SECOND AMENDMENT

                          Dated as of February 23, 1995

     THIS SECOND AMENDMENT, dated as of February 23, 1995, amends the Credit
Agreement, dated as of May 24, 1994 (as previously amended, the "Credit
Agreement"), among THE EARTH TECHNOLOGY CORPORATION (USA) (the "Company"),
various financial institutions and BANK OF AMERICA ILLINOIS (formerly
Continental Bank N.A.), as Agent (the "Agent").  Terms defined in the Credit
Agreement as amended by this Second Amendment are, unless otherwise defined
herein or the context otherwise requires, used herein as defined therein.

     WHEREAS, the Company, the Agent and the Banks have entered into the Credit
Agreement which provides for the Banks to make Loans to, and to issue or
participate in Letters of Credit issued for the account of, the Company from
time to time; and

     WHEREAS, the parties hereto desire to amend the Credit Agreement in
certain-respects as hereinafter set forth;

     NOW, THEREFORE, in consideration of the premises and for other good and
valuable consideration (the receipt and sufficiency of which are hereby
acknowledged), the parties hereto agree as follows:

     SECTION 1   AMENDMENTS.  Effective as of the Second Amendment Effective
Date (as defined below), the Credit Agreement is amended in accordance with
SECTIONS 1.1 through 1.15 below.

     1.1  AMENDED DEFINITIONS.  Section 1 is amended by deleting the definitions
of "Collateral Documents", "Computation Period", "Eligible Account Receivable"
and "Interest Coverage Ratio" therein and substituting the following therefor:

          "COLLATERAL DOCUMENTS means the Company Pledge Agreement, the
     Subsidiary Pledge Agreements, the Security Agreement, the Mortgages and any
     other agreement pursuant to which the Company or any Guarantor grants
     collateral to the Agent for the benefit of itself and the Lenders."

          "COMPUTATION PERIOD means any period of four consecutive Fiscal
     Quarters ending on the last day of a Fiscal Quarter, PROVIDED that the
     Computation Periods ending on February 24, 1995 and May 26, 1995 shall
     consist of two and three Fiscal Quarters, respectively."

          "ELIGIBLE ACCOUNT RECEIVABLE means an Account Receivable owing to the
     Company or any Subsidiary (other than an Immaterial Subsidiary) which meets
     all of the following requirements:



          (1)  it is evidenced by an invoice rendered to the Account Debtor with
     respect thereto and is due within thirty (30) days after its invoice date;

          (2)  it is not more than 90 days past due;

          (3)  the Account Debtor thereunder is not the Account Debtor with
     respect to Accounts Receivable which are more than 90 days past due
     representing 25% or more of the unpaid amount of all Accounts Receivable
     from such Account Debtor;

          (4)  it is genuine and in all respects what it purports to be, and is
     evidenced by an invoice which (i) is dated NOT EARLIER than the date of
     performance; and (ii) has payment terms consistent with those historically
     used by the Company and its Subsidiaries in the conduct of their respective
     businesses in the ordinary course;

          (5)  it arises from the Company's or such Subsidiary's environmental
     assessment, site remediation, environmental and hazardous waste management,
     infrastructure, facilities engineering, construction management or
     analytical laboratory services or from contract operations for wastewater
     facilities, in each case in the ordinary course of business, and the
     applicable services have been fully performed and, if applicable,
     acknowledged and/or accepted by the Account Debtor thereunder;

          (6)  it is payable in the United States and in Dollars;

          (7)  it is not subject to any assignment, claim or Lien, other than
     (a) a Lien in favor of the Agent, for the benefit of itself and the
     Lenders, and (b) Liens consented to by the Required Lenders in writing;

          (8)  it is a valid, legally enforceable and unconditional obligation
     of the Account Debtor thereunder, and is not subject to setoff,
     counterclaim, credit or allowance (except (i) any credit or allowance which
     has been deducted in computing the net amount of the applicable invoice as
     shown in the original schedule or Borrowing Base Certificate furnished to
     the Agent identifying or including such Account Receivable and (ii) the
     amount of any Retention);

