Document:

<PAGE>   1
                                                                    EXHIBIT 10.2

                                     FORM OF
                      SECOND AMENDMENT TO CREDIT AGREEMENT

         THIS SECOND AMENDMENT TO CREDIT AGREEMENT (this "AMENDMENT") is entered
into as of July 31, 2001, among WILLIAMS OLP, L.P., a Delaware limited
partnership ("BORROWER"), the undersigned Guarantors ("GUARANTORS"), BANK OF
AMERICA, N.A., as Administrative Agent (the "ADMINISTRATIVE AGENT") for the
Lenders under the Credit Agreement hereinafter referenced, and the Lenders (as
defined in the Credit Agreement) party hereto.

         Reference is made to the Credit Agreement dated as of February 6, 2001
(the "CREDIT AGREEMENT") among Borrower, Administrative Agent, Lehman Commercial
Paper, Inc., as Syndication Agent, SunTrust Bank as Documentation Agent, and the
Lenders party thereto, as amended by that certain First Amendment to Credit
Agreement dated as of July 31, 2001. Unless otherwise defined in this Amendment,
capitalized terms used herein shall have the meaning set forth in the Credit
Agreement; all Section and Schedule references herein are to Sections and
Schedules in the Credit Agreement; and all Paragraph references herein are to
Paragraphs in this Amendment.

                                    RECITALS

         A. Borrower has requested that the Lenders agree to amend certain
provisions of the Credit Agreement, as herein set forth, in order to increase
the Revolver Commitment by increasing the Acquisition Subfacility Commitment by
$25,000,000.

         B. Additionally, Borrower has requested a modification of the
definition of Consolidated Net Income which would cap general and administrative
expenses at $1,500,000 for each quarter prior to the second quarter of 2001 for
purposes of calculating the Interest Coverage Ratio, the Leverage Ratio and the
Applicable Rate.

         C. Subject to the terms and conditions of this Amendment, the Lenders
are willing to agree to such amendments.

         Accordingly, for adequate and sufficient consideration, the parties
hereto agree, as follows:

         PARAGRAPH 1.      AMENDMENTS.

         1.1 DEFINITIONS.

         (a) The definition of "ACQUISITION SUBFACILITY COMMITMENT" is amended
in its entirety to read as follows:

                  "ACQUISITION SUBFACILITY COMMITMENT means an amount (subject
                  to reduction or cancellation as herein provided) equal to
                  $73,000,000.00."

         (b) The definition of "CONSOLIDATED NET INCOME" is amended to add the
following language to the end of such definition:

                  "For purposes of determining compliance with SECTIONS 7.14(a)
                  and 7.14(b) and for purposes of determining the Applicable
                  Rate, Consolidated Net Income for each of the fiscal quarters
                  ending on or

                                            SECOND AMENDMENT TO CREDIT AGREEMENT
                                       1
<PAGE>   2

                  prior to March 31, 2001 shall not include G&A Expenses in
                  excess of $1,500,000 for such quarter. "G&A EXPENSES" shall
                  mean general and administrative expenses required to be
                  reimbursed by Borrower to TWC pursuant to the Omnibus
                  Agreement."

         1.2 SCHEDULE 2.01. SCHEDULE 2.01 is hereby deleted in its entirety and
SCHEDULE 2.01 attached hereto is substituted in lieu thereof.

         1.3 EXHIBITS.

                  (a) EXHIBIT A-1 is hereby deleted in its entirety and EXHIBIT
         A-1 attached hereto is substituted in lieu thereof.

                  (b) EXHIBIT C-1 is hereby deleted in its entirety and EXHIBIT
         C-1 attached hereto is substituted in lieu thereof.

         PARAGRAPH 2. EFFECTIVE DATE. Notwithstanding any contrary provision,
this Amendment is not effective until the date (the "EFFECTIVE DATE") (a) the
Administrative Agent shall have received counterparts of this Amendment,
executed by Borrower, Guarantors and each of the Lenders, and (b) Borrower shall
have paid to the Administrative Agent for the account of each Lender an
amendment fee equal to 25 basis points times the amount of the increase in such
Lender's Commitment reflected in SCHEDULE 2.01 attached hereto.

