
   Company, to the extent that such dividends were not otherwise included in
   Consolidated Net Income of the Company for such period, plus (v) to the
   extent that any Unrestricted Subsidiary is redesignated as a Restricted
   Subsidiary after the date of this Indenture, the lesser of (A) the fair
   market value of the Company's Investment in such Subsidiary as of the date of
   such redesignation or (B) such fair market value as of the date on which such
   Subsidiary was originally designated as an Unrestricted Subsidiary.

                                       45

 
      The foregoing provisions shall not prohibit: (i) the payment of any
dividend within 60 days after the date of declaration thereof, if at said date
of declaration such payment would have complied with the provisions hereof; (ii)
the redemption, repurchase, retirement, defeasance or other acquisition of any
subordinated Indebtedness or Equity Interests of the Company or any Subsidiary
Guarantor, in each case, in exchange for, or out of the net cash proceeds of the
substantially concurrent sale (other than to a Subsidiary of the Company) of,
other Equity Interests of the Company (other than any Disqualified Stock) or the
net cash proceeds of a common equity capital contribution to the Company;
provided that the amount of any such net cash proceeds that are utilized for any
such redemption, repurchase, retirement, defeasance or other acquisition shall
be excluded from clause (c)(ii) of the preceding paragraph; (iii) the
defeasance, redemption, repurchase or other acquisition of subordinated
Indebtedness with the net cash proceeds from an incurrence of Permitted
Refinancing Indebtedness; (iv) the payment of any dividend or making of any
distribution by a Subsidiary of the Company to the holders of its Equity
Interests on a pro rata basis; (v) the repurchase, redemption or other
acquisition or retirement for value of any Equity Interests of the Company or
any Subsidiary of the Company held by any former member of the Company's (or any
of their Subsidiaries') Board of Directors or any former officer, employee or
director of the Company or any of its Restricted Subsidiaries pursuant to any
equity subscription agreement, stockholder agreement, stock option agreement,
employment agreement or other similar agreements or employee benefit plan;
provided that (A) the aggregate price paid for all such repurchased, redeemed,
acquired or retired Equity Interests shall not exceed (1) $2.0 million in any
calendar year (with unused amounts in any calendar year being carried over to
succeeding calendar years subject to a maximum (without giving effect to clause
(2)) of $5.0 million, plus (2) in the case of a repurchase, redemption or other
acquisition or retirement of Equity Interests of the Company, the aggregate cash
proceeds received by the Company during such calendar year from any reissuance
of Equity Interests by or the Company to employees, officers and directors of
the Company and its Restricted Subsidiaries plus the cash proceeds of any "key
man" life insurance policy received by the Company with respect to the owner of,
and any cash proceeds paid to the Company in connection with the issuance or
exercise of, any management or employee Equity Interests so acquired plus (3) in
the case of a repurchase, redemption or other acquisition or retirement of
Equity Interests of a Subsidiary Guarantor, the aggregate cash proceeds received
by such Subsidiary Guarantor during such calendar year from any reissuance of
Equity Interests of such Subsidiary Guarantor to employees, officers, and
directors of such Subsidiary Guarantor plus the cash proceeds of any "key man"
life insurance policy received by such Subsidiary Guarantor with respect to the
owner of any cash proceeds paid to such Subsidiary Guarantor in connection with
the issuance or exercise of, any management or employee Equity Interests so
acquired, and (B) no Default or Event of Default shall have occurred and be
continuing immediately after such transaction; provided, further that the
aggregate cash proceeds referred to in (2) above shall be excluded from clause
(c)(ii) of the preceding paragraph; (vi) any Investment to the extent that the
consideration therefor consists of the net cash proceeds of the substantially
concurrent issue and sale (other than to a Restricted Subsidiary) of Equity
Interests of the Company (other than any Disqualified Stock); (vii) so long as
no Default or Event of Default has occurred and is continuing and the Company
can incur at least $1.00 of additional indebtedness pursuant to the Fixed Charge
Coverage Ratio test set forth in the first paragraph of Section 4.09 hereof, the
declaration and payment of dividends to holders of any class or series of
Disqualified Stock of the Company, or any Subsidiary Guarantor issued after the
date of this Indenture in accordance with Section 4.09 hereof; (viii) repurchase
of Equity Interests deemed to occur upon exercise of stock options if such
Equity Interests represent a portion of the exercise price of such options; (ix)
loans to employees of the 

                                       46

 
Company or any Subsidiary Guarantor not to exceed $2.0 million at any one time
outstanding; (x) Restricted Payments not to exceed $5.0 million since the date
of this Indenture and (xi) payments made pursuant to the Merger Agreement and
tax "gross up" payments made pursuant to the Stockholders Agreement in
connection with the Recapitalization, in each case, as in effect on the date of
this Indenture, as the same may be amended, modified or replaced from time to
time so long as such amendment, modification or replacement does not increase
the amount of any such payments from the amount of such payments provided for in
the Merger Agreement or Stockholders Agreement, as the case may be, as in effect
on the date of this Indenture.

      The Board of Directors may designate any Restricted Subsidiary to be an
Unrestricted Subsidiary if such designation would not cause a Default.  For
purposes of making such determination, all outstanding Investments by the
Company and its Restricted Subsidiaries (except to the extent repaid in cash) in
the Subsidiary so designated will be deemed to be Restricted Payments at the
time of such designation and will reduce the amount available for Restricted
Payments under the first paragraph of this Section 4.07.  All such outstanding
Investments will be deemed to constitute Investments in an amount equal to the
fair market value of such Investments at the time of such designation.  Such
designation will only be permitted if such Restricted Payment would be permitted
at such time and if such Restricted Subsidiary otherwise meets the definition of
an Unrestricted Subsidiary.

      For purposes of determining compliance with this Section 4.07, in the
event that a Restricted Payment meets the criteria of more than one of the
exceptions described in (i) through (xi) above or is entitled to be made
pursuant to the first paragraph of this Section 4.07, the Company shall, in its
sole discretion, classify such Restricted Payment in any manner that complies
with this Section 4.07.  The amount of all Restricted Payments (other than cash)
shall be the fair market value on the date of the Restricted Payment of the
asset(s) or securities proposed to be transferred or issued by the Company or
such Subsidiary, as the case may be, pursuant to the Restricted Payment.  The
fair market value of any non-cash Restricted Payment shall be determined by the
Board of Directors whose resolution with respect thereto shall be delivered to
the Trustee, such determination to be based upon an opinion or appraisal issued
by an accounting, appraisal or investment banking firm of national standing if
such fair market value exceeds $7.5 million. Not later than the date of making
any Restricted Payment, the Company shall deliver to the Trustee an Officers'
Certificate stating that such Restricted Payment is permitted and setting forth
the basis upon which the calculations required by this Section 4.07 were
computed, together with a copy of any fairness opinion or appraisal required by
this Indenture.

Section 4.08.  Dividend and Other Payment Restrictions Affecting Subsidiaries.

      The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly, create or otherwise cause or suffer to
exist or become effective any encumbrance or restriction on the ability of any
Restricted Subsidiary to (i)(a) pay dividends or make any other distributions to
the Company or any of its Restricted Subsidiaries (1) on its Capital Stock or
(2) with respect to any other interest or participation in, or measured by, its
profits, or (b) pay any indebtedness owed to the Company or any of its
Restricted Subsidiaries, (ii) make loans or advances to the Company or any of
its Restricted Subsidiaries or (iii) transfer any of its properties or assets to
the Company or any of its Restricted Subsidiaries.  However, the foregoing
restrictions will not apply to encumbrances or restrictions existing under or by
reason of (a) Existing Indebtedness as in effect on the date of this Indenture,
(b) the New 

                                       47

 
Credit Facility and Permitted Bonding Obligations as in effect as of the date of
this Indenture, and any amendments, modifications, restatements, renewals,
increases, supplements, refundings, replacements or refinancings thereof,
provided that such amendments, modifications, restatements, renewals, increases,
supplements, refundings, replacement or refinancings are not materially more
restrictive, taken as a whole, with respect to such dividend and other payment
restrictions than those contained in the New Credit Facility or in agreements
with respect to Permitted Bonding Obligations, as applicable, as in effect on
the date of this Indenture, (c) this Indenture, the Notes and the Subsidiary
Guarantees, (d) applicable law, (e) any instrument governing Indebtedness or
Capital Stock of a Person acquired by the Company or any of its Restricted
Subsidiaries as in effect at the time of such acquisition (except to the extent
such Indebtedness was incurred in connection with or in contemplation of such
acquisition), which encumbrance or restriction is not applicable to any Person,
or the properties or assets of any Person, other than the Person, or the
property or assets of the Person, so acquired, provided that, in the case of
Indebtedness, such Indebtedness was permitted by the terms hereof to be
incurred, (f) customary non-assignment provisions in leases or other similar
agreements entered into in the ordinary course of business and consistent with
past practices, (g) purchase money obligations for property acquired in the
ordinary course of business that impose restrictions of the nature described in
clause (iii) above on the property so acquired, (h) any agreement for the sale
of a Restricted Subsidiary that restricts distributions by that Restricted
Subsidiary pending its sale, (i) Permitted Refinancing Indebtedness, provided
that the restrictions contained in the agreements governing such Permitted
Refinancing Indebtedness are not materially more restrictive, taken as a whole,
than those contained in the agreements governing the Indebtedness being
refinanced, (j) secured Indebtedness otherwise permitted to be incurred pursuant
to the provisions of Section 4.12 hereof that limits the right of the debtor to
dispose of the assets securing such Indebtedness, (k) provisions with respect to
the disposition or distribution of assets or property in joint venture
agreements and other similar agreements entered into in the ordinary course of
business, (l) restrictions on cash or other deposits or net worth imposed by
customers under contracts entered into in the ordinary course of business, (m)
mortgage or construction financing that imposes restrictions on the transfer of
the property acquired or improved, (n) encumbrances or restrictions imposed by
amendments to the contracts, agreements or obligations referred to in the
foregoing clauses (a), (c), (e), (f), (g), (h), (j), (k) and (n), provided that
such amendments are not materially more restrictive than the agreement so
amended; and (o) protective liens filed in connection with sale-leaseback
transactions permitted under Section 4.17 hereof.

Section 4.09.  Incurrence of Indebtedness and Issuance of Disqualified Stock.

      The Company shall not, and shall not permit any of its Subsidiaries to,
directly or indirectly, create, incur, issue, assume, guarantee or otherwise
become directly or indirectly liable, contingently or otherwise, with respect to
(collectively, "incur") any Indebtedness (including Acquired Debt) and that the
Company will not issue any Disqualified Stock and will not permit any of its
Subsidiaries to issue any shares of preferred stock; provided, however, that the
Company may incur Indebtedness (including Acquired Debt) or issue shares of
Disqualified Stock and the Company's Subsidiaries may incur Indebtedness or
issue preferred equity if the Fixed Charge Coverage Ratio for the Company's most
recently ended four full fiscal quarters for which internal financial statements
are available immediately preceding the date on which such additional
Indebtedness is incurred or such Disqualified Stock is issued would have been at
least 2.0 to 1, determined on a pro forma basis (including a pro forma
application of 

                                       48

 
the net proceeds therefrom), as if the additional Indebtedness had been
incurred, or the Disqualified Stock had been issued, as the case may be, at the
beginning of such four-quarter period.

      The provisions of the first paragraph of this Section 4.09 shall not apply
to the incurrence of any of the following items of Indebtedness (collectively,
"Permitted Debt"):

         (i)    the incurrence by the Company and the Subsidiary Guarantors of
   term Indebtedness under the New Credit Facility (including any guarantee
   thereof by any Subsidiary Guarantor); provided that the aggregate principal
   amount of all term Indebtedness outstanding under the New Credit Facility
   after giving effect to such incurrence does not exceed an amount equal to
   $55.0 million plus (in the case of any refinancing thereof) the aggregate
   amount of fees, underwriting discounts, premiums and other costs and expenses
   incurred in connection with such refinancing less the aggregate amount of all
   scheduled or mandatory repayments of the principal of any term Indebtedness
   under the New Credit Facility (other than repayments that are immediately
   reborrowed) that have been made since the date hereof;

         (ii)   the incurrence by the Company and the Subsidiary Guarantors of
   Indebtedness and reimbursement obligations in respect of letters of credit
   under Credit Facilities (including any guarantee thereof by any Subsidiary
   Guarantor); provided that the aggregate principal amount of all revolving
   credit or other Indebtedness (other than term Indebtedness permitted under
   clause (i) above) (with letters of credit being deemed to have a principal
   amount equal to the maximum face amount thereunder) outstanding under all
   Credit Facilities after giving effect to such incurrence does not exceed an
   amount equal to $55.0 million;

         (iii)  the incurrence by the Company and its Restricted Subsidiaries of
   the Existing Indebtedness;

         (iv)   the incurrence by the Company of Indebtedness represented by the
   Notes sold in the Offering and the incurrence by the Subsidiary Guarantors of
   Indebtedness represented by the Subsidiary Guarantees of such Notes;

         (v)    the incurrence by the Company or any of its Restricted
   Subsidiaries of Indebtedness represented by Capital Lease Obligations,
   mortgage or construction financings or purchase money obligations or similar
   financings, in each case incurred for the purpose of financing all or any
   part of the purchase price or cost of construction or improvement of
   property, plant or equipment used in the business of the Company or such
   Restricted Subsidiary, in an aggregate principal amount not to exceed $20.0
   million at any time outstanding;

         (vi)   the incurrence by the Company or any of its Restricted
   Subsidiaries of Permitted Refinancing Indebtedness in exchange for, or the
   net proceeds of which are used to refund, refinance or replace Indebtedness
   (other than intercompany Indebtedness) that was permitted by this Indenture
   to be incurred under the first paragraph of this Section 4.09 or clauses
   (iii), (iv), (v), (vi) or (ix) of this Section 4.09;

                                       49

 
         (vii)  the incurrence by the Company or any of its Restricted
   Subsidiaries of intercompany Indebtedness between or among the Company and
   any of its Restricted Subsidiaries; provided, however, that (i) if the
   Company is the obligor on such Indebtedness, such Indebtedness is expressly
   subordinated to the prior payment in full in cash of all Obligations with
   respect to the Notes and (ii)(A) any subsequent issuance or transfer of
   Equity Interests that results in any such Indebtedness being held by a Person
   other than the Company or a Restricted Subsidiary thereof and (B) any sale or
   other transfer of any such Indebtedness to a Person that is not either the
   Company or a Restricted Subsidiary thereof shall be deemed, in each case, to
   constitute an incurrence of such Indebtedness by the Company or such
   Restricted Subsidiary, as the case may be, that was not permitted by this
   clause (vii);

         (viii) the incurrence by the Company or any of its Restricted
   Subsidiaries of Hedging Obligations that are incurred for the purpose of
   fixing or hedging (i) interest rate risk with respect to any floating rate
   Indebtedness that is permitted by the terms of this Indenture to be
   outstanding, (ii) the value of foreign currencies purchased or received by
   the Company or any Restricted Subsidiary in the ordinary course of business
   as conducted by the Company or (iii) commodity risk relating to commodity
   agreements to the extent entered into in the ordinary course of business
   solely to protect the Company and its Restricted Subsidiaries from
   fluctuations in the prices of raw materials used in its business;

         (ix)   the incurrence by the Company or any of its Restricted
   Subsidiaries of Indebtedness (in addition to Indebtedness permitted by other
   clauses of this Section 4.09) in an aggregate principal amount (or accreted
   value, as applicable) at any time outstanding, including all Permitted
   Refinancing Indebtedness incurred to refund, refinance or replace any
   Indebtedness incurred pursuant to this clause (ix), not to exceed $25.0
   million;

         (x)    the incurrence by the Company's Unrestricted Subsidiaries of 
   Non-Recourse Debt, provided, however, that if any such Indebtedness ceases to
   be Non-Recourse Debt of an Unrestricted Subsidiary, such event shall be
   deemed to constitute an incurrence of Indebtedness by a Restricted Subsidiary
   of the Company that was not permitted by this clause (x);

         (xi)   the Guarantee by the Company or any of the Subsidiary Guarantors
   of Indebtedness of the Company or a Subsidiary Guarantor, which Indebtedness
   was permitted to be incurred by another provision of this Section 4.09;

         (xii)  Indebtedness of the Company or a Restricted Subsidiary owed to
   (including obligations in respect of letters of credit for the benefit of)
   any Person in connection with worker's compensation, health, disability or
   other employee benefits or property, casualty or liability insurance provided
   by such Person to the Company or such Restricted Subsidiary, pursuant to
   reimbursement or indemnification obligations to such Person, in each case
   incurred in the ordinary course of business and consistent with past
   practices;

         (xiii) the incurrence of Permitted Bonding Obligations;

                                       50

 
         (xiv) the issuance of preferred stock (other than Disqualified Stock)
   by any Subsidiary Guarantor to members of management of such Subsidiary
   Guarantor, provided that such preferred stock does not require the Company or
   any Restricted Subsidiary to pay dividends thereon other than in shares of
   additional preferred stock (other than Disqualified Stock); and

         (xv)  the incurrence of Indebtedness arising from agreements of the
   Company or any Restricted Subsidiary providing for indemnification,
   adjustment of purchase price or similar obligations, in each case, incurred
   or assumed in connection with the disposition of any business, assets or
   Capital Stock of a Restricted Subsidiary; provided that the maximum aggregate
   liability of such Indebtedness shall at no time exceed the gross proceeds
   actually received by the Company and its Restricted Subsidiaries in
   connection with any such disposition.

      For purposes of determining compliance with this Section 4.09, in the
event that an item of Indebtedness meets the criteria of more than one of the
categories of Permitted Debt described in clauses (i) through (xv) above or is
entitled to be incurred pursuant to the first paragraph of this Section 4.09,
the Company shall, in its sole discretion, classify such item of Indebtedness in
any manner that complies with this Section 4.09.  Accrual of interest, accretion
or amortization of original issue discount, the payment of interest on any
Indebtedness in the form of additional Indebtedness with the same terms, and the
payment of dividends on Disqualified Stock in the form of additional shares of
the same class of Disqualified Stock shall not be deemed to be an incurrence of
Indebtedness or an issuance of Disqualified Stock for purposes of this Section
4.09; provided, in each such case, that the amount thereof is included in Fixed
Charges of the Company as accrued.

Section 4.10.  Asset Sales.

      The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, consummate an Asset Sale unless (i) the Company (or the
Restricted Subsidiary, as the case may be) receives consideration at the time of
such Asset Sale at least equal to the fair market value (evidenced by a
resolution of the Board of Directors set forth in an Officers' Certificate
delivered to the Trustee) of the assets or Equity Interests issued or sold or
otherwise disposed of and (ii) at least 75% of the consideration therefor
received by the Company or such Restricted Subsidiary is in the form of
Qualified Proceeds; provided that the aggregate fair market value of Qualified
Proceeds (other than cash or Cash Equivalents), which may be received in
consideration for asset sales pursuant to this clause (ii) shall not exceed $5.0
million since the date of this Indenture; provided further that the amount of
(x) any liabilities (as shown on the Company's or such Restricted Subsidiary's
most recent balance sheet), of the Company or any Restricted Subsidiary (other
than contingent liabilities and liabilities that are by their terms subordinated
to the Notes or any guarantee thereof) that are assumed by the transferee of any
such assets pursuant to a customary novation agreement that releases the Company
or such Restricted Subsidiary from further liability and (y) any securities,
Notes or other obligations received by the Company or any such Restricted
Subsidiary from such transferee that are converted by the Company or such
Restricted Subsidiary into cash (to the extent of the cash received) within 90
days following the closing of such Asset Sale, shall be deemed to be cash for
purposes of this provision, provided further that the 75% limitation referred to
above shall not apply to any Asset Sale in which the cash and Cash Equivalents
portion of the consideration received therefor, determined in accordance with
the foregoing 

                                       51

 
proviso, is equal to or greater than what the net after-tax proceeds would have
been had such Asset Sale complied with the aforementioned 75% limitation.

      Within 360 days after the receipt of any Net Proceeds from an Asset Sale,
the Company or any Restricted Subsidiary may apply such Net Proceeds, at its
option, (a) to repay Senior Debt, (b) to the acquisition of a majority of the
assets of, or a majority of the Voting Stock of, another Permitted Business, the
making of a capital expenditure or the acquisition or commitment to acquire
(provided that such commitment or a reasonable replacement thereof is
consummated substantially in accordance with the terms thereof) of other assets
that are used or useful in a Permitted Business or (c) for a combination of uses
described in clauses (a) and (b).  Pending the final application of any such Net
Proceeds, the Company and its Restricted Subsidiaries may temporarily reduce
revolving credit borrowings or otherwise invest such Net Proceeds in any manner
that is not prohibited by this Indenture.  Any Net Proceeds from Asset Sales
that are not applied or invested as provided in the first sentence of this
Section 4.10 shall be deemed to constitute "Excess Proceeds."  Within five days
of each date on which the aggregate amount of Excess Proceeds exceeds $10.0
million, the Company shall make an Asset Sale Offer to purchase the maximum
principal amount of Notes that may be purchased out of the Excess Proceeds, at
an offer price in cash in an amount equal to 100% of the principal amount
thereof plus accrued and unpaid interest and Liquidated Damages thereon, if any,
to the date of repurchase, in accordance with the procedures set forth in
Section 3.09 hereof.  To the extent that any Excess Proceeds remain after
consummation of an Asset Sale Offer, the Company may use such Excess Proceeds
for any general corporate purpose.  If the aggregate principal amount of Notes
tendered into such Asset Sale Offer surrendered by Holders thereof exceeds the
amount of Excess Proceeds, the Trustee shall select the Notes to be purchased on
a pro rata basis.  Upon completion of each Asset Sale Offer, the amount of
Excess Proceeds shall be reset to zero.

Section 4.11.  Transactions with Affiliates.

      The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, make any payment to, or sell, lease, transfer or otherwise
dispose of any of its properties or assets to, or purchase any property or
assets from, or enter into or make or amend any transaction, contract,
agreement, understanding, loan, advance or guarantee with, or for the benefit
of, any Affiliate (each of the foregoing, an "Affiliate Transaction"), unless
(i) such Affiliate Transaction is on terms that are no less favorable to the
Company or the relevant Restricted Subsidiary than those that would have been
obtained in a comparable transaction by the Company or such Restricted
Subsidiary with an unrelated Person and (ii) the Company delivers to the Trustee
(a) with respect to any Affiliate Transaction or series of related Affiliate
Transactions involving aggregate consideration in excess of $2.0 million, a
resolution of the Board of Directors of the Company set forth in an Officers'
Certificate certifying that such Affiliate Transaction complies with clause (i)
above and that such Affiliate Transaction has been approved by a majority of the
disinterested members of the Board of Directors of the Company and (b) with
respect to any Affiliate Transaction or series of related Affiliate Transactions
involving aggregate consideration in excess of $7.5 million, an opinion as to
the fairness to the Holders of such Affiliate Transaction from a financial point
of view issued by an accounting, appraisal or investment banking firm of
national standing.  Notwithstanding the foregoing, the following items shall not
be deemed to be Affiliate Transactions: (i) any employment agreement,
compensation, employee benefit arrangements and incentive arrangements or
indemnification agreement or arrangement with any officer, director, member 

                                       52

 
or employee entered into by the Company or any of its Restricted Subsidiaries in
the ordinary course of business of the Company or such Restricted Subsidiary,
(ii) transactions between or among the Company and/or its Restricted
Subsidiaries, (iii) payment of reasonable directors fees, (iv) Restricted
Payments (other than Restricted Investments) that are permitted by the
provisions of Section 4.07 hereof, (v) loans and advances to officers, directors
and employees of the Company or any Restricted Subsidiary for travel,
entertainment, moving and other relocation expenses, in each case made in the
ordinary course of business; and (vi) transactions pursuant to the Stockholders'
Agreement and the Merger Agreement, in each case, as in effect on the date of
this Indenture as the same may be amended, modified or replaced from time to
time so long as such amendment, modification or replacement is no less favorable
to the Company and its Restricted Subsidiaries, taken as a whole, than the
Stockholders' Agreement or the Merger Agreement, as the case may be, as in
effect on the date of this Indenture.