          (9)  it is not subject to any claim by the Account Debtor thereunder
     denying liability therefor in whole or in  part, and such Person has not
     refused to accept any of the goods or services which are the subject of


                                       -2-



     such Account Receivable or offered or attempted to return any of such
     goods;

          (10) there are no proceedings or actions which are then threatened or
     pending against the Account Debtor thereunder, and there has been no event
     or occurrence relating to such Person, which might result in any material
     adverse change in such Person's financial condition which is reasonable
     likely to result in the nonpayment of such Account Receivable in full when
     due;

          (11) it does not arise out of a contract or order which, by its terms,
     forbids, restricts or makes void or unenforceable the assignment by the
     owner thereof to the Agent, for the benefit of itself and the Lenders, of
     the Account Receivable arising with respect thereto;

          (12) the Account Debtor thereunder is not an Affiliate of the Company
     or any Subsidiary, or a director, officer, employee or agent of the Company
     or any Subsidiary;

          (13) the Account Debtor with respect thereto is located within the
     United States of America;

          (14) the Account Debtor thereunder is not located in Indiana, New
     Jersey or Minnesota; PROVIDED, HOWEVER,  that such restriction shall not
     apply to an Account Receivable if at the time the Account Receivable was
     created and at all times thereafter (a) the Company or the Subsidiary to
     which such Account Receivable is owed, as the case may be, had filed and
     has maintained effective a current Notice of Business Activities Report
     with the appropriate office or agency of the State of Indiana, New Jersey
     or Minnesota, as applicable, or (b) the Company or the Subsidiary to which
     such Account Receivable is owed, as the case may be, was and has continued
     to be exempt from the filing of such Report and has provided the Agent with
     satisfactory evidence thereof;

          (15) it is not an Account Receivable which in any way fails to meet or
     violates any warranty, representation or covenant contained in this
     Agreement or the Security Agreement relating directly or indirectly to the
     Company's or any Subsidiary's Accounts Receivable; and

          (16) it does not arise from any contract with respect to which the
     Company or such Subsidiary maintains bonds, undertakings or instruments of
     guaranty guarantying the performance by the Company or such Subsidiary of
     its obligations under such contract.


                                       -3-



     An Account Receivable which is at any time an Eligible Account Receivable,
     but which subsequently fails to meet any of the foregoing requirements,
     shall forthwith cease to be an Eligible Account Receivable.  Without
     limiting any of the foregoing eligibility requirements, no Retention shall
     be included in Eligible Accounts Receivable (but any Account Receivable
     which at any time constitutes Retention may subsequently be included in
     Eligible Accounts Receivable if (a) all conditions to the Account Debtor's
     obligation to make payment thereof have been met so that it no longer
     constitutes "Retention" and (b) it otherwise meets the eligibility
     requirements set forth above.)  Further, with respect to any Account
     Receivable, if the Agent at any time hereafter determines in its reasonable
     discretion that the prospect of payment or performance by the Account
     Debtor thereunder is or will be impaired for any reason whatsoever,
     notwithstanding anything to the contrary contained above, such Account
     Receivable shall, upon notice to the Company from the Agent, forthwith
     cease to be an Eligible Account Receivable."

          "INTEREST COVERAGE RATIO means, for any period, the ratio of (a)
     Consolidated Net Income for such period before deducting (i) interest
     expense and taxes of the Company and its Subsidiaries (other than the
     Immaterial Subsidiaries) and (ii) the HazWaste Merger Charge (to the extent
     deducted in such period) to (b) the Company's and its Subsidiaries' (other
     than the Immaterial Subsidiaries') consolidated interest expense for such
     period; IT BEING UNDERSTOOD that for purposes of calculating the Interest
     Coverage Ratio, HazWaste shall be deemed to have become a Subsidiary on
     August 27, 1994."

     1.2  NEW DEFINITIONS.  Section 1 Agreement is amended by adding the
following definitions in appropriate alphabetical order:

          "HAZWASTE means HazWaste Industries Incorporated, a Virginia
     corporation."

