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                                                                    EXHIBIT 4.32



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                       TRANSAMERICAN REFINING CORPORATION,

                                   as Issuer,



                                       and



                           FIRST UNION NATIONAL BANK,

                                   as Trustee



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


                          FIRST SUPPLEMENTAL INDENTURE

                        Effective as of December 15, 1998

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



               $200,000,000 16% Senior Subordinated Notes due 2003



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                          FIRST SUPPLEMENTAL INDENTURE

         THIS FIRST SUPPLEMENTAL INDENTURE, effective as of December 15, 1998
(the "Supplemental Indenture"), is made and entered into by and among
TRANSAMERICAN REFINING CORPORATION, a Texas corporation (the "Company"), and
FIRST UNION NATIONAL BANK (the "Trustee"), under an Indenture dated as of
December 30, 1997, by and between the Company and the Trustee (the "Original
Indenture"). All capitalized terms used in this Supplemental Indenture that are
defined in the Original Indenture, either directly or by reference therein, have
the respective meanings assigned to them therein, except to the extent such
terms are otherwise defined in this Supplemental Indenture or the context
clearly requires otherwise.

         WHEREAS, Section 9.2 of the Original Indenture provides, among other
things, that, with the consent of the Holders of not less than a majority in
aggregate Value of then outstanding Notes or, with respect to certain matters,
not less than 66-2/3% in aggregate Value of the Notes at the time outstanding,
the Company, when authorized by Board Resolutions, and the Trustee may amend or
supplement the Original Indenture or the Security Documents or enter into an
indenture supplemental thereto for the purposes of adding any provisions to or
changing in any manner or eliminating any of the provisions of the Original
Indenture or the Security Documents or of modifying in any manner the rights of
the Holders under the Original Indenture or the Notes; and

         WHEREAS, the Company has solicited consents from the Holders of the
Notes (the "Consent Solicitation") to amendments (the "Proposed Amendments") to
(i) the Original Indenture and (ii) the Registration Rights Agreement dated
December 30, 1998 by and among the Company and Jefferies & Company, Inc.; and

         WHEREAS, the Holders of at least 66-2/3% in aggregate Value of Notes at
the time outstanding have consented to the Proposed Amendments pursuant to the
Consent Solicitation; and

         WHEREAS, the Board of Directors of the Company has adopted resolutions
authorizing and approving the Proposed Amendments and the Company and the
Trustee are executing and delivering this Supplemental Indenture in order to
provide for such amendments;

         NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties to this Supplemental
Indenture hereby agree as follows:


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                                    ARTICLE I
                        AMENDMENTS TO ORIGINAL INDENTURE

         Section 1.01. Amended Definitions. The following definitions in Section
1.1 of the Original Indenture are hereby amended as follows:

         (a) The definition of "Accounts Receivable Subsidiary" is hereby
         amended to read in its entirety as follows:

                           "Accounts Receivable Subsidiary" means a subsidiary
                  of TEC, the Company, TCR Holding or TransContinental
                  designated as an Accounts Receivable Subsidiary for the
                  purpose of financing the accounts receivable of
                  TransContinental.

         (b) The definition of "Affiliate" is hereby amended to read in its
         entirety as follows:

                           "Affiliate" means, with respect to any specified
                  Person, (i) any other Person directly or indirectly
                  controlling or controlled by, or under direct or indirect
                  common control with, such specified Person or (ii) any
                  officer, director or controlling shareholder of such other
                  Person. For purposes of this definition, the term "control"
                  means (a) the power to direct the management and policies of a
                  Person, directly or through one or more intermediaries,
                  whether through the ownership of voting securities, by
                  contract, or otherwise, or (b) without limiting the foregoing,
                  the beneficial ownership of 10% or more of the voting power of
                  the voting common equity of such Person (on a fully diluted
                  basis) or of warrants or other rights to acquire such equity
                  (regardless of whether presently exercisable). Notwithstanding
                  the foregoing, none of the Purchasers shall be deemed to be
                  "Affiliates" of the Company or any of its Subsidiaries.

         (c) The definition of "Capital Improvement Program" is hereby amended
         to read in its entirety as follows:

                           "Capital Improvement Program" means the expansion and
                  improvement program at the Company (or, after the Transaction
                  Closing Date, TransContinental).

         (d) The definition of "CATOFIN(R) Unit" is hereby amended to read in
         its entirety as follows:

                           "CATOFIN(R) Unit" means certain real property owned
                  by the Company before the Transaction Closing Date as more
                  specifically defined in the security documents relating to the
                  TEC Notes, together with all personal property of
                  TransContinental now or hereinafter located on such real
                  property but only to the extent that such property is part of
                  a refining unit designed to produce propane and butane
                  mono-olefins using the CATOFIN(R) process.

         (e) The definition of "Change of Control" is hereby deleted in its
         entirety.

         (f) The definition of "Consolidated Fixed Charge Coverage Ratio" is
         hereby amended to read in its entirety as follows:



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                           "Consolidated Fixed Charge Coverage Ratio" on any
                  date (the "Transaction Date") means, with respect to any
                  Person, the ratio, on a pro forma basis, of (i) (x) with
                  respect to any Person other than TCR Holding, the aggregate
                  amount of Consolidated EBITDA of such Person (attributable to
                  continuing operations and businesses and exclusive of the
                  amounts attributable to operations and businesses discontinued
                  or disposed of, on a pro forma basis as if such operations and
                  businesses were discontinued or disposed of on the first day
                  of the Reference Period) for the Reference Period or (y) with
                  respect to TCR Holding, the aggregate amount of dividends and
                  other distributions on the Capital Stock of TransContinental
                  received by TCR Holding from TransContinental during the
                  Reference Period to (ii) the aggregate Consolidated Fixed
                  Charges of such Person (exclusive of amounts attributable to
                  discontinued operations and businesses on a pro forma basis as
                  if such operations and businesses were discontinued or
                  disposed of on the first day of the Reference Period, but only
                  to the extent that the obligations giving rise to such
                  Consolidated Fixed Charges would no longer be obligations
                  contributing to such Person's Consolidated Fixed Charges
                  subsequent to the Transaction Date) during the Reference
                  Period; provided, that for purposes of such computation, in
                  calculating Consolidated EBITDA and Consolidated Fixed
                  Charges, (a) the transaction giving rise to the need to
                  calculate the Consolidated Fixed Charge Coverage Ratio shall
                  be assumed to have occurred on the first day of the Reference
                  Period, (b) the incurrence of any Debt or issuance of
                  Disqualified Capital Stock or the retirement of any Debt or
                  Capital Stock during the Reference Period or subsequent
                  thereto and on or prior to the Transaction Date shall be
                  assumed to have occurred on the first day of such Reference
                  Period, (c) Consolidated Interest Expense attributable to any
                  Debt (whether existing or being incurred) bearing a floating
                  interest rate shall be computed as if the rate in effect on
                  the Transaction Date had been the applicable rate for the
                  entire period, unless such Person or any of its Subsidiaries
                  is a party to a Swap Obligation (that remains in effect for
                  the 12-month period after the Transaction Date) that has the
                  effect of fixing the interest rate on the date of computation,
                  in which case such rate (whether higher or lower) shall be
                  used.

         (g) The definitions of "Construction Supervisor" and "Debt" are hereby
         amended to read in their entirety as follows:

                           "Construction Supervisor" means Baker & O'Brien,
                  Inc., as construction supervisor of the Capital Improvement
                  Program or any successor construction supervisor appointed by
                  TEC with the approval of TCR Holding, which approval shall not
                  be unreasonably withheld.

                           "Debt" means with respect to any person, without
                  duplication (i) all liabilities, contingent or otherwise, of
                  such Person (a) for borrowed money (whether or not the
                  recourse of the lender is to the whole of the assets of such
                  Person or only to a portion thereof), (b) evidenced by bonds,
                  notes, debentures, or similar instruments or letters of credit
                  or representing the balance deferred and unpaid of the
                  purchase price of any property acquired by such Person or
                  services received by such Person (other than long-term
                  services or supply contracts which required minimum periodic
                  payments), (c) evidenced by bankers' acceptances or similar
                  instruments issued or accepted by banks or Swap Obligations,
                  (d) for the payment of money relating to a Capitalized Lease
                  Obligation, (e) the Attributable Debt associated with any Sale
                  and Leaseback Transaction or (f) Dollar-Denominated




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                  Production Payments that TransTexas or any of its Subsidiaries
                  elect to treat as Debt (excluding all other Permitted
                  Production Payment Obligations); (ii) reimbursement
                  obligations of such Person with respect to letters of credit;
                  (iii) all liabilities of others of the kind described in the
                  preceding clause (i) or (ii) that such Person has guaranteed
                  or that is otherwise its legal liability (to the extent of
                  such guaranty or other legal liability) other than for
                  endorsements, with recourse, of negotiable instruments in the
                  ordinary course of business; (iv) all obligations secured by a
                  Lien (other than Permitted Liens, except to the extent the
                  obligations secured by such Permitted Liens are otherwise
                  included in clause (i), (ii) or (iii) of this definition and
                  are obligations of such Person) to which the property or
                  assets (including, without limitation, leasehold interests and
                  any other tangible or intangible property rights) of such
                  Person are subject, regardless of whether the obligations
                  secured thereby shall have been assumed by or shall otherwise
                  be such Person's legal liability (but, if such obligations are
                  not assumed by such Person or are not otherwise such Person's
                  legal liability, the amount of such Debt shall be deemed to be
                  limited to the fair market value of such property or assets
                  determined as of the end of the preceding fiscal quarter); and
                  (v) any and all deferrals, renewals, extensions, refinancings,
                  and refundings (whether direct or indirect) of, or amendments,
                  modifications, or supplements to, any liability of the kind
                  described in any of the preceding clauses (i) through (iv)
                  regardless of whether between or among the same parties.
                  Notwithstanding anything to the contrary contained herein, for
                  purposes of Section 4.11, notes issued in satisfaction of the
                  interest obligation on up to $150 million principal amount of
                  15% Senior Secured Notes due 2003 issued pursuant to the
                  Transaction in accordance with the terms thereof shall not
                  constitute Debt except for purposes of the third to last and
                  second to last paragraphs of Section 4.11.


