Document:

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                                                                   Exhibit 10.25

                            LETTER AMENDMENT NO. 5
                                      TO
              SECOND AMENDED AND RESTATED MASTER SHELF AGREEMENT

                                March 30, 2001

The Prudential Insurance Company
 of America
Pruco Life Insurance Company
c/o Prudential Capital Group
2200 Ross Avenue, Suite 4200E
Dallas, Texas 75201

Ladies and Gentlemen:

          We refer to the Second Amended and Restated Master Shelf Agreement
dated as of December 19, 1991 (effective January 31, 1996), as amended by Letter
Amendment No. 1 dated November 21, 1997, Letter Amendment No. 2 dated March 31,
1999, Limited Waiver, Consent, Release and Amendment No. 3 dated June 1, 1999
and Limited Waiver, Consent, Release and Amendment No. 4 dated August 25, 2000
(as amended, the "Agreement") among the undersigned, Western Gas Resources, Inc.
(the "Company") and you.  Unless otherwise defined herein, the terms defined in
the Agreement shall be used herein as therein defined.

          It is hereby agreed by you and us as follows:

          The Agreement is, effective the date first above written, hereby
amended as follows:

          (a) Paragraph 6C(3).  Limitation on Investments and New Businesses.
     Clause (iii) of paragraph 6C(3) of the Agreement is amended in full to read
     as follows:

               "(iii) make any acquisitions of, capital contributions to, or
          other investments in, any Persons which exceed in the aggregate
          $500,000 other than (a) capital contributions to and investments in
          any joint venture described in Schedule 6C(3) or in the Wholly Owned
          Subsidiaries, (b) acquisitions of equity in corporations or
          partnerships having as their primary business gas processing,
          transmission and gathering, oil and gas production and storage or gas
          marketing and related activities or electric power generation or
          marketing which do not exceed in the aggregate 10%of Consolidated Net
          Tangible Assets, (c) deposits with, investments in obligations of and
          time deposits in any domestic bank or domestic branches of foreign
          banks which, at the time such deposit or investment is made, are rated
          A or better by Standard & Poor's Rating Group or Moody's Investor
          Service, Inc. or B or better by Thomson Bank Watch, Inc. and
          investments maturing within one year from the date of acquisition in
<PAGE>

          direct obligations of or obligations supported by, the full faith and
          credit of, the United States of America and (d) purchases of open
          market commercial paper, maturing within 270 days after acquisition
          thereof, with the highest or second highest credit rating given by
          either Standard & Poor's Rating Services (a division of The McGraw-
          Hill Companies, Inc.) or Moody's Investors Service, Inc. and
          investments in money market mutual funds with equivalent ratings or"

          On and after the effective date of this Letter Amendment, each
reference in the Agreement to "this Agreement", "hereunder", "hereof", or words
of like import referring to the Agreement, and each reference in the Notes to
"the Agreement", "thereunder", "thereof", or words of like import referring to
the Agreement, shall mean the Agreement as amended by this Letter Amendment.
The Agreement, as amended by this Letter Amendment, is and shall continue to be
in full force and effect and is hereby in all respects ratified and confirmed.
The execution, delivery and effectiveness of this Letter Amendment shall not,
except as expressly provided herein, operate as a waiver of any right, power or
remedy under the Agreement nor constitute a waiver of any provision of the
Agreement.

          This Letter Amendment may be executed in any number of counterparts
and by any combination of the parties hereto in separate counterparts, each of
which counterparts shall be an original and all of which taken together shall
constitute one and the same Letter Amendment.

          If you agree to the terms and provisions hereof, please evidence your
agreement by executing and returning at least a counterpart of this Letter
Amendment to the Company at its address at 12200 N. Pecos Street, Denver, CO
80234, Attention of Vice President-Finance. This Letter Amendment shall become
effective as of the date first above written when and if counterparts of this
Letter Amendment shall have been executed by us and you and the consent attached
hereto shall have been executed by the Guarantors.