         PARAGRAPH 3. ACKNOWLEDGMENT AND RATIFICATION. As a material inducement
to the Administrative Agent and the Lenders to execute and deliver this
Amendment, Borrower and each Guarantor (a) consent to the agreements in this
Amendment and (b) agree and acknowledge that the execution, delivery, and
performance of this Amendment shall in no way release, diminish, impair, reduce,
or otherwise affect the respective obligations of Borrower or any Guarantor
under the Loan Documents to which it is a party, which Loan Documents shall
remain in full force and effect, and all guaranties and Rights thereunder are
hereby ratified and confirmed.

         PARAGRAPH 4. REPRESENTATIONS. As a material inducement to the
Administrative Agent and the Lenders to execute and deliver this Amendment,
Borrower and each Guarantor represent and warrant to the Administrative Agent
and the Lenders that as of the Effective Date of this Amendment and as of the
date of execution of this Amendment, (a) all representations and warranties in
the Loan Documents are true and correct in all material respects as though made
on the date hereof, except to the extent that any of them speak to a different
specific date, and (b) no Default or Event of Default exists.

         PARAGRAPH 5. EXPENSES. Borrower shall pay all reasonable costs, fees,
and expenses paid or incurred by Administrative Agent incident to this
Amendment, including, without limitation, the fees and expenses of
Administrative Agent's counsel in connection with the negotiation, preparation,
delivery, and execution of this Amendment and any related documents.

         PARAGRAPH 6. MISCELLANEOUS. This Amendment is a "Loan Document"
referred to in the Credit Agreement. The provisions relating to Loan Documents
in ARTICLE 10 of the Credit Agreement are incorporated in this Amendment by
reference. Unless stated otherwise (a) the singular number includes the plural
and vice versa and words of any gender include each other gender, in each case,
as appropriate, (b) headings and captions may not be construed in interpreting
provisions, (c) this Amendment must be construed, and its performance enforced,
under New York law, (d) if any part of this Amendment is for any reason found to
be unenforceable, all other portions of it nevertheless remain enforceable, and
(e)

                                            SECOND AMENDMENT TO CREDIT AGREEMENT
                                       2
<PAGE>   3

this Amendment may be executed in any number of counterparts with the same
effect as if all signatories had signed the same document, and all of those
counterparts must be construed together to constitute the same document.

         PARAGRAPH 7. ENTIRE AGREEMENT. THIS AMENDMENT REPRESENTS THE FINAL
AGREEMENT BETWEEN THE PARTIES ABOUT THE SUBJECT MATTER OF THIS AMENDMENT 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.

         PARAGRAPH 8. PARTIES. This Amendment binds and inures to the benefit of
Borrower, Guarantors, Administrative Agent, the Lenders, and their respective
successors and assigns.

         PARAGRAPH 9. FURTHER ASSURANCES. The parties hereto each agree to
execute from time to time such further documents as may be necessary to
implement the terms of this Agreement.

         The parties hereto have executed this Amendment in multiple
counterparts to be effective as of the Effective Date.

        REMAINDER OF PAGE INTENTIONALLY BLANK. SIGNATURE PAGES TO FOLLOW.

                                            SECOND AMENDMENT TO CREDIT AGREEMENT
                                       3
<PAGE>   4

                                       BORROWER:

                                       WILLIAMS OLP, L.P.

                                       By:  WILLIAMS GP LLC, its
                                            General Partner

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

            [SIGNATURE PAGE TO SECOND AMENDMENT TO CREDIT AGREEMENT]
<PAGE>   5

                                       GUARANTORS:

                                       WILLIAMS NGL, LLC

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

                                       WILLIAMS TERMINALS HOLDING L.P.

                                       By:  WILLIAMS NGL, LLC, its
                                            General Partner

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

                                       WILLIAMS PIPELINES HOLDINGS L.P.

                                       By:  WILLIAMS NGL, LLC, its
                                            General Partner

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

                                       WILLIAMS AMMONIA PIPELINE L.P.