Section 4.12.  Liens.

      The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly, create, incur, assume or suffer to
exist any Lien securing Indebtedness or trade payables on any asset now owned or
hereafter acquired, or any income or profits therefrom or assign or convey any
right to receive income therefrom, except (i) Permitted Liens, and (ii) in the
case of Liens securing Indebtedness that is expressly subordinate or junior in
right of payment to the Notes, the Notes are secured by a Lien on such property,
assets or proceeds that is senior in priority to such Liens (with the same
relative priority as such subordinate or junior Indebtedness shall have with
respect to the Notes and the Subsidiary Guarantees) and (y) in all other cases,
the Notes are secured by such Lien on an equal and ratable basis.

Section 4.13.  Business Activities.

      The Company shall not, and shall not permit any Restricted Subsidiary to,
engage in any business other than Permitted Businesses, except to such extent as
would not be material to the Company and its Restricted Subsidiaries taken as a
whole.

Section 4.14.  Corporate Existence.

      Subject to Article 5 hereof, the Company shall do or cause to be done all
things necessary to preserve and keep in full force and effect (i) its corporate
existence, and the corporate, partnership or other existence of each of its
Restricted Subsidiaries, in accordance with the respective organizational
documents (as the same may be amended from time to time) of the Company or any
such Restricted Subsidiary and (ii) the rights (charter and statutory), licenses
and franchises of the Company and its Restricted Subsidiaries; provided,
however, that the Company shall not be required to preserve any such right,
license or franchise, or the corporate, partnership or other existence of any of
its Restricted Subsidiaries, if the Board of Directors shall determine that the
preservation thereof is no longer desirable in the conduct of the business of
the Company and its Restricted Subsidiaries, taken as a whole, and that the loss
thereof is not adverse in any material respect to the Company and its Restricted
Subsidiaries taken as a whole.

                                       53

 
Section 4.15.  Offer to Repurchase Upon Change of Control.

      (a) Upon the occurrence of a Change of Control, the Company shall make an
offer (a "Change of Control Offer") to each Holder to repurchase all or any part
(equal to $1,000 or an integral multiple thereof) of each Holder's Notes at a
purchase price equal to 101% of the aggregate principal amount thereof plus
accrued and unpaid interest and Liquidated Damages thereon, if any, to the date
of purchase (the "Change of Control Payment").  Within 30 days following any
Change of Control, the Company shall mail a notice to each Holder stating: (1)
that the Change of Control Offer is being made pursuant to this Section 4.15 and
that all Notes tendered will be accepted for payment; (2) the purchase price and
the purchase date, which shall be no earlier than 30 days and no later than 60
days from the date such notice is mailed (the "Change of Control Payment Date");
(3) that any Note not tendered will continue to accrue interest; (4) that,
unless the Company defaults in the payment of the Change of Control Payment, all
Notes accepted for payment pursuant to the Change of Control Offer shall cease
to accrue interest after the Change of Control Payment Date; (5) that Holders
electing to have any Notes purchased pursuant to a Change of Control Offer will
be required to surrender the Notes, with the form entitled "Option of Holder to
Elect Purchase" on the reverse of the Notes completed, to the Paying Agent at
the address specified in the notice prior to the close of business on the third
Business Day preceding the Change of Control Payment Date; (6) that Holders will
be entitled to withdraw their election if the Paying Agent receives, not later
than the close of business on the second Business Day preceding the Change of
Control Payment Date, a facsimile transmission or letter setting forth the name
of the Holder, the principal amount of Notes delivered for purchase, and a
statement that such Holder is withdrawing his election to have the Notes
purchased; and (7) that Holders whose Notes are being purchased only in part
will be issued new Notes equal in principal amount to the unpurchased portion of
the Notes surrendered, which unpurchased portion must be equal to $1,000 in
principal amount or an integral multiple thereof.  The Company shall comply with
the requirements of Rule 14e-1 under the Exchange Act and any other securities
laws and regulations thereunder to the extent such laws and regulations are
applicable in connection with the repurchase of Notes in connection with a
Change of Control.  To the extent that the provisions of any securities laws or
regulations directly conflict with the provisions hereof, the Company shall
comply with the applicable securities laws and regulations and shall not be
deemed to have breached its obligations described herein by virtue thereof.

      (b) On the Change of Control Payment Date, the Company shall, to the
extent lawful, (1) accept for payment all Notes or portions thereof properly
tendered pursuant to the Change of Control Offer, (2) deposit with the Paying
Agent an amount equal to the Change of Control Payment in respect of all Notes
or portions thereof so tendered and (3) deliver or cause to be delivered to the
Trustee the Notes so accepted together with an Officers' Certificate stating the
aggregate principal amount of Notes or portions thereof being purchased by the
Company.  The Paying Agent will promptly mail to each Holder of Notes so
tendered the Change of Control Payment for such Notes, and the Trustee will
promptly authenticate and mail (or cause to be transferred by book entry) to
each Holder a new Note equal in principal amount to any unpurchased portion of
the Notes surrendered, if any; provided that each such new Note will be in a
principal amount of $1,000 or an integral multiple thereof. The Company shall
publicly announce the results of the Change of Control Offer on or as soon as
practicable after the Change of Control Payment Date.

                                       54

 
      (c) Notwithstanding anything to the contrary in this Section 4.15, the
Company shall not be required to make a Change of Control Offer upon a Change of
Control if a third party makes the Change of Control Offer in the manner, at the
times and otherwise in compliance with the requirements set forth in this
Section 4.15 and Section 3.09 hereof made by the Company and purchases all Notes
validly tendered and not withdrawn under such Change of Control Offer.

      (d) Prior to complying with the provisions of this Section 4.15, but in
any event within 90 days following a Change of Control, the Company shall either
repay all outstanding Senior Debt or obtain the requisite consents, if any,
under the agreements governing outstanding Senior Debt to permit the repurchase
of Notes required by this Section 4.15.

Section 4.16.  No Senior Subordinated Debt.

      The Company shall not incur, create, issue, assume, guarantee or otherwise
become liable for any Indebtedness that is subordinate or junior in right of
payment to any Indebtedness and senior in any respect in right of payment to the
Notes, and no Subsidiary Guarantor shall incur, create, issue, assume, guarantee
or otherwise become liable for any Indebtedness that is subordinate or junior in
right of payment to any Indebtedness of such Subsidiary Guarantor and senior in
any respect in right of payment to the Subsidiary Guarantee of such Subsidiary
Guarantor; provided that no Indebtedness shall be deemed subordinate or junior
in right of payment to any other Indebtedness solely by reason of the fact that
such Indebtedness is unsecured.

Section 4.17.  Limitation on Sale and Leaseback Transactions.

      The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, enter into any sale and leaseback transaction; provided that
the Company or any of its Restricted Subsidiaries may enter into a sale and
leaseback transaction if (i) the Company or such Restricted Subsidiary could
have (a) incurred Indebtedness in an amount equal to the Attributable Debt
relating to such sale and leaseback transaction pursuant to Section 4.09 hereof
and (b) incurred a Lien to secure such Indebtedness pursuant to Section 4.12
hereof, (ii) the gross cash proceeds of such sale and leaseback transaction are
at least equal to the fair market value (as determined in good faith by the
Board of Directors of the Company and set forth in an Officers' Certificate
delivered to the Trustee) of the property that is the subject of such sale and
leaseback transaction and (iii) the transfer of assets in such sale and
leaseback transaction is permitted by, and if applicable, the Company applies
the proceeds of such transaction in compliance with Section 4.10 hereof.
Notwithstanding the foregoing, this covenant shall not apply to the sale and
leaseback of (i) the backhoe dredge "New York" under construction on the date of
the Indenture or (ii) the dredging assets acquired from T.L. James & Company,
Inc. pursuant to the acquisition agreement in effect on the date of the
Indenture, as such agreement is in effect on such date, in the case of clauses
(i) and (ii), within 120 days of the date of completion of such construction or
acquisition of such assets, as applicable.

Section 4.18.  Limitation on Issuances of Guarantees of Indebtedness.

      The Company shall not permit any Restricted Subsidiary, directly or
indirectly, to Guarantee any other Indebtedness of the Company or a Subsidiary
Guarantor unless, if such Restricted Subsidiary is 

                                       55

 
not a Guarantor, such Restricted Subsidiary simultaneously executes and delivers
a supplemental indenture to this Indenture providing for the Guarantee of the
payment of the Notes by such Restricted Subsidiary, which Guarantee shall be
senior to or pari passu with such Subsidiary's Guarantee of such other
Indebtedness unless such other Indebtedness is Senior Debt, in which case the
Guarantee of the Notes may be subordinated to the Guarantee of such Senior Debt
to the same extent as the Notes are subordinated to such Senior Debt.
Notwithstanding the foregoing, any such Subsidiary Guarantee shall provide by
its terms that it shall be automatically and unconditionally released and
discharged upon any sale, exchange or transfer, to any Person not an Affiliate
of the Company, of all of the Company's stock in, or all or substantially all
the assets of, such Restricted Subsidiary, which sale, exchange or transfer is
made in compliance with the applicable provisions hereof. The form of such
Subsidiary Guarantee is attached as Exhibit E hereto.

Section 4.19.  Payments for Consent.

      Neither the Company nor any of its Restricted Subsidiaries shall, directly
or indirectly, pay or cause to be paid any consideration, whether by way of
interest, fee or otherwise, to any Holder of any Notes for or as an inducement
to any consent, waiver or amendment of any of the terms or provisions of this
Indenture or the Notes unless such consideration is offered to be paid or is
paid to all Holders of the Notes that consent, waive or agree to amend in the
time frame set forth in the solicitation documents relating to such consent,
waiver or agreement.

Section 4.20.  Additional Subsidiary Guarantees.

      If the Company or any of its Restricted Subsidiaries shall acquire or
create another domestic Subsidiary after the date of this Indenture, then,
unless such Subsidiary is properly designated as an Unrestricted Subsidiary,
such newly acquired or created Subsidiary shall become a Subsidiary Guarantor
and execute a supplemental indenture and deliver an Opinion of Counsel, in
accordance with the terms of this Indenture.  The form of such Subsidiary
Guarantee is attached as Exhibit E hereto.

                                   ARTICLE 5
                                   SUCCESSORS

Section 5.01.  Merger, Consolidation, or Sale of Assets.

      The Company shall not consolidate or merge with or into (whether or not
the Company is the surviving corporation), or sell, assign, transfer, convey or
otherwise dispose of all or substantially all of its properties or assets in one
or more related transactions, to another Person unless (i) the Company is the
surviving corporation or the entity or the Person formed by or surviving any
such consolidation or merger (if other than the Company) or to which such sale,
assignment, transfer, lease, conveyance or other disposition shall have been
made is a corporation or other entity organized or existing under the laws of
the United States, any state thereof or the District of Columbia; (ii) the
entity or Person formed by or surviving any such consolidation or merger (if
other than the Company) or the entity or Person to which such sale, assignment,
transfer, lease, conveyance or other disposition shall have been made assumes
all the then existing obligations of the Company under the Registration Rights
Agreement, the 

                                       56

 
Notes and this Indenture pursuant to a supplemental indenture in a form
reasonably satisfactory to the Trustee; (iii) immediately after such transaction
no Default or Event of Default exists; and (iv) except in the case of a merger
of the Company with or into a Wholly Owned Subsidiary of the Company, the
Company or the Person formed by or surviving any such consolidation or merger
(if other than the Company), or to which such sale, assignment, transfer, lease,
conveyance or other disposition shall have been made will, at the time of such
transaction and after giving pro forma effect thereto as if such transaction had
occurred at the beginning of the applicable four-quarter period, be permitted to
incur at least $1.00 of additional Indebtedness pursuant to the Fixed Charge
Coverage Ratio test set forth in the first paragraph of Section 4.09 hereof. The
Company shall not, directly or indirectly, lease all or substantially all of its
properties or assets to any Person.

Section 5.02.  Successor Corporation Substituted.

      Upon any consolidation or merger, or any sale, assignment, transfer,
lease, conveyance or other disposition of all or substantially all of the assets
of the Company in accordance with Section 5.01 hereof, the successor corporation
formed by such consolidation or into or with which the Company is merged or to
which such sale, assignment, transfer, lease, conveyance or other disposition is
made shall succeed to, and be substituted for (so that from and after the date
of such consolidation, merger, sale, lease, conveyance or other disposition, the
provisions of this Indenture referring to the "Company" shall refer instead to
the successor corporation and not to the Company), and may exercise every right
and power of the Company under this Indenture with the same effect as if such
successor Person had been named as the Company herein; provided, however, that
the predecessor Company shall not be relieved from the obligation to pay the
principal of and interest on the Notes except in the case of a sale of all of
the Company's assets that meets the requirements of Section 5.01 hereof.

                                   ARTICLE 6
                             DEFAULTS AND REMEDIES

Section 6.01.  Events of Default.

      An "Event of Default" occurs if:

      (a) the Company defaults in the payment when due of interest on, or
Liquidated Damages with respect to, the Notes (whether or not permitted by
Article 10 hereof) and such default continues for a period of 30 days;

      (b) the Company defaults in the payment when due of principal of or
premium, if any, on the Notes (whether or not permitted by the provisions of
Article 10 hereof) when the same becomes due and payable at maturity, upon
redemption (including in connection with an offer to purchase) or otherwise;

      (c) the Company or any of its Restricted Subsidiaries fails to comply with
any of the provisions of 4.15 hereof;

      (d) the Company or any of its Restricted Subsidiaries fails to observe or
perform any other covenant, representation, warranty or other agreement in this
Indenture or the Notes for 60 days after 

                                       57

 
notice to the Company by the Trustee or the Holders of at least 25% in aggregate
principal amount of the Notes (including Additional Notes, if any) then
outstanding voting as a single class;

      (e) a default occurs under any mortgage, indenture or instrument under
which there may be issued or by which there may be secured or evidenced any
Indebtedness for money borrowed by the Company or any of its Restricted
Subsidiaries (or the payment of which is guaranteed by the Company or any of its
Restricted Subsidiaries) whether such Indebtedness or guarantee now exists, or
is created after the date hereof, which default (i) is caused by a failure to
pay principal of or premium, if any, or interest on such Indebtedness prior to
the expiration of the grace period provided in such Indebtedness on the date of
such default (a "Payment Default") or (ii) results in the acceleration of such
Indebtedness prior to its stated maturity and, in each case, the principal
amount of any such Indebtedness, together with the principal amount of any other
such Indebtedness under which there has been a Payment Default or the maturity
of which has been so accelerated (after giving effect to any applicable grace
period), aggregates $10.0 million or more;

      (f) the Company or any of its Restricted Subsidiaries fails to pay final
judgments aggregating in excess  of $10.0 million (net of any amount with
respect to which a reputable insurance company with assets over $100.0 million
has acknowledged liability in writing), which judgments are not paid, discharged
or stayed for a period of 60 days after their entry;

      (g) the Company or any of its Subsidiaries or any group of Subsidiaries
that, taken as a whole, would constitute a Significant Subsidiary pursuant to or
within the meaning of Bankruptcy Law:

          (i)   commences a voluntary case,

          (ii)  consents to the entry of an order for relief against it in an
   involuntary case,

          (iii) consents to the appointment of a custodian of it or for all or
   substantially all of its property,

          (iv)  makes a general assignment for the benefit of its creditors, or

          (v)   generally is not paying its debts as they become due; or

      (h) a court of competent jurisdiction enters an order or decree under any
Bankruptcy Law that:

          (i)   is for relief against the Company or any of its Significant
   Subsidiaries or any group of Subsidiaries that, taken as a whole, would
   constitute a Significant Subsidiary in an involuntary case;

          (ii)  appoints a custodian of the Company or any of its Significant
   Subsidiaries or any group of Subsidiaries that, taken as a whole, would
   constitute a Significant Subsidiary or for all or substantially all of the
   property of the Company or any of its Significant Subsidiaries or any group
   of Subsidiaries that, taken as a whole, would constitute a Significant
   Subsidiary; or

                                       58

 
          (iii)  orders the liquidation of the Company or any of its Significant
   Subsidiaries or any group of Subsidiaries that, taken as a whole, would
   constitute a Significant Subsidiary;

and the order or decree remains unstayed and in effect for 60 consecutive days;
or

      (i) except as permitted by this Indenture, any Subsidiary Guarantee is
held in any judicial proceeding to be unenforceable or invalid or shall cease
for any reason to be in full force and effect or any Subsidiary Guarantor, or
any Person acting on behalf of any Subsidiary Guarantor, shall deny or disaffirm
its obligations under such Subsidiary Guarantor's Subsidiary Guarantee.

Section 6.02.  Acceleration.

      If any Event of Default (other than an Event of Default specified in
clause (g) or (h) of Section 6.01 hereof with respect to the Company, any
Significant Subsidiary or any group of Significant Subsidiaries that, taken as a
whole, would constitute a Significant Subsidiary) occurs and is continuing, the
Trustee or the Holders of at least 25% in principal amount of the then
outstanding Notes may declare all the Notes to be due and payable immediately.
Notwithstanding the foregoing, if an Event of Default specified in clause (g) or
(h) of Section 6.01 hereof occurs with respect to the Company, any of its
Significant Subsidiaries or any group of Subsidiaries that, taken as a whole,
would constitute a Significant Subsidiary, all outstanding Notes shall be due
and payable immediately without further action or notice.  The Holders of a
majority in aggregate principal amount of the then outstanding Notes by written
notice to the Trustee may on behalf of all of the Holders rescind an
acceleration and its consequences if the rescission would not conflict with any
judgment or decree and if all existing Events of Default (except nonpayment of
principal, interest or premium that has become due solely because of the
acceleration) have been cured or waived.

Section 6.03.  Other Remedies.

      If an Event of Default occurs and is continuing, the Trustee may pursue
any available remedy to collect the payment of principal, premium, if any, and
interest on the Notes or to enforce the performance of any provision of the
Notes or this Indenture.

      The Trustee may maintain a proceeding even if it does not possess any of
the Notes or does not produce any of them in the proceeding.  A delay or
omission by the Trustee or any Holder of a Note in exercising any right or
remedy accruing upon an Event of Default shall not impair the right or remedy or
constitute a waiver of or acquiescence in the Event of Default.  All remedies
are cumulative to the extent permitted by law.

Section 6.04.  Waiver of Past Defaults.

      Holders of not less than a majority in aggregate principal amount of the
then outstanding Notes by notice to the Trustee may on behalf of the Holders of
all of the Notes waive an existing Default or Event of Default and its
consequences hereunder, except a continuing Default or Event of Default in the
payment of the principal of, premium and Liquidated Damages, if any, or interest
on, the Notes (including in connection with an offer to purchase) (provided,
however, that the Holders of a majority in 

                                       59

 
aggregate principal amount of the then outstanding Notes may rescind an
acceleration and its consequences, including any related payment default that
resulted from such acceleration). Upon any such waiver, such Default shall cease
to exist, and any Event of Default arising therefrom shall be deemed to have
been cured for every purpose of this Indenture; but no such waiver shall extend
to any subsequent or other Default or impair any right consequent thereon.

Section 6.05.  Control by Majority.

      Holders of a majority in principal amount of the then outstanding Notes
may direct the time, method and place of conducting any proceeding for
exercising any remedy available to the Trustee or exercising any trust or power
conferred on it.  However, the Trustee may refuse to follow any direction that
conflicts with law or this Indenture that the Trustee determines may be unduly
prejudicial to the rights of other Holders of Notes or that may involve the
Trustee in personal liability.

Section 6.06.  Limitation on Suits.

      A Holder of a Note may pursue a remedy with respect to this Indenture or
the Notes only if:

      (a) the Holder of a Note gives to the Trustee written notice of a
continuing Event of Default;

      (b) the Holders of at least 25% in principal amount of the then
outstanding Notes make a written request to the Trustee to pursue the remedy;

      (c) such Holder of a Note or Holders of Notes offer and, if requested,
provide to the Trustee indemnity satisfactory to the Trustee against any loss,
liability or expense;

      (d) the Trustee does not comply with the request within 60 days after
receipt of the request and the offer and, if requested, the provision of
indemnity; and

      (e) during such 60-day period the Holders of a majority in principal
amount of the then outstanding Notes do not give the Trustee a direction
inconsistent with the request.

      A Holder of a Note may not use this Indenture to prejudice the rights of
another Holder of a Note or to obtain a preference or priority over another
Holder of a Note.

Section 6.07.  Rights of Holders of Notes to Receive Payment.

      Notwithstanding any other provision of this Indenture, the right of any
Holder of a Note to receive payment of principal, premium and Liquidated
Damages, if any, and interest on the Note, on or after the respective due dates
expressed in the Note (including in connection with an offer to purchase), or to
bring suit for the enforcement of any such payment on or after such respective
dates, shall not be impaired or affected without the consent of such Holder.

                                       60

 
Section 6.08.  Collection Suit by Trustee.

      If an Event of Default specified in Section 6.01(a) or (b) occurs and is
continuing, the Trustee is authorized to recover judgment in its own name and as
trustee of an express trust against the Company for the whole amount of
principal of, premium and Liquidated Damages, if any, and interest remaining
unpaid on the Notes and interest on overdue principal and, to the extent lawful,
interest and such further amount as shall be sufficient to cover the costs and
expenses of collection, including the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel.

Section 6.09.  Trustee May File Proofs of Claim.

      The Trustee is authorized to file such proofs of claim and other papers or
documents as may be necessary or advisable in order to have the claims of the
Trustee (including any claim for the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel) and the
Holders of the Notes allowed in any judicial proceedings relative to the Company
(or any other obligor upon the Notes), its creditors or its property and shall
be entitled and empowered to collect, receive and distribute any money or other
property payable or deliverable on any such claims and any custodian in any such
judicial proceeding is hereby authorized by each Holder to make such payments to
the Trustee, and in the event that the Trustee shall consent to the making of
such payments directly to the Holders, to pay to the Trustee any amount due to
it for the reasonable compensation, expenses, disbursements and advances of the
Trustee, its agents and counsel, and any other amounts due the Trustee under
Section 7.07 hereof.  To the extent that the payment of any such compensation,
expenses, disbursements and advances of the Trustee, its agents and counsel, and
any other amounts due the Trustee under Section 7.07 hereof out of the estate in
any such proceeding, shall be denied for any reason, payment of the same shall
be secured by a Lien on, and shall be paid out of, any and all distributions,
dividends, money, securities and other properties that the Holders may be
entitled to receive in such proceeding whether in liquidation or under any plan
of reorganization or arrangement or otherwise.  Nothing herein contained shall
be deemed to authorize the Trustee to authorize or consent to or accept or adopt
on behalf of any Holder any plan of reorganization, arrangement, adjustment or
composition affecting the Notes or the rights of any Holder, or to authorize the
Trustee to vote in respect of the claim of any Holder in any such proceeding.

Section 6.10.  Priorities.

      If the Trustee collects any money pursuant to this Article, it shall pay
out the money in the following order:

         First:  to the Trustee, its agents and attorneys for amounts due under
   Section 7.07 hereof, including payment of all compensation, expense and
   liabilities incurred, and all advances made, by the Trustee and the costs and
   expenses of collection;

         Second:  to Holders of Notes for amounts due and unpaid on the Notes
   for principal, premium and Liquidated Damages, if any, and interest, ratably,
   without preference or priority of any kind, according to the amounts due and
   payable on the Notes for principal, premium and Liquidated Damages, if any
   and interest, respectively; and

                                       61

 
         Third:  to the Company or to such party as a court of competent
   jurisdiction shall direct.

