Document:

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                                                                    EXHIBIT 4.47

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                           TRANSTEXAS GAS CORPORATION,
                                     Issuer,

                      GALVESTON BAY PROCESSING CORPORATION
                                       and
                         GALVESTON BAY PIPELINE COMPANY,
                                   Guarantors,

                                       and

                               FIRSTAR BANK, N.A.,
                                     Trustee

                                   ----------

                          FIRST SUPPLEMENTAL INDENTURE

                            Dated as of June 28, 2000

                                   ----------

                                  $200,000,000
                        15% Senior Secured Notes due 2005

================================================================================

<PAGE>   2

         THIS FIRST SUPPLEMENTAL INDENTURE, dated as of June 28, 2000, but
retroactive to, and effective as of, March 15, 2000 (the "First Supplemental
Indenture"), is made and entered into by and among TRANSTEXAS GAS CORPORATION, a
Delaware corporation (the "Company"), GALVESTON BAY PROCESSING CORPORATION, a
Delaware corporation ("Processing"), and GALVESTON BAY PIPELINE COMPANY, a
Delaware corporation ("Pipeline," and, together with Processing, the "Initial
Guarantors"), and FIRSTAR BANK, N.A., as trustee (the "Trustee"), under an
Indenture dated as of March 15, 2000, between the Company, as issuer, and the
Trustee, as trustee, and joined in by the Initial Guarantors as Guarantors (the
"Original Indenture"). All capitalized terms used in this First Supplemental
Indenture that are defined in the Original Indenture, either directly or by
reference therein, have the meanings assigned to them therein, except to the
extent such terms are defined in this First Supplemental Indenture or the
context clearly requires otherwise.

         WHEREAS, the Initial Guarantors are parties to the Indenture, each
having joined in the execution thereof for the purposes of evidencing its
Guarantee and of agreeing to be bound by the terms of this Indenture, as
expressly set forth in the definition of the term "Guarantor" set forth in
Section 1.1 of the Original Indenture; and

         WHEREAS, Section 9.1 of the Original Indenture provides, among other
things, that the Company (when authorized by Board Resolutions) and the Trustee
may, at any time and from time to time, without the necessity for consent of any
Holder, enter into one or more indenture supplements, in form satisfactory to
the Trustee, to cure any ambiguity, defect, or inconsistency, or to make other
provisions with respect to matters or questions arising under the provisions of
the Indenture, provided that such action shall not adversely affect the
interests of any Holder in any respect; and

         WHEREAS, the Board of Directors of the Company has adopted resolutions
authorizing and approving the amendment of Section 12.1(a) of the Indenture for
the purpose of curing an ambiguity, defect or inconsistency therein, as more
particularly described in this First Supplemental Indenture, and the Company,
the Initial Guarantors and the Trustee are executing and delivering this First
Supplemental Indenture in order to provide for such amendment and to confirm the
obligations of the Initial Guarantors as Guarantors under the Indenture; and

         WHEREAS, the Company, the Initial Guarantors and the Trustee have
determined that the amendments described below do not adversely affect the
interests of any Holder in any respect;

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

                                    ARTICLE I

                         AMENDMENT TO ORIGINAL INDENTURE

         Section 1.1 Amendment to Section 12.1(a). Section 12.1(a) of the
Original Indenture is hereby amended by deleting from the phrase "each
Subsidiary of the Company joining in the execution of this Indenture and the
Notes for the purpose of evidencing its Guarantee and its agreement to be bound
by the terms of this Indenture" appearing in the first sentence thereof the
phrase "and the Notes" such that Section 12.1(a) of the Original Indenture, as
so amended, is restated in its entirety to read as follows:

                    (a) In consideration of good and valuable consideration, the
                receipt and sufficiency of which is hereby acknowledged, each
                Subsidiary