                                       By:  WILLIAMS NGL, LLC, its
                                            General Partner

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

            [SIGNATURE PAGE TO SECOND AMENDMENT TO CREDIT AGREEMENT]
<PAGE>   6

                                       bank of america, n.a., as Administrative
                                       Agent and as a Lender

                                       By:
                                          --------------------------------------
                                          Claire M. Liu
                                          Managing Director

            [SIGNATURE PAGE TO SECOND AMENDMENT TO CREDIT AGREEMENT]
<PAGE>   7

                                       LEHMAN COMMERCIAL PAPER, INC.

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

            [SIGNATURE PAGE TO SECOND AMENDMENT TO CREDIT AGREEMENT]
<PAGE>   8

                                       SUNTRUST BANK

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

            [SIGNATURE PAGE TO SECOND AMENDMENT TO CREDIT AGREEMENT]
<PAGE>   9

                                       ABN AMRO BANK, N.V.

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

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

            [SIGNATURE PAGE TO SECOND AMENDMENT TO CREDIT AGREEMENT]
<PAGE>   10

                                       NATIONAL WESTMINSTER BANK PLC,
                                       NEW YORK BRANCH

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

            [SIGNATURE PAGE TO SECOND AMENDMENT TO CREDIT AGREEMENT]
<PAGE>   11

                                       BANK ONE, NA

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

            [SIGNATURE PAGE TO SECOND AMENDMENT TO CREDIT AGREEMENT]
<PAGE>   12

                                       BARCLAYS BANK PLC

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

            [SIGNATURE PAGE TO SECOND AMENDMENT TO CREDIT AGREEMENT]
<PAGE>   13

                                       BAYERISCHE LANDESBANK GIROZENTRALE,
                                       CAYMAN ISLANDS BRANCH

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

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

            [SIGNATURE PAGE TO SECOND AMENDMENT TO CREDIT AGREEMENT]
<PAGE>   14

                                       NATEXIS BANQUES POPULAIRES

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

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

            [SIGNATURE PAGE TO SECOND AMENDMENT TO CREDIT AGREEMENT]
<PAGE>   15

                                       UBS AG, STAMFORD BRANCH

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

            [SIGNATURE PAGE TO SECOND AMENDMENT TO CREDIT AGREEMENT]
<PAGE>   16

                                  SCHEDULE 2.01

                                   COMMITMENTS

<Table>
<Caption>
              LENDER                                      REVOLVING FACILITY                                TERM LOAN FACILITY
                                                          ------------------                                ------------------
                                                                           Working Capital/
                                        Acquisition Subfacility        Distribution Subfacility
                                        -----------------------        ------------------------
<S>                                     <C>                            <C>                                  <C>
Bank of America                              $9,800,000.00                   $1,200,000.00                    $ 9,000,000.00

Lehman Commercial Paper, Inc.                $7,300,000.00                   $1,200,000.00                    $ 9,000,000.00

SunTrust Bank                                $8,100,000.00                   $1,400,000.00                    $10,500,000.00

ABN AMRO Bank, N.V.                          $8,100,000.00                   $1,400,000.00                    $10,500,000.00

National Westminster Bank Plc                $8,100,000.00                   $1,400,000.00                    $10,500,000.00

Bank One, NA                                 $7,300,000.00                   $1,200,000.00                    $ 9,000,000.00

Barclays Bank Plc                            $4,800,000.00                   $1,200,000.00                    $ 9,000,000.00

Bayerische Landesbank Girozentrale           $7,300,000.00                   $1,200,000.00                    $ 9,000,000.00

UBS AG, Stamford Branch                      $6,500,000.00                   $1,000,000.00                    $ 7,500,000.00

Natexis Banques Populaires                   $5,700,000.00                   $  800,000.00                    $ 6,000,000.00

              Total:                         $  73,000,000                   $  12,000,000                    $   90,000,000
</Table>

                                                                   SCHEDULE 2.01
<PAGE>   17

                                                                     EXHIBIT A-1

                            FORM OF BORROWING NOTICE

                                                       Date:  ___________, _____

To:      Bank of America, N.A., as Administrative Agent

Ladies and Gentlemen:

Reference is made to that certain Credit Agreement, dated as of February 6, 2001
(as amended, restated, extended, supplemented or otherwise modified in writing
from time to time, the "AGREEMENT;" the terms defined therein being used herein
as therein defined), among Williams OLP, L.P., a Delaware limited partnership
(the "BORROWER"), the Lenders from time to time party thereto, Bank of America,
N.A., as Administrative Agent, Lehman Commercial Paper, Inc., as Syndication
Agent, and SunTrust Bank, as Documentation Agent.