      The Trustee may fix a record date and payment date for any payment to
Holders of Notes pursuant to this Section 6.10.

Section 6.11.  Undertaking for Costs.

      In any suit for the enforcement of any right or remedy under this
Indenture or in any suit against the Trustee for any action taken or omitted by
it as a Trustee, a court in its discretion may require the filing by any party
litigant in the suit of an undertaking to pay the costs of the suit, and the
court in its discretion may assess reasonable costs, including reasonable
attorneys' fees, against any party litigant in the suit, having due regard to
the merits and good faith of the claims or defenses made by the party litigant.
This Section does not apply to a suit by the Trustee, a suit by a Holder of a
Note pursuant to Section 6.07 hereof, or a suit by Holders of more than 10% in
principal amount of the then outstanding Notes.

                                   ARTICLE 7
                                    TRUSTEE

Section 7.01.  Duties of Trustee.

      (a)    If an Event of Default has occurred and is continuing, the Trustee
shall exercise such of the rights and powers vested in it by this Indenture, and
use the same degree of care and skill in its exercise, as a prudent person would
exercise or use under the circumstances in the conduct of such person's own
affairs.

      (b)    Except during the continuance of an Event of Default:

      (i)    the duties of the Trustee shall be determined solely by the express
provisions of this Indenture and the Trustee need perform only those duties that
are specifically set forth in this Indenture and no others, and no implied
covenants or obligations shall be read into this Indenture against the Trustee;
and

      (ii)   in the absence of bad faith on its part, the Trustee may
conclusively rely, as to the truth of the statements and the correctness of the
opinions expressed therein, upon certificates or opinions furnished to the
Trustee and conforming to the requirements of this Indenture. However, the
Trustee shall examine the certificates and opinions to determine whether or not
they conform to the requirements of this Indenture.

      (c)    The Trustee may not be relieved from liabilities for its own
negligent action, its own negligent failure to act, or its own willful
misconduct, except that:

      (i)    this paragraph does not limit the effect of paragraph (b) of this
Section 7.01;

                                       62

 
      (ii)   the Trustee shall not be liable for any error of judgment made in
good faith by a Responsible Officer, unless it is proved that the Trustee was
negligent in ascertaining the pertinent facts; and

      (iii)  the Trustee shall not be liable with respect to any action it takes
or omits to take in good faith in accordance with a direction received by it
pursuant to Section 6.05 hereof.

      (d)    Whether or not therein expressly so provided, every provision of
this Indenture that in any way relates to the Trustee is subject to paragraphs
(a), (b), and (c) of this Section 7.01.

      (e)    No provision of this Indenture shall require the Trustee to expend
or risk its own funds or incur any liability. The Trustee shall be under no
obligation to exercise any of its rights and powers under this Indenture at the
request of any Holders, unless such Holder shall have offered to the Trustee
security and indemnity satisfactory to it against any loss, liability or
expense.

      (f)    The Trustee shall not be liable for interest on any money received
by it except as the Trustee may agree in writing with the Company. Money held in
trust by the Trustee need not be segregated from other funds except to the
extent required by law.

Section 7.02.  Rights of Trustee.

      (a) The Trustee may conclusively rely upon any document believed by it to
be genuine and to have been signed or presented by the proper Person.  The
Trustee need not investigate any fact or matter stated in the document.

      (b) Before the Trustee acts or refrains from acting, it may require an
Officers' Certificate or an Opinion of Counsel or both.  The Trustee shall not
be liable for any action it takes or omits to take in good faith in reliance on
such Officers' Certificate or Opinion of Counsel.  The Trustee may consult with
counsel and the advice of such counsel or any Opinion of Counsel shall be full
and complete authorization and protection from liability in respect of any
action taken, suffered or omitted by it hereunder in good faith and in reliance
thereon.

      (c) The Trustee may act through its attorneys and agents and shall not be
responsible for the misconduct or negligence of any agent appointed with due
care.

      (d) The Trustee shall not be liable for any action it takes or omits to
take in good faith that it believes to be authorized or within the rights or
powers conferred upon it by this Indenture; provided, that the Trustee's conduct
does not constitute willful misconduct or negligence.

      (e) Unless otherwise specifically provided in this Indenture, any demand,
request, direction or notice from the Company shall be sufficient if signed by
an Officer of the Company.

      (f) The Trustee shall be under no obligation to exercise any of the rights
or powers vested in it by this Indenture at the request or direction of any of
the Holders unless such Holders shall have offered to the Trustee reasonable
security or indemnity against the costs, expenses and liabilities that might be
incurred by it in compliance with such request or direction.

                                       63

 
      (g) The Trustee shall not be bound to make any investigation into the
facts or matters stated in any resolution, certificate, statement, instrument,
opinion, report, notice, request, direction, consent, order, bond, debenture,
note, other evidence of indebtedness or other paper or document, but the
Trustee, in its reasonable discretion, may make such further inquiry or
investigation into such facts or matters as it may see fit, and, if the Trustee
shall reasonably determine to make such further inquiry or investigation, it
shall be entitled to examine the books, records and premises of the Company
during normal business hours and upon reasonable notice, personally or by agent
or attorney at the sole cost of the Company and shall incur no liability or
additional liability of any kind by reason of such inquiry or investigation;

      (h) The Trustee may execute any of the trusts or powers hereunder or
perform any duties hereunder either directly or by or through agents or
attorneys and the Trustee shall not be responsible for any willful misconduct or
gross negligence on the part of any agent or attorney appointed with due care by
it hereunder;

      (i) The Trustee shall not be deemed to have notice of any Default or Event
of Default unless  a Responsible Officer of the Trustee has actual knowledge
thereof or unless written notice of any event which is in fact such a default is
received by the Trustee at the Corporate Trust Office of the Trustee, and such
notice references the Notes and this Indenture; and

      (j) The rights, privileges, protections, immunities and benefits given to
the Trustee, including, without limitation, its right to be indemnified, are
extended to, and shall be enforceable by, the Trustee in each of its capacities
hereunder, and to each agent, custodian and other Person employed to act
hereunder.

Section 7.03.  Individual Rights of Trustee.

      The Trustee in its individual or any other capacity may become the owner
or pledgee of Notes and may otherwise deal with the Company or any Affiliate of
the Company with the same rights it would have if it were not Trustee.  However,
in the event that the Trustee acquires any conflicting interest it must
eliminate such conflict within 90 days, apply to the SEC for permission to
continue as trustee or resign.  Any Agent may do the same with like rights and
duties.  The Trustee is also subject to Sections 7.10 and 7.11 hereof.

Section 7.04.  Trustee's Disclaimer.

      The Trustee shall not be responsible for and makes no representation as to
the validity or adequacy of this Indenture or the Notes, it shall not be
accountable for the Company's use of the proceeds from the Notes or any money
paid to the Company or upon the Company's direction under any provision of this
Indenture, it shall not be responsible for the use or application of any money
received by any Paying Agent other than the Trustee, and it shall not be
responsible for any statement or recital herein or any statement in the Notes or
any other document in connection with the sale of the Notes or pursuant to this
Indenture other than its certificate of authentication.

                                       64

 
Section 7.05.  Notice of Defaults.

      If a Default or Event of Default occurs and is continuing and if it is
actually known to the Trustee, the Trustee shall mail to Holders of Notes a
notice of the Default or Event of Default within 90 days after it occurs. Except
in the case of a Default or Event of Default in payment of principal of,
premium, if any, or interest on any Note, the Trustee may withhold the notice if
and so long as a committee of its Responsible Officers in good faith determines
that withholding the notice is in the interests of the Holders of the Notes.

Section 7.06.  Reports by Trustee to Holders of the Notes.

      Within 60 days after each May 15 beginning with the May 15 following the
date of this Indenture, and for so long as Notes remain outstanding, the Trustee
shall mail to the Holders of the Notes a brief report dated as of such reporting
date that complies with TIA (S) 313(a) (but if no event described in TIA (S)
313(a) has occurred within the twelve months preceding the reporting date, no
report need be transmitted).  The Trustee also shall comply with TIA (S)
313(b)(2).  The Trustee shall also transmit by mail all reports as required by
TIA (S) 313(c).

      A copy of each report at the time of its mailing to the Holders of Notes
shall be mailed to the Company and filed with the SEC and each stock exchange on
which the Notes are listed in accordance with TIA (S) 313(d).  The Company shall
promptly notify the Trustee when the Notes are listed on any stock exchange and
any delisting thereof.

Section 7.07.  Compensation and Indemnity.

      The Company shall pay to the Trustee from time to time reasonable
compensation for its acceptance of this Indenture and services hereunder as the
Company and the Trustee shall from time to time agree in writing.  The Trustee's
compensation shall not be limited by any law on compensation of a trustee of an
express trust.  The Company shall reimburse the Trustee promptly upon request
for all reasonable disbursements, advances and expenses incurred or made by it
in addition to the compensation for its services.  Such expenses shall include
the reasonable compensation, disbursements and expenses of the Trustee's agents
and counsel.

      The Company shall indemnify the Trustee against any and all losses,
liabilities or expenses incurred by it arising out of or in connection with the
acceptance or administration of its duties under this Indenture, including the
costs and expenses of enforcing this Indenture against the Company (including
this Section 7.07) and defending itself against any claim (whether asserted by
the Company or any Holder or any other person) or liability in connection with
the exercise or performance of any of its powers or duties hereunder, except to
the extent any such loss, liability or expense may be attributable to its
negligence or bad faith.  The Trustee shall notify the Company promptly of any
claim for which it may seek indemnity.  Failure by the Trustee to so notify the
Company shall not relieve the Company of its obligations hereunder.  The Company
shall defend the claim and the Trustee shall cooperate in the defense.  The
Trustee may have separate counsel and the Company shall pay the reasonable fees
and expenses of such counsel.  The Company need not pay for any settlement made
without its consent, which consent shall not be unreasonably withheld.

                                       65

 
      The obligations of the Company under this Section 7.07 shall survive the
satisfaction and discharge of this Indenture.

      To secure the Company's payment obligations in this Section, the Trustee
shall have a Lien prior to the Notes on all money or property held or collected
by the Trustee, except that held in trust to pay principal and interest on
particular Notes. Such Lien shall survive the satisfaction and discharge of this
Indenture.

      When the Trustee incurs expenses or renders services after an Event of
Default specified in Section 6.01(g) or (h) hereof occurs, the expenses and the
compensation for the services (including the fees and expenses of its agents and
counsel) are intended to constitute expenses of administration under any
Bankruptcy Law.

      The Trustee shall comply with the provisions of TIA (S) 313(b)(2) to the
extent applicable.

Section 7.08.  Replacement of Trustee.

      A resignation or removal of the Trustee and appointment of a successor
Trustee shall become effective only upon the successor Trustee's acceptance of
appointment as provided in this Section 7.08.

      The Trustee may resign in writing at any time and be discharged from the
trust hereby created by so notifying the Company.  The Holders of a majority in
principal amount of the then outstanding Notes may remove the Trustee by so
notifying the Trustee and the Company in writing.  The Company may remove the
Trustee if:

      (a) the Trustee fails to comply with Section 7.10 hereof;

      (b) the Trustee is adjudged a bankrupt or an insolvent or an order for
relief is entered with respect to the Trustee under any Bankruptcy Law;

      (c) a custodian or public officer takes charge of the Trustee or its
property; or

      (d) the Trustee becomes incapable of acting.

      If the Trustee resigns or is removed or if a vacancy exists in the office
of Trustee for any reason, the Company shall promptly appoint a successor
Trustee.  Within one year after the successor Trustee takes office, the Holders
of a majority in principal amount of the then outstanding Notes may appoint a
successor Trustee to replace the successor Trustee appointed by the Company.

      If a successor Trustee does not take office within 30 days after the
retiring Trustee resigns or is removed, the retiring Trustee, the Company, or
the Holders of at least 10% in principal amount of the then outstanding Notes
may petition any court of competent jurisdiction for the appointment of a
successor Trustee.

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      If the Trustee, after written request by any Holder who has been a Holder
for at least six months, fails to comply with Section 7.10, such Holder may
petition any court of competent jurisdiction for the removal of the Trustee and
the appointment of a successor Trustee.

      A successor Trustee shall deliver a written acceptance of its appointment
to the retiring Trustee and to the Company. Thereupon, the resignation or
removal of the retiring Trustee shall become effective, and the successor
Trustee shall have all the rights, powers and duties of the Trustee under this
Indenture. The successor Trustee shall mail a notice of its succession to
Holders. The retiring Trustee shall promptly transfer all property held by it as
Trustee to the successor Trustee, provided all sums owing to the Trustee
hereunder have been paid and subject to the Lien provided for in Section 7.07
hereof. Notwithstanding replacement of the Trustee pursuant to this Section
7.08, the Company's obligations under Section 7.07 hereof shall continue for the
benefit of the retiring Trustee.

Section 7.09.  Successor Trustee by Merger, etc.

      If the Trustee consolidates, merges or converts into, or transfers all or
substantially all of its corporate trust business to, another corporation, the
successor corporation without any further act shall be the successor Trustee.

Section 7.10.  Eligibility; Disqualification.

      There shall at all times be a Trustee hereunder that is a corporation
organized and doing business under the laws of the United States of America or
of any state thereof that is authorized under such laws to exercise corporate
trustee power, that is subject to supervision or examination by federal or state
authorities and that has a combined capital and surplus of at least $100 million
as set forth in its most recent published annual report of condition.

      This Indenture shall always have a Trustee who satisfies the requirements
of TIA (S) 310(a)(1), (2) and (5).  The Trustee is subject to TIA (S) 310(b).

Section 7.11.  Preferential Collection of Claims Against Company.

      The Trustee is subject to TIA (S) 311(a), excluding any creditor
relationship listed in TIA (S) 311(b).  A Trustee who has resigned or been
removed shall be subject to TIA (S) 311(a) to the extent indicated therein.

                                   ARTICLE 8
                   LEGAL DEFEASANCE AND COVENANT DEFEASANCE

Section 8.01.  Option to Effect Legal Defeasance or Covenant Defeasance.

      The Company may, at the option of its Board of Directors evidenced by a
resolution set forth in an Officers' Certificate, at any time, elect to have
either Section 8.02 or 8.03 hereof be applied to all outstanding Notes upon
compliance with the conditions set forth below in this Article Eight.

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Section 8.02.  Legal Defeasance and Discharge.

      Upon the Company's exercise under Section 8.01 hereof of the option
applicable to this Section 8.02, the Company shall, subject to the satisfaction
of the conditions set forth in Section 8.04 hereof, be deemed to have been
discharged from its obligations with respect to all outstanding Notes on the
date the conditions set forth below are satisfied (hereinafter, "Legal
Defeasance"). For this purpose, Legal Defeasance means that the Company shall be
deemed to have paid and discharged the entire Indebtedness represented by the
outstanding Notes, which shall thereafter be deemed to be "outstanding" only for
the purposes of Section 8.05 hereof and the other Sections of this Indenture
referred to in (a) and (b) below, and to have satisfied all its other
obligations under such Notes and this Indenture (and the Trustee, on demand of
and at the expense of the Company, shall execute proper instruments
acknowledging the same), except for the following provisions which shall survive
until otherwise terminated or discharged hereunder: (a) the rights of Holders of
outstanding Notes to receive solely from the trust fund described in Section
8.04 hereof, and as more fully set forth in such Section, payments in respect of
the principal of, premium and Liquidated Damages, if any, and interest on such
Notes when such payments are due, (b) the Company's obligations with respect to
such Notes under Article 2 and Section 4.02 hereof, (c) the rights, powers,
trusts, duties and immunities of the Trustee hereunder and the Company's
obligations in connection therewith and (d) the Legal Defeasance provisions of
this Article Eight. Subject to compliance with this Article Eight, the Company
may exercise its option under this Section 8.02 notwithstanding the prior
exercise of its option under Section 8.03 hereof.

Section 8.03.  Covenant Defeasance.

      Upon the Company's exercise under Section 8.01 hereof of the option
applicable to this Section 8.03, the Company shall, subject to the satisfaction
of the conditions set forth in Section 8.04 hereof, be released from its
obligations under the covenants contained in Sections 4.07, 4.08, 4.09, 4.10,
4.11, 4.12, 4.13, 4.15, 4.16, 4.17, 4.18, 4.19 and 4.20 hereof and clause (iv)
of Section 5.01 hereof with respect to the outstanding Notes on and after the
date the conditions set forth in Section 8.04 are satisfied (hereinafter,
"Covenant Defeasance"), and the Notes shall thereafter be deemed not
"outstanding" for the purposes of any direction, waiver, consent or declaration
or act of Holders (and the consequences of any thereof) in connection with such
covenants, but shall continue to be deemed "outstanding" for all other purposes
hereunder (it being understood that such Notes shall not be deemed outstanding
for accounting purposes).  For this purpose, Covenant Defeasance means that,
with respect to the outstanding Notes, the Company may omit to comply with and
shall have no liability in respect of any term, condition or limitation set
forth in any such covenant, whether directly or indirectly, by reason of any
reference elsewhere herein to any such covenant or by reason of any reference in
any such covenant to any other provision herein or in any other document and
such omission to comply shall not constitute a Default or an Event of Default
under Section 6.01 hereof, but, except as specified above, the remainder of this
Indenture and such Notes shall be unaffected thereby.  In addition, upon the
Company's exercise under Section 8.01 hereof of the option applicable to this
Section 8.03 hereof, subject to the satisfaction of the conditions set forth in
Section 8.04 hereof, Sections 6.01(c) through 6.01(f) hereof shall not
constitute Events of Default.

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Section 8.04.  Conditions to Legal or Covenant Defeasance.

      The following shall be the conditions to the application of either Section
8.02 or 8.03 hereof to the outstanding Notes:

      In order to exercise either Legal Defeasance or Covenant Defeasance:

      (a) the Company must irrevocably deposit with the Trustee, in trust, for
the benefit of the Holders, cash in United States dollars, non-callable
Government Securities, or a combination thereof, in such amounts as will be
sufficient, in the opinion of a nationally recognized firm of independent public
accountants, to pay the principal of, premium and Liquidated Damages, if any,
and interest on the outstanding Notes on the stated maturity or on the
applicable redemption date, as the case may be, and the Company must specify
whether the Notes are being defeased to maturity or to a particular redemption
date;

      (b) in the case of an election under Section 8.02 hereof, the Company
shall have delivered to the Trustee an Opinion of Counsel in the United States
reasonably acceptable to the Trustee confirming that (A) the Company has
received from, or there has been published by, the Internal Revenue Service a
ruling or (B) since the date of this Indenture, there has been a change in the
applicable federal income tax law, in either case to the effect that, and based
thereon such Opinion of Counsel shall confirm that, subject to customary
assumptions and exceptions, the Holders of the outstanding Notes will not
recognize income, gain or loss for federal income tax purposes as a result of
such Legal Defeasance and will be subject to federal income tax on the same
amounts, in the same manner and at the same times as would have been the case if
such Legal Defeasance had not occurred;

      (c) in the case of an election under Section 8.03 hereof, the Company
shall have delivered to the Trustee an Opinion of Counsel in the United States
reasonably acceptable to the Trustee confirming that, subject to customary
assumptions and exceptions, the Holders of the outstanding Notes will not
recognize income, gain or loss for federal income tax purposes as a result of
such Covenant Defeasance and will be subject to federal income tax on the same
amounts, in the same manner and at the same times as would have been the case if
such Covenant Defeasance had not occurred;

      (d) no Default or Event of Default shall have occurred and be continuing
on the date of such deposit (other than a Default or Event of Default resulting
from the incurrence of Indebtedness all or a portion of the proceeds of which
will be used to defease the Notes pursuant to this Article Eight concurrently
with such incurrence) or insofar as Sections 6.01(g) or 6.01(h) hereof is
concerned, at any time in the period ending on the 91st day after the date of
deposit;

      (e) such Legal Defeasance or Covenant Defeasance shall not result in a
material breach or violation of, or constitute a default under, any material
agreement or instrument (other than this Indenture) to which the Company or any
of its Subsidiaries is a party or by which the Company or any of its
Subsidiaries is bound;

      (f) the Company shall have delivered to the Trustee an Opinion of Counsel
to the effect that, subject to customary assumptions and exceptions, after the
91st day following the deposit, the trust funds

                                       69

 
will not be subject to the effect of any applicable bankruptcy, insolvency,
reorganization or similar laws affecting creditors' rights generally;

      (g) the Company shall have delivered to the Trustee an Officers'
Certificate stating that the deposit was not made by the Company with the intent
of preferring the Holders of Notes over any other creditors of the Company or
with the intent of defeating, hindering, delaying or defrauding any other
creditors of the Company; and

      (h) the Company shall have delivered to the Trustee an Officers'
Certificate and an Opinion of Counsel, each stating that all conditions
precedent provided for or relating to the Legal Defeasance or the Covenant
Defeasance have been complied with.

Section 8.05.  Deposited Money and Government Securities to be Held in Trust;
Other Miscellaneous Provisions.

      Subject to Section 8.06 hereof, all money and non-callable Government
Securities (including the proceeds thereof) deposited with the Trustee (or other
qualifying trustee, collectively for purposes of this Section 8.05, the
"Trustee") pursuant to Section 8.04 hereof in respect of the outstanding Notes
shall be held in trust and applied by the Trustee, in accordance with the
provisions of such Notes and this Indenture, to the payment, either directly or
through any Paying Agent (including the Company acting as Paying Agent) as the
Trustee may determine, to the Holders of such Notes of all sums due and to
become due thereon in respect of principal, premium, if any, and interest, but
such money need not be segregated from other funds except to the extent required
by law.

      The Company shall pay and indemnify the Trustee against any tax, fee or
other charge imposed on or assessed against the cash or non-callable Government
Securities deposited pursuant to Section 8.04 hereof or the principal and
interest received in respect thereof other than any such tax, fee or other
charge which by law is for the account of the Holders of the outstanding Notes.

      Anything in this Article Eight to the contrary notwithstanding, the
Trustee shall deliver or pay to the Company from time to time upon the request
of the Company any money or non-callable Government Securities held by it as
provided in Section 8.04 hereof which, in the opinion of a nationally recognized
firm of independent public accountants expressed in a written certification
thereof delivered to the Trustee (which may be the opinion delivered under
Section 8.04(a) hereof), are in excess of the amount thereof that would then be
required to be deposited to effect an equivalent Legal Defeasance or Covenant
Defeasance.

      The Trustee shall promptly pay to the Company, after written request
therefor, any money held at such time in excess of the amounts required to pay
any of the Company's Obligations then owing with respect to the Notes.

Section 8.06.  Repayment to Company.

      Any money deposited with the Trustee or any Paying Agent, or then held by
the Company, in trust for the payment of the principal of, premium, if any, or
interest on any Note and remaining

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unclaimed for two years after such principal, and premium, if any, or interest
has become due and payable shall be paid to the Company on its request or (if
then held by the Company) shall be discharged from such trust; and the Holder of
such Note shall thereafter look only to the Company for payment thereof, and all
liability of the Trustee or such Paying Agent with respect to such trust money,
and all liability of the Company as trustee thereof, shall thereupon cease;
provided, however, that the Trustee or such Paying Agent, before being required
to make any such repayment, may at the expense of the Company cause to be
published once, in the New York Times and The Wall Street Journal (national
edition), notice that such money remains unclaimed and that, after a date
specified therein, which shall not be less than 30 days from the date of such
notification or publication, any unclaimed balance of such money then remaining
will be repaid to the Company.

Section 8.07.  Reinstatement.