         (h) The definition of "Disqualified Capital Stock" is hereby amended to
         read in its entirety as follows:

                           "Disqualified Capital Stock" means, with respect to
                  any Person, any Capital Stock of such Person or its
                  Subsidiaries that, by its terms of any security into which it
                  is convertible or exchangeable, is, or upon the happening of
                  an event or the passage of time would be, required to be
                  redeemed or repurchased by such Person or its Subsidiaries,
                  including at the option of the holder, in whole or in part, or
                  has, or upon the happening of an event or passage of time
                  would have, a redemption or similar payment due, on or prior
                  to June 30, 2003.

         (i) The definition of "Gas Purchase Agreement" is hereby amended to
         read in its entirety as follows:

                           "Gas Purchase Agreement" means the Interruptible Gas
                  Sales Terms and Conditions between the Company and TransTexas,
                  as in effect on the Issue Date and as amended from time to
                  time, provided that any such amendment is approved by the
                  Board of Directors of each of the parties thereto.

         (j) The definition of "Insurance Proceeds" is hereby amended to read in
         its entirety as follows:



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                           "Insurance Proceeds" means the interest in and to all
                  proceeds (net of costs of collection, including attorney's
                  fees) which now or hereafter may be paid under any insurance
                  policies now or hereafter obtained by or on behalf of the
                  Company, TEC, TCR Holding, TransContinental, TransTexas, or
                  any Guarantor in connection with any assets thereof, together
                  with interest payable thereon and the right to collect and
                  receive the same, including, without limitation, proceeds of
                  casualty insurance, title insurance, business interruption
                  insurance and any other insurance now or hereafter maintained
                  with respect to such assets.

         (k) The definition of "Permitted Investment" is hereby amended to read
         in its entirety as follows:

                           "Permitted Investment" means, when used with
                  reference to the Company or its Subsidiaries, (i) trade credit
                  extended to persons in the ordinary course of business; (ii)
                  purchases of Cash Equivalents; (iii) Investments by any of the
                  TARC Entities or any of the TCR Holding Entities in any of the
                  TCR Holding Entities or in TransContinental and Investments by
                  any of the TCR Holding Entities in any of the TARC Entities;
                  (iv) Swap Obligations; (v) the receipt of Capital Stock in
                  lieu of cash in connection with the settlement of litigation;
                  (vi) advances to officers and employees in connection with the
                  performance of their duties in the ordinary course of business
                  in an amount not to exceed $3 million in the aggregate
                  outstanding at any time; (vii) margin deposits in connection
                  with Permitted Hedging Transactions; (viii) an Investment in
                  one or more Unrestricted Subsidiaries of the Company in an
                  aggregate amount not in excess of $10,000,000 (net of returns
                  on investment) plus the assets comprising the CATOFIN(R) Unit
                  owned by the Company as of the date hereof, less the amount of
                  any Unrestricted Non-Recourse Debt outstanding of the Company
                  or any of its Subsidiaries; (ix) deposits permitted by the
                  definition of Permitted Liens or any extension, renewal, or
                  replacement of any of them; (x) Investments in Accounts
                  Receivables Subsidiary Notes by any of the TARC Entities or
                  any of the TCR Holding Entities in amounts not to exceed the
                  greater of $20 million or 20% of the TransContinental
                  Borrowing Base at any one time; (xi) Investments by the
                  Company in a reincorporation subsidiary in connection with the
                  initial capitalization thereof and not to exceed $1,000; (xii)
                  Investments by the Company or any of its wholly owned
                  Subsidiaries in an aggregate amount not to exceed $250,000,
                  for the purpose of facilitating a redemption, repurchase or
                  other retirement for value of the Old TARC Warrants or the
                  conversion of the Old TARC Warrants into the right to receive
                  cash; (xiii) a guaranty by a Subsidiary of the Company
                  permitted under clause (h) of Section 4.11; (xiv) deposits
                  permitted by the definition of "Permitted Liens" or any
                  extension, renewal, or replacement of any of them; (xv) other
                  Investments not in excess of $5 million at any time
                  outstanding; (xvi) loans made (X) to officers, directors and
                  employees of the Company or any of its Subsidiaries approved
                  by the applicable Board of Directors (or by an authorized
                  officer), the proceeds of which are used solely to purchase
                  stock or to exercise stock options received pursuant to an
                  employee stock option plan or other incentive plan, in a
                  principal amount not to exceed the purchase price of such
                  stock or the exercise price of such stock options, as
                  applicable and (Y) to refinance loans, together with accrued
                  interest thereon made pursuant to this clause, in each case
                  not in excess of $3 million in the aggregate outstanding at
                  any one time, (xvii) Investments in money market mutual or
                  similar funds having assets in excess of $100,000,000 and
                  (xviii)

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                  the purchase or other acquisition by TARC, TCR Holding and
                  their Subsidiaries of TEC Notes or by TCR Holding and its
                  Subsidiaries of Notes or Series C/D Notes.

         (l) The definition of "Permitted Liens" is hereby amended to read in
         its entirety as follows:

                           "Permitted Liens" means (a) Liens imposed by
                  governmental authorities for taxes, assessments, or other
                  charges not yet due or which are being contested in good faith
                  and by appropriate proceedings, if adequate reserves with
                  respect thereto are maintained on the books of the Company or
                  any of its Subsidiaries in accordance with GAAP; (b) statutory
                  Liens of landlords, carriers, warehousemen, mechanics,
                  materialmen, repairmen, mineral interest owners, or other like
                  Liens arising by operation of law in the ordinary course of
                  business provided that (i) the underlying obligations are not
                  overdue for a period of more than 60 days, or (ii) such Liens
                  are being contested in good faith and by appropriate
                  proceedings and adequate reserves with respect thereto are
                  maintained on the books of the Company or any of its
                  Subsidiaries in accordance with GAAP; (c) deposits of cash or
                  Cash Equivalents to secure (i) the performance of bids, trade
                  contracts (other than borrowed money), leases, statutory
                  obligations, surety bonds, performance bonds, and other
                  obligations of a like nature incurred in the ordinary course
                  of business (or to secure reimbursement obligations or letters
                  of credit issued to secure such performance or other
                  obligations) in an aggregate amount outstanding at any one
                  time not in excess of $5 million or (ii) appeal or supersedeas
                  bonds (or to secure reimbursement obligations or letters of
                  credit in support of such bonds); (d) easements, servitudes,
                  rights-of-way, zoning, similar restrictions and other similar
                  encumbrances or title defects incurred in the ordinary course
                  of business which, in the aggregate, are not material in
                  amount and which do not, in any case, materially detract from
                  the value of the property subject thereto (as such property is
                  used by any of the TARC Entities) or materially interfere with
                  the ordinary conduct of the business of any of the TARC
                  Entities including without limitation, any easement or
                  servitude granted in connection with the financing of the
                  Storage Assets; (e) Liens arising by operation of law in
                  connection with judgments, only to the extent, for an amount
                  and for a period not resulting in an Event of Default with
                  respect thereto; (f) Liens securing Debt or other obligations
                  not in excess of $3 million; (g) pledges or deposits made in
                  the ordinary course of business in connection with worker's
                  compensation, unemployment insurance, other types of social
                  security legislation, property insurance and liability
                  insurance; (h) Liens on Equipment, Receivables and Inventory;
                  (i) Liens on the assets of any entity existing at the time
                  such assets are acquired by any of the TARC Entities, whether
                  by merger, consolidation, purchase of assets or otherwise so
                  long as such Liens (i) are not created, incurred or assumed in
                  contemplation of such assets being acquired by any of the TARC
                  Entities and (ii) do not extend to any other assets of any of
                  the TARC Entities; (j) Liens (including extensions and
                  renewals thereof) on real or personal property, acquired after
                  the Issue Date ("New Property"); provided, however, that (i)
                  such Lien is created solely for the purpose of securing Debt
                  Incurred to finance the cost (including the cost of
                  improvement or construction) of the item of New Property
                  subject thereto and such Lien is created at the time of or
                  within six months after the later of the acquisition, the
                  completion of construction, or the commencement of full
                  operations of such New Property, (ii) the principal amount of
                  the Debt secured by such Lien does not exceed 100% of such
                  costs plus reasonable financing fees and other associated
                  reasonable out-of-pocket expenses and (iii) any such Lien
                  shall not extend to or cover any property or assets other than
                  such item of New