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                  of the Company joining in the execution of this Indenture for
                  the purpose of evidencing its Guarantee and its agreement to
                  be bound by the terms of this Indenture, and each Subsidiary
                  of the Company that becomes a Guarantor in accordance with
                  Section 4.16 and/or that executes a supplemental indenture in
                  which such Subsidiary agrees to become and be a Guarantor and
                  to be bound by the terms of this Indenture, jointly and
                  severally, hereby unconditionally guarantees to each Holder of
                  a Note authenticated and delivered by the Trustee and to the
                  Trustee, irrespective of the validity or enforceability of
                  this Indenture, the Notes or the obligations of the Company
                  under this Indenture or the Notes, that: (i) the principal of
                  and interest (and premium, if any) on the Notes will be paid
                  in full when due, whether at the maturity or interest payment
                  date, on any Change of Control Payment Date, by acceleration,
                  call for redemption, purchase or otherwise, and interest on
                  the overdue principal and interest, if any, of the Notes, if
                  lawful, and all other obligations of the Company to the
                  Holders or the Trustee under this Indenture or the Notes will
                  be promptly paid in full or performed, all in accordance with
                  the terms of this Indenture and the Notes, and (ii) in case of
                  any extension of time of pay ment or renewal of any Notes or
                  any of such other obligations, they will be paid in full when
                  due or performed in accordance with the terms of the extension
                  or renewal, whether at maturity, on any Change of Control
                  Payment Date, by acceleration, call for redemption, purchase
                  or otherwise (such guarantees being the "Guarantee"). The
                  Guarantee is a guarantee of payment and not of collection.

                        Failing payment when due of any amount so guaranteed for
                  whatever reason, the Guarantors shall be jointly and severally
                  obligated to pay the same whether or not the failure to so pay
                  is or becomes an Event of Default.

                                   ARTICLE II

               CONFIRMATION AND RATIFICATION OF INITIAL GUARANTORS

         Section 2.1 Confirmation of Joinder. Each of the Initial Guarantors
acknowledges and agrees that it joined in the execution of the Original
Indenture for the purposes of evidencing its Guarantee and of agreeing to be
bound by the terms of the Original Indenture, as amended or supplemented from
time to time in accordance with the terms thereof and that it is joining in the
execution of this First Supplemental Indenture for the purposes of (a) ratifying
and confirming such Guarantee and such agreement to be so bound and (b)
evidencing its consent to the execution and delivery of, and to the amendment to
Section 12.1(a) of the Original Indenture effected pursuant to Section 1.1 of,
this First Supplemental Indenture.

         Section 2.2 Ratification of Indenture. Each of the Initial Guarantors
agrees that its Guarantee under the Original Indenture is in all respects
acknowledged, ratified and confirmed, and, notwithstanding the execution and
delivery of this First Supplemental Indenture, and after giving effect to such
execution

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and delivery, is and shall remain and continue in full force and effect in
accordance with the terms of the Original Indenture, as supplemented by this
First Supplemental Indenture.

                                   ARTICLE II

                               GENERAL PROVISIONS

         Section 2.01. 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 First Supplemental Indenture. The Original Indenture and this First
Supplemental Indenture shall be read, taken and construed as one and the same
instrument.

         Section 2.02. Effect of Headings. The Article and Section headings in
this First Supplemental Indenture are for convenience only and shall not affect
the construction of this First Supplemental Indenture.

         Section 2.03. Severability. In case any one or more of the provisions
in this First Supplemental Indenture shall be held invalid, illegal or
unenforceable, in any respect for any reason, the validity, legality and
enforceability of any such provision in every other respect and of the remaining
provisions shall not in any way be affected or impaired thereby, it being
intended that all of the provisions hereof shall be enforceable to the full
extent permitted by law.

         Section 2.04. Governing Law. THIS FIRST SUPPLEMENTAL INDENTURE SHALL BE
CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF NEW YORK.

         Section 2.05. Counterparts. This First Supplemental Indenture may be
executed in any number of counterparts, each of which so executed shall be
deemed to be an original, but all such counterparts shall together constitute
the same instrument.

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                 SIGNATURES APPEAR ON THE NEXT-FOLLOWING PAGES]

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                                   SIGNATURES

         IN WITNESS WHEREOF, the parties to this First Supplemental Indenture
have caused this First Supplemental Indenture to be duly executed as of June 28,
2000, but to be effective as of and retroactive to March 15, 2000.