                                   Very truly yours,

                                    WESTERN GAS RESOURCES, INC.

                                    By:______________________________
                                       Title:

Agreed as of the date first above written:

THE PRUDENTIAL INSURANCE COMPANY
 OF AMERICA

By:______________________________
   Vice President

PRUCO LIFE INSURANCE COMPANY

By:______________________________
   Vice President

                                      -2-
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                                    CONSENT

          Each of the undersigned is a Guarantor ("Guarantor" and, collectively
"Guarantors") under separate guaranties (each being a "Guaranty") in favor of
The Prudential Insurance Company of America and Pruco Life Insurance Company
(together, "Prudential") with respect to the obligations of Western Gas
Resources, Inc. (the "Company") under that certain Second Amended and Restated
Master Shelf Agreement dated as of December 19, 1991 (effective January 31,
1996) as amended by Letter Amendment No. 1 dated November 21, 1997, Letter
Amendment No. 2 dated March 31, 1999, Limited Waiver, Consent, Release and
Amendment No. 3 dated June 1, 1999 and Limited Waiver, Consent, Release and
Amendment No. 4 dated August 25, 2000 (as amended, the "Agreement").  Prudential
and the Company are entering into that certain Letter Amendment No. 5 to Second
Amended and Restated Master Shelf Agreement, dated as of March 30, 2001 (the
"Amendment").  Each of the undersigned hereby consents to the Amendment and each
hereby confirms and agrees that its Guaranty is, and shall continue to be, in
full force and effect and is hereby confirmed and ratified in all respects
except that, upon the effectiveness of, and on and after the date of this
consent, all words of like import referring to the Agreement shall mean the
Agreement as amended by the Amendment, as the same may be further amended or
modified from time to time.

     Dated as of March 30, 2001

LANCE OIL & GAS COMPANY, INC.
MGTC, INC.
MIGC, INC.
MOUNTAIN GAS RESOURCES, INC.
WESTERN GAS RESOURCES - TEXAS, INC.
WESTERN GAS WYOMING, L.L.C.

By:___________________________________________
     William J. Krysiak, as Vice President -
     Finance of each of the above-named companies.<PAGE>

                                                                   Exhibit 10.26

                            INTERCREDITOR AGREEMENT
                            -----------------------

     This INTERCREDITOR AGREEMENT (as amended from time to time, herein called
this "Agreement"), is entered into by and among the Lenders (as such term is
defined in the Bank Revolver Agreement) (herein sometimes called the "Revolver
Banks"), BANK OF AMERICA, N.A., successor in interest to NATIONSBANK, N.A., as
Agent for the Revolver Banks (the "Agent"), and THE PRUDENTIAL INSURANCE COMPANY
OF AMERICA, a New Jersey corporation, for itself and on behalf of any
corporation or other entity (a "Prudential Affiliate"), all of the voting
securities or interest of which is owned by The Prudential Insurance Company of
America (herein sometimes collectively called "Prudential"; the Revolver Banks,
the Agent, and Prudential are herein sometimes collectively called the "Lenders"
and individually called a "Lender").

                             W I T N E S S E T H:

     WHEREAS, WESTERN GAS RESOURCES, INC., a Delaware corporation (herein called
the "Company"), the Revolver Banks and the Agent have entered into that certain
Loan Agreement dated as of April 29, 1999 (herein, as from time to time amended,
supplemented or restated, called the "Bank Revolver Agreement"), pursuant to
which, among other things, the Revolver Banks have agreed to make certain loans
to the Company and the Company has executed in favor of each Revolver Bank a
promissory note (such promissory notes, as from time to time supplemented or
amended and all promissory notes given in renewal and extension thereof are
collectively referred to herein as the "Revolver Notes");

     WHEREAS, the Company and one or more of the Revolver Banks or Prudential
may, from time to time, enter into interest rate swap agreements with respect to
various obligations of the Company (herein, as hereafter executed and amended
from time to time, collectively called the "Swap Agreements");