The undersigned hereby requests (select one):

I.       REVOLVER FACILITY

         A.       Acquisition Subfacility

                  1.       Status Information for the Acquisition Subfacility

                           (a)      Amount of the Acquisition Subfacility:
                                    $73,000,000

                           (b)      Acquisition Subfacility Principal Debt prior
                                    to the Borrowing requested herein:
                                    $____________

                           (c)      Principal amount of Loans under the
                                    Acquisition Subfacility available to be
                                    borrowed: $______________

                  2.       Amount of Borrowing: $___________

                  3.       Requested date of Borrowing: _________________, 200_.

                  4.       Requested Type of Loan and applicable Dollar amount:

                           (a)      Base Rate Loan for
                                    $________________________.

                           (b)      Eurodollar Rate Loan with Interest Period
                                    of:

                                    (i)      one month for $_______________

                                    (ii)     two months for $_______________

                                    (iii)    three months for $_______________

                                    (iv)     six months for $_______________

                                   Exhibit A-1
                                     Page 1
                            Form of Borrowing Notice
<PAGE>   18

B.     Working Capital/Distribution Subfacility

                1.       Status Information for the Working
                         Capital/Distribution Subfacility

                         (a)      Amount of the Working Capital/Distribution
                                  Subfacility: $12,000,000

                         (b)      Working Capital/Distribution Subfacility
                                  Principal Debt prior to the Borrowing
                                  requested herein: $____________

                         (c)      Principal amount of Loans under the Working
                                  Capital/Distribution Subfacility available
                                  to be borrowed (prior to the following
                                  requested herein) (1(a) minus 1(b)):
                                  $______________

                2.       Amount of Borrowing: $____________

                3.       Requested date of Borrowing: ______________, 200_.

                4.       Requested Type of Loan and applicable Dollar amount:

                         (a)      Base Rate Loan for
                                  $________________________.

                         (b)      Eurodollar Rate Loan with Interest Period
                                  of:

                                  (i)      one month for $_______________

                                  (ii)     two months for $_______________

                                  (iii)    three months for $_______________

                                  (iv)     six months for $_______________

                5.       Purpose of Loan:

                         ___ Working Capital

                         ___ To fund Quarterly Distribution (Section 6.11(c)(ii)
                             of the Agreement)

                6.       If the Loan is for the purpose of funding Quarterly
                         Distribution: Amount remaining undrawn under the
                         Working Capital/Distribution Subfacility after giving
                         effect to the Borrowing herein requested is:
                         $___________ (must be not less than $9,000,000)

II.    Term Loan Facility

                1.       Amount of Borrowing: $___________

                2.       Requested date of Borrowing: _________________, 200_.

                3.       Requested Type of Loan and applicable Dollar amount:

                         (a)      Base Rate Loan for
                                  $________________________.

                         (b)      Eurodollar Rate Loan with Interest Period
                                  of:

                                   Exhibit A-1
                                     Page 2
                            Form of Borrowing Notice
<PAGE>   19

                                    (i)      one month for $_______________

                                    (ii)     two months for $_______________

                                    (iii)    three months for $_______________

                                    (iv)     six months for $_______________

The undersigned hereby certifies that the following statements will be true on
the date of the proposed Borrowing(s) after giving effect thereto and to the
application of the proceeds therefrom:

                  (a) the representations and warranties of the Borrower
contained in ARTICLE V of the Agreement are true and correct as though made on
and as of such date (except such representations and warranties which expressly
refer to an earlier date, which are true and correct as of such earlier date);
and

                  (b) no Default or Event of Default has occurred and is
continuing, or would result from such proposed Borrowing(s).

The Borrowing requested herein complies with SECTIONS 2.01, 2.02 and 2.03 of the
Agreement, as applicable.