                                     TRANSTEXAS GAS CORPORATION

                                     By: /s/ ED DONAHUE
                                        ---------------------------------------
                                     Name:  Ed Donahue
                                     Title: Vice President and Chief
                                            Financial Officer

Attest: /s/ DAVID R. JENNINGS
       ----------------------
Name:  David R. Jennings
Title: Assistant Secretary

                                  SIGNATURE PAGE TO FIRST SUPPLEMENTAL INDENTURE

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                                            GALVESTON BAY PROCESSING CORPORATION

                                            By: /s/ ED DONAHUE
                                               ---------------------------------
                                            Name:  Ed Donahue
                                            Title: Vice President

Attest: /s/ DAVID R. JENNINGS
      -----------------------
Name:  David R. Jennings
Title: Assistant Secretary

                                  SIGNATURE PAGE TO FIRST SUPPLEMENTAL INDENTURE

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                                          GALVESTON BAY PIPELINE COMPANY

                                          By: /s/ ED DONAHUE
                                             -----------------------------------
                                          Name:  Ed Donahue
                                          Title: Vice President

Attest: /s/ DAVID R. JENNINGS
       ----------------------
Name:  David R. Jennings
Title: Assistant Secretary

                                  SIGNATURE PAGE TO FIRST SUPPLEMENTAL INDENTURE

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                                       FIRSTAR BANK, N.A.,
                                         as Trustee

                                       By: /s/ FRANK P. LESLIE III
                                          --------------------------------------
                                       Name:  Frank P. Leslie III
                                       Title: Vice President

                                 SIGNATURE PAGE TO FIRST SUPPLEMENTAL INDENTURE<PAGE>   1
                                                                   EXHIBIT 10.59

                     FIRST SUPPLEMENT TO PURCHASE AGREEMENT

         THIS FIRST SUPPLEMENT TO PURCHASE AGREEMENT dated as of June 7, 2000
(this "Supplement"), is made by:

          o    TransTexas Gas Corporation, a Delaware corporation (herein called
               "Grantor"),

          o    Southern Producer Services, L.P. ("SPS"),

          o    TCW Portfolio No. 1555 DR V Sub-Custody Partnership, L.P. ("Fund
               V") and TCW DR VI Investment Partnership, L.P. ("Fund VI"),
               acting through their agent, TCW Asset Management Company, and

          o    TCW Asset Management Company, as Agent on behalf of Fund V and
               Fund VI (in such capacity, "Funds Agent").

                                    RECITALS

         1. Grantor, SPS, Fund V, Fund VI and Funds Agent have heretofore
entered into that certain Purchase Agreement dated as of March 14, 2000 (herein,
as heretofore amended or supplemented, called the "Original Purchase
Agreement"), and, as contemplated therein, Grantor has, by means of a Production
Payment Conveyance dated as of the same date (herein, as heretofore amended or
supplemented, called the "Original Conveyance"), conveyed to SPS, Fund V and
Fund VI (collectively, "Grantee") the "Production Payment" as therein defined,
burdening interests of Grantor in certain oil and gas properties.

         2. As contemplated in the Original Purchase Agreement, Grantor now
desires to supplement and amend the Original Conveyance in consideration of the
payment by SPS of an additional Purchase Price Payment, as more fully described
below.

         3. Section 2.3(a) of the Original Purchase Agreement provides that SPS
will pay an additional Purchase Price Payment to Grantor with respect to each
State Tract 5/6 Offset Well upon the terms set forth therein in an amount equal
to the lesser of (i) the Drilling Costs relating to such State Tract 5/6 Offset
Well and (ii) $4,500,000, provided that Grantee and Grantor may in their
discretion agree to a higher Purchase Price Payment.