     WHEREAS, payment of certain obligations of the Company to the Revolver
Banks and the Agent arising under or in connection with the Bank Revolver
Agreement and the Swap Agreements from time to time is guaranteed pursuant to
those certain Guaranties dated as of April 29, 1999 from each of Mountain Gas
Resources, Inc., a Delaware corporation ("MGR"), Western Gas Resources Texas,
Inc., a Texas corporation ("WGRT"), MGTC, Inc., a Wyoming corporation ("MGTC")
and MIGC, Inc., a Delaware corporation ("MIGC"), WGR Canada, Inc., a New
Brunswick corporation ("Canada"), Lance Oil & Gas Company, Inc., a Delaware
corporation ("Lance"), and Western Gas Wyoming, L.L.C., a Wyoming limited
liability company ("WGW") (MGR, WGRT, MGTC, MIGC, Canada, Lance, and WGW being
herein and sometimes collectively called the "Guarantors" and individually
called a "Guarantor") in favor of the Revolver Banks and the Agent (herein, as
amended from time to time, collectively called the "Bank Guaranties");
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     WHEREAS, the Company has heretofore executed and delivered to Prudential
those certain Senior Notes dated October 27, 1992, September 22, 1993, December
27, 1993, October 27, 1994, and July 28, 1995 issued pursuant to a Master Shelf
Agreement dated as of December 19, 1991 by and between the Company and
Prudential, as amended and restated pursuant to that certain Amended and
Restated Master Shelf Agreement dated as of December 19, 1991 (herein, as
amended from time to time, called the "Prudential Agreement"; the Bank Revolver
Agreement, the Swap Agreements, and the Prudential Agreement and collectively
referred to herein as the "Credit Agreements") and may issue additional Senior
Notes pursuant to the Prudential Agreement, in each case evidencing indebtedness
of the Company to Prudential (the Senior Notes dated October 27, 1992, September
22, 1993, December 27, 1993, October 27, 1994, and July 28, 1995 and any
additional Senior Notes issued pursuant to the Prudential Agreement being herein
called the "Prudential Notes");

     WHEREAS, each Guarantor has heretofore executed and delivered to Prudential
its guaranty (herein, as amended from time to time, collectively called the
"Prudential Guaranties"), guaranteeing payment of obligations of the Company to
Prudential arising under or in connection with the Prudential Notes and the
Prudential Agreement and, to the extent Prudential enters into a Swap Agreement,
any such Swap Agreement (by amendment to the Prudential Guaranties);

     WHEREAS, hereafter subsidiaries of the Company may from time to time issue
additional guaranties in favor of the Revolver Banks or any of them in
connection with the Bank Revolver Agreement, in favor of any Swap Lenders (as
hereinafter defined) in connection with any Swap Agreements, or in favor of
Prudential in connection with the Prudential Notes and the Prudential Agreement
(any such guaranty being an "Additional Guaranty" and any subsidiaries executing
an Additional Guaranty herein being collectively called the "Additional
Guarantors"; the Bank Guaranties, the Prudential Guaranties and the Additional
Guaranties herein being collectively called the "Subject Guaranties" and
individually called a "Subject Guaranty");

     WHEREAS, the Company has executed and delivered to the Agent for the
benefit of the Revolver Banks that certain Pledge Agreement dated as of April
29, 1999, pursuant to which the Company has granted to the Agent a security
interest in all of its ownership interests in its subsidiaries, and MIGC has
executed and delivered to the Agent for the benefit of the Revolver Banks that
certain Stock Pledge Agreement dated as of April 29, 1999, pursuant to which
MIGC has granted to the Agent a security interest in all of its ownership
interests in MGTC (such Pledge Agreements as from time to time amended,
supplemented or restated are herein being collectively called the "Bank Pledge
Agreements");