                                       WILLIAMS OLP, L.P.

                                       By   Williams GP LLC, its
                                            General Partner

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

                                   Exhibit A-1
                                     Page 3
                            Form of Borrowing Notice
<PAGE>   20

                                                                     EXHIBIT C-1

                         FORM OF COMPLIANCE CERTIFICATE
                   (Pursuant to SECTION 6.02 of the Agreement)

         Financial Statement Date:  ___________, ____

To:      Bank of America, N.A., as Administrative Agent

Ladies and Gentlemen:

Reference is made to that certain Credit Agreement, dated as of February 6, 2001
(as amended, restated, extended, supplemented or otherwise modified in writing
from time to time, the "AGREEMENT;" the terms defined therein being used herein
as therein defined), among Williams OLP, L.P., a Delaware limited partnership
(the "BORROWER"), the Lenders from time to time party thereto, Bank of America,
N.A., as Administrative Agent, Lehman Commercial Paper, Inc., as Syndication
Agent, and SunTrust Bank, as Documentation Agent. Capitalized terms used herein
but not defined herein shall have the meaning set forth in the Agreement.

The undersigned Responsible Officer hereby certifies as of the date hereof that
he/she is the _________________________________________ of the Borrower, and
that, as such, he/she is authorized to execute and deliver this Certificate to
the Administrative Agent on the behalf of the Borrower, and that:

[Use following for fiscal year-end financial statements]

1. Attached hereto as SCHEDULE 1 are the year-end unaudited financial statements
required by SECTION 6.01(b) of the Agreement for the fiscal year of the Borrower
ended as of the above date. Such financial statements fairly present the
financial condition, results of operations and cash flows of the Borrower and
its Subsidiaries in accordance with GAAP as at such date and for such period,
subject only to normal year-end audit adjustments and the absence of footnotes.

2. Attached hereto as SCHEDULE 2 are the year-end audited financial statements
required by SECTION 6.01(d) of the Agreement for the fiscal year of the MLP
ended as of the above date, together with the report and opinion of an
independent certified public accountant required by such section.

[Use following for fiscal quarter-end financial statements]

1. Attached hereto as SCHEDULE 1 are the unaudited financial statements required
by SECTION 6.01(c) of the Agreement for the fiscal quarter of the Borrower ended
as of the above date. Such financial statements fairly present the financial
condition, results of operations and cash flows of the Borrower and its
Subsidiaries in accordance with GAAP as at such date and for such period,
subject only to normal year-end audit adjustments and the absence of footnotes.

2. Attached hereto as SCHEDULE 3 are the unaudited financial statements required
by SECTION 6.01(d) of the Agreement for the fiscal quarter of the MLP ended as
of the above date, together with a certificate of a Responsible Officer of the
MLP stating that such financial statements fairly present the financial
condition, results of operations and cash flows of the MLP and its Subsidiaries
in accordance with GAAP as at such date and for such period, subject only to
normal year-end audit adjustments and the absence of footnotes.

                                   Exhibit C-1
                                     Page 1
                         Form of Compliance Certificate

<PAGE>   21

[Use the following for both fiscal year-end and quarter-end financial
statements]

3. The undersigned has reviewed and is familiar with the terms of the Agreement
and has made, or has caused to be made under his/her supervision, a detailed
review of the transactions and condition (financial or otherwise) of the
Borrower during the accounting period covered by the attached financial
statements.

4. A review of the activities of the Borrower during such fiscal period has been
made under the supervision of the undersigned with a view to determining whether
during such fiscal period the Borrower performed and observed all its
Obligations under the Loan Documents, and no Default or Event of Default has
occurred and is continuing except as follows (list of each such Default or Event
of Default and include the information required by SECTION 6.03 of the Credit
Agreement):

[                          ]

5. The covenant analyses and information set forth on SCHEDULE 2 attached hereto
are true and accurate on and as of the date of this Certificate.

IN WITNESS WHEREOF, the undersigned has executed this Certificate as of
______________, ________.

                                       WILLIAMS OLP, L.P.