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                  Property and any improvements on such New Property; (k) leases
                  or subleases granted to others that do not materially
                  interfere with the ordinary course of business of any of the
                  TARC Entities, taken as a whole; (l) Liens on the assets of
                  one of the TARC Entities in favor of another TARC Entity; (m)
                  Liens securing reimbursement obligations with respect to
                  letters of credit that encumber documents relating to such
                  letters of credit and the products and proceeds thereof;
                  provided, that, such reimbursement obligations are not matured
                  for a period of over 60 days; (n) Liens in favor of customs
                  and revenue authorities arising as a matter of law to secure
                  payment of customs duties in connection with the importation
                  of goods; (o) Liens encumbering customary initial deposits and
                  margin deposits securing Swap Obligations or Permitted Hedging
                  Transactions and Liens encumbering contract rights under
                  Permitted Hedging Transactions; (p) Liens on cash deposits to
                  secure reimbursement obligations with respect to letters of
                  credit after the Delayed Coking Unit is completed; (q) Liens
                  that secure Unrestricted Non-Recourse Debt; provided, however,
                  that at the time of incurrence the aggregate fair market value
                  of the assets securing such Lien (exclusive of the stock of
                  the applicable Unrestricted Subsidiary) shall not exceed the
                  amount of allowed Unrestricted Non-Recourse Debt of the
                  Company or TCR Holding; (r) Liens on the proceeds of any
                  property subject to a Permitted Lien and Liens on the proceeds
                  of any Debt Incurred in accordance with the provisions hereof,
                  or on deposit accounts containing any such proceeds; (s) Liens
                  imposed in connection with Debt incurred pursuant to clause
                  (f) of Section 4.11; provided, that such liens, if not
                  Permitted Liens, do not extend to property other than the
                  Storage Assets, the proceeds of financing related to the
                  Storage Assets or deposit accounts containing such proceeds;
                  and (t) any extension, renewal or replacement of the Liens
                  created pursuant to any of clauses (a) through (g), (i)
                  through (s) or (u) provided that such Liens would have
                  otherwise been permitted under such clauses, and provided
                  further that the Liens, permitted by this clause (t) do not
                  secure any additional Debt or encumber any additional
                  property; (u) Liens that secure Senior Debt; (v) Liens on any
                  property of the Company or its Subsidiaries (or any agreement
                  to grant such Liens) securing the Series C/D Notes or the
                  Notes, (w) Liens on any Property owned by TransContinental and
                  (x) Liens on any Property owned by the Company or TCR Holding
                  to secure Debt permitted by clause (s) of Section 4.11.

         (m) The definition of "Phase I Completion Date" is hereby amended to
         read in its entirety as follows:

                           "Phase I Completion Date" means the date on which the
                  Construction Supervisor issues a written notice (the "Phase I
                  Completion Notice") to TEC certifying that the Phase I
                  Performance Test has been completed.


         (n) A definition of "Phase I Performance Test " is hereby added to the
         Original Indenture to read in its entirety as follows:

                           "Phase I Performance Test" means for a period of at
                  least 72 uninterrupted hours, TransContinental's refinery has
                  sustained (i) an average feedstock throughput level of at
                  least 150,000 barrels per day and (ii) no net production of
                  vacuum tower bottoms when using as input a combined feedstock
                  slate with an average API Gravity of 22 degrees or less.


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         (o) The definition of "Phase II Completion Date" is hereby amended to
         read in its entirety as follows:

                           "Phase II Completion Date" means the date on which
                  the Construction Supervisor issues a written notice (the
                  "Phase II Completion Notice") to TEC certifying that for a
                  period of at least 72 uninterrupted hours, TransContinental's
                  refinery has sustained (i) an average feedstock throughput
                  level of at least 180,000 barrels per day and (ii) average
                  production yields (measured as the liquid volume percent of
                  feedstock throughput) of refined products with a specific
                  gravity of gasoline or lighter of at least 40% and of middle
                  distillates or lighter of at least 60%, when using a combined
                  Crude Unit feedstock slate with an average API Gravity of 22
                  degrees or less.

         (p) The definition of "Plans" is hereby amended to read in its entirety
         as follows:

                           "Plans" means (a) the plans and specifications
                  prepared by or on behalf of the Company (or, after the
                  Transaction Closing Date, TransContinental), which describe
                  and show the proposed expansion and modification of the
                  Company's (or, after the Transaction Closing Date,
                  TransContinental's) refinery as amended from time to time with
                  the consent of the Construction Supervisor and (b) a budget
                  prepared by or on behalf of the Company (or, after the
                  Transaction Closing Date, TransContinental) as amended from
                  time to time with the consent of the Construction Supervisor.

         (q) A definition of "Purchasers" is hereby added to the Original
         Indenture to read in its entirety as follows:

                           "Purchasers" means the initial purchasers from TARC
                  pursuant to the Transaction of voting stock of TCR Holding and
                  their transferees and Affiliates (in each case other than the
                  Company and its Subsidiaries).

         (r) A definition of "Refinery Assets" is hereby added to the Original
         Indenture to read in its entirety as follows:

                           "Refinery Assets" means substantially all of the
                  assets of TARC immediately prior to the Transaction Closing
                  Date.

         (s) The definition of "Related Person" is hereby amended to read in its
         entirety as follows:

                           "Related Person" means (i) any Person (other than a
                  Purchaser or TransContinental and any of its Subsidiaries)
                  directly or indirectly controlling or controlled by or under
                  direct or indirect common control with the Company or any
                  Subsidiary of the Company or any officer, director, or
                  employee of the Company or any Subsidiary of the Company or of
                  such Person, (ii) the spouse, any immediate family member, or
                  any other relative who has the same principal residence of any
                  Person described in clause (i) above, and any Person, directly
                  or indirectly, controlling or controlled by or under direct or
                  indirect common control with, such spouse, family member, or
                  other relative, and (iii) any trust in which any Person
                  described in clause (i) or (ii), above, is a fiduciary or has
                  a beneficial interest. For purposes of this definition the
                  term "control" means (a) the power


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                  to direct the management and policies of a Person, directly or
                  through one or more intermediaries, whether through the
                  ownership of voting securities, by contract, or otherwise, or
                  (b) the beneficial ownership of 10% or more of the voting
                  common equity of such Person (on a fully diluted basis) or of
                  warrants or other rights to acquire such equity (whether or
                  not presently exercisable).

         (t) The definition of "Restricted Payment" is hereby amended to read in
         its entirety as follows:

                           "Restricted Payment" means, with respect to any
                  Person, (i) any Restricted Investment, (ii) any dividend or
                  other distribution on shares of Capital Stock of such Person
                  or any Subsidiary of such Person (iii) any payment on account
                  of the purchase, redemption, or other acquisition or
                  retirement for value of any shares of Capital Stock of such
                  Person, and (iv) any defeasance, redemption, repurchase, or
                  other acquisition or retirement for value, or any payment in
                  respect of any amendment in anticipation of or in connection
                  with any such retirement, acquisition, or defeasance, in whole
                  or in part, of any Pari Passu Debt or Subordinated Debt,
                  directly or indirectly, of such Person or a Subsidiary of such
                  Person prior to the scheduled maturity or prior to any
                  scheduled repayment of principal in respect of such Pari Passu
                  Debt or Subordinated Debt; provided, however, that the term
                  "Restricted Payment" does not include (i) any dividend,
                  distribution, or other payment on shares of Capital Stock of
                  an issuer solely in shares of Qualified Capital Stock of such
                  issuer that is at least as junior in ranking as the Capital
                  Stock on which such dividend, distribution, or other payment
                  is to be made, (ii) any dividend, distribution, or other
                  payment to the Company from TCR Holding or from any of the
                  Company's Subsidiaries or to TCR Holding by any of TCR
                  Holding's Subsidiaries, (iii) any defeasance, redemption,
                  repurchase, or other acquisition or retirement for value, in
                  whole or in part, of any Pari Passu Debt or Subordinated Debt
                  of such Person payable solely in shares of Qualified Capital
                  Stock of such Person, (iv) any payments or distributions made
                  pursuant to and in accordance with the Services Agreement, the
                  Expense Reimbursement Agreement, the Office Leases, the
                  Transfer Agreement or the Tax Allocation Agreement, (v) any
                  redemption, repurchase or other retirement for value of the
                  Old TARC Warrants by the Company, including any premium paid
                  thereon, (vi) the redemption, purchase, retirement or other
                  acquisition of any Debt including any premium paid thereon,
                  with the proceeds of any refinancing Debt permitted to be
                  incurred pursuant to clauses (o), (s) and (u) of the covenant
                  described herein under the heading "Limitation on the
                  Incurrences of Additional Debt and Issuances of Disqualified
                  Capital Stock," (vii) the purchase by the Company or TCR
                  Holding of shares of Capital Stock of the Company, TCR
                  Holding, TransContinental, TransTexas or TTXD in connection
                  with each of its employee benefit plans, including without
                  limitation any employee stock ownership plans or any employee
                  stock option plans, in an aggregate amount, with respect to
                  the issuer, not to exceed 7% of the aggregate number of shares
                  of voting stock held by nonaffiliates of the issuer measured
                  from the date of the first such purchase, (viii) distributions
                  of common stock of TransTexas to TEC, (ix) any dividend or
                  other distribution on the Capital Stock of any Subsidiary of
                  the Company, (x) any purchase of Capital Stock of TCR Holding
                  by the Company, (xi) any purchase of Capital Stock of
                  TransContinental by TCR Holding, (xii) any dividend or payment
                  on shares of Capital Stock of TCR Holding the proceeds of the
                  issuance of which are used to purchase TEC Notes and (xiii)
                  the TCR Holding Participating Preferred Stock Redemption.



                                      -10-
   11



         (u) The definition of "Senior Debt" is hereby amended to read in its
         entirety as follows:

                           "Senior Debt" means, all Debt of the Company or, with
                  respect to its use in the definition of "Permitted Liens"
                  only, TCR Holding, including, without limitation, the TARC
                  Discount Notes, the TARC Mortgage Notes, the TARC Working
                  Capital Loan and the TARC Intercompany Loan, now or hereafter
                  created, incurred, assumed or guaranteed by the Company (and
                  all renewals, extensions or refundings thereof or of any part
                  thereof) (including the principal of, interest on and fees,
                  premiums, expenses (including costs of collection),
                  indemnities and other amounts payable in connection with such
                  Indebtedness, and including Post-Commencement Amounts), unless
                  the instrument governing such Debt expressly provides that
                  such Debt is not senior or superior in right of payment to the
                  Notes. Notwithstanding the foregoing, Senior Debt of the
                  Company shall not include (i) Debt evidenced by the Series C/D
                  Notes and the Notes, (ii) Debt of the Company to any
                  Subsidiary of the Company or to any Unrestricted Subsidiary of
                  the Company (other than to facilitate the purchase of the
                  common stock purchase warrants of TARC), or (iii) any amounts
                  payable or other Debt to trade creditors created, incurred,
                  assumed or guaranteed by the Company or any Subsidiary of the
                  Company in the ordinary course of business in connection with
                  obtaining goods or services.