      If the Trustee or Paying Agent is unable to apply any United States
dollars or non-callable Government Securities in accordance with Section 8.02 or
8.03 hereof, as the case may be, by reason of any order or judgment of any court
or governmental authority enjoining, restraining or otherwise prohibiting such
application, then the Company's obligations under this Indenture and the Notes
shall be revived and reinstated as though no deposit had occurred pursuant to
Section 8.02 or 8.03 hereof until such time as the Trustee or Paying Agent is
permitted to apply all such money in accordance with Section 8.02 or 8.03
hereof, as the case may be; provided, however, that, if the Company makes any
payment of principal of, premium, if any, or interest on any Note following the
reinstatement of its obligations, the Company shall be subrogated to the rights
of the Holders of such Notes to receive such payment from the money held by the
Trustee or Paying Agent.

                                   ARTICLE 9
                       AMENDMENT, SUPPLEMENT AND WAIVER

Section 9.01.  Without Consent of Holders of Notes.

      Notwithstanding Section 9.02 of this Indenture, the Company, the
Subsidiary Guarantors and the Trustee may amend or supplement this Indenture,
the Subsidiary Guarantees or the Notes without the consent of any Holder of a
Note:

      (a) to cure any ambiguity, defect or inconsistency;

      (b) to provide for uncertificated Notes in addition to or in place of
certificated Notes or to alter the provisions of Article 2 hereof (including the
related definitions) in a manner that does not materially adversely affect any
Holder;

      (c) to provide for the assumption of the Company's or a Subsidiary's
Guarantor's obligations to the Holders of the Notes by a successor to the
Company pursuant to Article 5 or Article 10 hereof;

      (d) to make any change that would provide any additional rights or
benefits to the Holders of the Notes or that does not adversely affect the legal
rights hereunder of any Holder of the Note;

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      (e) to comply with requirements of the SEC in order to effect or maintain
the qualification of this Indenture under the TIA;

      (f) to provide for the issuance of Additional Notes in accordance with the
limitations set forth in this Indenture as of the date hereof; or

      (g) to allow any Subsidiary Guarantor to execute a supplemental indenture
and/or a Subsidiary Guarantee with respect to the Notes.

      Upon the request of the Company accompanied by a resolution of its Board
of Directors authorizing the execution of any such amended or supplemental
Indenture, and upon receipt by the Trustee of the documents described in Section
7.02 hereof, the Trustee shall join with the Company and the Subsidiary
Guarantors in the execution of any amended or supplemental Indenture authorized
or permitted by the terms of this Indenture and to make any further appropriate
agreements and stipulations that may be therein contained, but the Trustee shall
not be obligated to enter into such amended or supplemental indenture that
affects its own rights, duties or immunities under this Indenture or otherwise.

Section 9.02.  With Consent of Holders of Notes.

      Except as provided below in this Section 9.02, the Company and the Trustee
may amend or supplement this Indenture (including Section 3.09, 4.10 and 4.15
hereof), the Subsidiary Guarantees or the Notes with the consent of the Holders
of at least a majority in principal amount of the Notes (including Additional
Notes) then outstanding voting as a single class (including, without limitation,
consents obtained in connection with a purchase of, or tender offer or exchange
offer for, Notes), and, subject to Sections 6.04 and 6.07 hereof, any existing
Default or Event of Default (other than a Default or Event of Default in the
payment of the principal of, premium, Liquidated Damages, if any, or interest on
the Notes, except a payment default resulting from an acceleration that has been
rescinded) or compliance with any provision of this Indenture, the Notes or the
Subsidiary Guarantees may be waived with the consent of the Holders of a
majority in principal amount of the then outstanding Notes (including, without
limitation, consents obtained in connection with a purchase of, or tender offer
or exchange offer for, Notes).

      Upon the request of the Company accompanied by a resolution of its Board
of Directors authorizing the execution of any such amended or supplemental
Indenture, and upon the filing with the Trustee of evidence satisfactory to the
Trustee of the consent of the Holders of Notes as aforesaid, and upon receipt by
the Trustee of the documents described in Section 7.02 hereof, the Trustee shall
join with the Company in the execution of such amended or supplemental Indenture
unless such amended or supplemental Indenture directly affects the Trustee's own
rights, duties or immunities under this Indenture or otherwise, in which case
the Trustee may in its discretion, but shall not be obligated to, enter into
such amended or supplemental Indenture.

      It shall not be necessary for the consent of the Holders of Notes under
this Section 9.02 to approve the particular form of any proposed amendment or
waiver, but it shall be sufficient if such consent approves the substance
thereof.

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      After an amendment, supplement or waiver under this Section becomes
effective, the Company shall mail to the Holders of Notes affected thereby a
notice briefly describing the amendment, supplement or waiver.  Any failure of
the Company to mail such notice, or any defect therein, shall not, however, in
any way impair or affect the validity of any such amended or supplemental
Indenture or waiver.  Subject to Sections 6.04 and 6.07 hereof, the Holders of a
majority in aggregate principal amount of the Notes (including Additional Notes,
if any) then outstanding voting as a single class may waive compliance in a
particular instance by the Company with any provision of this Indenture or the
Notes.  However, without the consent of each Holder affected, an amendment or
waiver under this Section 9.02 may not (with respect to any Notes held by a non-
consenting Holder):

      (a) reduce the principal amount of Notes whose Holders must consent to an
amendment, supplement or waiver;

      (b) reduce the principal of or change the fixed maturity of any Note or
alter or waive any of the provisions with respect to the redemption of the Notes
(except as provided above with respect to Sections 3.09, 4.10 and 4.15 hereof);

      (c) reduce the rate of or change the time for payment of interest,
including default interest, on any Note;

      (d) waive a Default or Event of Default in the payment of principal of or
premium, if any, or interest on the Notes (except a rescission of acceleration
of the Notes by the Holders of at least a majority in aggregate principal amount
of the then outstanding Notes (including Additional Notes, if any) and a waiver
of the payment default that resulted from such acceleration);

      (e) make any Note payable in money other than that stated in the Notes;

      (f) make any change in the provisions of this Indenture relating to
waivers of past Defaults or the rights of Holders of Notes to receive payments
of principal of or interest on the Notes;

      (g) make any change in Section 6.04 or 6.07 hereof or in the foregoing
amendment and waiver provisions; or

      (h) release any Subsidiary Guarantor from any of its obligations under its
Subsidiary Guarantee or this Indenture, except in accordance with the terms of
this Indenture.

      In addition, any amendment of the provisions of Article 10 herein will
require the consent of the Holders of at least 75% in aggregate principal amount
of the Notes then outstanding if such amendment would adversely affect the
rights of Holders of the Notes.

Section 9.03.  Compliance with Trust Indenture Act.

      Every amendment or supplement to this Indenture or the Notes shall be set
forth in a amended or supplemental Indenture that complies with the TIA as then
in effect.

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Section 9.04.  Revocation and Effect of Consents.

      Until an amendment, supplement or waiver becomes effective, a consent to
it by a Holder of a Note is a continuing consent by the Holder of a Note and
every subsequent Holder of a Note or portion of a Note that evidences the same
debt as the consenting Holder's Note, even if notation of the consent is not
made on any Note.  However, any such Holder of a Note or subsequent Holder of a
Note may revoke the consent as to its Note if the Trustee receives written
notice of revocation before the date the waiver, supplement or amendment becomes
effective.  An amendment, supplement or waiver becomes effective in accordance
with its terms and thereafter binds every Holder.

      The Company may, but shall not be obligated to, fix a record date for the
purpose of determining the Holders entitled to give their consent to any
amendment, supplement or waiver or take any other action described above or
required or permitted to be taken pursuant to this Indenture. If a record date
is fixed, then notwithstanding the immediately preceding paragraph, those
Persons who were Holders at such record date (or their duly designated proxies),
and only those Persons, shall be entitled to give such consent to such
amendment, supplement or waiver or to revoke any consent previously given or to
take any such action, whether or not such Persons continue to be Holders after
such record date. No such consent shall be valid or effective for more than 90
days after such record date.

Section 9.05.  Notation on or Exchange of Notes.

      The Trustee may place an appropriate notation about an amendment,
supplement or waiver on any Note thereafter authenticated.  The Company in
exchange for all Notes may issue and the Trustee shall, upon receipt of an
Authentication Order, authenticate new Notes that reflect the amendment,
supplement or waiver.

      Failure to make the appropriate notation or issue a new Note shall not
affect the validity and effect of such amendment, supplement or waiver.

Section 9.06.  Trustee to Sign Amendments, etc.

      The Trustee shall sign any amended or supplemental Indenture authorized
pursuant to this Article Nine if the amendment or supplement does not adversely
affect the rights, duties, liabilities or immunities of the Trustee.  The
Company may not sign an amendment or supplemental Indenture until the Board of
Directors approves it.  In executing any amended or supplemental indenture, the
Trustee shall be entitled to receive and (subject to Section 7.01 hereof) shall
be fully protected in relying upon, in addition to the documents required by
Section 12.04 hereof, an Officers' Certificate and an Opinion of Counsel stating
that the execution of such amended or supplemental indenture is authorized or
permitted by this Indenture.

                                       74

 
                                  ARTICLE 10
                                 SUBORDINATION

Section 10.01.  Agreement to Subordinate.

      The Company agrees, and each Holder by accepting a Note agrees, that the
Indebtedness evidenced by the Notes is subordinated in right of payment, to the
extent and in the manner provided in this Article 10, to the prior payment in
full of all Senior Debt (whether outstanding on the date hereof or hereafter
created, incurred, assumed or guaranteed), and that the subordination is for the
benefit of the holders of Senior Debt.

Section 10.02.  Liquidation; Dissolution; Bankruptcy.

      Upon any distribution to creditors of the Company in a liquidation or
dissolution of the Company or in a bankruptcy, reorganization, insolvency,
receivership or similar proceeding relating to the Company or its property, an
assignment for the benefit of creditors or any marshaling of the Company's
assets and liabilities:

         (i)    holders of Senior Debt shall be entitled to receive payment in
   full of all Obligations due in respect of such Senior Debt (including
   interest after the commencement of any such proceeding at the rate specified
   in the applicable Senior Debt) before Holders of the Notes shall be entitled
   to receive any payment with respect to the Notes (except that Holders may
   receive (A) Permitted Junior Securities and (B) payments and other
   distributions made from any defeasance trust created pursuant to Section 8.01
   hereof); and

         (ii)   until all Obligations with respect to Senior Debt (as provided
   in clause (i) above) are paid in full, any distribution to which Holders
   would be entitled but for this Article 10 shall be made to holders of Senior
   Debt (except that Holders of Notes may receive (A) Permitted Junior
   Securities and (B) payments and other distributions made from any defeasance
   trust created pursuant to Section 8.01 hereof), as their interests may
   appear.

Section 10.03.  Default on Designated Senior Debt.

      (a) The Company may not make any payment or distribution to the Trustee or
any Holder in respect of Obligations with respect to the Notes and may not
acquire from the Trustee or any Holder any Notes for cash or property (other
than (A) Permitted Junior Securities and (B) payments and other distributions
made from any defeasance trust created pursuant to Section 8.01 hereof) until
all principal and other Obligations with respect to the Senior Debt have been
paid in full if:

          (i)   a default in the payment of any principal or other Obligations
   with respect to Designated Senior Debt occurs and is continuing beyond any
   applicable grace period in the agreement, indenture or other document
   governing such Designated Senior Debt; or

          (ii)  a default, other than a payment default, on Designated Senior
   Debt occurs and is continuing that then permits holders of the Designated
   Senior Debt to accelerate its maturity and the Trustee receives a notice of
   the default (a "Payment Blockage Notice") from a Person who may

                                       75

 
   give it pursuant to Section 10.11 hereof. If the Trustee receives any such
   Payment Blockage Notice, no subsequent Payment Blockage Notice shall be
   effective for purposes of this Section unless and until (A) at least 360 days
   shall have elapsed since the effectiveness of the immediately prior Payment
   Blockage Notice and (B) all scheduled payments of principal, premium, if any,
   and interest on the Securities that have come due have been paid in full in
   cash. No nonpayment default that existed or was continuing on the date of
   delivery of any Payment Blockage Notice to the Trustee shall be, or be made,
   the basis for a subsequent Payment Blockage Notice.

      (b) The Company may and shall resume payments on and distributions in
respect of the Notes and may acquire them upon the earlier of:

         (i)  the date upon which the default is cured or waived, or

         (ii) in the case of a default referred to in clause (ii) of Section
   10.03(a) hereof, 179 days pass after notice is received if the maturity of
   such Designated Senior Debt has not been accelerated,

if this Article 10 otherwise permits the payment, distribution or acquisition at
the time of such payment or acquisition.

Section 10.04.  Acceleration of Securities.

      If payment of the Securities is accelerated because of an Event of
Default, the Company shall promptly notify holders of Senior Debt of the
acceleration.

Section 10.05.  When Distribution Must Be Paid Over.

      In the event that the Trustee or any Holder receives any payment of any
Obligations with respect to the Notes at a time when the Trustee or such Holder,
as applicable, has actual knowledge that such payment is prohibited by Section
10.03 hereof, such payment shall be held by the Trustee or such Holder, in trust
for the benefit of, and shall be paid forthwith over and delivered, upon written
request, to, the holders of Senior Debt as their interests may appear or their
Representative under the indenture or other agreement (if any) pursuant to which
Senior Debt may have been issued, as their respective interests may appear, for
application to the payment of all Obligations with respect to Senior Debt
remaining unpaid to the extent necessary to pay such Obligations in full in
accordance with their terms, after giving effect to any concurrent payment or
distribution to or for the holders of Senior Debt.

      With respect to the holders of Senior Debt, the Trustee undertakes to
perform only such obligations on the part of the Trustee as are specifically set
forth in this Article 10, and no implied covenants or obligations with respect
to the holders of Senior Debt shall be read into this Indenture against the
Trustee.  The Trustee shall not be deemed to owe any fiduciary duty to the
holders of Senior Debt, and shall not be liable to any such holders if the
Trustee shall pay over or distribute to or on behalf of Holders or the Company
or any other Person money or assets to which any holders of Senior Debt shall be
entitled by virtue of this Article 10, except if such payment is made as a
result of the willful misconduct or gross negligence of the Trustee.

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Section 10.06.  Notice by Company.

      The Company shall promptly notify the Trustee and the Paying Agent of any
facts known to the Company that would cause a payment of any Obligations with
respect to the Notes to violate this Article 10, but failure to give such notice
shall not affect the subordination of the Notes to the Senior Debt as provided
in this Article 10.

Section 10.07.  Subrogation.

      After all Senior Debt is paid in full and until the Notes are paid in
full, Holders of Notes shall be subrogated (equally and ratably with all other
Indebtedness pari passu with the Notes) to the rights of holders of Senior Debt
to receive distributions applicable to Senior Debt to the extent that
distributions otherwise payable to the Holders of Notes have been applied to the
payment of Senior Debt.  A distribution made under this Article 10 to holders of
Senior Debt that otherwise would have been made to Holders of Notes is not, as
between the Company and Holders, a payment by the Company on the Notes.

Section 10.08.  Relative Rights.

      This Article 10 defines the relative rights of Holders of Notes and
holders of Senior Debt.  Nothing in this Indenture shall:

         (i)    impair, as between the Company and Holders of Notes, the
   obligation of the Company, which is absolute and unconditional, to pay
   principal of and interest on the Notes in accordance with their terms;

         (ii)   affect the relative rights of Holders of Notes and creditors of
   the Company other than their rights in relation to holders of Senior Debt; or

         (iii)  prevent the Trustee or any Holder of Notes from exercising its
   available remedies upon a Default or Event of Default, subject to the rights
   of holders and owners of Senior Debt to receive distributions and payments
   otherwise payable to Holders of Notes.

      If the Company fails because of this Article 10 to pay principal of or
interest on a Note on the due date, the failure is still a Default or Event of
Default.

Section 10.09.  Subordination May Not Be Impaired by Company.

      No right of any holder of Senior Debt to enforce the subordination of the
Indebtedness evidenced by the Notes shall be impaired by any act or failure to
act by the Company or any Holder or by the failure of the Company or any Holder
to comply with this Indenture.

Section 10.10.  Distribution or Notice to Representative.

      Whenever a distribution is to be made or a notice given to holders of
Senior Debt, the distribution may be made and the notice given to their
Representative.

                                       77

 
      Upon any payment or distribution of assets of the Company referred to in
this Article 10, the Trustee and the Holders of Notes shall be entitled to rely
upon any order or decree made by any court of competent jurisdiction or upon any
certificate of such Representative or of the liquidating trustee or agent or
other Person making any distribution to the Trustee or to the Holders of Notes
for the purpose of ascertaining the Persons entitled to participate in such
distribution, the holders of the Senior Debt and other Indebtedness of the
Company, the amount thereof or payable thereon, the amount or amounts paid or
distributed thereon and all other facts pertinent thereto or to this Article 10.

Section 10.11.  Rights of Trustee and Paying Agent.

      Notwithstanding the provisions of this Article 10 or any other provision
of this Indenture, the Trustee shall not be charged with knowledge of the
existence of any facts that would prohibit the making of any payment or
distribution by the Trustee, and the Trustee and the Paying Agent may continue
to make payments on the Notes, unless the Trustee shall have received at its
Corporate Trust Office at least five Business Days prior to the date of such
payment written notice of facts that would cause the payment of any Obligations
with respect to the Notes to violate this Article 10.  Only the Company or a
Representative may give the notice.  Nothing in this Article 10 shall impair the
claims of, or payments to, the Trustee under or pursuant to Section 7.07 hereof.

      The Trustee in its individual or any other capacity may hold Senior Debt
with the same rights it would have if it were not Trustee.  Any Agent may do the
same with like rights.

Section 10.12.  Authorization to Effect Subordination.

      Each Holder of Notes, by the Holder's acceptance thereof, authorizes and
directs the Trustee on such Holder's behalf to take such action as may be
necessary or appropriate to effectuate the subordination as provided in this
Article 10, and appoints the Trustee to act as such Holder's attorney-in-fact
for any and all such purposes.  If the Trustee does not file a proper proof of
claim or proof of debt in the form required in any proceeding referred to in
Section 6.09 hereof at least 30 days before the expiration of the time to file
such claim, the Representatives are hereby authorized to file an appropriate
claim for and on behalf of the Holders of the Notes.

Section 10.13.  Amendments.

      The provisions of this Article 10 and Section 11.02 shall not be amended
or modified without the written consent of the holders of all Senior Debt.

Section 10.14.  Trustee Not Fiduciary for Holders of Senior Debt.

      The Trustee shall not be deemed to owe any fiduciary duty to the holders
of Senior Debt and shall not be liable to any such holders if the Trustee shall
in good faith mistakenly pay over or distribute to Holders of Notes or to the
Company or to any other person cash, property or securities to which any holders
of Senior Debt shall be entitled by virtue of this Article 10 or otherwise.
With respect to the holders of Senior Debt, the Trustee undertakes to perform or
to observe only such of its covenants or

                                       78

 
obligations as are specifically set forth in this Article 10 and no implied
covenants or obligations with respect to holders of Senior Debt shall be read
into this Indenture against the Trustee.

                                  ARTICLE 11
                             SUBSIDIARY GUARANTEES

Section 11.01.  Guarantee.

      Subject to this Article 11, each of the Subsidiary Guarantors hereby,
jointly and severally, unconditionally guarantees to each Holder of a Note
authenticated and delivered by the Trustee and to the Trustee and its successors
and assigns, irrespective of the validity and enforceability of this Indenture,
the Notes or the obligations of the Company hereunder or thereunder, that: (a)
the principal of and interest on the Notes will be promptly paid in full when
due, whether at maturity, by acceleration, redemption or otherwise, and interest
on the overdue principal of and interest on the Notes, if any, if lawful, and
all other obligations of the Company to the Holders or the Trustee hereunder or
thereunder will be promptly paid in full or performed, all in accordance with
the terms hereof and thereof; and (b) in case of any extension of time of
payment or renewal of any Notes or any of such other obligations, that same will
be promptly paid in full when due or performed in accordance with the terms of
the extension or renewal, whether at stated maturity, by acceleration or
otherwise. Failing payment when due of any amount so guaranteed or any
performance so guaranteed for whatever reason, the Subsidiary Guarantors shall
be jointly and severally obligated to pay the same immediately. Each Subsidiary
Guarantor agrees that this is a guarantee of payment and not a guarantee of
collection.

      The Subsidiary Guarantors hereby agree that their obligations hereunder
shall be unconditional, irrespective of the validity, regularity or
enforceability of the Notes or this Indenture, the absence of any action to
enforce the same, any waiver or consent by any Holder of the Notes with respect
to any provisions hereof or thereof, the recovery of any judgment against the
Company, any action to enforce the same or any other circumstance which might
otherwise constitute a legal or equitable discharge or defense of a guarantor.
Each Subsidiary Guarantor hereby waives diligence, presentment, demand of
payment, filing of claims with a court in the event of insolvency or bankruptcy
of the Company, any right to require a proceeding first against the Company,
protest, notice and all demands whatsoever and covenant that this Subsidiary
Guarantee shall not be discharged except by complete performance of the
obligations contained in the Notes and this Indenture.

      If any Holder or the Trustee is required by any court or otherwise to
return to the Company, the Subsidiary Guarantors or any custodian, trustee,
liquidator or other similar official acting in relation to either the Company or
the Subsidiary Guarantors, any amount paid by either to the Trustee or such
Holder, this Subsidiary Guarantee, to the extent theretofore discharged, shall
be reinstated in full force and effect.

      Each Subsidiary Guarantor agrees that it shall not be entitled to any
right of subrogation in relation to the Holders in respect of any obligations
guaranteed hereby until payment in full of all obligations guaranteed hereby.
Each Subsidiary Guarantor further agrees that, as between the Subsidiary

                                       79

 
Guarantors, on the one hand, and the Holders and the Trustee, on the other hand,
(x) the maturity of the obligations guaranteed hereby may be accelerated as
provided in Article 6 hereof for the purposes of this Subsidiary Guarantee,
notwithstanding any stay, injunction or other prohibition preventing such
acceleration in respect of the obligations guaranteed hereby, and (y) in the
event of any declaration of acceleration of such obligations as provided in
Article 6 hereof, such obligations (whether or not due and payable) shall
forthwith become due and payable by the Subsidiary Guarantors for the purpose of
this Subsidiary Guarantee.  The Subsidiary Guarantors shall have the right to
seek contribution from any non-paying Subsidiary Guarantor so long as the
exercise of such right does not impair the rights of the Holders under the
Guarantee.

Section 11.02.  Subordination of Subsidiary Guarantee.

      The Obligations of each Subsidiary Guarantor under its Subsidiary
Guarantee pursuant to this Article 11 shall be junior and subordinated to the
Senior Debt of such Subsidiary Guarantor on the same basis as the Notes are
junior and subordinated to Senior Debt of the Company.  For the purposes of the
foregoing sentence, the Trustee and the Holders shall have the right to receive
and/or retain payments by any of the Subsidiary Guarantors only at such times as
they may receive and/or retain payments in respect of the Notes pursuant to this
Indenture, including Article 10 hereof.

Section 11.03.  Limitation on Guarantor Liability.

      Each Subsidiary Guarantor, and by its acceptance of Notes, each Holder,
hereby confirms that it is the intention of all such parties that the Subsidiary
Guarantee of such Subsidiary Guarantor not constitute a fraudulent transfer or
conveyance for purposes of Bankruptcy Law, the Uniform Fraudulent Conveyance
Act, the Uniform Fraudulent Transfer Act or any similar federal or state law to
the extent applicable to any Subsidiary Guarantee. To effectuate the foregoing
intention, the Trustee, the Holders and the Subsidiary Guarantors hereby
irrevocably agree that the obligations of such Subsidiary Guarantor will, after
giving effect to such maximum amount and all other contingent and fixed
liabilities of such Subsidiary Guarantor that are relevant under such laws, and
after giving effect to any collections from, rights to receive contribution from
or payments made by or on behalf of any other Subsidiary Guarantor in respect of
the obligations of such other Subsidiary Guarantor under this Article 11, result
in the obligations of such Subsidiary Guarantor under its Subsidiary Guarantee
not constituting a fraudulent transfer or conveyance.