          "HAZWASTE MERGER means the merger of HazWaste into ET-Sub II, Inc., a
     wholly owned Subsidiary of the Company, pursuant to the Agreement and Plan
     of Merger dated as of October 24, 1994 among the Company, ET-Sub II, Inc.
     and HazWaste."

          "HAZWASTE MERGER CHARGE means the one-time special charge taken by the
     Company in connection with the HazWaste Merger as described in the Proxy
     dated January 19, 1995; PROVIDED that for purposes of this Agreement the
     HazWaste Merger Charge shall not exceed $4,500,000."


                                       -4-



     1.3  SECTION 2.1.3.  Section 2.1.3 is amended by deleting the amount
"$20,000,000" therein and substituting the amount "$25,000,000" therefor.

     1.4  SECTION 9.4.  Section 9.4 is amended in its entirety to read as
follows:

          "9.4 FINANCIAL INFORMATION.  (a)  The Company's audited consolidated
     financial statements as at August 26, 1994, and the Company's unaudited
     consolidated financial statements as at November 25, 1994, have been
     prepared in accordance with generally accepted accounting principles
     (subject, in the case of such unaudited statements, to the absence of
     footnotes and to normal year-end adjustments) and fairly present the
     financial condition of the Company and its Subsidiaries on a consolidated
     basis as of such dates and their consolidated results of operations for the
     Fiscal Year and fiscal period then ended.  The unaudited pro forma
     consolidated financial statements of the Company and its Subsidiaries as at
     August 26, 1994 and November 25, 1994, after giving effect to the HazWaste
     Merger, which are included in the Proxy dated January 19, 1995, copies of
     which have been furnished to the Lenders, have been prepared in accordance
     with generally accepted accounting principles and fairly present the pro
     forma financial condition of the Company and its Subsidiaries as at such
     dates, after giving effect to the HazWaste Merger.

          (b)  HazWaste's unaudited consolidated financial statements as at
     December 2, 1994, copies of which have been furnished to the Lenders, have
     been prepared in accordance with generally accepted accounting principles,
     subject to the absence of footnotes and to normal year-end adjustments, and
     fairly present the financial condition of HazWaste and its Subsidiaries on
     a consolidated basis as of such date and their consolidated results of
     operations for the periods then ended."

     1.5  SECTION 10.1.8.  Section 10.1.8 is amended by delating the language
"and an aging of Accounts Receivable in such detail as the Agent shall require"
at the end thereof and substituting the following language therefor:

          ", together with (a) an aging of Accounts Receivable in such detail as
          the Agent shall require, (b) a 50% Complete Report by Billing-ID and
          an Overrun Report by Billing-ID, in each case substantially in the
          form customarily prepared by the Company as of the date of the First
          Amendment to this Agreement, and (c) a HazWaste Unbilled Rollforward
          Report, substantially in the form customarily prepared by HazWaste as
          of the date of the First Amendment to this Agreement".


                                       -5-


     1.6  SECTION 10.6.1.  Section 10.6.1 is amended in its entirety to read as
follows:

          "10.6.1 MINIMUM TANGIBLE NET WORTH.  Not at any time permit Tangible
     Net Worth to be less than (a) during the Computation Quarter commencing
     February 24, 1995, the greater of Tangible Net worth on February 24, 1995
     and $8,500,000; and (b) during any Computation Quarter commencing on or
     after May 26, 1995, an amount equal to the sum of (i) the minimum Tangible
     Net Worth required under this SECTION 10.6.1 during the immediately prior
     Computation Quarter, PLUS (ii) 50% of Consolidated Net Income during the
     Fiscal Quarter ending on the first day of such current Computation Quarter,
     PLUS (iii) 100% of all proceeds (net of any underwriting discounts and
     brokers' commissions) of any offering or distribution of the Company's
     common stock or any other equity interest in the Company received during
     the Fiscal Quarter ending on the first day of such current Computation
     Quarter."