         (v) A definition of "Series C/D Notes" is hereby added to read in its
         entirety as follows:

                           "Series C/D Notes" means the Company's 16% Senior
                  Subordinated Notes due 2003 issued pursuant to the Indenture
                  dated March 16, 1998 between the Company and First Union
                  National Bank, as trustee, providing for the issuance of such
                  notes, as such may be amended, supplemented and restated from
                  time to time.

         (w) The definition of "Services Agreement" is hereby amended to read in
         its entirety as follows:

                           "Services Agreement" means the Services Agreement
                  among TNGC Holdings and its Subsidiaries, as in effect on the
                  Issue Date and as amended from time to time, provided that any
                  such amendment is approved by the Board of Directors of each
                  of the parties thereto that will be bound by such amendment.

         (x) The definition of "Subsidiary" is hereby amended to read in its
         entirety as follows:

                           "Subsidiary" with respect to any Person, means (i) a
                  corporation with respect to which such Person or its
                  Subsidiaries owns, directly or indirectly, at least fifty
                  percent of such corporation's Capital Stock with voting power,
                  under ordinary circumstances, to elect directors, or (ii) a
                  partnership in which such Person or a subsidiary of such
                  Person is, at the time, a general partner of such partnership
                  and has more than 50% of the total voting power of partnership
                  interests entitled (without regard to the occurrence of any
                  contingency) to vote in the election of managers thereof, or
                  (iii) any other Person (other than a corporation or a
                  partnership) in which such Person, one or more Subsidiaries of
                  such Person, or such Person and one or more Subsidiaries of
                  such Person, directly or indirectly, at the date of
                  determination thereof has (x) at least a fifty percent
                  ownership interest or (y) the power to elect or direct the
                  election of the directors or other governing body of such
                  other Person; provided, however, that "Subsidiary" shall not
                  include (i) for the


                                      -11-
   12



                  purposes of the Indenture provisions "Subsidiary Guarantees,"
                  and "Limitation on Transactions with Related Persons" a joint
                  venture an investment in which would constitute a Permitted
                  Investment, provided that, for purposes of the covenant
                  described herein under the heading "Limitation on Transactions
                  with Related Persons," such investment is not with a Related
                  Person other than solely because the party engaging in such
                  transaction has the ability to control the Related Person
                  under the definition of "Control" contained within the
                  definition of Related Person or (ii) any Unrestricted
                  Subsidiary of such Person; provided, further, however, that
                  TCR Holding and its subsidiaries other than TransContinental
                  shall be "Subsidiaries" of TARC (except for purposes of
                  Section 4.16) and TransContinental shall not be a "Subsidiary"
                  of any Person.

         (y) The definition of "TARC Intercompany Loan" is hereby amended to
         read in its entirety as follows:

                           "TARC Intercompany Loan" means the senior secured
                  promissory note from the Company to TEC in the fully accreted
                  principal amount of $920,000,000 upon substantially the terms
                  described in the Registration Statement on Form S-4, as
                  amended, of TEC under the heading "Description of Existing
                  Indebtedness -- TARC Intercompany Loan" and as amended from
                  time to time in accordance with its terms.

         (z) A definition of "TARC Intercompany Loan Amendment" is hereby added
         to the Original Indenture to read in its entirety as follows:

                           "TARC Intercompany Loan Amendment" means the second
                  amendment to the TARC Intercompany Loan Agreement upon
                  substantially the terms described in the form attached hereto
                  as Exhibit .

         (aa) A definition of "TransContinental" is hereby added to the Original
         Indenture to read in its entirety as follows:

                           "TransContinental" means TransContinental Refining
                  Corporation, a Delaware corporation, to which the Refinery
                  Assets will be transferred by TCR Holding pursuant to the
                  Transaction and, for purposes of Section 4.11 hereof, its
                  Subsidiaries.

         (bb) The definition of "TARC Borrowing Base" is hereby amended to read
         in its entirety as follows:

                           "TransContinental Borrowing Base" means, as of any
                  date, an amount equal to the sum of (a) 90% of the book value
                  of all accounts receivable owned by TransContinental and its
                  Subsidiaries (excluding any accounts receivable that are more
                  than 90 days past due, less (without duplication) the
                  allowance for doubtful accounts attributable to such current
                  accounts receivable) calculated on a consolidated basis and in
                  accordance with GAAP and (b) 85% of the current market value
                  of all inventory owned by TransContinental and its
                  Subsidiaries as of such date. To the extent that information
                  is not available as to the amount of accounts receivable as of
                  a specific date, TransContinental may utilize, to the extent
                  reasonable, the most recent available information for purposes
                  of calculating the TransContinental Borrowing Base.


                                      -12-
   13



         (cc) A definition of "TCR Holding" is hereby added to the Original
         Indenture to read in its entirety as follows:

                           "TCR Holding" means TCR Holding Corporation, a
                  Delaware corporation, to which the Refinery Assets will be
                  transferred by TARC pursuant to the Transaction.

         (dd) A definition of "TCR Holding Entities" is hereby added to the
         Original Indenture to read in its entirety as follows:

                           "TCR Holding Entities" means TCR Holding and each of
                  its Subsidiaries.

         (ee) A definition of "TCR Holding Participating Preferred Stock" is
         hereby added to the Original Indenture to read in its entirety as
         follows:

                           "TCR Holding Participating Preferred Stock" means the
                  participating preferred stock of TCR Holding issued pursuant
                  to the Transaction.

         (ff) A definition of "TCR Holding Participating Preferred Stock
         Redemption" is hereby added to the Original Indenture to read in its
         entirety as follows:

                           "TCR Holding Participating Preferred Stock
                  Redemption" means the redemption by TCR Holding of the TCR
                  Holding Participating Preferred Stock in exchange for (i) debt
                  securities of TCR Holding with an aggregate principal amount
                  equal to the liquidation preference of the TCR Holding
                  Participating Preferred Stock, with a maturity date of June 1,
                  2002 and bearing interest at a rate sufficient to pay interest
                  on the TARC Intercompany Loan, the Notes and the Series C/D
                  Notes and (ii) common stock of TCR Holding equal to 30.6% of
                  the equity interest in TCR Holding and 41% of the voting power
                  of TCR Holding's capital stock.


         (gg) A definition of "TARC Intercompany Subordinated Note" is hereby
         added to the Original Indenture to read in its entirety as follows:

                           "TARC Intercompany Subordinated Note" means that
                  certain note and related documents (i) evidencing debt of TCR
                  Holding to TARC in an amount and with principal and interest
                  payment terms sufficient to service the payment of interest
                  and principal on the Notes and the Series C/D Notes (after
                  giving effect to any amounts in any Interest Reserve Account)
                  and (ii) containing a covenant of TCR Holding to pledge the
                  stock it owns of TransContinental, if any, as of the date of
                  the payment in full of the TARC Intercompany Loan; provided,
                  that TCR Holding shall not be required to grant such Lien
                  until the TARC Intercompany Loan has been paid in full and has
                  not been refinanced, refunded or replaced with the proceeds of
                  Other Debt ("Other Debt"), which Other Debt has a lower cost
                  of capital to TCR Holding than the TARC Intercompany Loan and
                  the principal amount of such Other Debt (or, if such Other
                  Debt is issued with original issue discount, the original
                  issue amount of such Other Debt) is equal to or less than the
                  original issue price of, plus amortization of the original
                  issue discount on, the TARC Intercompany Loan at the time of
                  the incurrence of such Other Debt.


                                      -13-
   14



         (hh) A definition of "TARC Working Capital Loan" is hereby added to the
         Original Indenture to read in its entirety as follows:

                           "TARC Working Capital Loan" means a loan by TEC to
                  TARC of up to $50 million, which will be assumed by TCR
                  Holding pursuant to the Transaction.

         (ii) The definition of "Tax Allocation Agreement" is hereby amended to
         read in its entirety as follows:

                           "Tax Allocation Agreement" means the Tax Allocation
                  Agreement, dated as of August 24, 1993, among TNGC Holdings
                  Corporation, the Company, TEC and other subsidiaries of TNGC
                  Holdings Corporation, as in effect on the Issue Date and as
                  amended from time to time, provided that any such amendment is
                  approved by the Board of Directors of each of the parties
                  thereto that will be bound by such amendment.

         (jj) A definition of "Transaction" is hereby added to the Original
         Indenture to read in its entirety as follows:

                           "Transaction" means a series of related transactions
                  (as more fully described in the Company's Consent Solicitation
                  Statement dated October 5, 1998, as amended, pursuant to which
                  consents were solicited from the Holders to amendments to the
                  Indenture to facilitate the Transaction, which description is
                  incorporated herein by reference) pursuant to which, among
                  other things, (i) the Lien on the TARC Collateral (as defined
                  in the TEC Indenture) is released, (ii) TARC transfers to TCR
                  Holding the Refinery Assets in exchange for (x) all of the
                  capital stock of TCR Holding and (y) the assumption by TCR
                  Holding of certain debt and other obligations of TARC, (iii)
                  TCR Holding transfers to TransContinental the Refinery Assets
                  in exchange for all of the common stock of TransContinental
                  and TransContinental assumes the debt and other obligations of
                  TARC assumed by TCR Holding other than the TARC Working
                  Capital Loan and (iv) certain Purchasers purchase (x) debt
                  securities issued by TARC, (y) equity securities issued by
                  TransContinental and (z) TCR Holding Capital Stock from TARC
                  for aggregate gross proceeds of approximately $151 million.