Section 11.04.  Execution and Delivery of Subsidiary Guarantee.

      To evidence its Subsidiary Guarantee set forth in Section 11.01, each
Subsidiary Guarantor hereby agrees that a notation of such Subsidiary Guarantee
substantially in the form included in Exhibit E shall be endorsed by an Officer
of such Subsidiary Guarantor on each Note authenticated and delivered by the
Trustee and that this Indenture shall be executed on behalf of such Subsidiary
Guarantor by its President or one of its Vice Presidents.

      Each Subsidiary Guarantor hereby agrees that its Subsidiary Guarantee set
forth in Section 11.01 shall remain in full force and effect notwithstanding any
failure to endorse on each Note a notation of such Subsidiary Guarantee.

                                       80

 
      If an Officer whose signature is on this Indenture or on the Subsidiary
Guarantee no longer holds that office at the time the Trustee authenticates the
Note on which a Subsidiary Guarantee is endorsed, the Subsidiary Guarantee shall
be valid nevertheless.

      The delivery of any Note by the Trustee, after the authentication thereof
hereunder, shall constitute due delivery of the Subsidiary Guarantee set forth
in this Indenture on behalf of the Subsidiary Guarantors.

      In the event that the Company creates or acquires any new Subsidiaries
subsequent to the date of this Indenture, if required by Section 4.20 hereof,
the Company shall cause such Subsidiaries to execute supplemental indentures to
this Indenture and Subsidiary Guarantees in accordance with Section 4.20 hereof
and this Article 11, to the extent applicable.

Section 11.05.  Subsidiary Guarantors May Consolidate, etc., on Certain Terms.

      Except as otherwise provided in Section 11.06, no Subsidiary Guarantor may
consolidate with or merge with or into (whether or not such Subsidiary Guarantor
is the surviving Person) another Person whether or not affiliated with such
Subsidiary Guarantor unless:

      (a) subject to Section 11.06 hereof, the Person formed by or surviving any
such consolidation or merger (if other than a Subsidiary Guarantor or the
Company) unconditionally assumes all the obligations of such Subsidiary
Guarantor, pursuant to operation of law or a supplemental indenture in form

and substance reasonably satisfactory to the Trustee, under the Notes, this
Indenture and the Subsidiary Guarantee on the terms set forth herein or therein;
and

      (b) immediately after giving effect to such transaction, no Default or
Event of Default exists.

      In case of any such consolidation, merger, sale or conveyance and upon the
assumption by the successor Person, by operation of law or supplemental
indenture, executed and delivered to the Trustee and satisfactory in form to the
Trustee, of the Subsidiary Guarantee endorsed upon the Notes and the due and
punctual performance of all of the covenants and conditions of this Indenture to
be performed by the Subsidiary Guarantor, such successor Person shall succeed to
and be substituted for the Subsidiary Guarantor with the same effect as if it
had been named herein as a Subsidiary Guarantor.  Such successor Person shall,
as soon as reasonably practicable upon such consolidation, merger, sale or
conveyance, execute and deliver to the Trustee a supplemental indenture
satisfactory in form to the Trustee.  Such successor Person thereupon may cause
to be signed any or all of the Subsidiary Guarantees to be endorsed upon all of
the Notes issuable hereunder which theretofore shall not have been signed by the
Company and delivered to the Trustee.  All the Subsidiary Guarantees so issued
shall in all respects have the same legal rank and benefit under this Indenture
as the Subsidiary Guarantees theretofore and thereafter issued in accordance
with the terms of this Indenture as though all of such Subsidiary Guarantees had
been issued at the date of the execution hereof.

      Except as set forth in Articles 4 and 5 hereof, and notwithstanding
clauses (a) and (b) above, nothing contained in this Indenture or in any of the
Notes shall prevent any consolidation or merger of a Subsidiary Guarantor with
or into the Company or another Subsidiary Guarantor, or shall prevent any

                                       81

 
sale or conveyance of the property of a Guarantor as an entirety or
substantially as an entirety to the Company or another Subsidiary Guarantor.

Section 11.06.  Releases Following Sale of Assets.

      In the event of a sale or other disposition of all of the assets of any
Subsidiary Guarantor, by way of merger, consolidation or otherwise, or a sale or
other disposition of all to the capital stock of any Subsidiary Guarantor, in
each case to a Person that is not (either before or after giving effect to such
transactions) a Restricted Subsidiary of the Company, then such Subsidiary
Guarantor (in the event of a sale or other disposition, by way of merger,
consolidation or otherwise, of all of the capital stock of such Subsidiary
Guarantor) or the corporation acquiring the property (in the event of a sale or
other disposition of all or substantially all of the assets of such Subsidiary
Guarantor) will be released and relieved of any obligations under its Subsidiary
Guarantee; provided that the Net Proceeds of such sale or other disposition are
applied in accordance with the applicable provisions of this Indenture,
including without limitation Section 4.10 hereof.  Upon delivery by the Company
to the Trustee of an Officers' Certificate and an Opinion of Counsel to the
effect that such sale or other disposition was made by the Company in accordance
with the provisions of this Indenture, including without limitation Section 4.10
hereof, the Trustee shall execute any documents reasonably required in order to
evidence the release of any Subsidiary Guarantor from its obligations under its
Subsidiary Guarantee.

      In the event the Company designates a Restricted Subsidiary to become an
Unrestricted Subsidiary in accordance with this Indenture, then such Restricted
Subsidiary shall, in accordance with this Indenture, be released from its
obligations under its Subsidiary Guarantee upon the effectiveness of such
designation.

      Any Subsidiary Guarantor not released from its obligations under its
Subsidiary Guarantee shall remain liable for the full amount of principal of and
interest on the Notes and for the other obligations of any Guarantor under this
Indenture as provided in this Article 11.

                                  ARTICLE 12
                                 MISCELLANEOUS

Section 12.01.  Trust Indenture Act Controls.

      If any provision of this Indenture limits, qualifies or conflicts with the
duties imposed by TIA (S)318(c), the imposed duties shall control.

Section 12.02.  Notices.

      Any notice or communication by the Company, any Subsidiary Guarantor or
the Trustee to the others is duly given if in writing and delivered in Person or
mailed by first class mail (registered or certified, return receipt requested),
telecopier or overnight air courier guaranteeing next day delivery, to the
others' address:

                                       82

 
      If to the Company and/or any Subsidiary Guarantor:

      Great Lakes Dredge & Dock Corporation
      2122 York Road
      Oak Brook, Illinois 60521
      Telecopier No.: (630) 574-3007
      Attention: President

      With a copy to:

      Dechert Price & Rhoads
      4000 Bell Atlantic Tower
      1717 Arch Street
      Philadelphia, Pennsylvania 19103
      Telecopier No.: (215) 994-2222
      Attention: G. Daniel O'Donnell, Esq.


      If to the Trustee:

      The Bank of New York
      101 Barclay Street, Floor 21 West
      New York, New York  10286
      Telecopier No.: (212) 815-5915
      Attention: Corporate Trust Trustee Administration

      The Company, any Subsidiary Guarantor or the Trustee, by notice to the
others may designate additional or different addresses for subsequent notices or
communications.

      All notices and communications (other than those sent to Holders) shall be
deemed to have been duly given: at the time delivered by hand, if personally
delivered; five Business Days after being deposited in the mail, postage
prepaid, if mailed; when receipt acknowledged, if telecopied; and the next
Business Day after timely delivery to the courier, if sent by overnight air
courier guaranteeing next day delivery.

      Any notice or communication to a Holder shall be mailed by first class
mail, certified or registered, return receipt requested, or by overnight air
courier guaranteeing next day delivery to its address shown on the register kept
by the Registrar.  Any notice or communication shall also be so mailed to any
Person described in TIA (S) 313(c), to the extent required by the TIA.  Failure
to mail a notice or communication to a Holder or any defect in it shall not
affect its sufficiency with respect to other Holders.

      If a notice or communication is mailed in the manner provided above within
the time prescribed, it is duly given, whether or not the addressee receives it.

                                       83

 
      If the Company mails a notice or communication to Holders, it shall mail a
copy to the Trustee and each Agent at the same time.

Section 12.03.  Communication by Holders of Notes with Other Holders of Notes.

      Holders may communicate pursuant to TIA (S) 312(b) with other Holders with
respect to their rights under this Indenture or the Notes.  The Company, the
Trustee, the Registrar and anyone else shall have the protection of TIA (S)
312(c).

Section 12.04.  Certificate and Opinion as to Conditions Precedent.

      Upon any request or application by the Company to the Trustee to take any
action under this Indenture, the Company shall furnish to the Trustee:

      (a) an Officers' Certificate in form and substance reasonably satisfactory
to the Trustee (which shall include the statements set forth in Section 12.05
hereof) stating that, in the opinion of the signers, all conditions precedent
and covenants, if any, provided for in this Indenture relating to the proposed
action have been satisfied; and

      (b) an Opinion of Counsel in form and substance reasonably satisfactory to
the Trustee (which shall include the statements set forth in Section 12.05
hereof) stating that, in the opinion of such counsel, all such conditions
precedent and covenants have been satisfied.

Section 12.05.  Statements Required in Certificate or Opinion.

      Each certificate or opinion with respect to compliance with a condition or
covenant provided for in this Indenture (other than a certificate provided
pursuant to TIA (S) 314(a)(4)) shall comply with the provisions of TIA (S)
314(e) and shall include:

      (a) a statement that the Person making such certificate or opinion has
read such covenant or condition;

      (b) a brief statement as to the nature and scope of the examination or
investigation upon which the statements or opinions contained in such
certificate or opinion are based;

      (c) a statement that, in the opinion of such Person, he or she has made
such examination or investigation as is necessary to enable him to express an
informed opinion as to whether or not such covenant or condition has been
satisfied; and

      (d) a statement as to whether or not, in the opinion of such Person, such
condition or covenant has been satisfied.

Section 12.06.  Rules by Trustee and Agents.

      The Trustee may make reasonable rules for action by or at a meeting of
Holders.  The Registrar or Paying Agent may make reasonable rules and set
reasonable requirements for its functions.

                                       84

 
Section 12.07.  No Personal Liability of Directors, Officers, Employees and
Stockholders.

      No past, present or future director, officer, employee, incorporator or
stockholder of the Company or any Subsidiary Guarantor, as such, shall have any
liability for any obligations of the Company or such Subsidiary Guarantor under
the Notes, the Subsidiary Guarantees, this Indenture or for any claim based on,
in respect of, or by reason of, such obligations or their creation.  Each Holder
by accepting a Note waives and releases all such liability.  The waiver and
release are part of the consideration for issuance of the Notes.

Section 12.08.  Governing Law.

      THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO
CONSTRUE THIS INDENTURE, THE NOTES AND THE SUBSIDIARY GUARANTEES WITHOUT GIVING
EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE
APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY.

Section 12.09.  No Adverse Interpretation of Other Agreements.

      This Indenture may not be used to interpret any other indenture, loan or
debt agreement of the Company or its Subsidiaries or of any other Person.  Any
such indenture, loan or debt agreement may not be used to interpret this
Indenture.

Section 12.10.  Successors.

      All agreements of the Company in this Indenture and the Notes shall bind
its successors.  All agreements of the Trustee in this Indenture shall bind its
successors.  All agreements of each Subsidiary Guarantor in this Indenture shall
bind its successors, except as otherwise provided in Section 11.06.

Section 12.11.  Severability.

      In case any provision in this Indenture or in the Notes shall be invalid,
illegal or unenforceable, the validity, legality and enforceability of the
remaining provisions shall not in any way be affected or impaired thereby.

Section 12.12.  Counterpart Originals.

      The parties may sign any number of copies of this Indenture.  Each signed
copy shall be an original, but all of them together represent the same
agreement.

Section 12.13.  Table of Contents, Headings, etc.

      The Table of Contents, Cross-Reference Table and Headings of the Articles
and Sections of this Indenture have been inserted for convenience of reference
only, are not to be considered a part of this Indenture and shall in no way
modify or restrict any of the terms or provisions hereof.

                                       85

 
                        [Signatures on following page]

                                       86

 
                                  SIGNATURES

Dated as of August 19, 1998

                                  GREAT LAKES DREDGE & DOCK CORPORATION

                                  By: /s/ Douglas B. Mackie
                                      ---------------------
                                  Name: Douglas B. Mackie
                                  Title: President and C.E.O.

                                  GREAT LAKES INTERNATIONAL, INC.

                                  By: /s/ Douglas B. Mackie
                                      ---------------------
                                  Name: Douglas B. Mackie
                                  Title: President and C.E.O.

                                  GREAT LAKES DREDGE & DOCK COMPANY

                                  By: /s/ Douglas B. Mackie
                                      ---------------------
                                  Name: Douglas B. Mackie
                                  Title: President and C.E.O.

                                  DAWSON DREDGING

                                  By: /s/ Douglas B. Mackie
                                      ---------------------
                                  Name: Douglas B. Mackie
                                  Title: President and C.E.O.

                                  FIFTY-THREE DREDGING CORPORATION

                                  By: /s/ Douglas B. Mackie
                                      ---------------------
                                  Name: Douglas B. Mackie
                                  Title: President and C.E.O.

 
                                 GATES CONSTRUCTION CORP.

                                 By: /s/ Douglas B. Mackie
                                     ---------------------
                                 Name: Douglas B. Mackie
                                 Title: President and C.E.O.

                                 THE BANK OF NEW YORK, AS TRUSTEE

                                 By: /s/ Iliana Acevedo
                                     ------------------
                                 Name: Iliana Acevedo
                                 Title: Assistant Treasurer

 
                                                                   EXHIBIT A1

                                [Face of Note]
- --------------------------------------------------------------------------------

                                                            CUSIP/CINS 390606AA9

        11 1/4% [Series A] [Series B] Senior Subordinated Notes due 2008

No.  ___                                                            $115,000,000

                     GREAT LAKES DREDGE & DOCK CORPORATION

promises to pay to Cede & Co., or registered assigns, the principal sum of One
Hundred Fifteen Million Dollars on August 19, 2008.

Interest Payment Dates:  February 15 and August 15

Record Dates:  February 1 and August 1

Dated: August 19, 1998

                                 GREAT LAKES DREDGE & DOCK CORPORATION

                                 By:____________________________________
                                 Name:
                                 Title:


This is one of the Notes referred to
in the within-mentioned Indenture:

THE BANK OF NEW YORK,

 as Trustee

By:________________________________
Name:
Title:

- --------------------------------------------------------------------------------

                                     A1-1

 
                                [Back of Note]

       11 1/4% [Series A] [Series B] Senior Subordinated Notes due 2008

THIS GLOBAL NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THE INDENTURE
GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE BENEFIT OF THE BENEFICIAL
OWNERS HEREOF, AND IS NOT TRANSFERABLE TO ANY PERSON UNDER ANY CIRCUMSTANCES
EXCEPT THAT (I) THE TRUSTEE MAY MAKE SUCH NOTATIONS HEREON AS MAY BE REQUIRED
PURSUANT TO SECTION 2.07 OF THE INDENTURE, (II) THIS GLOBAL NOTE MAY BE
EXCHANGED IN WHOLE BUT NOT IN PART PURSUANT TO SECTION 2.06(a) OF THE INDENTURE,
(III) THIS GLOBAL NOTE MAY BE DELIVERED TO THE TRUSTEE FOR CANCELLATION PURSUANT
TO SECTION 2.11 OF THE INDENTURE AND (IV) THIS GLOBAL NOTE MAY BE TRANSFERRED TO
A SUCCESSOR DEPOSITARY WITH THE PRIOR WRITTEN CONSENT OF THE COMPANY.

THE SECURITY (OR ITS PREDECESSOR) EVIDENCED HEREBY WAS ORIGINALLY ISSUED IN A
TRANSACTION EXEMPT FROM REGISTRATION UNDER SECTION 5 OF THE UNITED STATES
SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), AND THE SECURITY
EVIDENCED HEREBY MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED IN THE
ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION THEREFROM.  EACH
PURCHASER OF THE SECURITY EVIDENCED HEREBY IS HEREBY NOTIFIED THAT THE SELLER
MAY BE RELYING ON THE EXEMPTION FROM THE PROVISIONS OF SECTION 5 OF THE
SECURITIES ACT PROVIDED BY RULE 144A OR REGULATION S THEREUNDER.  THE HOLDER OF
THE SECURITY EVIDENCED HEREBY AGREES FOR THE BENEFIT OF THE COMPANY THAT (A)
SUCH SECURITY MAY BE RESOLD, PLEDGED OR OTHERWISE TRANSFERRED, ONLY (1)(a) IN
THE UNITED STATES TO A PERSON WHOM THE SELLER REASONABLY BELIEVES IS A QUALIFIED
INSTITUTIONAL BUYER (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) IN A
TRANSACTION MEETING THE REQUIREMENTS OF RULE 144A, (b) IN A TRANSACTION MEETING
THE REQUIREMENTS OF RULE 144 UNDER THE SECURITIES ACT, (c) OUTSIDE THE UNITED
STATES TO A NON U.S. PERSON IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE
904 UNDER THE SECURITIES ACT, (d) TO AN INSTITUTIONAL "ACCREDITED INVESTOR" AS
DEFINED IN RULE 501(A)(1), (2), (3) OR (7) OF THE SECURITIES ACT (AN
"INSTITUTIONAL ACCREDITED INVESTOR") THAT, PRIOR TO SUCH TRANSFER, FURNISHES THE
TRUSTEE A SIGNED LETTER CONTAINING CERTAIN REPRESENTATIONS AND AGREEMENTS (THE
FORM OF WHICH CAN BE OBTAINED FROM THE TRUSTEE) AND, IF SUCH TRANSFER IS IN
RESPECT OF AN AGGREGATE PRINCIPAL AMOUNT OF SECURITIES LESS THAN $250,000, AN
OPINION OF COUNSEL THAT SUCH TRANSFER IS IN COMPLIANCE WITH THE SECURITIES ACT
OR (e) IN ACCORDANCE WITH ANOTHER EXEMPTION FROM THE REGISTRATION REQUIREMENTS
OF THE SECURITIES ACT (AND BASED UPON AN OPINION OF COUNSEL IF THE COMPANY SO
REQUESTS), (2) TO THE COMPANY OR (3) PURSUANT TO AN EFFECTIVE REGISTRATION
STATEMENT AND, IN EACH CASE, IN ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS
OF ANY STATE OF THE UNITED STATES OR ANY OTHER APPLICABLE JURISDICTION AND (B)
THE HOLDER WILL, AND EACH SUBSEQUENT HOLDER IS REQUIRED TO, NOTIFY ANY

                                     A1-2

 
PURCHASER FROM IT OF THE SECURITY EVIDENCED HEREBY OF THE RESALE RESTRICTIONS
SET FORTH IN (A) ABOVE.

      Capitalized terms used herein shall have the meanings assigned to them in
the Indenture referred to below unless otherwise indicated.

      1.  Interest.  Great Lakes Dredge & Dock Corporation, a Delaware
corporation (the "Company"), promises to pay interest on the principal amount of
this Note at 11 1/4% per annum from August 19, 1998 until maturity and shall pay
the Liquidated Damages payable pursuant to Section 5 of the Registration Rights
Agreement referred to below. The Company will pay interest and Liquidated
Damages semi-annually in arrears on February 15 and August 15 of each year, or
if any such day is not a Business Day, on the next succeeding Business Day (each
an "Interest Payment Date"). Interest on the Notes will accrue from the most
recent date to which interest has been paid or, if no interest has been paid,
from the date of issuance; provided that if there is no existing Default in the
payment of interest, and if this Note is authenticated between a record date
referred to on the face hereof and the next succeeding Interest Payment Date,
interest shall accrue from such next succeeding Interest Payment Date; provided,
further, that the first Interest Payment Date shall be February 15, 1999. The
Company shall pay interest (including post-petition interest in any proceeding
under any Bankruptcy Law) on overdue principal and premium, if any, from time to
time on demand at a rate that is 1% per annum in excess of the rate then in
effect; it shall pay interest (including post-petition interest in any
proceeding under any Bankruptcy Law) on overdue installments of interest and
Liquidated Damages (without regard to any applicable grace periods) from time to
time on demand at the same rate to the extent lawful. Interest will be computed
on the basis of a 360-day year of twelve 30-day months.

      2.  Method of Payment.  The Company will pay interest on the Notes (except
defaulted interest) and Liquidated Damages to the Persons who are registered
Holders of Notes at the close of business on the February 1 or August 1 next
preceding the Interest Payment Date, even if such Notes are canceled after such
record date and on or before such Interest Payment Date, except as provided in
Section 2.12 of the Indenture with respect to defaulted interest. The Notes will
be payable as to principal, premium and Liquidated Damages, if any, and interest
at the office or agency of the Company maintained for such purpose within or
without the City and State of New York, or, at the option of the Company,
payment of interest and Liquidated Damages may be made by check mailed to the
Holders at their addresses set forth in the register of Holders, and provided
that payment by wire transfer of immediately available funds will be required
with respect to principal of and interest, premium and Liquidated Damages on,
all Global Notes and all other Notes the Holders of which shall have provided
wire transfer instructions to the Company or the Paying Agent. Such payment
shall be in such coin or currency of the United States of America as at the time
of payment is legal tender for payment of public and private debts.

      3.  Paying Agent and Registrar. Initially, The Bank of New York, the
Trustee under the Indenture, will act as Paying Agent and Registrar. The Company
may change any Paying Agent or Registrar without notice to any Holder. The
Company or any of its Subsidiaries may act in any such capacity.

                                     A1-3

 
      4.  Indenture. The Company issued the Notes under an Indenture dated as of
August 19, 1998 ("Indenture") between the Company and the Trustee. The terms of
the Notes include those stated in the Indenture and those made part of the
Indenture by reference to the Trust Indenture Act of 1939, as amended (15 U.S.
Code (S)(S) 77aaa-77bbbb). The Notes are subject to all such terms, and Holders
are referred to the Indenture and such Act for a statement of such terms. To the
extent any provision of this Note conflicts with the express provisions of the
Indenture, the provisions of the Indenture shall govern and be controlling. The
Notes are obligations of the Company limited to $115.0 million in aggregate
principal amount.

      5.  Optional Redemption.

      (a) Except as set forth in clause (b) of this Paragraph 5, the Company
shall not have the option to redeem the Notes pursuant to this Paragraph 5 prior
to August 15, 2003.  Thereafter, the Company shall have the option to redeem the
Notes, in whole or in part, upon not less than 30 nor more than 60 days' notice,
in cash at the redemption prices (expressed as percentages of principal amount)
set forth below plus accrued and unpaid interest and Liquidated Damages thereon,
if any, to the applicable redemption date, if redeemed during the twelve-month
period beginning on August 15 of the years indicated below:

     Year                                                 Percentage
     ----                                                 ----------

     2003..............................................   105.625%
     2004..............................................   103.750%
     2005..............................................   101.875%
     2006 and thereafter...............................   100.000%

      (b) Notwithstanding the provisions of subparagraph (a) of this Paragraph
5, at any time prior to August 15, 2001, the Company may (but will not have the
obligation to) on any one or more occasions redeem up to 35% of the aggregate
principal amount of Notes originally issued at a redemption price equal to
111.250% of the principal amount thereof, plus accrued and unpaid interest and
Liquidated Damages, if any, thereon to the redemption date, with the net cash
proceeds of one or more Public Equity Offerings; provided that at least 65% of
the aggregate principal amount of Notes originally issued remain outstanding
immediately after the occurrence of such redemption (excluding Notes held by the
Company and its Subsidiaries); and provided, further, that such redemption shall
occur within 180 days of the date of the closing of such Public Equity Offering.