     1.7  SECTION 10.6.2.  Section 10.6.2 is amended by adding the following
parenthetical clause at the end thereof:  "(it being understood that the
HazWaste Merger Charge shall be excluded in calculating Consolidated Net Income
for the Fiscal Quarter ending February 24, 1995)".

     1.8  SECTION 10.6.4.  Section 10.6.4 is amended in its entirety to read as
follows:

          "10.6.4  LEVERAGE RATIO.  Not permit the ratio of (a) Total Debt to
     (b) the sum of Total Debt PLUS the consolidated stockholders' equity of the
     Company (excluding any portion thereof attributable to Immaterial
     Subsidiaries) during any period set forth below to be greater than the
     percentage set forth opposite such period:

          PERIOD                             MAXIMUM LEVERAGE RATIO

          Effective Date through and
          including May 26, 1995                       65%

          May 27, 1995 through and
          including November 24, 1995                  62%

          November 25, 1995 through and
          including May 24, 1996                       59%

          May 25, 1996 through and
          including November 29, 1996                  56%

          November 30, 1996 through and
          including February 28, 1997                  53%


                                       -6-



\         March 1, 1997 and at all
          times thereafter                             50%."

     1.9  SECTION 10.6.6.  Section 10.6.6 is amended in its entirety to read as
follows:

          "10.6.6  FIXED CHARGE COVERAGE.  Not permit the ratio, for any
     Computation Period commencing with the Computation Period ending February
     24, 1995, of (i) EBITDA PLUS operating lease expense (whether or not paid)
     of the Company and its Subsidiaries (other than the Immaterial
     Subsidiaries) for such Computation Period (plus, to the extent deducted
     in such Computation Period, the HazWaste Merger Charge) to
     (ii) (x) interest expense of the Company and its Subsidiaries (other than
     the Immaterial Subsidiaries) PLUS all payments on Capital Leases and
     operating leases (without double-counting with interest expense) by the
     Company and its Subsidiaries (other than the Immaterial Subsidiaries) PLUS
     preferred stock dividends paid by the Company and its Subsidiaries (other
     than the Immaterial Subsidiaries) (on a consolidated basis) PLUS all
     taxes paid by the Company and its Subsidiaries (other than the
     Immaterial Subsidiaries) PLUS Capital Expenditures of the Company
     and its Subsidiaries (other than the Immaterial Subsidiaries), in each case
     during such Computation Period, PLUS (y) scheduled maturities of long-term
     debt of the Company and its Subsidiaries (other than the Immaterial
     Subsidiaries) for the next succeeding four Fiscal Quarters (or, in the case
     of the Computation Periods ending on February 24, 1995 and May 26, 1995,
     for the next succeeding two or three Fiscal Quarters, respectively), to be
     less than 1.0 to 1.0."

     1.10 SECTION 10.6.7.  Section 10.6 is amended by adding a new Section
10.6.7 to read as follows:

          "10.6.7  MAXIMUM UNDERBILLINGS RATIO.  Not permit, as of the last day
     of any Fiscal Quarter, the ratio of (i) the product of (a) the sum of (x)
     the amount of the outstanding Trade Receivables-Unbilled as shown on a
     balance sheet of HazWaste PLUS (y) the amount of outstanding Work-In-
     Process as shown on a balance sheet of HazWaste multiplied by (b) 365 to
     (ii) the product of (a) the gross revenues of HazWaste for such Fiscal
     Quarter multiplied by (b) 4, to be greater than 70 to 1.0."

     1.11  SECTION 10.7.  Section 10.7 is amended in its entirety to read as
follows:

          "10.7  MERGERS, CONSOLIDATIONS, ACQUISITIONS AND SALES.  Not, and not
     permit any Subsidiary to, be a party to any merger or consolidation, or,
     except in the ordinary course of its business, sell, transfer, convey or
     lease all or any Substantial Part of its assets, or sell or assign with or


                                       -7-




     without recourse any receivables, or make any Acquisition, except for (i)
     any such merger or consolidation, sale, transfer, conveyance, lease or
     assignment of or by any Subsidiary into, with or to the Company or into,
     with or to any wholly-owned Subsidiary (other than any Immaterial
     Subsidiary); (ii) any such Acquisition by the Company or any Subsidiary
     (other than any Immaterial Subsidiary) of the assets or stock of any
     wholly-owned Subsidiary; or (iii) the HazWaste Merger.  For purposes of
     this SECTION 10.7, "SUBSTANTIAL PART" means 10% or more of the book value
     of the consolidated tangible assets of the Company and its Subsidiaries,
     taken as a whole."