         (kk) A definition of "Transaction Closing Date" is hereby added to the
         Original Indenture to read in its entirety as follows:

                           "Transaction Closing Date" means the date the
                  Refinery Assets are transferred by TARC to TCR Holding and by
                  TCR Holding to TransContinental pursuant to the Transaction.

         (ll) The definition of "Unrestricted Non-Recourse Debt" is hereby
         amended to read in its entirety as follows:

                           "Unrestricted Non-Recourse Debt" of the Company,
                  TransContinental or any of the Subsidiaries of the Company
                  means (i) Debt of such Person that is secured solely (other
                  than with respect to clause (ii) below) by a Lien upon the
                  stock of an Unrestricted Subsidiary of such Person and as to
                  which there is no recourse (other than with respect to


                                      -14-
   15



                  clause (ii) below) against such Person or any of its assets
                  other than against such stock (and the dollar amount of any
                  Debt of such Person as described in this clause (i) shall be
                  deemed to be zero for purposes of all other provisions of the
                  Indenture) and (ii) guarantees of the Debt of Unrestricted
                  Subsidiaries of such Person; provided, that the aggregate of
                  all Debt of such Person Incurred and outstanding pursuant to
                  clause (ii) of this definition, together with all Permitted
                  Investments (net of any return on such Investment) in
                  Unrestricted Subsidiaries of such Person, does not exceed (x)
                  20% of the Company's Consolidated EBITDA since the Phase II
                  Completion Date in the case of the Company, (y) 20% of TCR
                  Holding's Consolidated EBITDA since the Phase II Completion
                  Date in the case of TCR Holding or (z) 20% of
                  TransContinental's Consolidated EBITDA since the Phase II
                  Completion Date in the case of TransContinental plus in the
                  case of clause (ii) of this definition of Unrestricted
                  Non-Recourse Debt, Restricted Payments permitted to be made
                  pursuant to Section 4.3.

         Section 1.02. Section 4.3 of the Original Indenture. Section 4.3 of the
Original Indenture is hereby amended to read in its entirety as follows:

                           Section 4.3 Limitation on Restricted Payments. The
                  Company shall not, and shall not permit any of its
                  Subsidiaries to, directly or indirectly, make any dividend or
                  other distribution on shares of Capital Stock of the Company
                  or any Subsidiary of the Company or make any payment on
                  account of the purchase, redemption, or other acquisition or
                  retirement for value of any such shares of Capital Stock
                  unless such dividends, distributions, or payments are made in
                  cash or Capital Stock or a combination thereof. In addition,
                  the Company shall not, and shall not permit any of its
                  Subsidiaries to, directly or indirectly, make any Restricted
                  Payment; provided, however, that the Company or TCR Holding
                  may make a Restricted Payment if, at the time or after giving
                  effect thereto on a pro forma basis no Default or Event of
                  Default would occur or be continuing, and:

                           (i) in the case of Restricted Payments by the 
                  Company:

                                    (a) the Company's Consolidated Fixed Charge
                           Coverage Ratio exceeds 2.25 to 1; and

                                    (b) the aggregate amount of all Restricted
                           Payments made by all of the TARC Entities, including
                           such proposed Restricted Payment and all payments
                           that may be made pursuant to the proviso at the end
                           of this sentence (if not made in cash, then the fair
                           market value of any property used therefor), from and
                           after the Issue Date and on or prior to the date of
                           such Restricted Payment, would not exceed an amount
                           equal to (x) 50% of Adjusted Consolidated Net Income
                           of the Company accrued for the period (taken as one
                           accounting period) from the first full fiscal quarter
                           that commenced after the Issue Date to and including
                           the fiscal quarter ended immediately prior to the
                           date of each calculation for which financial
                           statements are available (or, if the Company's
                           Adjusted Consolidated Net Income for such period is a
                           deficit, then minus 100% of such deficit), plus (y)
                           the aggregate Net Proceeds received by the Company
                           from the issuance or sale (other than to a Subsidiary
                           of the Company) of its Qualified Capital Stock from
                           and after the Issue Date and on or prior to the date
                           of such Restricted Payment, minus (z) 100% of the


                                      -15-
   16



                           amount of any write-downs, write-offs, other negative
                           revaluations, and other negative extraordinary
                           charges not otherwise reflected in the Company's
                           Adjusted Consolidated Net Income during such period;
                           and

                  (ii)     in the case of Restricted Payments by TCR Holding:

                           (a) TCR Holding's Consolidated Fixed Charge Coverage
                           Ratio exceeds 2.25 to 1; and

                           (b) the aggregate amount of all Restricted Payments
                           made by all of the TCR Holding Entities, including
                           such proposed Restricted Payment and all payments
                           that may be made pursuant to the proviso at the end
                           of this sentence (if not made in cash, then the fair
                           market value of any property used therefor), from and
                           after the Transaction Closing Date and on or prior to
                           the date of such Restricted Payment, would not exceed
                           an amount equal to the sum of (w) $1,000,000, plus
                           (x) 50% of Adjusted Consolidated Net Income of TCR
                           Holding accrued for the period (taken as one
                           accounting period) from the first full fiscal quarter
                           that commenced after the Transaction Closing Date to
                           and including the fiscal quarter ended immediately
                           prior to the date of each calculation for which
                           financial statements are available (or, if TCR
                           Holding's Adjusted Consolidated Net Income for such
                           period is a deficit, then minus 100% of such
                           deficit), plus (y) the aggregate Net Proceeds
                           received by TCR Holding from the issuance or sale
                           (other than to a Subsidiary of TCR Holding) of its
                           Qualified Capital Stock from and after the
                           Transaction Closing Date and on or prior to the date
                           of such Restricted Payment, minus (z) 100% of the
                           amount of any write-downs, write-offs, other negative
                           revaluations, and other negative extraordinary
                           charges not otherwise reflected in TCR Holding's
                           Adjusted Consolidated Net Income during such period;

                  provided, that nothing in this Section 4.3 shall prohibit the
                  payment of any dividend within 60 days after the date of its
                  declaration if such dividend could have been made on the date
                  of its declaration in compliance with the foregoing
                  provisions.

         Section 1.03. Section 4.7 of the Original Indenture. Section 4.7(d) of
the Original Indenture is hereby deleted in its entirety.

         Section 1.04. Section 4.8 of the Original Indenture. Section 4.8 of the
Original Indenture is hereby amended to read as follows:

                           Section 4.8 SEC Reports. The Company shall deliver to
                  the Trustee and each Holder, within 15 days after it files the
                  same with the SEC, copies of all reports and information (or
                  copies of such portions of any of the foregoing as the SEC may
                  by rules and regulations prescribe), if any, which the Company
                  is required to file with the SEC pursuant to Section 13 or
                  15(d) of the Exchange Act. The Company shall include in all
                  such reports and information a summary of the status of the
                  Company's Capital Improvement Program, including a description
                  of sources of funds available for the completion of the
                  Capital Improvements Program. The Company agrees to continue
                  to be subject to and comply with


                                      -16-
   17


                  the filing and reporting requirements of the Commission as
                  long as any of the Notes are outstanding.

                           Concurrently with the reports delivered pursuant to
                  the preceding paragraph, the Company shall deliver to the
                  Trustee and to each Holder annual and quarterly financial
                  statements with appropriate footnotes of the Company and its
                  Subsidiaries, all prepared and presented in a manner
                  substantially consistent with those of the Company required by
                  the preceding paragraph. The Company shall also comply with
                  the other provisions of TIA Section 314(a).

                           The Company shall, upon request, provide to each
                  Holder and to each beneficial owner and prospective purchaser
                  of Notes identified by any Holder of Restricted Notes the
                  information required by clause (d)(4) of Rule 144A until the
                  earlier to occur of (i) there existing no further necessity
                  for an offer or sale of the Notes to qualify for an exemption
                  under such Rule or (ii) the consummation of a registered
                  exchange offer for the Notes.

         Section 1.05. Section 4.10 of the Original Indenture. Section 4.10 of
the Original Indenture is hereby amended as follows:

         (a) Section 4.10(a) of the Original Indenture is hereby amended to read
in its entirety as follows:

                           (a) The Company shall not, and shall not permit any
                  of its Subsidiaries to, enter directly or indirectly into, or
                  permit to exist, any transaction or series of related
                  transactions with any Related Person (including, without
                  limitation: (i) the sale, lease, transfer or other disposition
                  of properties, assets or securities to such Related Person,
                  (ii) the purchase or lease of any property, assets or
                  securities from such Related Person, (iii) an Investment in
                  such Related Person (excluding Investments permitted to be
                  made pursuant to clauses (iii), (vi), (viii), (x), (xi),
                  (xii), (xvi) and (xviii) of the definition of "Permitted
                  Investment"), and (iv) entering into or amending any contract
                  or agreement with or for the benefit of a Related Person
                  (each, a "Related Person Transaction")), except for (A)
                  permitted Restricted Payments, including for this purpose the
                  transactions excluded from the definition of Restricted
                  Payments by the proviso contained in the definition of
                  "Restricted Payments"; (B) transactions made in good faith,
                  the terms of which are (x) fair and reasonable to the Company
                  or such Subsidiary, as the case may be, and (y) at least as
                  favorable as the terms which could be obtained by the Company
                  or such Subsidiary, as the case may be, in a comparable
                  transaction made on an arm's length basis with Persons who are
                  not Related Persons; (C) transactions between the Company and
                  any of its Wholly Owned Subsidiaries or between Wholly Owned
                  Subsidiaries of the Company; (D) transactions pursuant to the
                  Services Agreement, the Tax Allocation Agreement, the Gas
                  Purchase Agreement, and the Expense Reimbursement Agreement,
                  in each case including amendments thereto that are approved by
                  the Board of Directors of each of the parties thereto that
                  will be bound by such amendments, and the Transfer Agreement,
                  the TARC Intercompany Loan and related security documents, and
                  the Registration Rights Agreement; (E) the lease of office
                  space to the Company or an Affiliate of the Company by
                  TransAmerican or an Affiliate of TransAmerican, provided that
                  payments thereunder do not exceed in the aggregate $200,000
                  per year; (F) any employee compensation arrangement in an
                  amount which together with the amount of all other cash
                  compensation paid to such