         NOW, THEREFORE, in consideration of the premises and the mutual
covenants and agreements contained herein, Grantor, SPS, Fund V, Fund VI, and
Funds Agent hereby agree as follows:

                     ARTICLE I - Definitions and References

         Section 1.1. Defined Terms and References. As used herein, the terms
"Original Conveyance", "Original Purchase Agreement", "Grantor", "SPS", "Fund
V", "Fund VI",

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"Grantee" and "Funds Agent" have the meanings given them above. Reference is
also made to the Original Purchase Agreement and to the Original Conveyance for
the meaning of various terms defined therein, all of which shall when used
herein (unless otherwise expressly defined herein) have the same meanings. For
purposes of this Supplement, unless the context otherwise requires, the
following additional terms shall have the following meanings:

         "Current Closing Date" has the meaning given such term in Section 2.3.

         "Current Conveyance Supplement" means the First Supplement to
Production Payment Conveyance executed by Grantor and Grantee substantially in
the form of Exhibit A hereto.

         "Current Purchase Price Payment" means a Purchase Price Payment in the
amount of $8,000,000 for the first State Tract 5/6 Offset Well, which represents
a higher Purchase Price Payment agreed to by Grantee and Grantor in their
discretion pursuant to Section 2.3(a) of the Purchase Agreement.

         "Current Supplement Documents" means this Supplement, the Current
Conveyance Supplement, and all other Production Payment Documents delivered
substantially contemporaneously herewith.

         "Production Payment Conveyance" means the Original Conveyance as
amended and supplemented by the Current Conveyance Supplement.

         "Purchase Agreement" means the Original Purchase Agreement as
supplemented and amended hereby.

         Section 1.2. Rules of Construction. All references in this Supplement
to articles, sections, subsections and other subdivisions refer to corresponding
articles, sections, subsections and other subdivisions of this Supplement unless
expressly provided otherwise. Titles appearing at the beginning of any of such
subdivisions are for convenience only and shall not constitute part of such
subdivisions and shall be disregarded in construing the language contained in
such subdivisions. The words "this Supplement, "this instrument", "herein",
"hereof", "hereby", "hereunder" and words of similar import refer to this
Supplement as a whole and not to any particular subdivision unless expressly so
limited. Unless the context otherwise requires: "including" (and its grammatical
variations) means "including without limitation"; "or" is not exclusive; words
in the singular form shall be construed to include the plural and vice versa;
words in any gender include all other genders; references herein to any
instrument or agreement refer to such instrument or agreement as it may be from
time to time supplemented or amended; and references herein to any Person
include such Person's successors and assigns. All references in this Supplement
to exhibits and schedules refer to the exhibits and schedules to this Supplement
unless expressly provided otherwise, and all such exhibits and schedules are
hereby incorporated herein by reference and made a part hereof for all purposes.

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                             ARTICLE II - Amendment

         Section 2.1. Agreement to Amend. Upon the terms and conditions of this
Supplement and the Purchase Agreement, Grantor and Grantee agree to amend and
supplement the Original Conveyance by executing and delivering the Current
Conveyance Supplement.

         Section 2.2. Closing. On the Current Closing Date, Grantor shall
deliver the Current Conveyance Supplement to Grantee, Grantor shall satisfy all
of the conditions set out in Sections 3.4 and 3.5 of the Purchase Agreement, and
the following additional condition shall be satisfied:

         o        Grantor shall provide Grantee with certified copies of
                  Grantor's filing of the Notice of Filing of Production Payment
                  Documents with the Bankruptcy Court as contemplated in
                  paragraph 8 of the Bankruptcy Court Order.

Thereupon, SPS shall pay all of the Current Purchase Price Payment to Grantor in
accordance with the terms and procedures of the Purchase Agreement.

         Section 2.3. Time and Place of Closing. The closing for the
consummation of the transactions contemplated herein shall take place on June 7,
2000 or on such other date as may be agreed to by Grantor and Grantee (herein
called the "Current Closing Date").

         Section 2.4. Payment of Drilling Costs and Expenses. Section 2.3 of the
Purchase Agreement states that the obligation of SPS to pay the Current Purchase
Price Payment to Grantor is subject to the condition precedent that Grantor
first provides evidence acceptable to SPS (in the reasonable exercise of SPS's
discretion) that Grantor has paid in full in cash all costs and expenses
associated with drilling the first State Tract 5/6 Offset Well or has made
provision for such payment that is satisfactory to SPS (in the reasonable
exercise of SPS's discretion) (the "Condition"). Grantee hereby waives, with
respect to the first State Tract 5/6 Offset Well only, the Condition.