     WHEREAS, the Company has executed and delivered to Prudential that certain
Pledge Agreement dated as of April 29, 1999, pursuant to which the Company has
granted to Prudential a security interest in all of its ownership interests in
its subsidiaries, and MIGC has executed and delivered to Prudential that certain
Pledge Agreement dated as of April 29, 1999, pursuant to which MIGC has granted
to Prudential a security interest in all of its ownership interests in

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<PAGE>

MGTC (such Pledge Agreements as from time to time amended, supplemented or
restated are herein being collectively called the "Prudential Pledge
Agreements");

     WHEREAS, subsidiaries of the Company may from time to time create
additional pledge agreements in favor of the Revolver Banks or any of them in
connection with the Bank Revolver Agreement, in favor of any Swap Lenders in
connection with any Swap Agreements, or in favor of Prudential in connection
with the Prudential Notes and the Prudential Agreement (any such pledge
agreement being an "Additional Pledge Agreement" and any subsidiaries executing
an Additional Pledge Agreement herein being collectively called the "Additional
Pledgors"; the Bank Pledge Agreements, the Prudential Pledge Agreements, and the
Additional Pledge Agreements herein being collectively called the "Pledge
Agreements" and individually called a "Pledge Agreement");

     WHEREAS, the Agent, Prudential, and the Revolver Banks have entered into
that certain Intercreditor Agreement dated as of as of April 29, 1999 (as
amended, supplemented, or restated to the date hereof, the "Existing
Intercreditor Agreement") to evidence their agreement with respect to certain
payments that may be received by the Lenders under or in connection with the
Subject Guaranties; and

     WHEREAS, the Lenders desire to amend and restate the Existing Intercreditor
Agreement as provided herein;

     NOW, THEREFORE, in consideration of the premises and the mutual agreements
herein contained, the Lenders hereby agree that the Existing Intercreditor
Agreement is hereby amended and restated to read in its entirety as follows:

     1.  If, after the occurrence and during the continuance of a "Default" or
"Event of Default" under any Credit Agreement (as "Default" or "Event of
Default" is defined in each Credit Agreement) any Lender shall at any time
obtain any payment or other recovery (whether voluntary, involuntary, by
application of setoff or otherwise) from any Guarantor pursuant to a Subject
Guaranty (each date on which a Lender receives any such payment or recovery is
herein called a "Calculation Date") in excess of its Proportionate Share (as
defined below) calculated as of such date of payments or other recoveries then
or therewith obtained by all Lenders with respect to the Subject Guaranties,
such Lender shall purchase from the other Lenders such participation(s) in the
Indebtedness (as defined below) of the Company held by such other Lenders that
is guaranteed pursuant to such other Lenders' Subject Guaranty or Subject
Guaranties, as shall be necessary to cause such purchasing Lender to share such
payment or other recovery ratably with such selling Lenders; provided, however,
                                                             --------  -------
that if all or any portion of such payment or other recovery is thereafter
recovered from such purchasing Lender, the purchase shall be rescinded, and each
selling Lender shall repay to the purchasing Lender the purchase price, to the
ratable extent of such recovery, together with an amount equal to such selling
Lender's ratable share (according to the proportion of (x) the amount of such
selling Lender's required repayment to the purchasing Lender to (y) the total
amount so recovered from the purchasing Lender) of any interest or other amount
paid or payable by the purchasing Lender in

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respect of the total amount so recovered. Notwithstanding the foregoing, if a
Swap Amount is not due and owing on a Calculation Date or does not actually
become due and owing within 30 days of such Calculation Date, and as a result of
the inclusion of the Swap Amount in calculating a Swap Lender's Proportionate
Share, such Swap Lender receives a greater portion of any payment or other
recovery from any Guarantor than it would have if the Swap Amount had not been
included in such calculation (such amount is herein called an "Excess Amount"),
then such Swap Lender shall immediately purchase from each other Lender such
participation(s) in the Indebtedness of the Company held by such other Lender
that is guaranteed pursuant to such other Lender's Subject Guaranty or Subject
Guaranties in an amount equal to such other Lender's Proportionate Share as of
such Calculation Date (after being recalculated to exclude the Swap Amount) of
the Excess Amount plus such other Lender's Proportionate Share of any interest
earned by the Swap Lender or such Excess Amount.