                                      -17-
   18



                  employee by the Company and its Subsidiaries does not provide
                  for cash compensation in excess of $5,000,000 in any fiscal
                  year of the Company or any Subsidiary and which has been
                  approved by a majority of the Company's Independent Directors
                  and found in good faith by such directors to be in the best
                  interests of the Company or such Subsidiary, as the case may
                  be; (G) loans to the Company and TCR Holding which are
                  permitted to be Incurred pursuant to the terms of Section
                  4.11; (H) the amounts payable by the TEC and its Subsidiaries
                  to Southeast Contractors for employee services provided to the
                  Company or TransContinental not exceeding the actual costs to
                  Southeast Contractors of the employees, which costs consist
                  solely of payroll and employee benefits, plus related
                  administrative costs and an administrative fee, not exceeding
                  $2,000,000 per year in the aggregate; (I) the Company and its
                  Subsidiaries may pay a management fee to TransAmerican in an
                  amount not to exceed $2,500,000 per year; (J) transactions
                  effected pursuant to the Transaction, including without
                  limitation (i) the execution, delivery and performance of the
                  TARC Intercompany Loan Amendment, the TCR Holding Pledge
                  Agreement, an amendment of the Services Agreement and a
                  Securities Purchase Agreement among TARC, TCR Holding,
                  TransContinental, TEC and certain of the Purchasers providing
                  for the sale to such Purchasers of Capital Stock of TCR
                  Holding owned by TARC pursuant to the Transaction, (ii) the
                  transfer of the Refinery Assets by TARC to TCR Holding and, as
                  consideration therefor, the issuance by TCR Holding to TARC of
                  Capital Stock of TCR Holding, the assumption by TCR Holding of
                  certain debt and obligations of TARC (including Debt of TARC
                  to the Purchasers and certain others), and (iii) the transfer
                  of the Refinery Assets by TCR Holding to TransContinental and,
                  as consideration therefor, the issuance by TransContinental of
                  its common stock to TCR Holding and the assumption by
                  TransContinental of certain debt and obligations of TCR
                  Holding; (K) the delivery of TEC Notes to TEC in satisfaction
                  of the TARC Intercompany Loan; (L) the issuance and sale of
                  the TCR Holding Participating Preferred Stock; (M) the TCR
                  Holding Participating Preferred Stock Redemption; and (N)
                  transactions between or among TCR Holding or TransContinental
                  and any of their respective Related Persons, provided such
                  transaction is approved by the Board of Directors of each of
                  the parties thereto.

         (b) Section 4.10(b) of the Original Indenture is hereby amended to read
         in its entirety as follows:

                           (b) Without limiting the foregoing, except for sales
                  of accounts receivable to an Accounts Receivable Subsidiary in
                  accordance with Section 4.20, (i) with respect to any Related
                  Person Transaction or series of Related Person Transactions
                  (other than any Related Person Transaction described in clause
                  (A) (with respect to Permitted Restricted Payments by virtue
                  of clauses (i), (ii), (iv), (vii), (ix), (x) or (xi) of the
                  proviso contained in the definition of "Restricted Payments"),
                  (C), (D), (E), (G), (J), (K), (L), (M) or (N) of Section
                  4.10(a)) with an aggregate value in excess of $5,000,000, such
                  transaction must first be approved by a majority of the Board
                  of Directors of the Company or its Subsidiary which is the
                  transacting party and a majority of the directors of such
                  entity who are disinterested in the transaction pursuant to a
                  Board Resolution, as (x) fair and reasonable to the Company or
                  such Subsidiary, as the case may be, and (y) on terms which
                  are at least as favorable as the terms which could be obtained
                  by the Company or such Subsidiary, as the case may be, on an
                  arm's length basis with Persons who are not Related Persons,
                  and (ii) with respect to any Related Person Transaction or
                  series of related Person Transactions


                                      -18-
   19



                  (other than any Related Person Transaction described in clause
                  (A) (with respect to permitted Restricted Payments by virtue
                  of clauses (i), (ii), (iv), (vii), (ix), (x) or (xi) of the
                  proviso contained in the definition of "Restricted Payments")
                  (C), (D), (E), (G), (J), (K), (L), (M) or (N) of Section
                  4.10(a)) with an aggregate value in excess of $10,000,000, the
                  Company must first obtain a favorable written opinion as to
                  the fairness of such transaction to the Company or such
                  Subsidiary, as the case may be, from a financial point of
                  view, from a nationally recognized investment banking or
                  accounting firm; provided that such opinion shall not be
                  necessary if approval of the Board of Directors to such
                  Related Person Transaction has been obtained after receipt of
                  bona fide bids of at least two other independent parties and
                  such Related Person Transaction is in the ordinary course of
                  business.

         Section 1.06. Section 4.11 of the Original Indenture. Section 4.11 of
the Original Indenture is hereby amended as follows:

         (a) The first paragraph of Section 4.11 of the Original Indenture is
         hereby amended to read in its entirety as follows:

                           Section 4.11 Limitation on Incurrences of Additional
                  Debt and Issuances of Disqualified Capital Stock.Except as set
                  forth in this Section 4.11, from and after the Issue Date, the
                  Company shall not, and shall not permit TransContinental or
                  any of the Company's Subsidiaries to, directly or indirectly,
                  create, incur, assume, guarantee, or otherwise become liable
                  for, contingently or otherwise (to "Incur" or, as appropriate,
                  an "Incurrence"), any Debt or issue any Disqualified Capital
                  Stock, except: (a) Debt evidenced by the Notes and the
                  Guarantees in an aggregate amount not to exceed $200 million
                  in proceeds to the Company less the aggregate amount of
                  proceeds to the Company pursuant to Debt incurred under clause
                  (p) below; (b) Debt evidenced by the TARC Intercompany Loan
                  and any other Debt at any time owing by any of the TARC
                  Entities to TEC in an aggregate outstanding principal amount,
                  when added to the then outstanding principal amount of the
                  TARC Intercompany Loan and any other Debt incurred pursuant to
                  this clause (b) or pursuant to clause (o) below to replace,
                  extend, renew or refund Debt incurred pursuant to this clause
                  (b), at any one time outstanding not in excess of $920 million
                  less any amount repaid pursuant to paragraph (c)(i) of the
                  covenant described herein under Section 4.14 hereof; (c)
                  Subordinated Debt of the Company solely to any wholly owned
                  Subsidiary of the Company, Debt of TCR Holding solely to
                  TransContinental or any wholly owned Subsidiary of TCR
                  Holding, Debt or Disqualified Capital Stock of TCR Holding to
                  TARC, Debt of any wholly owned Subsidiary of the Company
                  solely to the Company or to any wholly owned Subsidiary of the
                  Company or Debt of TransContinental or any wholly owned
                  Subsidiary of TCR Holding solely to TCR Holding or to any
                  wholly owned Subsidiary of TCR Holding; (d) Debt of
                  TransContinental outstanding at any time in an aggregate
                  principal amount not to exceed the greater of (x) $100 million
                  or (y) the TransContinental Borrowing Base, less, in each
                  case, the amount of any Debt of an Accounts Receivable
                  Subsidiary (other than Debt owed to the Company or
                  TransContinental); (e) Debt in an aggregate principal amount
                  not to exceed at any one time $50 million; (f) Debt secured by
                  the Storage Assets in an aggregate amount outstanding at any
                  one time not to exceed $115 million; (g) Debt secured by a
                  Permitted Lien that meets the requirements of clause (c), (g),
                  (m), (o) or (r) of the definition of "Permitted Liens," to the
                  extent that such Liens would give