      6.  Mandatory Redemption.

      Except as set forth in paragraph 7 below, the Company shall not be
required to make mandatory redemption payments with respect to the Notes.

      7.  Repurchase At Option Of Holder.

      (a) If there is a Change of Control, the Company shall be required to make
an offer (a "Change of Control Offer") to repurchase all or any part (equal to
$1,000 or an integral multiple thereof)

                                     A1-4

 
of each Holder's Notes at a purchase price equal to 101% of the aggregate
principal amount thereof plus accrued and unpaid interest and Liquidated Damages
thereon, if any, to the date of purchase (the "Change of Control Payment").
Within 30 days following any Change of Control, the Company shall mail a notice
to each Holder setting forth the procedures governing the Change of Control
Offer as required by the Indenture.

      (b) If the Company or a Subsidiary consummates any Asset Sales, within
five days of each date on which the aggregate amount of Excess Proceeds exceeds
$10.0 million, the Company shall commence an offer to all Holders of Notes (as
"Asset Sale Offer") pursuant to Section 3.09 of the Indenture to purchase the
maximum principal amount of Notes (including any Additional Notes) that may be
purchased out of the Excess Proceeds at an offer price in cash in an amount
equal to 100% of the principal amount thereof plus accrued and unpaid interest
and Liquidated Damages thereon, if any, to the date fixed for the closing of
such offer, in accordance with the procedures set forth in the Indenture.  To
the extent that the aggregate amount of Notes (including any Additional Notes)
tendered pursuant to an Asset Sale Offer is less than the Excess Proceeds, the
Company (or such Subsidiary) may use such deficiency for general corporate
purposes.  If the aggregate principal amount of Notes surrendered by Holders
thereof exceeds the amount of Excess Proceeds, the Trustee shall select the
Notes to be purchased on a pro rata basis.  Holders of Notes that are the
subject of an offer to purchase will receive an Asset Sale Offer from the
Company prior to any related purchase date and may elect to have such Notes
purchased by completing the form entitled "Option of Holder to Elect Purchase"
on the reverse of the Notes.

      8.  Notice Of Redemption.  Notice of redemption will be mailed at least 30
days but not more than 60 days before the redemption date to each Holder whose
Notes are to be redeemed at its registered address.  Notes in denominations
larger than $1,000 may be redeemed in part but only in whole multiples of
$1,000, unless all of the Notes held by a Holder are to be redeemed.  On and
after the redemption date interest ceases to accrue on Notes or portions thereof
called for redemption.

      9.  Denominations, Transfer, Exchange.  The Notes are in registered form
without coupons in denominations of $1,000 and integral multiples of $1,000.
The transfer of Notes may be registered and Notes may be exchanged as provided
in the Indenture.  The Registrar and the Trustee may require a Holder, among
other things, to furnish appropriate endorsements and transfer documents and the
Company may require a Holder to pay any taxes and fees required by law or
permitted by the Indenture.  The Company need not exchange or register the
transfer of any Note or portion of a Note selected for redemption, except for
the unredeemed portion of any Note being redeemed in part.  Also, the Company
need not exchange or register the transfer of any Notes for a period of 15 days
before a selection of Notes to be redeemed or during the period between a record
date and the corresponding Interest Payment Date.

      10.  Persons Deemed Owners.  The registered Holder of a Note may be
treated as its owner for all purposes.

      11.  Amendment, Supplement And Waiver.  Subject to certain exceptions, the
Indenture , the Subsidiary Guarantees or the Notes may be amended or
supplemented with the consent of the Holders of at least a majority in principal
amount of the then outstanding Notes and Additional Notes, if any, voting

                                     A1-5

 
as a single class, and any existing default or compliance with any provision of
the Indenture, the Subsidiary Guarantees or the Notes may be waived with the
consent of the Holders of a majority in principal amount of the then outstanding
Notes and Additional Notes, if any, voting as a single class. Without the
consent of any Holder of a Note, the Indenture , the Subsidiary Guarantees or
the Notes may be amended or supplemented to cure any ambiguity, defect or
inconsistency, to provide for uncertificated Notes in addition to or in place of
certificated Notes, to provide for the assumption of the Company's [or
Guarantor's] obligations to Holders of the Notes in case of a merger or
consolidation, to make any change that would provide any additional rights or
benefits to the Holders of the Notes or that does not adversely affect the legal
rights under the Indenture of any such Holder, to comply with the requirements
of the SEC in order to effect or maintain the qualification of the Indenture
under the Trust Indenture Act, to provide for the Issuance of Additional Notes
in accordance with the limitations set forth in the Indenture, or to allow any
Subsidiary Guarantor to execute a supplemental indenture to the Indenture and/or
a Subsidiary Guarantee with respect to the Notes.

      12.  Defalts And Remedies.  Events of Default include: (i) default for 30
days in the payment when due of interest on, or Liquidated Damages with respect
to, the Notes (whether or not permitted by the subordination provisions of the
Indenture); (ii) default in payment when due of the principal of or premium, if
any, on the Notes (whether or not permitted by the subordination provisions of
the Indenture); (iii) failure by the Company or any of its Restricted
Subsidiaries to comply with Section 4.15 of the Indenture; (iv) failure by the
Company or any of its Restricted Subsidiaries for 60 days after notice by the
Trustee or by the Holders of at least 25% in principal amount of Notes then
outstanding to comply with any of its other agreements in the Indenture or the
Notes; (v) default under any mortgage, indenture or instrument under which there
may be issued or by which there may be secured or evidenced any Indebtedness for
money borrowed by the Company or any of its Restricted Subsidiaries (or the
payment of which is guaranteed by the Company or any of its Restricted
Subsidiaries) whether such Indebtedness or guarantee now exists, or is created
after the date of the Indenture, which default (a) is caused by a failure to pay
principal of or premium, if any, or interest on such Indebtedness prior to the
expiration of the grace period provided in such Indebtedness on the date of such
default (a "Payment Default") or (b) results in the acceleration of such
Indebtedness prior to its stated maturity and, in each case, the principal
amount of any such Indebtedness, together with the principal amount of any other
such Indebtedness under which there has been a Payment Default or the maturity
of which has been so accelerated (after giving effect to any applicable grace
period), aggregates $10.0 million or more; (vi) failure by the Company or any of
its Restricted Subsidiaries to pay final judgments aggregating in excess of
$10.0 million (net of any amount with respect to which a reputable insurance
company with assets over $100.0 million has acknowledged liability in writing),
which judgments are not paid, discharged or stayed for a period of 60 days after
their entry; (vii) certain events of bankruptcy or insolvency with respect to
the Company or any of its Subsidiaries and (viii) except as permitted by the
Indenture, any Subsidiary Guarantee shall be held in any judicial proceeding to
be unenforceable or invalid or shall cease for any reason to be in full force
and effect or any Subsidiary Guarantor, or any Person acting on behalf of any
Subsidiary Guarantor, shall deny or disaffirm its obligations under its
Subsidiary Guarantee.  If any Event of Default occurs and is continuing, the
Trustee or the Holders of at least 25% in principal amount of the then
outstanding Notes may declare all the Notes to be due and payable.
Notwithstanding the foregoing, in the case of an Event of Default arising from
certain events of bankruptcy or insolvency, all outstanding Notes will become
due and payable without further action or notice.  Holders may not enforce the
Indenture or the Notes except as provided

                                     A1-6

 
in the Indenture. Subject to certain limitations, Holders of a majority in
principal amount of the then outstanding Notes may direct the Trustee in its
exercise of any trust or power. The Trustee may withhold from Holders of the
Notes notice of any continuing Default or Event of Default (except a Default or
Event of Default relating to the payment of principal or interest) if it
determines that withholding notice is in their interest. The Holders of a
majority in aggregate principal amount of the Notes then outstanding by notice
to the Trustee may on behalf of the Holders of all of the Notes waive any
existing Default or Event of Default and its consequences under the Indenture
except a continuing Default or Event of Default in the payment of interest on,
or the principal of, the Notes. The Company is required to deliver to the
Trustee annually a statement regarding compliance with the Indenture, and the
Company is required upon becoming aware of any Default or Event of Default, to
deliver to the Trustee a statement specifying such Default or Event of Default.

      13. Trustee Dealings With Company. The Trustee, in its individual or any
other capacity, may make loans to, accept deposits from, and perform services
for the Company or its Affiliates, and may otherwise deal with the Company or
its Affiliates, as if it were not the Trustee.

      14.  No Recourse Against Others.  A director, officer, employee,
incorporator or stockholder, of the Company or any of the Subsidiary Guarantors,
as such, shall not have any liability for any obligations of the Company or such
Subsidiary Guarantor under the Notes, the Subsidiary Guarantees or the Indenture
or for any claim based on, in respect of, or by reason of, such obligations or
their creation.  Each Holder by accepting a Note waives and releases all such
liability.  The waiver and release are part of the consideration for the
issuance of the Notes.

      15.  Authentication.  This Note shall not be valid until authenticated by
the manual signature of the Trustee or an authenticating agent.

      16.  Abbreviations.  Customary abbreviations may be used in the name of a
Holder or an assignee, such as: TEN COM (= tenants in common), TEN ENT (=
tenants by the entireties), JT TEN (= joint tenants with right of survivorship
and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts
to Minors Act).

      17.  Additional Rights Of Holders Of Restricted Global Notes And
Restricted Definitive Notes.  In addition to the rights provided to Holders of
Notes under the Indenture, Holders of Restricted Global Notes and Restricted
Definitive Notes shall have all the rights set forth in the A/B Exchange
Registration Rights Agreement dated as of August 19, 1998, among the Company and
the parties named on the signature pages thereof or, in the case of Additional
Notes, Holders of Restricted Global Notes and Restricted Definitive Notes shall
have the rights set forth in one or more registration rights agreements, if any,
between the Company and the other parties thereto, relating to rights given by
the Company to the purchasers of any Additional Notes (collectively, the
"Registration Rights Agreement").

      18.  Cusip Numbers.  Pursuant to a recommendation promulgated by the
Committee on Uniform Security Identification Procedures, the Company has caused
CUSIP numbers to be printed on the Notes and the Trustee may use CUSIP numbers
in notices of redemption as a convenience to Holders.  No representation is made
as to the accuracy of such numbers either as printed on the Notes or as

                                     A1-7

 
contained in any notice of redemption and reliance may be placed only on the
other identification numbers placed thereon.

      The Company will furnish to any Holder upon written request and without
charge a copy of the Indenture and/or the Registration Rights Agreement.
Requests may be made to:

Great Lakes Dredge & Dock Corporation
2122 York Road
Oak Brook, Illinois  60521
Attention:  President

                                     A1-8

 
                                ASSIGNMENT FORM

      To assign this Note, fill in the form below:

(I) or (we) assign and transfer this Note to:___________________________________

                                              (Insert assignee's legal name)

________________________________________________________________________________
                (Insert assignee's soc.  sec.  or tax I.D.  no.)


________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________
             (Print or type assignee's name, address and zip code)

and irrevocably appoint_________________________________________________________

to transfer this Note on the books of the Company.  The agent may substitute
another to act for him.

Date:_______________

                                    Your Signature:_____________________________

                                          (Sign exactly as your name appears on 
                                           the face of this Note)

Signature Guarantee*:_____________________


*  Participant in a recognized Signature Guarantee Medallion Program (or other
signature guarantor acceptable to the Trustee).

                                     A1-9

 
                      OPTION OF HOLDER TO ELECT PURCHASE

      If you want to elect to have this Note purchased by the Company pursuant
to Section 4.10 or 4.15 of the Indenture, check the appropriate box below:

               [_] Section 4.10            [_] Section 4.15

      If you want to elect to have only part of the Note purchased by the
Company pursuant to Section 4.10 or Section 4.15 of the Indenture, state the
amount you elect to have purchased:

                         $_______________________

Date:______________

                              Your Signature:_______________________________

                                      (Sign exactly as your name appears on the
                                      face of this Note)

                              Tax Identification No.:________________________

Signature Guarantee*:__________________________


*  Participant in a recognized Signature Guarantee Medallion Program (or other
signature guarantor acceptable to the Trustee).

                                     A1-10

 
            SCHEDULE OF EXCHANGES OF INTERESTS IN THE GLOBAL NOTE*

      The following exchanges of a part of this Global Note for an interest in
another Global Note or for a Definitive Note, or exchanges of a part of another
Global Note or Definitive Note for an interest in this Global Note, have been
made:

 

                                                                      Principal Amount        Signature of
                        Amount of decrease     Amount of increase    of this Global Note    authorized officer
                               in                     in               following such              of
                         Principal Amount       Principal Amount          decrease           Trustee or Note
 Date of Exchange      of this Global Note    of this Global Note       (or increase)            Custodian
- -------------------    --------------------  ----------------------  -------------------     ------------------
                                                                                   
 




*  This schedule should be included only if the Note is issued in global form.

                                     A1-11

 
                 [Face of Regulation S Temporary Global Note]
- --------------------------------------------------------------------------------

                                                           CUSIP/CINS __________

        11 1/4% [Series A] [Series B] Senior Subordinated Notes due 2008

No.  ___                                                             $__________

                     GREAT LAKES DREDGE & DOCK CORPORATION

promises to pay to______________________________________________________________

or registered assigns,

the principal sum oF____________________________________________________________

Dollars on August 19, 2008.

Interest Payment Dates:  February 15, and August 15

Record Dates:  February 1, and August 1

Dated: August ___, 1998

                                 Great Lakes Dredge & Dock Corporation

                                 By: ____________________________________
                                     Name:
                                     Title:

This is one of the Notes referred to
in the within-mentioned Indenture:

THE BANK OF NEW YORK,
 as Trustee

By: __________________________________
      Authorized Signatory


- --------------------------------------------------------------------------------

                                     A2-1

 
                 [Back of Regulation S Temporary Global Note]

       11 1/4% [Series A] [Series B] Senior Subordinated Notes due 2008

THE RIGHTS ATTACHING TO THIS REGULATION S TEMPORARY GLOBAL NOTE, AND THE
CONDITIONS AND PROCEDURES GOVERNING ITS EXCHANGE FOR CERTIFICATED NOTES, ARE AS
SPECIFIED IN THE INDENTURE (AS DEFINED HEREIN).  NEITHER THE HOLDER NOR THE
BENEFICIAL OWNERS OF THIS REGULATION S TEMPORARY GLOBAL NOTE SHALL BE ENTITLED
TO RECEIVE PAYMENT OF INTEREST HEREON.

UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR NOTES IN DEFINITIVE
FORM, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITARY TO A
NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR
ANOTHER NOMINEE OF THE DEPOSITARY OR BY THE DEPOSITARY OR ANY SUCH NOMINEE TO A
SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITARY.  UNLESS THIS
CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST
COMPANY (55 WATER STREET, NEW YORK, NEW YORK) ("DTC"), TO THE COMPANY OR ITS
AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE
ISSUED IS REGISTERED IN THE NAME OF CEDE & CO.  OR SUCH OTHER NAME AS MAY BE
REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO
CEDE & CO.  OR SUCH OTHER ENTITY AS MAY BE REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER
HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

THE SECURITY (OR ITS PREDECESSOR) EVIDENCED HEREBY WAS ORIGINALLY ISSUED IN A
TRANSACTION EXEMPT FROM REGISTRATION UNDER SECTION 5 OF THE UNITED STATES
SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), AND THE SECURITY
EVIDENCED HEREBY MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED IN THE
ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION THEREFROM.  EACH
PURCHASER OF THE SECURITY EVIDENCED HEREBY IS HEREBY NOTIFIED THAT THE SELLER
MAY BE RELYING ON THE EXEMPTION FROM THE PROVISIONS OF SECTION 5 OF THE
SECURITIES ACT PROVIDED BY RULE 144A OR REGULATION S THEREUNDER.  THE HOLDER OF
THE SECURITY EVIDENCED HEREBY AGREES FOR THE BENEFIT OF THE COMPANY THAT (A)
SUCH SECURITY MAY BE RESOLD, PLEDGED OR OTHERWISE TRANSFERRED, ONLY (1)(a) IN
THE UNITED STATES TO A PERSON WHOM THE SELLER REASONABLY BELIEVES IS A QUALIFIED
INSTITUTIONAL BUYER (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) IN A
TRANSACTION MEETING THE REQUIREMENTS OF RULE 144A, (b) IN A TRANSACTION MEETING
THE REQUIREMENTS OF RULE 144 UNDER THE SECURITIES ACT, (c) OUTSIDE THE UNITED
STATES TO A NON U.S. PERSON IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE
904 UNDER THE SECURITIES ACT, (d) TO AN INSTITUTIONAL "ACCREDITED INVESTOR" AS
DEFINED IN RULE 501(A)(1), (2), (3) OR (7) OF THE SECURITIES ACT (AN
"INSTITUTIONAL ACCREDITED INVESTOR") THAT, PRIOR TO SUCH

                                     A2-2

 
TRANSFER, FURNISHES THE TRUSTEE A SIGNED LETTER CONTAINING CERTAIN
REPRESENTATIONS AND AGREEMENTS (THE FORM OF WHICH CAN BE OBTAINED FROM THE
TRUSTEE) AND, IF SUCH TRANSFER IS IN RESPECT OF AN AGGREGATE PRINCIPAL AMOUNT OF
SECURITIES LESS THAN $250,000, AN OPINION OF COUNSEL THAT SUCH TRANSFER IS IN
COMPLIANCE WITH THE SECURITIES ACT OR (e) IN ACCORDANCE WITH ANOTHER EXEMPTION
FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT (AND BASED UPON AN
OPINION OF COUNSEL IF THE COMPANY SO REQUESTS), (2) TO THE COMPANY OR (3)
PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT AND, IN EACH CASE, IN ACCORDANCE
WITH ANY APPLICABLE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES OR ANY
OTHER APPLICABLE JURISDICTION AND (B) THE HOLDER WILL, AND EACH SUBSEQUENT
HOLDER IS REQUIRED TO, NOTIFY ANY PURCHASER FROM IT OF THE SECURITY EVIDENCED
HEREBY OF THE RESALE RESTRICTIONS SET FORTH IN (A) ABOVE.

      Capitalized terms used herein shall have the meanings assigned to them in
the Indenture referred to below unless otherwise indicated.

      1.  Interest.  Great Lakes Dredge & Dock Corporation, a Delaware
corporation (the "Company"), promises to pay interest on the principal amount of
this Note at 11 1/4% per annum from August 19, 1998 until maturity and shall pay
the Liquidated Damages payable pursuant to Section 5 of the Registration Rights
Agreement referred to below.  The Company will pay interest and Liquidated
Damages semi-annually on February 15 and August 15 of each year, or if any such
day is not a Business Day, on the next succeeding Business Day (each an
"Interest Payment Date").  Interest on the Notes will accrue from the most
recent date to which interest has been paid or, if no interest has been paid,
from the date of issuance; provided that if there is no existing Default in the
payment of interest, and if this Note is authenticated between a record date
referred to on the face hereof and the next succeeding Interest Payment Date,
interest shall accrue from such next succeeding Interest Payment Date; provided,
further, that the first Interest Payment Date shall be February 15, 1999.  The
Company shall pay interest (including post-petition interest in any proceeding
under any Bankruptcy Law) on overdue principal and premium, if any, from time to
time on demand at a rate that is 1% per annum in excess of the rate then in
effect; it shall pay interest (including post-petition interest in any
proceeding under any Bankruptcy Law) on overdue installments of interest and
Liquidated Damages (without regard to any applicable grace periods) from time to
time on demand at the same rate to the extent lawful.  Interest will be computed
on the basis of a 360-day year of twelve 30-day months.

      Until this Regulation S Temporary Global Note is exchanged for one or more
Regulation S Permanent Global Notes, the Holder hereof shall not be entitled to
receive payments of interest hereon; until so exchanged in full, this Regulation
S Temporary Global Note shall in all other respects be entitled to the same
benefits as other Senior Subordinated Notes under the Indenture.

      2.  Method of Payment.  The Company will pay interest on the Notes 
(except defaulted interest) and Liquidated Damages to the Persons who are
registered Holders of Notes at the close of business on the August 1 or February
1 next preceding the Interest Payment Date, even if such Notes are canceled
after such record date and on or before such Interest Payment Date, except as
provided in Section 2.12 of the Indenture with respect to defaulted interest.
The Notes will be payable as to 

                                     A2-3

 
principal, premium, interest and Liquidated Damages at the office or agency of
the Company maintained for such purpose within or without the City and State of
New York, or, at the option of the Company, payment of interest and Liquidated
Damages may be made by check mailed to the Holders at their addresses set forth
in the register of Holders, and provided that payment by wire transfer of
[immediately available/next day] funds will be required with respect to
principal of and interest, premium and Liquidated Damages on, all Global Notes
and all other Notes the Holders of which shall have provided wire transfer
instructions to the Company or the Paying Agent. Such payment shall be in such
coin or currency of the United States of America as at the time of payment is
legal tender for payment of public and private debts.

      3.  Paying Agent and Registrar.  Initially, The Bank of New York, the 
Trustee under the Indenture, will act as Paying Agent and Registrar. The Company
may change any Paying Agent or Registrar without notice to any Holder. The
Company or any of its Subsidiaries may act in any such capacity.

      4.  Indenture.  The Company issued the Notes under an Indenture dated as 
of August 19, 1998 ("Indenture") between the Company and the Trustee. The terms
of the Notes include those stated in the Indenture and those made part of the
Indenture by reference to the Trust Indenture Act of 1939, as amended (15 U.S.
Code (S)(S) 77aaa-77bbbb). The Notes are subject to all such terms, and Holders
are referred to the Indenture and such Act for a statement of such terms. To the
extent this Note conflicts with the express provisions of the Indenture, the
provisions of the Indenture shall govern and be controlling. The Notes are
obligations of the Company limited to $115.0 million in aggregate principal
amount.

      5.  Optional Redemption.

      (a) Except as set forth in clause (b) of this Paragraph 5, the Company
shall not have the option to redeem the Notes pursuant to this Paragraph 5 prior
to August 15, 2003.  Thereafter, the Company shall have the option to redeem the
Notes, in whole or in part, upon not less than 30 nor more than 60 days' notice,
in cash at the redemption prices (expressed as percentages of principal amount)
set forth below plus accrued and unpaid interest and Liquidated Damages thereon,
if any, to the applicable redemption date, if redeemed during the twelve-month
period beginning on August 15 of the years indicated below:



Year                                                                                Percentage
- ----                                                                                ----------
                                                                                 
2003...........................................................................       105.625%
2004...........................................................................       103.750%
2005...........................................................................       101.875%
2006 and thereafter............................................................       100.000%


      (b) Notwithstanding the provisions of subparagraph (a) of this Paragraph
5, at any time prior to August 15, 2001, the Company may (but will not have the
obligation to) on any one or more occasions redeem up to 35% of the aggregate
principal amount of Notes originally issued at a redemption price equal to
111.250% of the principal amount thereof, plus accrued and unpaid interest and
Liquidated 

                                     A2-4

 
Damages, if any, thereon to the redemption date, with the net cash proceeds of
one or more Public Equity Offerings; provided that at least 65% of the aggregate
principal amount of Notes originally issued remain outstanding immediately after
the occurrence of such redemption (excluding Notes held by the Company and its
Subsidiaries); and provided, further, that such redemption shall occur within
180 days of the date of the closing of such Public Equity Offering.

      6.  Mandatory Redemption.

      Except as set forth in paragraph 7 below, the Company shall not be
required to make mandatory redemption payments with respect to the Notes.

      7.  Repurchase at Option of Holder.

      (a) If there is a Change of Control, the Company shall be required to make
an offer (a "Change of Control Offer") to repurchase all or any part (equal to
$1,000 or an integral multiple thereof) of each Holder's Notes at a purchase
price equal to 101% of the aggregate principal amount thereof plus accrued and
unpaid interest, if any, to the date of purchase (the "Change of Control
Payment").  Within 30 days following any Change of Control, the Company shall
mail a notice to each Holder setting forth the procedures governing the Change
of Control Offer as required by the Indenture.