                   ARTICLE III - Representations and Covenants

         Section 3.1. Representations and Warranties of Grantor. To induce
Grantee to enter into the Current Supplement Documents and to pay the Current
Purchase Price Payment, Grantor hereby represents and warrants and covenants to
Grantee that:

         (a) All representations and warranties made by Grantor or any other
TransTexas Company in any Production Payment Document now or previously
delivered are true and correct as of the Current Closing Date (unless such
representations and warranties are expressly limited to an earlier date, in
which case such representations and warranties are true and correct as of such
earlier date). Without limitation of the foregoing, no Senior Notes Event of
Default exists.

         (b) Each TransTexas Company has performed all agreements, covenants,
and conditions which it is required by any Production Payment Document to
perform on or prior to the Current Closing Date.

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         (c) The consummation on the Current Closing Date of the transactions
contemplated in the Current Supplement Documents: (i) is not prohibited by any
law or any regulation or order of any court or governmental agency or authority
applicable to Grantor or any other TransTexas Company, and (ii) does not subject
any of them to any penalty or other onerous condition under or pursuant to any
such law, regulation or order.

         (d) The State Tract 331 #5 well is the first State Tract 5/6 Offset
Well to be drilled.

         Section 3.2. Covenants. To induce Grantee to enter into the Current
Supplement Documents and to pay the Current Purchase Price Payment, Grantor
hereby covenants with Grantee that Grantor will perform all of its covenants and
duties under the Production Payment Documents, all as fully as if they were set
out in full herein.

         Section 3.3. Representations and Warranties of Grantee. Each Person
included within Grantee hereby represents and warrants to Grantor that: (a) such
Person has incurred no obligation or liability, contingent or otherwise, for
broker's or finder's fees in respect of any of the matters provided for in this
Supplement for which fees Grantor might be liable; (b) the Purchase Agreement
constitutes the legal, valid and binding act and obligation of such Person,
enforceable against such Person in accordance with its terms except as such
enforcement may be limited by bankruptcy, insolvency, moratorium and other
similar laws applicable to creditors' rights generally or by general principles
of equity; (c) no bankruptcy or insolvency proceeding is presently pending (or,
to such Person's best knowledge, threatened) by or against such Person under any
applicable bankruptcy, insolvency or other similar law of any jurisdiction; (d)
such Person has not made a general assignment for the benefit of creditors; (e)
such Person is acquiring the Production Payment for its own account and not with
any intention to transfer all or any part of the Production Payment to others in
violation of the Securities Act of 1933, as amended, or any other applicable
securities laws, and (f) such Person is a "United States person", within the
meaning of Section 7701 of the Internal Revenue Code of 1986, as amended. Fund V
and Fund VI further represent and warrant that in connection with the
transactions contemplated herein and in the Purchase Agreement (i) they are
represented by Funds Agent, an investment manager that qualifies as a "qualified
professional asset manager" as defined in Department of Labor Prohibited
Transaction Exemption 84-14 (the "QPAM Exemption") and (ii) each of the
conditions of the QPAM Exemption are satisfied and will, throughout the term of
the Purchase Agreement (as hereby supplemented and amended), be satisfied.

         Section 3.4. Sales Agreements. Each of the parties hereto acknowledges
and agrees that the State Tract 331 #5 well is a Subject Well and that such
well, and the production therefrom, are subject to the Production Payment
Documents. In particular, each of the parties hereto acknowledges and agrees
that the State Tract 331 #5 well is subject to the provisions of the Production
Sales Agreement and the TransTexas Marketing Agreements that relate to
properties located in Galveston Bay and agrees (at the request of any party
hereto) to execute and deliver any amendments or supplements thereto in order to
further evidence the same.