                                      -19-
   20



                  rise to Debt under clauses (i), (ii), or (iii) of the
                  definition of "Debt;" (h) Any guaranty of Debt incurred
                  pursuant to clauses (d), (e), (g) or (n) hereof which guaranty
                  shall not be included in the determination of the amount of
                  Debt which may be Incurred pursuant to (d), (e), (g) or (n)
                  hereof; (i) Swap Obligations (j) Unrestricted Non-Recourse
                  Debt; (k) Debt evidenced by the TARC Mortgage Notes; (l)
                  letters of credit and reimbursement obligations relating
                  thereto to the extent collateralized by cash or Cash
                  Equivalents; (m) Debt evidenced by the TARC Discount Notes;
                  (n) Debt of the Company or any of its Subsidiaries or
                  TransContinental owed to TEC which is loaned pursuant to terms
                  of the fourth paragraph of either of the covenants contained
                  under the headings "-- Excess Cash" and "-- Additional
                  Interest Excess Cash Offer" under the TEC Indenture in the
                  aggregate not in excess of $50 million; (o) each of the
                  Company, its Subsidiaries and TransContinental may Incur Debt
                  as an extension, renewal, replacement, or refunding of any
                  item of the Debt permitted to be Incurred by clauses (b), (p),
                  (r), (v), (w) or (x) hereof, or this clause (o) (each such
                  item of Debt is referred to as "Refinancing Debt"), provided,
                  that (1) the maximum principal amount of each item of
                  Refinancing Debt (or, if such Refinancing Debt is issued with
                  original issue discount, the original issue price of such
                  Refinancing Debt) permitted under this clause (o) may not
                  exceed the lesser of (x) the principal amount of the item of
                  Debt being extended, renewed, replaced, or refunded plus
                  Refinancing Fees or (y) if such item of Debt being extended,
                  renewed, replaced, or refunded was issued at an original issue
                  discount, the original issue price, plus amortization of the
                  original issue discount as of the time of the Incurrence of
                  the Refinancing Debt plus Refinancing Fees and (2) each item
                  of Refinancing Debt shall rank with respect to the Notes to an
                  extent no less favorable in respect thereof to the Holders
                  than the related Debt being refinanced; (p) Pari Passu Debt or
                  Subordinated Debt of the Company or TCR Holding with initial
                  net proceeds to the Company not in excess of $25 million in
                  the aggregate less the aggregate amount of proceeds to the
                  Company pursuant to Debt incurred under clause (a) above after
                  the Issue Date; (q) Debt secured by Liens permitted pursuant
                  to clauses (h) and (j) of Permitted Liens, in an aggregate
                  principal amount not to exceed $35 million; (r) Debt of
                  TransContinental Incurred in connection with the acquisition,
                  construction or improvement of a CATOFIN(R) Unit not in excess
                  of 20% of TransContinental's Consolidated EBITDA accrued for
                  the period (taken as one accounting period) commencing with
                  the first full fiscal quarter that commenced after the Phase I
                  Completion Date, to and including the fiscal quarter ended
                  immediately prior to the date of such calculation, (s) Debt of
                  TARC, TCR Holding or TransContinental with an aggregate
                  principal amount outstanding at any one time of up to $225
                  million, (t) Debt of TARC (other than Debt secured by Storage
                  Assets in the initial aggregate principal amount of $36
                  million) that is assumed by TCR Holding or TransContinental in
                  connection with the Transaction, (u) Debt of TCR Holding with
                  an aggregate principal amount outstanding at any one time not
                  in excess of $200 million, (v) Debt of TCR Holding (other than
                  Debt incurred pursuant to clause (s) above) that is assumed by
                  TransContinental in connection with the Transaction, (w)
                  Disqualified Capital Stock of TCR Holding or TransContinental
                  or unsecured Debt of TCR Holding or unsecured or secured Debt
                  of TransContinental, (1) the proceeds of which are used to
                  repurchase TEC Notes or (2) that is exchanged for TEC Notes,
                  (x) Debt or Disqualified Capital Stock of TCR Holding or
                  TransContinental that is used to refinance or replace the TARC
                  Intercompany Loan and (y) Debt of the Company, TCR Holding or
                  TransContinental owed to TEC that does not in the aggregate
                  exceed $50 million principal amount outstanding at any one
                  time.



                                      -20-
   21



         (a) The third to last and second to last paragraph of Section 4.11 of
         the Original Indenture is hereby amended to read in its entirety as
         follows:

                           Notwithstanding the foregoing provisions of this
                  covenant, (a) the Company, TCR Holding and TransContinental
                  may Incur Senior Debt and the Company, TCR Holding and
                  TransContinental may issue Disqualified Capital Stock if, at
                  the time such Senior Debt is Incurred or such Disqualified
                  Capital Stock is issued, (i) no Default or Event of Default
                  shall have occurred and be continuing at the time or
                  immediately after giving effect to such transaction on a pro
                  forma basis, and (ii) immediately after giving effect to the
                  Consolidated Fixed Charges in respect of such Debt being
                  Incurred or such Disqualified Capital Stock being issued and
                  the application of the proceeds therefrom to the extent used
                  to reduce Debt or Disqualified Capital Stock, on a pro forma
                  basis, the Consolidated Fixed Charge Coverage Ratio of the
                  entity incurring such Debt for the Reference Period is greater
                  than 2.25 to 1, and (b) the Company, TCR Holding and
                  TransContinental may Incur Subordinated Debt if, at the time
                  such Subordinated Debt is incurred, (i) no Default or Event of
                  Default shall have occurred and be continuing at the time or
                  immediately after giving effect to such transaction on a pro
                  forma basis, and (ii) immediately after giving effect to the
                  Consolidated Fixed Charges in respect of such Subordinated
                  Debt being incurred and the application of the proceeds
                  therefrom to the extent used to reduce Debt, on a pro forma
                  basis, the Consolidated Fixed Charge Coverage Ratio of the
                  entity incurring such Debt for the Reference Period is greater
                  than 2.0 to 1.

                           Debt Incurred and Disqualified Capital Stock issued
                  by any Person that is not a Subsidiary of the Company, TCR
                  Holding or TransContinental, as the case may be, which Debt or
                  Disqualified Capital Stock is outstanding at the time such
                  Person becomes a Subsidiary of, or is merged into, or
                  consolidated with the Company, TCR Holding or TransContinental
                  or one of their Subsidiaries, as the case may be, shall be
                  deemed to have been Incurred or issued, as the case may be, at
                  the time such Person becomes a Subsidiary of, or is merged
                  into, or consolidated with the Company, TCR Holding or
                  TransContinental, respectively, or one of their respective
                  Subsidiaries.

         Section 1.07. Section 4.12 of the Original Indenture. Section 4.12 of
the Original Indenture is hereby amended to read in its entirety as follows:

                           Section 4.12 Limitations on Restricting Subsidiary
                  Dividends. The Company shall not, and shall not permit any of
                  its Subsidiaries (other than TCR Holding) to, directly or
                  indirectly, create, assume, or suffer to exist any consensual
                  encumbrance or restriction on the ability of any Subsidiary of
                  the Company (other than TCR Holding) to pay dividends or make
                  other distributions on the Capital Stock of any Subsidiary of
                  the Company, except encumbrances and restrictions existing
                  under this Indenture and any agreement of a Person acquired by
                  the Company or a Subsidiary of the Company, which restrictions
                  existed at the time of acquisition, were not put in place in
                  anticipation of such acquisition and are not applicable to any
                  Person or property, other than the Person or any property of
                  the Person so acquired. Notwithstanding anything contained
                  herein to the contrary, neither the Company nor TCR Holding
                  may create an encumbrance or restriction on their ability to
                  pay premium, if any, principal of, or interest on, the TARC
                  Intercompany Loan.



                                      -21-
   22



         Section 1.08. Section 4.13 of the Original Indenture. Section 4.13 of
the Original Indenture is hereby amended to read in its entirety as follows:

                           Section 4.13 Liens. The Company shall not, and shall
                  not permit any of its Subsidiaries to, directly or indirectly,
                  Incur, or suffer to exist any Lien upon any of its respective
                  property or assets, whether now owned or hereafter acquired,
                  other than Permitted Liens. Notwithstanding anything in this
                  Indenture to the contrary, (i) TARC shall not, directly or
                  indirectly, Incur or suffer to exist any Lien on the Capital
                  Stock of TCR Holding owned by it (other than a Lien to secure
                  the TARC Intercompany Loan), (ii) TCR Holding may incur a Lien
                  on Capital Stock of TransContinental to secure the TARC
                  Working Capital Loan and (iii) TransContinental shall not be
                  bound by this Section 4.13. For the purpose of determining
                  compliance with this Section 4.13, if a Lien meets the
                  criteria of more than one of the types of Permitted Liens, the
                  Company or the Subsidiary in question shall have the right to
                  determine in its sole discretion the category of Permitted
                  Lien to which such Lien applies, shall not be required to
                  include such Lien in more than one of such categories, and may
                  elect to apportion such Lien between or among any two or more
                  categories otherwise applicable.

         Section 1.09. Section 4.14 of the Original Indenture. Section 4.14 of
the Original Indenture is hereby amended to read in its entirety as follows:

                           Section 4.14 Limitation on Asset Sales. Intentionally
                  Omitted.

         Section 1.10. Section 4.18 of the Original Indenture. Section 4.18 of
the Original Indenture is hereby amended to read as follows:

                           Section 4.18 Limitations on Line of Business. The
                  Company shall not directly or indirectly engage to any
                  substantial extent in any line or lines of business activity
                  other than a Related Business and, such other business
                  activities as are reasonably related or incidental thereto.
                  The Company shall not permit TransContinental directly or
                  indirectly to engage to any substantial extent in any line or
                  lines of business activity other than a Related Business or
                  such other business activities as are reasonably related or
                  incidental thereto.

         Section 1.11. Section 4.20 of the Original Indenture. Section 4.20(a)
of the Original Indenture is hereby amended to read as follows:

                           (a) Notwithstanding the provisions of Section 4.3,
                  the Company may, and may permit any of its Subsidiaries to,
                  make Investments in an Accounts Receivable Subsidiary (i) the
                  proceeds of which are applied within five Business Days of the
                  making thereof solely to finance the purchase of accounts
                  receivable of the Company and its Subsidiaries and (ii) in the
                  form of Accounts Receivable Subsidiary Notes to the extent
                  permitted by clause (b) below; provided that the aggregate
                  amount of such Investments shall not exceed the greater of $20
                  million or 20% of the TransContinental Borrowing Base at any
                  time;

         Section 1.12. Section 4.23 of the Original Indenture. Section 4.23 of
the Original Indenture is hereby deleted.