     As used herein the following definitions shall have the meanings set forth
below:

          (a) The term "Proportionate Share", as used herein, shall mean a
     fraction (i) the numerator of which is the sum of the Indebtedness owing to
     such Lender plus the Swap Amount and/or Make-Whole Amount (as such terms
     are defined below) owing to such Lender and (ii) the denominator of which
     is the sum of the Indebtedness owing to all Lenders plus the Swap Amount
     and/or Make-Whole Amount owing to all Lenders;

          (b) The term "Indebtedness", as used herein, shall mean with respect
     to each Calculation Date, the aggregate outstanding principal amount of
     indebtedness of the Company under the Bank Revolver Agreement, the Revolver
     Notes, the Prudential Agreement, and the Prudential Notes;

          (c) The term "Make-Whole Amount" as used herein shall mean with
     respect to Prudential, the "Yield Maintenance Amount" as defined in the
     Prudential Agreement except that (for purposes of this Agreement only) the
     "Reinvestment Yield", which is defined in the Prudential Agreement and used
     in computing such Yield Maintenance Amount, shall be the rate of 1.29% per
     annum with respect to the 7.51% Notes, 1.32% per annum with respect to the
     7.99% Notes, 1.35% per annum with respect to the 6.77% Notes, 1.40% per
     annum with respect to the 7.23% Notes, 1.40% per annum with respect to the
     9.05% Notes, 1.45% per annum with respect to the 9.24% Notes, and 1.55% per
     annum with respect to the 7.61% Notes [initial spread over comparable U.S.
     treasuries at time of commitment used to set the coupon, which is payable
     quarterly] above the Reinvestment Yield, as it would otherwise be
     calculated under the Prudential Agreement, and with respect to additional
     Prudential Notes issued under the Prudential Agreement, the initial spread
     over comparable average life U.S. treasuries at time of commitment to
     purchase such Prudential Notes above the Reinvestment Yield, as it would
     otherwise be calculated under the Prudential Agreement; and

          (d) The term "Swap Amount", as used herein, shall mean with respect to
     each Lender (a "Swap Lender") on each Calculation Date and on each
     Determination Date, the aggregate amount of all breakage, unwinding and all
     related costs under all Swap

                                       4
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     Agreements which would be due and owing thereunder to such Swap Lender on
     such Calculation Date or Determination Date if any such Swap Agreement was
     terminated on such date whether or not such Swap Amount is actually due and
     owing on such date.

          2.  If any Lender shall at any time obtain any payment or other
recovery (whether voluntary, involuntary, or otherwise) under a Pledge Agreement
(each date on which a Lender receives any such payment or recovery is herein
called a "Determination Date") in excess of its Proportionate Share (as defined
below) calculated as of such date of payments or other recoveries then or
therewith obtained by all Lenders under a Pledge Agreement, such Lender shall
purchase from the other Lenders such participation(s) in the Indebtedness of the
Company held by such other Lenders that is secured by the Pledge Agreements, as
shall be necessary to cause such purchasing Lender to share such payment or
other recovery ratably with such selling Lenders; provided, however, that if all
                                                  --------  -------
or any portion of such payment or other recovery is thereafter recovered from
such purchasing Lender, the purchase shall be rescinded, and each selling Lender
shall repay to the purchasing Lender the purchase price, to the ratable extent
of such recovery, together with an amount equal to such selling Lender's ratable
share (according to the proportion of (x) the amount of such selling Lender's
required repayment to the purchasing Lender to (y) the total amount so recovered
from the purchasing Lender) of any interest or other amount paid or payable by
the purchasing Lender in respect of the total amount so recovered.
Notwithstanding the foregoing, if a Swap Amount is not due and owing on a
Determination Date or does not actually become due and owing within 30 days of
such Determination Date, and as a result of the inclusion of the Swap Amount in
calculating a Swap Lender's Proportionate Share, such Swap Lender receives a
greater portion of any payment or other recovery with respect to the Pledged
Interests under any Pledge Agreement than it would have if the Swap Amount had
not been included in such calculation (such amount is herein called a "Pledge
Agreement Excess Amount"), then such Swap Lender shall immediately purchase from
each other Lender such participation(s) in the Indebtedness of the Company held
by such other Lender that is secured under such other Lender's Pledge Agreement
in an amount equal to such other Lender's Proportionate Share as of such
Determination Date (after being recalculated to exclude the Swap Amount) of the
Pledge Agreement Excess Amount plus such other Lender's Proportionate Share of
any interest earned by the Swap Lender or such Pledge Agreement Excess Amount.