                                        4

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                           ARTICLE IV - Miscellaneous

         Section 4.1. Ratification of Production Payment Documents. The Original
Purchase Agreement as hereby supplemented and amended is hereby ratified and
confirmed in all respects. The other Production Payments Documents, as they may
be supplemented, amended or affected by the Current Supplement Documents, are
hereby ratified and confirmed in all respects. Any reference to the Purchase
Agreement in any Production Payment Document shall be deemed to refer to this
Supplement also, and any reference in any Production Payment Document to any
other document or instrument amended, renewed, extended or otherwise affected by
any Current Supplement Document shall also refer to such Current Supplement
Document. The execution, delivery and effectiveness of this Supplement and the
other Current Supplement Documents shall not, except as expressly provided
herein or therein, operate as a waiver of any right, power or remedy of Grantee
or Funds Agent under the Purchase Agreement or any other Production Payment
Document nor constitute a waiver of any provision of the Purchase Agreement or
any other Production Payment Document.

         Section 4.2. Survival of Agreements. All representations, warranties,
covenants and agreements of Grantor herein shall survive the execution and
delivery of this Supplement and the other Current Supplement Documents and shall
further survive until terminated in accordance with the Purchase Agreement.

         Section 4.3. Production Payment Documents. This Supplement and the
other Current Supplement Documents are Production Payment Documents, and all
provisions in the Purchase Agreement pertaining to Production Payment Documents
(including the arbitration provisions of Section 6.9 of the Purchase Agreement)
apply hereto and thereto.

         THIS WRITTEN AGREEMENT AND THE OTHER PRODUCTION PAYMENT DOCUMENTS
REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY
EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OF THE
PARTIES.

         THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

         Section 4.4. Governing Law. This Supplement shall be deemed a contract
and instrument made under the laws of the State of Texas and shall be construed
and enforced in accordance with and governed by the laws of the State of Texas
and the laws of the United States of America, without regard to principles of
conflicts of law.

         Section 4.5. Counterparts. This Supplement may be separately executed
in counterparts and by the different parties hereto in separate counterparts,
each of which when so executed shall be deemed to constitute one and the same
Supplement.

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         IN WITNESS WHEREOF, this Supplement is executed as of the date first
written above.

                                   TRANSTEXAS GAS CORPORATION

                                   By:  /s/ ED DONAHUE
                                       -------------------------------
                                       Ed Donahue
                                       Vice President

                                   SOUTHERN PRODUCER SERVICES, L.P.

                                   BY: SC Ashwood Holdings, Inc.,
                                       its general partner

                                       By:  /s/ DAVID W. STEWART
                                           ---------------------------
                                           David W. Stewart
                                           Vice President

                                   TCW PORTFOLIO NO. 1555 DR V SUB-CUSTODY
                                   PARTNERSHIP, L.P. and
                                   TCW DR VI INVESTMENT PARTNERSHIP, L.P.

                                   By: TCW ASSET MANAGEMENT COMPANY, as
                                       their Agent

                                       By:  /s/ KURT A. TALBOT
                                           ---------------------------
                                           Kurt A. Talbot
                                           Senior Vice President

                                   TCW ASSET MANAGEMENT COMPANY, as Agent

                                   By:  /s/ KURT A. TALBOT
                                       -------------------------------
                                       Kurt A. Talbot
                                       Senior Vice President

                                        6

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                                 ACKNOWLEDGMENT

         To induce Grantee to enter into the above Supplement, the undersigned
Galveston Bay Pipeline Company and Galveston Bay Processing Company each hereby
ratify and confirm their various agreements made in connection with the
Production Payment Documents referred to above and acknowledge and agree that
such agreements remain in full force and effect after taking into account the
Current Supplement Documents referred to above.

EXECUTED as of June 7, 2000.

GALVESTON BAY PIPELINE COMPANY

By: /s/ ED DONAHUE
   ----------------------------
   Name:  Ed Donahue
   Title: Vice President

GALVESTON BAY PROCESSING COMPANY

By: /s/ ED DONAHUE
   ----------------------------
   Name:  Ed Donahue
   Title: Vice President

                                        7

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                                                                       EXHIBIT A

                          CURRENT CONVEYANCE SUPPLEMENT

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