                                      -22-
   23



         Section 1.13. Sections 4.23 and 4.24 of the Original Indenture. New
Sections 4.23 and 4.24 are hereby added to the Original Indenture to follow
Section 4.22 to read in their entirety as follows:

                           Section 4.23 Monthly Status Reports. The Company
                  shall cause TransContinental to, (A) not later than the 20th
                  day of each month (or, if such day is not a Business Day, then
                  the first Business Day following such day), commencing in
                  December 1998 and continuing through the Phase II Completion
                  Date, issue a press release (and, if applicable, file a copy
                  thereof with the SEC pursuant to a Form 8-K Current Report)
                  generally disclosing the status of completion of the Capital
                  Improvement Program through the end of the immediately
                  preceding month and (B) conduct a monthly telephone conference
                  call relating thereto with the chief executive officer of TARC
                  or his designee in which Holders will be entitled to
                  participate and provide notice by press release of the time
                  and place of such call at least 48 hours in advance thereof.

                           Section 4.24 Limitation on Issuances of Equity
                  Securities by TCR Holding or TransContinental. The Company
                  shall not permit TCR Holding, TransContinental or any
                  Subsidiary of either of them to issue (other than pursuant to
                  the Transaction, including securities issued upon conversion
                  of or in exchange for securities issued pursuant to the
                  Transaction upon the terms established in connection with the
                  Transaction, or issuances to TransContinental or any of its
                  Subsidiaries) any Capital Stock or other equity securities
                  (other than Disqualified Capital Stock that is not convertible
                  into or exchangeable for Qualified Capital Stock and other
                  equity securities that are not accounted for as equity
                  securities in accordance with GAAP) unless the issuer first
                  obtains a favorable written opinion as to the fairness of such
                  transaction to the issuer, from a financial point of view,
                  from an independent nationally recognized accounting or
                  investment banking firm.

         Section 1.14. Section 5.1 of the Original Indenture. Section 5.1 of the
Original Indenture is hereby amended to add subsection (d) to read in its
entirety as follows:

                           (d) Notwithstanding anything contained in this
                  Article V to the contrary, (i) the provisions of clause (a)
                  shall not apply to the transfer by TARC to TCR Holding of the
                  Refinery Assets as part of the Transaction, (ii) the
                  provisions of clause (a) shall not apply to the transfer to
                  TransContinental by TCR Holding of the Refinery Assets as part
                  of the Transaction and (iii) the provisions of clauses (a)(2),
                  (a)(3) and (a)(5) shall not apply to a merger of TARC with or
                  into TEC.

         Section 1.15. Section 5.2 of the Original Indenture. Section 5.2 of the
Original Indenture is hereby amended to read in its entirety as follows:

                           Section 5.2 Successor Corporation Substituted. Upon
                  any consolidation or merger, or any transfer of assets in
                  accordance with Section 5.1 (other than the transfers of the
                  Refinery Assets by the Company to TCR Holding and by TCR
                  Holding to TransContinental pursuant to the Transaction), the
                  Surviving Person formed by such consolidation or into which
                  the Company, or a Guarantor, as the case may be, is merged or
                  to which such transfer is made shall succeed to, and be
                  substituted for, and may exercise every right and power of,
                  the Company, or such Guarantor, as the case may be, under this
                  Indenture with the same effect as if such Surviving Person had
                  been named as the Company, or such




                                      -23-
   24



                  Guarantor, as the case may be, herein. When a Surviving Person
                  duly assumes all of the obligations of the Company pursuant
                  hereto and pursuant to the Notes, the predecessor shall be
                  released from such obligations.

         Section 1.16. Section 6.1 of the Original Indenture. Section 6.1(d) of
the Original Indenture is hereby amended to read in its entirety as follows:

                           (d) a default which extends beyond any stated period
                  of grace applicable thereto, including any extension thereof,
                  under any mortgage, indenture or instrument under which there
                  is outstanding any Debt of the Company, any of its
                  Subsidiaries or TransContinental with an aggregate principal
                  amount in excess of $20,000,000 if by reason of such default
                  the principal of such Debt and all accrued and unpaid interest
                  thereon has been declared due and payable, or failure to pay
                  such Debt at its stated maturity, if either (a) such default
                  results from the failure to pay principal of, premium, if any,
                  or interest on any such Debt when due and such default
                  continues beyond any applicable cure, forebearance or notice
                  period; provided that a waiver by the lenders of such Debt of
                  such default shall constitute a waiver hereunder for the same
                  period or (b) as a result of such default, the maturity of
                  such Debt has been accelerated prior to its scheduled
                  maturity, and such default or acceleration continues for a
                  period of 10 days; provided, that a rescission or annulment of
                  such default or acceleration (prior to any action taken by the
                  Trustee with respect to the acceleration of the Obligations
                  under the Notes) pursuant to the agreement governing such Debt
                  shall constitute a waiver hereunder for the same period.

         Section 1.17. Section 9.1 of the Original Indenture. Section 9.1 of the
Original Indenture is hereby amended to read in its entirety as follows:

                           Section 9.1 Supplemental Indentures Without Consent
                  of Holders. Without the consent of any Holder, the Company and
                  the Guarantors, if any, when authorized by Board Resolutions,
                  and the Trustee, at any time and from time to time, may enter
                  into one or more indentures supplemental hereto or a
                  restatement hereof in form satisfactory to the Trustee, for
                  any of the following purposes:

                           (a) to cure any ambiguity, defect, or inconsistency,
                  or to make any other provisions with respect to matters or
                  questions arising under this Indenture which shall not be
                  inconsistent with the provisions of this Indenture, provided
                  such action pursuant to this clause (a) shall not adversely
                  affect the interests of any Holder in any respect;

                           (b) to add to the covenants of the Company for the
                  benefit of the Holders or to surrender any right or power
                  herein conferred upon the Company or to make any other change
                  that does not adversely affect the rights of any Holder,
                  provided that the Company has delivered to the Trustee an
                  Opinion of Counsel stating that such change does not adversely
                  affect the rights of any Holder;

                           (c) to evidence the succession of another Person to
                  the Company and the assumption by any such successor of the
                  obligations of the Company herein and in the Notes in
                  accordance with Article V;





                                      -24-
   25



                           (d)  to comply with the TIA; or

                           (e) to restate this Indenture so that it reflects
                  this Indenture as originally executed as amended by all
                  amendments and supplements hereto through the date of such
                  restatement and contains only the then effective provisions of
                  this Indenture.

         Section 1.18. Section 9.6 of the Original Indenture. Section 9.6 of the
Original Indenture is hereby amended to read in its entirety as follows:

                           Section 9.6 Trustee to Sign Amendments, Etc. The
                  Trustee shall execute any amendment, supplement, restatement
                  or waiver authorized pursuant to this Article IX, provided
                  that the Trustee may, but shall not be obligated to, execute
                  any such amendment, supplement, restatement or waiver which
                  affects the Trustee's own rights, duties or immunities under
                  this Indenture. The Trustee at the expense of the Company
                  shall be entitled to receive, and shall be fully protected in
                  relying upon, an Opinion of Counsel stating that the execution
                  of any amendment, supplement, restatement or waiver authorized
                  pursuant to this Article IX is authorized or permitted by this
                  Indenture.

         Section 1.19. Article XI of the Original Indenture. Article XI of the
Original Indenture is hereby amended to read in its entirety as follows:

                                   ARTICLE XI

                           RIGHT TO REQUIRE REPURCHASE

                              INTENTIONALLY OMITTED


                                   ARTICLE II
                               GENERAL PROVISIONS

         Section 2.01. Effectiveness of Amendments. This Supplemental Indenture
is effective as of the date first above written. However, the provisions of the
Original Indenture amended or eliminated as provided in this Supplemental
Indenture (the "Amended Provisions") shall remain operative in the form in which
they exist in the Original Indenture until the Transaction Closing Date,
whereupon the Amended Provisions will be amended or eliminated as provided
herein, effective immediately prior to the Transaction Closing Date.

         Section 2.02. Ratification of Indenture. The Original Indenture is in
all respects acknowledged, ratified and confirmed, and shall continue in full
force and effect in accordance with the terms thereof and as supplemented by
this Supplemental Indenture. The Original Indenture and this Supplemental
Indenture, shall be read, taken and construed as one and the same instrument.

         Section 2.03. Certificate and Opinion as to Conditions Precedent.
Simultaneously with and as a condition to the execution of this Supplemental
Indenture, the Company is delivering to the Trustee:

                  (a) an Officers' Certificate in the form attached hereto as
Exhibit A; and



                                      -25-
   26

                  (b) an Opinion of Counsel covering the matters described in
Exhibit B attached hereto.

         Section 2.04. Effect of Headings. The Article and Section headings in
this Supplemental Indenture are for convenience only and shall not affect the
construction of this Supplemental Indenture.

         Section 2.05. Governing Law. THIS SUPPLEMENTAL INDENTURE SHALL BE
CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF NEW YORK,
AS APPLIED TO CONTRACTS MADE AND PERFORMED WITHIN THE STATE OF NEW YORK, WITHOUT
REGARD TO PRINCIPLES OF CONFLICTS OF LAW.

         Section 2.06. Counterparts. This Supplemental Indenture may be executed
in any number if counterparts, each of which so executed shall be deemed to be
an original, but all such counterparts shall together constitute the same
instrument.




                                      -26-
   27


         IN WITNESS WHEREOF, the parties to this Supplemental Indenture have
caused the Supplemental Indenture to be duly executed, and their respective
corporate seals to be hereunto affixed and attached, on and effective as of day
and year first above written.




                                        TRANSAMERICAN REFINING CORPORATION,
                                                 A Texas corporation



Attest:                                 By:
       --------------------------          ------------------------------------
         Ann F. Gullion,                             Name: Ed Donahue
         Assistant Secretary               Title: Vice President and Secretary



                                        FIRST UNION NATIONAL BANK,
                                                 As Trustee



                                                 By:
                                                    ---------------------------
                                                    Name:
                                                    Title:






                                      -27-