      (b) If the Company or a Subsidiary consummates any Asset Sales, within
five days of each date on which the aggregate amount of Excess Proceeds exceeds
$10.0 million, the Company shall commence an offer to all Holders of Notes (as
"Asset Sale Offer") pursuant to Section 3.09 of the Indenture to purchase the
maximum principal amount of Notes that may be purchased out of the Excess
Proceeds at an offer price in cash in an amount equal to 100% of the principal
amount thereof plus accrued and unpaid interest, if any, to the date fixed for
the closing of such offer, in accordance with the procedures set forth in the
Indenture.  To the extent that the aggregate amount of Notes tendered pursuant
to an Asset Sale Offer is less than the Excess Proceeds, the Company (or such
Subsidiary) may use such deficiency for general corporate purposes.  If the
aggregate principal amount of Notes surrendered by Holders thereof exceeds the
amount of Excess Proceeds, the Trustee shall select the Notes to be purchased on
a pro rata basis.  Holders of Notes that are the subject of an offer to purchase
will receive an Asset Sale Offer from the Company prior to any related purchase
date and may elect to have such Notes purchased by completing the form entitled
"Option of Holder to Elect Purchase" on the reverse of the Notes.

      8.  Notice of Redemption.  Notice of redemption will be mailed at least 30
days but not more than 60 days before the redemption date to each Holder whose
Notes are to be redeemed at its registered address.  Notes in denominations
larger than $1,000 may be redeemed in part but only in whole multiples of
$1,000, unless all of the Notes held by a Holder are to be redeemed.  On and
after the redemption date interest ceases to accrue on Notes or portions thereof
called for redemption.

      9.  Denominations, Transfer, Exchange.  The Notes are in registered form
without coupons in denominations of $1,000 and integral multiples of $1,000.
The transfer of Notes may be registered and Notes may be exchanged as provided
in the Indenture.  The Registrar and the Trustee may require a Holder, among
other things, to furnish appropriate endorsements and transfer documents and 

                                     A2-5

 
the Company may require a Holder to pay any taxes and fees required by law or
permitted by the Indenture. The Company need not exchange or register the
transfer of any Note or portion of a Note selected for redemption, except for
the unredeemed portion of any Note being redeemed in part. Also, it need not
exchange or register the transfer of any Notes for a period of 15 days before a
selection of Notes to be redeemed or during the period between a record date and
the corresponding Interest Payment Date.

      This Regulation S Temporary Global Note is exchangeable in whole or in
part for one or more Global Notes only (i) on or after the termination of the
40-day restricted period (as defined in Regulation S) and (ii) upon presentation
of certificates (accompanied by an Opinion of Counsel, if applicable) required
by Article 2 of the Indenture.  Upon exchange of this Regulation S Temporary
Global Note for one or more Global Notes, the Trustee shall cancel this
Regulation S Temporary Global Note.

      10.  Persons Deemed Owners.  The registered Holder of a Note may be
treated as its owner for all purposes.

      11.  Amendment, Supplement and Waiver.  Subject to certain exceptions, the
Indenture or the Notes may be amended or supplemented with the consent of the
Holders of at least a majority in principal amount of the then outstanding Notes
and Additional Notes, if any, and any existing default or compliance with any
provision of the Indenture, the Subsidiary Guarantees or the Notes may be waived
with the consent of the Holders of a majority in principal amount of the then
outstanding Notes.  Without the consent of any Holder of a Note, the Indenture
or the Notes may be amended or supplemented to cure any ambiguity, defect or
inconsistency, to provide for uncertificated Notes in addition to or in place of
certificated Notes, to provide for the assumption of the Company's obligations
to Holders of the Notes in case of a merger or consolidation, to make any change
that would provide any additional rights or benefits to the Holders of the Notes
or that does not adversely affect the legal rights under the Indenture of any
such Holder, or to comply with the requirements of the SEC in order to effect or
maintain the qualification of the Indenture under the Trust Indenture Act to
provide for the Issuance of Additional Notes in accordance with the limitations
set forth in the Indenture, or to allow any Subsidiary Guarantor to execute a
supplemental indenture to the Indenture and/or a Subsidiary Guarantee with
respect to the Notes.

      12.  Defaults and Remedies.  Events of Default include: (i) default for 30
days in the payment when due of interest on, or Liquidated Damages with respect
to, the Notes (whether or not permitted by the subordination provisions of the
Indenture); (ii) default in payment when due of the principal of or premium, if
any, on the Notes (whether or not permitted by the subordination provisions of
the Indenture); (iii) failure by the Company or any of its Restricted
Subsidiaries to comply with Section 4.15 of the Indenture; (iv) failure by the
Company or any of its Restricted Subsidiaries for 60 days after notice by the
Trustee or by the Holders of at least 25% in principal amount of Notes then
outstanding to comply with any of its other agreements in the Indenture or the
Notes; (v) default under any mortgage, indenture or instrument under which there
may be issued or by which there may be secured or evidenced any Indebtedness for
money borrowed by the Company or any of its Restricted Subsidiaries (or the
payment of which is guaranteed by the Company or any of its Restricted
Subsidiaries) whether such Indebtedness or guarantee now exists, or is created
after the date of the Indenture, which default (a) is caused by a failure to pay
principal of or premium, if any, or interest on 

                                     A2-6

 
such Indebtedness prior to the expiration of the grace period provided in such
Indebtedness on the date of such default (a "Payment Default") or (b) results in
the acceleration of such Indebtedness prior to its stated maturity and, in each
case, the principal amount of any such Indebtedness, together with the principal
amount of any other such Indebtedness under which there has been a Payment
Default or the maturity of which has been so accelerated (after giving effect to
any applicable grace period), aggregates $10.0 million or more; (vi) failure by
the Company or any of its Restricted Subsidiaries to pay final judgments
aggregating in excess of $10.0 million (net of any amount with respect to which
a reputable insurance company with assets over $100.0 million has acknowledged
liability in writing), which judgments are not paid, discharged or stayed for a
period of 60 days after their entry; (vii) certain events of bankruptcy or
insolvency with respect to the Company or any of its Subsidiaries and (viii)
except as permitted by the Indenture, any Subsidiary Guarantee shall be held in
any judicial proceeding to be unenforceable or invalid or shall cease for any
reason to be in full force and effect or any Subsidiary Guarantor, or any Person
acting on behalf of any Subsidiary Guarantor, shall deny or disaffirm its
obligations under its Subsidiary Guarantee. If any Event of Default occurs and
is continuing, the Trustee or the Holders of at least 25% in principal amount of
the then outstanding Notes may declare all the Notes to be due and payable.
Notwithstanding the foregoing, in the case of an Event of Default arising from
certain events of bankruptcy or insolvency, all outstanding Notes will become
due and payable without further action or notice. Holders may not enforce the
Indenture or the Notes except as provided in the Indenture. Subject to certain
limitations, Holders of a majority in principal amount of the then outstanding
Notes may direct the Trustee in its exercise of any trust or power. The Trustee
may withhold from Holders of the Notes notice of any continuing Default or Event
of Default (except a Default or Event of Default relating to the payment of
principal or interest) if it determines that withholding notice is in their
interest. The Holders of a majority in aggregate principal amount of the Notes
then outstanding by notice to the Trustee may on behalf of the Holders of all of
the Notes waive any existing Default or Event of Default and its consequences
under the Indenture except a continuing Default or Event of Default in the
payment of interest on, or the principal of, the Notes. The Company is required
to deliver to the Trustee annually a statement regarding compliance with the
Indenture, and the Company is required upon becoming aware of any Default or
Event of Default, to deliver to the Trustee a statement specifying such Default
or Event of Default.

      13.  Trustee Dealings with Company.  The Trustee, in its individual or any
other capacity, may make loans to, accept deposits from, and perform services
for the Company or its Affiliates, and may otherwise deal with the Company or
its Affiliates, as if it were not the Trustee.

      14.  No Recourse Against Others.  A director, officer, employee,
incorporator or stockholder, of the Company or any of the Subsidiary Guarantors,
as such, shall not have any liability for any obligations of the Company or such
Subsidiary Guarantor under the Notes, the Subsidiary Guarantees or the Indenture
or for any claim based on, in respect of, or by reason of, such obligations or
their creation.  Each Holder by accepting a Note waives and releases all such
liability.  The waiver and release are part of the consideration for the
issuance of the Notes.

      15.  Authentication.  This Note shall not be valid until authenticated by
the manual signature of the Trustee or an authenticating agent.

                                     A2-7

 
      16.  Abbreviations.  Customary abbreviations may be used in the name of a
Holder or an assignee, such as:  TEN COM (= tenants in common), TEN ENT (=
tenants by the entireties), JT TEN (= joint tenants with right of survivorship
and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts
to Minors Act).

      17.  Additional Rights of Holders of Restricted Global Notes and
Restricted Definitive Notes. In addition to the rights provided to Holders of
Notes under the Indenture, Holders of Restricted Global Notes and Restricted
Definitive Notes shall have all the rights set forth in the A/B Exchange
Registration Rights Agreement dated as of August 19, 1998, among the Company and
the parties named on the signature pages thereof or, in the case of Additional
Notes, Holders of Restricted Global Notes and Restricted Definitive Notes shall
have the rights set forth in one or more registration rights agreements, if any,
between the Company and the other parties thereto, relating to rights given by
the Company to the purchasers of any Additional Notes (collectively, the
"Registration Rights Agreement").

      18.  CUSIP Numbers.  Pursuant to a recommendation promulgated by the
Committee on Uniform Security Identification Procedures, the Company has caused
CUSIP numbers to be printed on the Notes and the Trustee may use CUSIP numbers
in notices of redemption as a convenience to Holders.  No representation is made
as to the accuracy of such numbers either as printed on the Notes or as
contained in any notice of redemption and reliance may be placed only on the
other identification numbers placed thereon.

      The Company will furnish to any Holder upon written request and without
charge a copy of the Indenture and/or the Registration Rights Agreement.
Requests may be made to:

Great Lakes Dredge & Dock Corporation
2122 York Road
Oak Brook, Illinois  60521
Attention:  President

                                     A2-8

 
                                Assignment Form

      To assign this Note, fill in the form below:

(I) or (we) assign and transfer this Note to:___________________________________

                                              (Insert assignee's legal name)

________________________________________________________________________________

                (Insert assignee's soc. sec. or tax I.D. no.)

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________

             (Print or type assignee's name, address and zip code)

and irrevocably appoint_________________________________________________________

to transfer this Note on the books of the Company.  The agent may substitute
another to act for him.

Date:_______________

                              Your Signature:___________________________________

                    (Sign exactly as your name appears on the face of this Note)

Signature Guarantee*:_____________________________________


*  Participant in a recognized Signature Guarantee Medallion Program (or other
signature guarantor acceptable to the Trustee).

                                     A2-9

 
                      Option of Holder to Elect Purchase

      If you want to elect to have this Note purchased by the Company pursuant
to Section 4.10 or 4.15 of the Indenture, check the appropriate box below:

              [_] Section 4.10      [_] Section 4.15

      If you want to elect to have only part of the Note purchased by the
Company pursuant to Section 4.10 or Section 4.15 of the Indenture, state the
amount you elect to have purchased:

                         $______________________

Date:____________________

                              Your Signature:______________________________

                    (Sign exactly as your name appears on the face of this Note)

                              Tax Identification No.:______________________

Signature Guarantee*:______________________________


*  Participant in a recognized Signature Guarantee Medallion Program (or other
signature guarantor acceptable to the Trustee).

                                     A2-10

 
          SCHEDULE OF EXCHANGES OF REGULATION S TEMPORARY GLOBAL NOTE

      The following exchanges of a part of this Regulation S Temporary Global
Note for an interest in another Global Note, or of other Restricted Global Notes
for an interest in this Regulation S Temporary Global Note, have been made:




                                                                                          
                                                                    Principal Amount         Signature of     
                    Amount of decrease in  Amount of increase in   of this Global Note   authorized officer of             
                     Principal Amount of     Principal Amount    following such decrease   Trustee or Note
Date of Exchange       this Global Note    of this Global Note       (or increase)            Custodian
- ----------------    ---------------------  --------------------  ----------------------  -------------------
                                                                              


                                     A2-11

 
                                                                       EXHIBIT B

                        FORM OF CERTIFICATE OF TRANSFER

Great Lakes Dredge & Dock Corporation
2122 York Road
Oak Brook, Illinois  60521

The Bank of New York
101 Barclay Street, Floor 21 West
New York, New York  10286

      Re: 11 1/4% Senior Subordinated Notes due 2008
          ------------------------------------------

      Reference is hereby made to the Indenture, dated as of August 19, 1998
(the "Indenture"), between Great Lakes Dredge & Dock Corporation, as issuer (the
"Company"), and The Bank of New York, as trustee.  Capitalized terms used but
not defined herein shall have the meanings given to them in the Indenture.

      ___________________, (the "Transferor") owns and proposes to transfer the
Note[s] or interest in such Note[s] specified in Annex A hereto, in the
principal amount of $___________ in such Note[s] or interests (the "Transfer"),
to ___________________________ (the "Transferee"), as further specified in
Annex A hereto.  In connection with the Transfer, the Transferor hereby
certifies that:

                            [CHECK ALL THAT APPLY]

      1. [_] CHECK IF TRANSFEREE WILL TAKE DELIVERY OF A BENEFICIAL INTEREST IN
             ------------------------------------------------------------------
THE 144A GLOBAL NOTE OR A DEFINITIVE NOTE PURSUANT TO RULE 144A.  The Transfer
- ---------------------------------------------------------------               
is being effected pursuant to and in accordance with Rule 144A under the United
States Securities Act of 1933, as amended (the "Securities Act"), and,
accordingly, the Transferor hereby further certifies that the beneficial
interest or Definitive Note is being transferred to a Person that the Transferor
reasonably believed and believes is purchasing the beneficial interest or
Definitive Note for its own account, or for one or more accounts with respect to
which such Person exercises sole investment discretion, and such Person and each
such account is a "qualified institutional buyer" within the meaning of Rule
144A in a transaction meeting the requirements of Rule 144A and such Transfer is
in compliance with any applicable blue sky securities laws of any state of the
United States.  Upon consummation of the proposed Transfer in accordance with
the terms of the Indenture, the transferred beneficial interest or Definitive
Note will be subject to the restrictions on transfer enumerated in the Private
Placement Legend printed on the 144A Global Note and/or the Definitive Note and
in the Indenture and the Securities Act.

      2. [_] CHECK IF TRANSFEREE WILL TAKE DELIVERY OF A BENEFICIAL INTEREST IN
             ------------------------------------------------------------------
THE TEMPORARY REGULATION S GLOBAL NOTE, THE REGULATION S GLOBAL NOTE OR A
- -------------------------------------------------------------------------
DEFINITIVE NOTE PURSUANT TO REGULATION S.  The Transfer is being effected
- ----------------------------------------                                 
pursuant to and in accordance with Rule 903 or Rule 904 under the Securities Act
and, accordingly, the Transferor hereby further certifies that (i) the Transfer
is not being made to a person in the United States and (x) at the time the buy
order was originated, the Transferee was outside the United States or such
Transferor and any Person acting on its behalf reasonably believed and believes
that the Transferee was outside the United States or (y) the transaction 

                                      B-1

 
was executed in, on or through the facilities of a designated offshore
securities market and neither such Transferor nor any Person acting on its
behalf knows that the transaction was prearranged with a buyer in the United
States, (ii) no directed selling efforts have been made in contravention of the
requirements of Rule 903(b) or Rule 904(b) of Regulation S under the Securities
Act [and/,] (iii) the transaction is not part of a plan or scheme to evade the
registration requirements of the Securities Act and (iv) if the proposed
transfer is being made prior to the expiration of the Restricted Period, the
transfer is not being made to a U.S. Person or for the account or benefit of a
U.S. Person (other than an Initial Purchaser). Upon consummation of the proposed
transfer in accordance with the terms of the Indenture, the transferred
beneficial interest or Definitive Note will be subject to the restrictions on
Transfer enumerated in the Private Placement Legend printed on the Regulation S
Global Note , the Temporary Regulation S Global Note and/or the Definitive Note
and in the Indenture and the Securities Act.

      3. [_] CHECK AND COMPLETE IF TRANSFEREE WILL TAKE DELIVERY OF A BENEFICIAL
             -------------------------------------------------------------------
INTEREST IN THE IAI GLOBAL NOTE OR A DEFINITIVE NOTE PURSUANT TO ANY PROVISION
- ------------------------------------------------------------------------------
OF THE SECURITIES ACT OTHER THAN RULE 144A OR REGULATION S.  The Transfer is
- ----------------------------------------------------------                  
being effected in compliance with the transfer restrictions applicable to
beneficial interests in Restricted Global Notes and Restricted Definitive Notes
and pursuant to and in accordance with the Securities Act and any applicable
blue sky securities laws of any state of the United States, and accordingly the
Transferor hereby further certifies that (check one):

         (a) [_] such Transfer is being effected pursuant to and in accordance
   with Rule 144 under the Securities Act;

                                      or

         (b) [_] such Transfer is being effected to the Company or a subsidiary
   thereof;

                                      or

         (c) [_] such Transfer is being effected pursuant to an effective
   registration statement under the Securities Act and in compliance with the
   prospectus delivery requirements of the Securities Act;

                                      or

         (d) [_] such Transfer is being effected to an Institutional Accredited
   Investor and pursuant to an exemption from the registration requirements of
   the Securities Act other than Rule 144A, Rule 144 or Rule 904, and the
   Transferor hereby further certifies that it has not engaged in any general
   solicitation within the meaning of Regulation D under the Securities Act and
   the Transfer complies with the transfer restrictions applicable to beneficial
   interests in a Restricted Global Note or Restricted Definitive Notes and the
   requirements of the exemption claimed, which certification is supported by
   (1) a certificate executed by the Transferee in the form of Exhibit D to the
   Indenture and (2) if such Transfer is in respect of a principal amount of
   Notes at the time of transfer of less than $250,000, an Opinion of Counsel
   provided by the Transferor or the Transferee (a copy of which the Transferor
   has attached to this certification), to the effect that such Transfer is in
   compliance with the Securities Act.  Upon consummation of the proposed
   transfer in accordance with the terms of the Indenture, the transferred
   beneficial interest or Definitive Note will be subject 

                                      B-2

 
   to the restrictions on transfer enumerated in the Private Placement Legend
   printed on the IAI Global Note and/or the Definitive Notes and in the
   Indenture and the Securities Act.

      4. [_] CHECK IF TRANSFEREE WILL TAKE DELIVERY OF A BENEFICIAL INTEREST IN
             ------------------------------------------------------------------
AN UNRESTRICTED GLOBAL NOTE OR OF AN UNRESTRICTED DEFINITIVE NOTE.
- ----------------------------------------------------------------- 

      (a) [_] CHECK IF TRANSFER IS PURSUANT TO RULE 144.  (i) The Transfer is
being effected pursuant to and in accordance with Rule 144 under the Securities
Act and in compliance with the transfer restrictions contained in the Indenture
and any applicable blue sky securities laws of any state of the United States
and (ii) the restrictions on transfer contained in the Indenture and the Private
Placement Legend are not required in order to maintain compliance with the
Securities Act.  Upon consummation of the proposed Transfer in accordance with
the terms of the Indenture, the transferred beneficial interest or Definitive
Note will no longer be subject to the restrictions on transfer enumerated in the
Private Placement Legend printed on the Restricted Global Notes, on Restricted
Definitive Notes and in the Indenture.

      (b) [_] CHECK IF TRANSFER IS PURSUANT TO REGULATION S.  (i) The Transfer
is being effected pursuant to and in accordance with Rule 903 or Rule 904 under
the Securities Act and in compliance with the transfer restrictions contained in
the Indenture and any applicable blue sky securities laws of any state of the
United States and (ii) the restrictions on transfer contained in the Indenture
and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act.  Upon consummation of the proposed Transfer
in accordance with the terms of the Indenture, the transferred beneficial
interest or Definitive Note will no longer be subject to the restrictions on
transfer enumerated in the Private Placement Legend printed on the Restricted
Global Notes, on Restricted Definitive Notes and in the Indenture.

      (c) [_] CHECK IF TRANSFER IS PURSUANT TO OTHER EXEMPTION.  (i) The
Transfer is being effected pursuant to and in compliance with an exemption from
the registration requirements of the Securities Act other than Rule 144, Rule
903 or Rule 904 and in compliance with the transfer restrictions contained in
the Indenture and any applicable blue sky securities laws of any State of the
United States and (ii) the restrictions on transfer contained in the Indenture
and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act.  Upon consummation of the proposed Transfer
in accordance with the terms of the Indenture, the transferred beneficial
interest or Definitive Note will not be subject to the restrictions on transfer
enumerated in the Private Placement Legend printed on the Restricted Global
Notes or Restricted Definitive Notes and in the Indenture.

      This certificate and the statements contained herein are made for your
benefit and the benefit of the Company.

                              _____________________________________________

                                         [Insert Name of Transferor]

                              By:__________________________________________
                               Name:

                                      B-3

 
                               Title:
Dated:_________________

                                      B-4

 
                      ANNEX A TO CERTIFICATE OF TRANSFER


   1. The Transferor owns and proposes to transfer the following:

                           [CHECK ONE OF (a) OR (b)]

        (a) [_]   a beneficial interest in the:
            (i)   [_] 144A Global Note (CUSIP ___________), or
            (ii)  [_] Regulation S Global Note (CUSIP ________), or
            (iii) [_] IAI Global Note (CUSIP __________); or
        (b) [_]   a Restricted Definitive Note.

   2. After the Transfer the Transferee will hold:

                                  [CHECK ONE]

        (a) [_]   a beneficial interest in the:

            (i)   [_] 144A Global Note (CUSIP __________), or
            (ii)  [_] Regulation S Global Note (CUSIP ________), or
            (iii) [_] IAI Global Note (CUSIP ____________); or
            (iv)  [_] Unrestricted Global Note (CUSIP   ); or
        (b) [_]   a Restricted Definitive Note; or
        (c) [_]   an Unrestricted Definitive Note,
        in accordance with the terms of the Indenture.

                                      B-5

 
                                                                       EXHIBIT C

                        FORM OF CERTIFICATE OF EXCHANGE

Great Lakes Dredge & Dock Corporation
2122 York Road
Oak Brook, Illinois  60521

The Bank of New York
101 Barclay Street, Floor 21 West
New York, New York  10286

      Re: 11 1/4% Senior Subordinated Notes due 2008
          ------------------------------------------

                              (CUSIP ____________)

      Reference is hereby made to the Indenture, dated as of August 19, 1998
(the "Indenture"), between Great Lakes Dredge & Dock Corporation, as issuer (the
"Company"), and The Bank of New York, as trustee.  Capitalized terms used but
not defined herein shall have the meanings given to them in the Indenture.