     As used herein, the term "Pledged Interests" shall mean all of the personal
property of the Company, MIGC or any Additional Pledgor in which a security
interest is granted pursuant to the Pledge Agreements; and

     3.  Each of the Company and each Guarantor, by signing the Consent and
Agreement attached hereto, agrees that each Lender so purchasing a participation
from another Lender pursuant to Section 1 or 2 hereof may, to the fullest extent
permitted by law, exercise all its rights of payment (including rights of
setoff) with respect to such participation as fully as if such Lender were the
direct creditor of the Company and such Guarantor in the amount of such
participation.  By its execution of the Consent and Agreement, the Company
hereby agrees that it shall cause each Additional Guarantor and each Additional
Pledgor to execute and deliver to Lenders a Consent and Agreement substantially
in the form attached hereto concurrently with the delivery of its respective
Additional Guaranty or Additional Pledge Agreement, as applicable.

                                       5
<PAGE>

     4.  If under any applicable bankruptcy, insolvency or other similar law,
any Lender receives a secured claim in lieu of a setoff to which Section 2
hereof applies, such Lender shall exercise its rights in respect of such secured
claim in a manner consistent with the rights of the other Lenders in accordance
with Section 1 hereof.

     5.  All security interests of the Lenders in the Pledged Interests shall be

pari passu regardless of the order of filing of any financing statements with
----------
respect thereto or the taking of any other action relevant to the determination
of the perfection or priority of such security interests.  Except for the
filings to be made by the Agent on behalf of the Revolver Banks, each Lender
shall be responsible for the preparation and filing of its respective financing
statement covering the Pledged Interests.  The Lenders hereby direct the Agent
to receive and maintain physical possession, of all certificates (the
"Certificates") evidencing the Pledged Interests.   The Agent will hold the
Certificates to perfect each Lender's security interest in the Pledged
Interests.  The Agent will hold the Certificates in its capacity as collateral
agent for Revolver Lenders and as bailee on behalf of Prudential and any
subsequent holder of Prudential Notes.  Prudential hereby acknowledges that the
Agent is acting on its behalf solely as a bailee and has no fiduciary obligation
to Prudential or any subsequent holder of Prudential Notes.

     6.  Prior to the occurrence of an Acceleration Event, no Lender shall
exercise any remedy or other right available to it with respect to any Pledged
Interest. Concurrently with the occurrence of any event described in either
clause (i) or (ii) of the definition of Acceleration Event, the Lender so
accelerating its Note shall give written notice of such Acceleration Event to
the Agent, in its capacity as collateral agent and bailee, and each other
Lender. After the occurrence of an Acceleration Event, upon ten (10) days notice
to Agent and each other Lender, any Lender may exercise remedies pursuant to its
respective Pledge Agreement; provided that all proceeds from any such exercise
of remedies shall be subject to the sharing provisions of Section 2 hereof.