     1.12 SECTION 10.12.  Section 10.12 is amended by deleting the amount
"$4,000,000" therein and substituting the amount "$5,000,000" therefor.

     1.13 SECTION 10.20.  Section 10.20 is amended in its entirety to read as
follows:

          "10.20  BUSINESS ACTIVITIES.  Not, and not permit any Subsidiary to,
     engage in any business activity other than environmental assessment, site
     remediation, environmental and hazardous waste management, infrastructure,
     construction management and analytical laboratory services and contract
     operations for wastewater facilities, and such other activities as are
     reasonably incidental to any of the foregoing."

     1.14 SCHEDULE I.  Schedule I to the Credit Agreement is deleted and
SCHEDULE I attached hereto is substituted therefor.

     1.15 EXHIBIT C.  Exhibit C to the Credit Agreement is deleted and the
EXHIBIT C attached hereto is substituted therefor.

     SECTION 2  REPRESENTATIONS AND WARRANTIES.  The Company represents and
warrants to the Agent and the Banks that (a) the execution and delivery by the
Company of this Second Amendment, the New Note (as defined below) and the
Company Pledge Amendment (as defined below) and the performance by the Company
of its obligations under the Credit Agreement as amended by this Second
Amendment (as so amended, the "Amended Credit Agreement"), the New Note and the
Company Pledge Agreement as amended by the Company Pledge Amendment (as so
amended, the "Amended Company Pledge Agreement") (i) are within the corporate
powers of the Company, (ii) have been duly authorized by all necessary corporate
action, (iii) have received all necessary governmental approval and (iv) do not
and will not contravene or conflict with any provision of law or of the charter
or by-laws of the Company or of any indenture, loan agreement or other contract,
order or decree which is binding upon the Company and (b) each of the Amended
Credit Agreement, the New Note and the Amended Company Pledge Agreement is the
legal, valid and binding obligation of



                                       -8-




the Company, enforceable against the Company in accordance with its terms.

     SECTION 3   EFFECTIVENESS.  The amendments set forth in SECTION 1 above
shall become effective, as of the day and year first above written, on such
date (the "Second Amendment Effective Date") when the Agent shall have
received (a) evidence that the HazWaste Merger has occurred, (b) the fee
required to be paid pursuant to the letter agreement dated as of the date
hereof between the Agent and the Company, (c) evidence, satisfactory to the
Agent, that all existing indebtedness for borrowed money of HazWaste and its
Subsidiaries has been (or concurrently with the effectiveness hereof will be)
paid in full and that all liens securing such indebtedness have been (or
concurrently with the effectiveness hereof will be) terminated and (d) each
of the following documents, each in form and substance satisfactory to the
Agent and each Bank.

     3.1  SECOND AMENDMENT.  Counterparts of this Second Amendment executed by
the parties hereto.

     3.2  NEW NOTE.  The promissory note of the Company (the "New Note"),
substantially in the form of Exhibit A to the Credit Agreement, payable to the
order of Bank of America Illinois in the principal amount of $25,000,000.

     3.3  SUBSIDIARY GUARANTY.  A counterpart of the Subsidiary Guaranty duly
executed by HazWaste and each of its Subsidiaries.

     3.4  SECURITY AGREEMENT.  A counterpart of the Security Agreement duly
executed by HazWaste and each of its Subsidiaries.

     3.5  COMPANY PLEDGE AGREEMENT AMENDMENT.  An amendment (the "Company Pledge
Amendment") to the Company Pledge Agreement, duly executed by the Company and
the Agent, in form and substance satisfactory to the Agent, together with all
collateral and other items required to be delivered in connection therewith.