      __________________________, (the "Owner") owns and proposes to exchange
the Note[s] or interest in such Note[s] specified herein, in the principal
amount of $____________ in such Note[s] or interests (the "Exchange").  In
connection with the Exchange, the Owner hereby certifies that:

      1.  EXCHANGE OF RESTRICTED DEFINITIVE NOTES OR BENEFICIAL INTERESTS IN A
          --------------------------------------------------------------------
RESTRICTED GLOBAL NOTE FOR UNRESTRICTED DEFINITIVE NOTES OR BENEFICIAL INTERESTS
- --------------------------------------------------------------------------------
IN AN UNRESTRICTED GLOBAL NOTE
- ------------------------------

      (a) [_] CHECK IF EXCHANGE IS FROM BENEFICIAL INTEREST IN A RESTRICTED
GLOBAL NOTE TO BENEFICIAL INTEREST IN AN UNRESTRICTED GLOBAL NOTE.  In
connection with the Exchange of the Owner's beneficial interest in a Restricted
Global Note for a beneficial interest in an Unrestricted Global Note in an equal
principal amount, the Owner hereby certifies (i) the beneficial interest is
being acquired for the Owner's own account without transfer, (ii) such Exchange
has been effected in compliance with the transfer restrictions applicable to the
Global Notes and pursuant to and in accordance with the United States Securities
Act of 1933, as amended (the "Securities Act"), (iii) the restrictions on
transfer contained in the Indenture and the Private Placement Legend are not
required in order to maintain compliance with the Securities Act and (iv) the
beneficial interest in an Unrestricted Global Note is being acquired in
compliance with any applicable blue sky securities laws of any state of the
United States.

      (b) [_] CHECK IF EXCHANGE IS FROM BENEFICIAL INTEREST IN A RESTRICTED
GLOBAL NOTE TO UNRESTRICTED DEFINITIVE NOTE.  In connection with the Exchange of
the Owner's beneficial interest in a Restricted Global Note for an Unrestricted
Definitive Note, the Owner hereby certifies (i) the Definitive Note is being
acquired for the Owner's own account without transfer, (ii) such Exchange has
been effected in compliance with the transfer restrictions applicable to the
Restricted Global Notes and pursuant to and in accordance with the Securities
Act, (iii) the restrictions on transfer contained in the 

                                      C-1

 
Indenture and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act and (iv) the Definitive Note is being
acquired in compliance with any applicable blue sky securities laws of any state
of the United States.

      (c) [_] CHECK IF EXCHANGE IS FROM RESTRICTED DEFINITIVE NOTE TO BENEFICIAL
INTEREST IN AN UNRESTRICTED GLOBAL NOTE.  In connection with the Owner's
Exchange of a Restricted Definitive Note for a beneficial interest in an
Unrestricted Global Note, the Owner hereby certifies (i) the beneficial interest
is being acquired for the Owner's own account without transfer, (ii) such
Exchange has been effected in compliance with the transfer restrictions
applicable to Restricted Definitive Notes and pursuant to and in accordance with
the Securities Act, (iii) the restrictions on transfer contained in the
Indenture and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act and (iv) the beneficial interest is being
acquired in compliance with any applicable blue sky securities laws of any state
of the United States.

      (d) [_] CHECK IF EXCHANGE IS FROM RESTRICTED DEFINITIVE NOTE TO
UNRESTRICTED DEFINITIVE NOTE.  In connection with the Owner's Exchange of a
Restricted Definitive Note for an Unrestricted Definitive Note, the Owner hereby
certifies (i) the Unrestricted Definitive Note is being acquired for the Owner's
own account without transfer, (ii) such Exchange has been effected in compliance
with the transfer restrictions applicable to Restricted Definitive Notes and
pursuant to and in accordance with the Securities Act, (iii) the restrictions on
transfer contained in the Indenture and the Private Placement Legend are not
required in order to maintain compliance with the Securities Act and (iv) the
Unrestricted Definitive Note is being acquired in compliance with any applicable
blue sky securities laws of any state of the United States.

      2.  EXCHANGE OF RESTRICTED DEFINITIVE NOTES OR BENEFICIAL INTERESTS IN
          ------------------------------------------------------------------
RESTRICTED GLOBAL NOTES FOR RESTRICTED DEFINITIVE NOTES OR BENEFICIAL INTERESTS
- -------------------------------------------------------------------------------
IN RESTRICTED GLOBAL NOTES
- --------------------------

      (a) [_] CHECK IF EXCHANGE IS FROM BENEFICIAL INTEREST IN A RESTRICTED
GLOBAL NOTE TO RESTRICTED DEFINITIVE NOTE.  In connection with the Exchange of
the Owner's beneficial interest in a Restricted Global Note for a Restricted
Definitive Note with an equal principal amount, the Owner hereby certifies that
the Restricted Definitive Note is being acquired for the Owner's own account
without transfer.  Upon consummation of the proposed Exchange in accordance with
the terms of the Indenture, the Restricted Definitive Note issued will continue
to be subject to the restrictions on transfer enumerated in the Private
Placement Legend printed on the Restricted Definitive Note and in the Indenture
and the Securities Act.

      (b) CHECK IF EXCHANGE IS FROM RESTRICTED DEFINITIVE NOTE TO BENEFICIAL
INTEREST IN A RESTRICTED GLOBAL NOTE.  In connection with the Exchange of the
Owner's Restricted Definitive Note for a beneficial interest in the [CHECK ONE]
[_] 144A Global Note, [_] Regulation S Global Note, [_] IAI Global Note with 
an equal principal amount, the Owner hereby certifies (i) the beneficial
interest is being acquired for the Owner's own account without transfer and (ii)
such Exchange has been effected in compliance with the transfer restrictions
applicable to the Restricted Global Notes and pursuant to and in accordance with
the Securities Act, and in compliance with any applicable blue sky securities
laws of any state of the United States. Upon consummation of the proposed
Exchange in accordance with the terms of the Indenture, the beneficial interest
issued will be subject to the restrictions on transfer 

                                      C-2

 
enumerated in the Private Placement Legend printed on the relevant Restricted
Global Note and in the Indenture and the Securities Act.

                                      C-3

                                                                       EXHIBIT C

 
      This certificate and the statements contained herein are made for your
benefit and the benefit of the Company.

 
                              _____________________________________________
                                   [Insert Name of Transferor]

                              By:__________________________________________
                               Name:
                               Title:
Dated:____________________

                                      C-4

 
                                                                       EXHIBIT D

                           FORM OF CERTIFICATE FROM

                  ACQUIRING INSTITUTIONAL ACCREDITED INVESTOR

Great Lakes Dredge & Dock Corporation
2122 York Road
Oak Brook, Illinois  60521

The Bank of New York
101 Barclay Street, Floor 21 West
New York, New York  10286

          Re:  11 1/4% Senior Subordinated Notes due 2008
               ------------------------------------------

          Reference is hereby made to the Indenture, dated as of August 19, 1998
(the "Indenture"), between Great Lakes Dredge & Dock Corporation, as issuer (the
"Company"), and The Bank of New York, as trustee. Capitalized terms used but not
defined herein shall have the meanings given to them in the Indenture.

          In connection with our proposed purchase of $____________ aggregate
principal amount of:

          (a)  [_]  a beneficial interest in a Global Note, or

          (b)  [_]  a Definitive Note,

          we confirm that:

          1.   We understand that any subsequent transfer of the Notes or any
interest therein is subject to certain restrictions and conditions set forth in
the Indenture and the undersigned agrees to be bound by, and not to resell,
pledge or otherwise transfer the Notes or any interest therein except in
compliance with, such restrictions and conditions and the United States
Securities Act of 1933, as amended (the "Securities Act").

          2.   We understand that the offer and sale of the Notes have not been
registered under the Securities Act, and that the Notes and any interest therein
may not be offered or sold except as permitted in the following sentence. We
agree, on our own behalf and on behalf of any accounts for which we are acting
as hereinafter stated, that if we should sell the Notes or any interest therein,
we will do so only (A) to the Company or any subsidiary thereof, (B) in
accordance with Rule 144A under the Securities Act to a "qualified institutional
buyer" (as defined therein), (C) to an institutional "accredited investor" (as
defined below) that, prior to such transfer, furnishes (or has furnished on its
behalf by a U.S. broker-dealer) to you and to the Company a signed letter
substantially in the form of this letter and, if such transfer is in respect of
a principal amount of Notes, at the time of transfer of less than $250,000, an
Opinion of Counsel in form reasonably acceptable to the Company to the effect
that such transfer is in compliance with the Securities Act, (D) outside the
United States in accordance with Rule 904 of

                                      D-1

 
                                                                       EXHIBIT D

Regulation S under the Securities Act, (E) pursuant to the provisions of Rule
144(k) under the Securities Act or (F) pursuant to an effective registration
statement under the Securities Act, and we further agree to provide to any
person purchasing the Definitive Note or beneficial interest in a Global Note
from us in a transaction meeting the requirements of clauses (A) through (E) of
this paragraph a notice advising such purchaser that resales thereof are
restricted as stated herein.

          3.   We understand that, on any proposed resale of the Notes or
beneficial interest therein, we will be required to furnish to you and the
Company such certifications, legal opinions and other information as you and the
Company may reasonably require to confirm that the proposed sale complies with
the foregoing restrictions. We further understand that the Notes purchased by us
will bear a legend to the foregoing effect.

          4.   We are an institutional "accredited investor" (as defined in Rule
501(a)(1), (2), (3) or (7) of Regulation D under the Securities Act) and have
such knowledge and experience in financial and business matters as to be capable
of evaluating the merits and risks of our investment in the Notes, and we and
any accounts for which we are acting are each able to bear the economic risk of
our or its investment.

          5.   We are acquiring the Notes or beneficial interest therein
purchased by us for our own account or for one or more accounts (each of which
is an institutional "accredited investor") as to each of which we exercise sole
investment discretion.

          You and the Company are entitled to rely upon this letter and are
irrevocably authorized to produce this letter or a copy hereof to any interested
party in any administrative or legal proceedings or official inquiry with
respect to the matters covered hereby.

 
                                        ________________________________________
                                          [Insert Name of Accredited Investor]

                                        By:_____________________________________
                                         Name:
                                         Title:

Dated:____________________

                                      D-2

 
                                                                       EXHIBIT E

                        [FORM OF NOTATION OF GUARANTEE]

          For value received, each Subsidiary Guarantor (which term includes any
successor Person under the Indenture) has, jointly and severally,
unconditionally guaranteed, to the extent set forth in the Indenture and subject
to the provisions in the Indenture dated as of August 19, 1998 (the "Indenture")
among Great Lakes Dredge & Dock Corporation, the Subsidiary Guarantors listed on
Schedule I thereto and The Bank of New York, as trustee (the "Trustee"), (a) the
due and punctual payment of the principal of, premium, if any, and interest on
the Notes (as defined in the Indenture), whether at maturity, by acceleration,
redemption or otherwise, the due and punctual payment of interest on overdue
principal and premium, and, to the extent permitted by law, interest, and the
due and punctual performance of all other obligations of the Company to the
Holders or the Trustee all in accordance with the terms of the Indenture and (b)
in case of any extension of time of payment or renewal of any Notes or any of
such other obligations, that the same will be promptly paid in full when due or
performed in accordance with the terms of the extension or renewal, whether at
stated maturity, by acceleration or otherwise. The obligations of the Subsidiary
Guarantors to the Holders of Notes and to the Trustee pursuant to the Subsidiary
Guarantee and the Indenture are expressly set forth in Article 11 of the
Indenture and reference is hereby made to the Indenture for the precise terms of
the Subsidiary Guarantee. Each Holder of a Note, by accepting the same, (a)
agrees to and shall be bound by such provisions, (b) authorizes and directs the
Trustee, on behalf of such Holder, to take such action as may be necessary or
appropriate to effectuate the subordination as provided in the Indenture and (c)
appoints the Trustee attorney-in-fact of such Holder for such purpose; provided,
however, that the Indebtedness evidenced by this Subsidiary Guarantee shall
cease to be so subordinated and subject in right of payment upon any defeasance
of this Note in accordance with the provisions of the Indenture.


                                 [Name of Subsidiary Guarantor(s)]


                                 By:____________________________________________
                                 Name:
                                 Title:

                                      E-1

 
                                                                       EXHIBIT F

                        [FORM OF SUPPLEMENTAL INDENTURE

             TO BE DELIVERED BY SUBSEQUENT SUBSIDIARY GUARANTORS]

          SUPPLEMENTAL INDENTURE (this "Supplemental Indenture"), dated as of
________________, among __________________ (the "Guaranteeing Subsidiary"), a
subsidiary of Great Lakes Dredge & Dock Corporation (or its permitted
successor), a Delaware corporation (the "Company"), the Company, the other
Subsidiary Guarantors (as defined in the Indenture referred to herein) and The
Bank of New York, as trustee under the indenture referred to below (the
"Trustee").

                              W I T N E S S E T H

          WHEREAS, the Company has heretofore executed and delivered to the
Trustee an indenture (the "Indenture"), dated as of August 19, 1998 providing
for the issuance of an aggregate principal amount of up to $165,000,000 of 11
1/4% Senior Subordinated Notes due 2008 (the "Notes");

          WHEREAS, the Indenture provides that under certain circumstances the
Guaranteeing Subsidiary shall execute and deliver to the Trustee a supplemental
indenture pursuant to which the Guaranteeing Subsidiary shall unconditionally
guarantee all of the Company's Obligations under the Notes and the Indenture on
the terms and conditions set forth herein (the "Subsidiary Guarantee"); and

          WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee is
authorized to execute and deliver this Supplemental Indenture.

          NOW THEREFORE, in consideration of the foregoing and for other good
and valuable consideration, the receipt of which is hereby acknowledged, the
Guaranteeing Subsidiary and the Trustee mutually covenant and agree for the
equal and ratable benefit of the Holders of the Notes as follows:

          1.   CAPITALIZED TERMS.  Capitalized terms used herein without
definition shall have the meanings assigned to them in the Indenture.

          2.   AGREEMENT TO GUARANTEE.  The Guaranteeing Subsidiary hereby
     agrees as follows:

               (a)  Along with all Subsidiary Guarantors named in the Indenture,
     to jointly and severally Guarantee to each Holder of a Note authenticated
     and delivered by the Trustee and to the Trustee and its successors and
     assigns, the Notes or the obligations of the Company hereunder or
     thereunder, that:

                    (i)  the principal of and interest on the Notes will be
          promptly paid in full when due, whether at maturity, by acceleration,
          redemption or otherwise, and interest on the overdue principal of and
          interest on the Notes, if any, if lawful, and all other obligations of
          the Company to the Holders or the Trustee hereunder or thereunder will
          be promptly paid in full or performed, all in accordance with the
          terms hereof and thereof; and

                    (ii) in case of any extension of time of payment or renewal
          of any Notes or any of such other obligations, that same will be
          promptly paid in full when due or performed in

                                      F-1

 
          accordance with the terms of the extension or renewal, whether at
          stated maturity, by acceleration or otherwise. Failing payment when
          due of any amount so guaranteed or any performance so guaranteed for
          whatever reason, the Subsidiary Guarantors shall be jointly and
          severally obligated to pay the same immediately.

               (b)  The obligations hereunder shall be unconditional,
     irrespective of the validity, regularity or enforceability of the Notes or
     the Indenture, the absence of any action to enforce the same, any waiver or
     consent by any Holder of the Notes with respect to any provisions hereof or
     thereof, the recovery of any judgment against the Company, any action to
     enforce the same or any other circumstance which might otherwise constitute
     a legal or equitable discharge or defense of a guarantor.

               (c)  The following is hereby waived: diligence, presentment,
     demand of payment, filing of claims with a court in the event of insolvency
     or bankruptcy of the Company, any right to require a proceeding first
     against the Company, protest, notice and all demands whatsoever.

               (d)  This Subsidiary Guarantee shall not be discharged except by
     complete performance of the obligations contained in the Notes and the
     Indenture, and the Guaranteeing Subsidiary accepts all obligations of a
     Subsidiary Guarantor under the Indenture.

               (e)  If any Holder or the Trustee is required by any court or
     otherwise to return to the Company, the Subsidiary Guarantors, or any
     Custodian, Trustee, liquidator or other similar official acting in relation
     to either the Company or the Subsidiary Guarantors, any amount paid by
     either to the Trustee or such Holder, this Subsidiary Guarantee, to the
     extent theretofore discharged, shall be reinstated in full force and
     effect.

               (f)  The Guaranteeing Subsidiary shall not be entitled to any
     right of subrogation in relation to the Holders in respect of any
     obligations guaranteed hereby until payment in full of all obligations
     guaranteed hereby.

               (g)  As between the Subsidiary Guarantors, on the one hand, and
     the Holders and the Trustee, on the other hand, (x) the maturity of the
     obligations guaranteed hereby may be accelerated as provided in Article 6
     of the Indenture for the purposes of this Subsidiary Guarantee,
     notwithstanding any stay, injunction or other prohibition preventing such
     acceleration in respect of the obligations guaranteed hereby, and (y) in
     the event of any declaration of acceleration of such obligations as
     provided in Article 6 of the Indenture, such obligations (whether or not
     due and payable) shall forthwith become due and payable by the Subsidiary
     Guarantors for the purpose of this Subsidiary Guarantee.

               (h)  The Subsidiary Guarantors shall have the right to seek
     contribution from any non-paying Subsidiary Guarantor so long as the
     exercise of such right does not impair the rights of the Holders under the
     Guarantee.

               (i)  Pursuant to Section 11.02 of the Indenture, after giving
     effect to any maximum amount and any other contingent and fixed liabilities
     that are relevant under any applicable

                                      F-2

 
     Bankruptcy or fraudulent conveyance laws, and after giving effect to any
     collections from, rights to receive contribution from or payments made by
     or on behalf of any other Subsidiary Guarantor in respect of the
     obligations of such other Subsidiary Guarantor under Article 11 of the
     Indenture, this new Subsidiary Guarantee shall be limited to the maximum
     amount permissible such that the obligations of such Subsidiary Guarantor
     under this Subsidiary Guarantee will not constitute a fraudulent transfer
     or conveyance.

          3.   EXECUTION AND DELIVERY.  Each Guaranteeing Subsidiary agrees that
the Subsidiary Guarantees shall remain in full force and effect notwithstanding
any failure to endorse on each Note a notation of such Subsidiary Guarantee.

          4.   GUARANTEEING SUBSIDIARY MAY CONSOLIDATE, ETC. ON CERTAIN TERMS.

          (a)  The Guaranteeing Subsidiary may not consolidate with or merge
with or into (whether or not such Subsidiary Guarantor is the surviving Person)
another corporation, Person or entity whether or not affiliated with such
Subsidiary Guarantor unless:

               (i)  subject to Sections 11.05 and 11.06 of the Indenture, the
     Person formed by or surviving any such consolidation or merger (if other
     than a Subsidiary Guarantor or the Company) unconditionally assumes all the
     obligations of such Subsidiary Guarantor, pursuant to a supplemental
     indenture in form and substance reasonably satisfactory to the Trustee,
     under the Notes, the Indenture and the Subsidiary Guarantee on the terms
     set forth herein or therein; and

               (ii) immediately after giving effect to such transaction, no
     Default or Event of Default exists.

          (b)  In case of any such consolidation, merger, sale or conveyance and
upon the assumption by the successor corporation, by supplemental indenture,
executed and delivered to the Trustee and satisfactory in form to the Trustee,
of the Subsidiary Guarantee endorsed upon the Notes and the due and punctual
performance of all of the covenants and conditions of the Indenture to be
performed by the Subsidiary Guarantor, such successor corporation shall succeed
to and be substituted for the Subsidiary Guarantor with the same effect as if it
had been named herein as a Subsidiary Guarantor. Such successor corporation
thereupon may cause to be signed any or all of the Subsidiary Guarantees to be
endorsed upon all of the Notes issuable hereunder which theretofore shall not
have been signed by the Company and delivered to the Trustee. All the Subsidiary
Guarantees so issued shall in all respects have the same legal rank and benefit
under the Indenture as the Subsidiary Guarantees theretofore and thereafter
issued in accordance with the terms of the Indenture as though all of such
Subsidiary Guarantees had been issued at the date of the execution hereof.

          (c)  Except as set forth in Articles 4 and 5 and Section 11.05 of
Article 11 of the Indenture, and notwithstanding clauses (a) and (b) above,
nothing contained in the Indenture or in any of the Notes shall prevent any
consolidation or merger of a Subsidiary Guarantor with or into the Company or
another Subsidiary Guarantor, or shall prevent any sale or conveyance of the
property of a Subsidiary Guarantor as an entirety or substantially as an
entirety to the Company or another Subsidiary Guarantor.

                                      F-3

 
          5.   RELEASES.

          (a)  In the event of a sale or other disposition of all of the assets
of any Subsidiary Guarantor, by way of merger, consolidation or otherwise, or a
sale or other disposition of all to the capital stock of any Subsidiary
Guarantor, in each case to a Person that is not (either before or after giving
effect to such transaction) a Restricted Subsidiary of the Company, then such
Subsidiary Guarantor (in the event of a sale or other disposition, by way of
merger, consolidation or otherwise, of all of the capital stock of such
Subsidiary Guarantor) or the corporation acquiring the property (in the event of
a sale or other disposition of all or substantially all of the assets of such
Subsidiary Guarantor) will be released and relieved of any obligations under its
Subsidiary Guarantee; provided that the Net Proceeds of such sale or other
disposition are applied in accordance with the applicable provisions of the
Indenture, including without limitation Section 4.10 of the Indenture. Upon
delivery by the Company to the Trustee of an Officers' Certificate and an
Opinion of Counsel to the effect that such sale or other disposition was made by
the Company in accordance with the provisions of the Indenture, including
without limitation Section 4.10 of the Indenture, the Trustee shall execute any
documents reasonably required in order to evidence the release of any Subsidiary
Guarantor from its obligations under its Subsidiary Guarantee.

          (b)  Any Subsidiary Guarantor not released from its obligations under
its Subsidiary Guarantee shall remain liable for the full amount of principal of
and interest on the Notes and for the other obligations of any Subsidiary
Guarantor under the Indenture as provided in Article 11 of the Indenture.

          6.   NO RECOURSE AGAINST OTHERS.  No past, present or future director,
officer, employee, incorporator, stockholder or agent of the Guaranteeing
Subsidiary, as such, shall have any liability for any obligations of the Company
or any Guaranteeing Subsidiary under the Notes, any Subsidiary Guarantees, the
Indenture or this Supplemental Indenture or for any claim based on, in respect
of, or by reason of, such obligations or their creation. Each Holder of the
Notes by accepting a Note waives and releases all such liability. The waiver and
release are part of the consideration for issuance of the Notes. Such waiver may
not be effective to waive liabilities under the federal securities laws and it
is the view of the SEC that such a waiver is against public policy.

          7.   NEW YORK LAW TO GOVERN.  THE INTERNAL LAW OF THE STATE OF NEW
YORK SHALL GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL INDENTURE BUT
WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT
THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED
THEREBY.

          8.   COUNTERPARTS  The parties may sign any number of copies of this
Supplemental Indenture. Each signed copy shall be an original, but all of them
together represent the same agreement.

          9.   EFFECT OF HEADINGS.  The Section headings herein are for
convenience only and shall not affect the construction hereof.

                                      F-4

 
          10.  THE TRUSTEE.  The Trustee shall not be responsible in any manner
whatsoever for or in respect of the validity or sufficiency of this Supplemental
Indenture or for or in respect of the recitals contained herein, all of which
recitals are made solely by the Guaranteeing Subsidiary and the Company.

                                      F-5

 
          IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed and attested, all as of the date first above
written.

Dated:  _______________, ____

                                   [GUARANTEEING SUBSIDIARY]

                                   By: _______________________________
                                   Name:
                                   Title:

                                   GREAT LAKES DREDGE & DOCK CORPORATION

                                   By: _______________________________
                                   Name:
                                   Title:

                                   [EXISTING SUBSIDIARY GUARANTORS]

                                   By: _______________________________
                                   Name:
                                   Title:

                                   THE BANK OF NEW YORK,
                                   as Trustee

                                   By: _______________________________
                                   Name:
                                   Title:

                                      F-6

 
                                  SCHEDULE I

                       SCHEDULE OF SUBSIDIARY GUARANTORS

          The following schedule lists each Subsidiary Guarantor under the
Indenture as of the date of the Indenture:


Great Lakes International, Inc.
Great Lakes Dredge & Dock Company
Dawson Dredging Company
Gates Construction Corp.
Fifty-Three Dredging Corporation