     As used herein, the following definitions shall have the meanings set forth
below:

          (a) The term "Acceleration Event", as used herein, shall mean (i) the
     failure by the Company to pay in full the outstanding principal balance of
     and any accrued and unpaid interest on any Note on the final maturity date
     of such Note; (ii) the acceleration of the outstanding principal balance of
     and any accrued and unpaid interest on, any Note by any Lender or by any
     person or entity acting on behalf of any Lender; or (iii) the Company or
     MIGC (A) suffers the entry against it of a judgment, decree or order or
     relief by a court of competent jurisdiction in an involuntary proceeding
     commenced under any applicable bankruptcy, insolvency or other similar law
     of any jurisdiction now or hereafter in effect, including the federal
     Bankruptcy Code, as from time to time amended, or has any such proceeding
     commenced against it which remains undismissed for a period of sixty days;
     (B) commences a voluntary case under any applicable bankruptcy, insolvency
     or similar law now or hereafter in effect, including the federal Bankruptcy
     Code, as from time to time amended; or applies for or consents to the entry
     of an order for relief in an involuntary case under any such law; or makes
     a general assignment for the

                                       6
<PAGE>

     benefit of creditors; or fails generally to pay (or admits in writing its
     inability to pay) its debts as such debts become due; or takes corporate or
     other action to authorize any of the foregoing; or (C) suffers the
     appointment of or taking possession by a receiver, liquidator, assignee,
     custodian, trustee, sequestrator or similar official of all or a
     substantial part of its assets in a proceeding brought against or initiated
     by it, and such appointment or taking possession is neither made
     ineffective nor discharged within thirty days after the making thereof, or
     such appointment or taking possession is at any time consented to,
     requested by, or acquiesced to by it; and

          (b) The term "Note", as used herein, shall mean any of the Revolver
     Notes or  the Prudential Notes.

     7.  This Agreement shall in all respects be a continuing, absolute,
unconditional and irrevocable agreement, and shall remain in full force and
effect until all obligations of the Guarantors and the Additional Guarantors to
the Lenders shall have been satisfied in full, all obligations of all Lenders to
the other Lenders hereunder shall have been satisfied in full and all Pledge
Agreements have been terminated.  Each Lender agrees that this Agreement shall
continue to be effective or be reinstated, as the case may be, if at any time
any payment (in whole or in part) of any of the obligations of the Company, any
of the Guarantors or any of the Additional Guarantors is rescinded or must
otherwise be restored by any Lender, upon the insolvency, bankruptcy or
reorganization of the Company, any of the Guarantors or any of the Additional
Guarantors or otherwise, as though such payment had not been made.

     8.  In order to induce Prudential to enter into this Agreement, each of the
Revolver Banks and the Agent severally represent and warrant to Prudential that
it has full corporate power, and has taken all action necessary, to execute and
deliver this Agreement and to fulfill its respective obligations hereunder, and
that no governmental or other authorizations are required in connection
herewith, and that this Agreement constitutes its legal, valid and binding
obligation, enforceable in accordance with its terms, except as limited by
bankruptcy, insolvency, reorganization, moratorium, regulatory and similar laws
of general application and by general principles of equity.

     9.  In order to induce the Revolver Banks and the Agent to enter into this
Agreement, Prudential represents and warrants to the Revolver Banks and the
Agent that it has full corporate power, and has taken all action necessary, to
execute and deliver this Agreement and to fulfill its obligations hereunder, and
that no governmental or other authorizations are required in connection
herewith, and that this Agreement constitutes its legal, valid and binding
obligation, enforceable in accordance with its terms, except as limited by
bankruptcy, insolvency, reorganization, moratorium, regulatory and similar laws
of general application and by general principles of equity.

     10.  This Agreement shall be binding upon, and inure to the benefit of and
be enforceable by, the Lenders and each of their respective successors,
transferees and assigns.  Without limiting the generality of the foregoing
sentence, any Lender may assign or otherwise transfer (in whole or in part) to
any other person or entity the obligations of the Company, any of

                                       7
<PAGE>

the Guarantors, any of the Additional Guarantors or any of the Additional
Pledgors to such Lender (with respect to the Revolver Banks, subject to the
provisions of the Revolver Bank Agreement), and such other person or entity
shall thereupon become vested with all rights and benefits, and become subject
to all the obligations, in respect thereof granted to or imposed upon such
Lender under this Agreement, subject, however, to any contrary provisions in
such assignment or transfer (with respect to the Revolver Banks, subject to the
provisions of the Revolver Bank Agreement). Prudential will cause any Prudential
Affiliate who purchases any Note to execute a copy of this Agreement and deliver
it to each Lender.