     3.6  SUBSIDIARY PLEDGE AGREEMENT.  A pledge agreement (the "HazWaste
Subsidiary Pledge Agreement"), substantially in the form of Exhibit H to the
Credit Agreement, duly executed by HazWaste, together with all collateral and
other items required to be delivered in connection therewith.

     3.7  UCC FINANCING STATEMENTS.  Evidence, satisfactory to the Agent, that
all filings (including, without limitation, UCC-1 Financing Statements) and
other actions necessary to perfect the Agent's Lien on any collateral granted
under the Security Agreement have been duly made and are in full force and
effect.

     3.8  RESOLUTIONS.  Certified copies of resolutions of the Board of
Directors of the Company authorizing the execution and delivery of this Second
Amendment, the New Note and the Company Pledge Amendment and the performance by
the Company of its obligations under the Amended Credit Agreement, the New Note
and


                                       -9-




the Amended Company Pledge Agreement; and certified copies of resolutions of the
Board of Directors of each of HazWaste and each of its Subsidiaries authorizing
the execution and delivery by such entity of the Subsidiary Guaranty, the
Security Agreement and, in the case of HazWaste, the HazWaste Subsidiary Pledge
Agreement and the performance by such entity of its obligations under the
Subsidiary Guaranty, the Security Agreement and, in the case of HazWaste, the
HazWaste Subsidiary Pledge Agreement.

     3.9  INCUMBENCY CERTIFICATES.  A certificate of the Secretary or an
Assistant Secretary of each of the Company, HazWaste and each of HazWaste's
Subsidiaries as to the incumbency and signatures of the officers of such entity
who will be executing (a) in the case of the Company, this Second Amendment, and
(b) in the case of each such entity, any document pursuant hereto.

     3.10  CONFIRMATION.  A confirmation in the form of ATTACHMENT I hereto from
each of the Guarantors (other than HazWaste and its Subsidiaries).

     3.11  OPINION.  The opinions of Skadden, Arps, Slate, Meagher & Flom,
special counsel to the Company and its Subsidiaries (including HazWaste and its
Subsidiaries), and Williams, Mullen, Christian & Dobbins, counsel to HazWaste
and its Subsidiaries, in each case in form and substance satisfactory to the
Agent.

     3.12 MERGER AGREEMENT.  A certified copy of the Agreement and Plan of
Merger dated as of October 24, 1994 among the Company, ET-Sub II, Inc. and
HazWaste.

     SECTION 4  MISCELLANEOUS.

     4.1  CONTINUING EFFECTIVENESS, ETC.  As herein amended, the Credit
Agreement shall remain in full force and effect and is hereby ratified and
confirmed in all respects.  After the effectiveness hereof, all references in
the Credit Agreement, the New Note and the other Loan Documents to "Credit
Agreement", "Agreement" or similar terms shall refer to the Amended Credit
Agreement.

     4.2  COUNTERPARTS.  This Second Amendment may be executed in any number of
counterparts and by the different parties on separate counterparts, and each
such counterpart shall be deemed to be an original but all such counterparts
shall together constitute one and the same Second Amendment.

     4.3  GOVERNING LAW.  This Second Amendment shall be a contract made under
and governed by the internal laws of the State of Illinois.

     4.4  SUCCESSORS AND ASSIGNS.  This Second Amendment shall be binding upon
the Company, the Banks and the Agent and their respective successors and
assigns, and shall inure to the benefit


                                      -10-





of the Company, the Banks and the Agent and the respective successors and
assigns of the Agent and the Banks.

     Delivered at Chicago, Illinois, as of the day and year first above written.


                                        THE EARTH TECHNOLOGY
                                          CORPORATION (USA)



                                        By  /s/ Diane C. Creel
                                          ---------------------------------
                                          Title  Chairwoman, CEO & President
                                               ----------------------------


                                        BANK OF AMERICA ILLINOIS,
                                          individually and as Agent



                                        By /s/ Paul R. Fry
                                          ---------------------------------
                                          Senior Vice President





                                      -11-