     11.  None of the provisions of this Agreement shall inure to the benefit of
the Company, any of the Guarantors, any of the Additional Guarantors, any of the
Additional Pledgors or any other person than the Lenders; consequently, the
Company, the Guarantors, the Additional Guarantors, the Additional Pledgors and
any and all other persons shall not be entitled to rely upon, or to raise as a
defense, in any manner whatsoever, the provisions of this Agreement or the
failure of any Lender to comply with such provisions.

     12.  No amendment to or waiver of any provision of this Agreement, nor
consent to any departure by any Lender herefrom, shall in any event be effective
unless the same shall be in writing and signed by all the Lenders, and then such
waiver or consent shall be effective only in the specific instance and for the
specific purpose for which given.

     13.  All notices and other communications provided to any Lender under this
Agreement shall be in writing or by facsimile and addressed, delivered or
transmitted to such Lender at its address or facsimile number set forth (a) on
Annex 1 hereto, or (b) at such other address or facsimile number as may be
designated by such Lender in a notice to the other Lenders.  Any notice, if
mailed and properly addressed with postage prepaid or if properly addressed and
sent by prepaid courier service, shall be deemed given received; any notice, if
transmitted by facsimile, shall be deemed given when transmitted if actually
received, and the burden of proving receipt shall be on the transmitting Lender.

     14.  No failure or delay on the part of any Lender in exercising any power
or right under this Agreement shall operate as a waiver thereof, nor shall any
single or partial exercise of any such power or right preclude any other or
further exercise thereof of the exercise of any other power or right.  The
remedies herein provided are cumulative and not exclusive of any remedies
provided by law.

     15.  Whenever possible each provision of this Agreement shall be
interpreted in such manner as to be effective and valid under applicable law,
but if any provision of this Agreement shall be prohibited by or invalid under
such law, such provision shall be ineffective to the extent of such prohibition
or invalidity, without invalidating the remainder of such provision or the
remaining provisions of this Agreement.

     16.  THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH
THE INTERNAL LAWS OF THE STATE OF TEXAS.  THIS AGREEMENT CONSTITUTES THE ENTIRE
UNDERSTANDING BETWEEN THE

                                       8
<PAGE>

PARTIES HERETO WITH RESPECT TO THE SUBJECT MATTER HEREOF AND SUPERSEDES ANY
PRIOR AGREEMENTS, WRITTEN OR ORAL, WITH RESPECT THERETO.

     17.  EACH LENDER HEREBY KNOWINGLY, VOLUNTARILY AND INTENTIONALLY WAIVES ANY
RIGHTS IT MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY LITIGATION BASED HEREON,
OR ARISING OUT OF, UNDER, OR IN CONNECTION WITH, THIS AGREEMENT, OR ANY COURSE
OF CONDUCT, COURSE OF DEALING, STATEMENTS (WHETHER ORAL OR WRITTEN) OR ACTIONS
OF ANY LENDER IN CONNECTION HEREWITH.  EACH LENDER ACKNOWLEDGES AND AGREES THAT
IT HAS RECEIVED FULL AND SUFFICIENT CONSIDERATION FOR THIS PROVISION AND THAT
THIS PROVISION IS A MATERIAL INDUCEMENT FOR THE OTHER LENDERS ENTERING INTO THIS
AGREEMENT.

     18.  This Agreement 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 Agreement.

                                       9
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed as of April 26, 2001 by their duly authorized officers.

                              BANK OF AMERICA, N.A.

                              By:____________________________________
                                 Name:
                                 Title:

                                       10

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