                                       By:   Williams GP LLC, its
                                             General Partner

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

                                   Exhibit C-1
                                     Page 2
                         Form of Compliance Certificate
<PAGE>   22

                For the Quarter/Year ended ___________________("STATEMENT DATE")

                                   SCHEDULE 2
                          to the Compliance Certificate
                                  ($ in 000's)

<Table>
<S>      <C>                                                                     <C>                <C>
I.       SECTION 2.01(a) - Acquisition Subfacility ($73,000,000)

         A.       Acquisition Subfacility Principal Debt on the first day of
                  the most recently ended fiscal quarter (the "SUBJECT
                  QUARTER"):                                                                        $__________

         B.       Borrowings under the Acquisition Subfacility during the
                  Subject Quarter (list each by the date and $ amount of the
                  Borrowing):                                                    Date               $Amount
                                                                                 ----                ------

         C.       Borrowings repaid under the Acquisition Subfacility during
                  the Subject Quarter (list each by the date and $ amount of
                  the repayment):                                                Date               $Amount
                                                                                 ----                ------

         D.       Acquisition Subfacility Principal Debt on the last day of
                  the Subject Quarter:                                                              $__________

         E.       On any day during the Subject Quarter, did the Acquisition
                  Subfacility Principal Debt exceed $73,000,000?
                                                                                                    YES/NO
II.      SECTION 2.01(b) - Working Capital/Distribution Subfacility
         ($12,000,000)

         A.       Working Capital/Distribution Subfacility Principal Debt on
                  the first day of the Subject Quarter:                                             $__________

         B.       Borrowings under the Working Capital/Distribution Subfacility
                  to fund working capital requirements of the Borrower and its
                  Subsidiaries (list each by the date and $ amount of the
                  Borrowing):                                                    Date               $Amount
                                                                                 ----                ------

         C.       Borrowings under the Working Capital/Distribution Subfacility
                  to fund Quarterly Distributions (list each by the date and
                  $ amount of the Borrowing):                                    Date               $Amount
                                                                                 ----                ------

         D.       Borrowings repaid under the Working Capital/Distribution
                  Subfacility (list each by the date and $ amount of the
                  repayment):                                                    Date               $Amount
                                                                                 ----                ------

         E.       Working Capital/Distribution Subfacility Principal Debt on
                  the last day of the Subject Quarter:                                              $_________
</Table>

                                   Exhibit C-1
                                     Page 3
                         Form of Compliance Certificate
<PAGE>   23

<Table>
<S>      <C>                                                                     <C>                <C>
         F.       On any day during the Subject Quarter, did the Working
                  Capital/Distribution Subfacility Principal Debt exceed
                  $12,000,000?                                                                      YES/NO

         G.       On the date of each Borrowing under the Working
                  Capital/Distribution Subfacility (after giving effect to
                  such Borrowing), was the undrawn amount of Working
                  Capital/Distribution Subfacility Commitment $9,000,000 or
                  more?  (SECTION 2.01(b))                                                          YES/NO

III.     SECTION 6.13 - Clean Down Period for Working Capital/Distribution
         Subfacility

         A.       One clean down period of fifteen (15) consecutive days
                  during the twelve (12) month period beginning on the Initial
                  Funding Date, and for a period of fifteen (15) consecutive
                  days each twelve (12) month period thereafter is required.
                  For the current twelve (12) month period, describe the clean
                  down period (period of consecutive days (and dates) during
                  the current twelve (12) month period that the Working
                  Capital/Distribution Subfacility Principal Debt = $0.00):
                                                                                 # of Days          Dates
                                                                                 ---------          -----
IV.      SECTION 7.03 - Indebtedness

         A.       Principal amount of purchase money indebtedness outstanding
                  (SECTION 7.03(c)):                                                                $__________

                  Maximum permitted $5,000,000

         B.       Principal amount of unsecured Indebtedness and Synthetic
                  Leases permitted pursuant to SECTION 7.03(d):

                  1.       Amount of unsecured Indebtedness:                                        $__________

                  2.       Amount of Synthetic Leases:                                              $__________

                  3.       Aggregate amount of unsecured Indebtedness and
                           Synthetic Leases under SECTION 7.03(d) (IV.B.1 +
                           IV.B.2):                                                                 $__________

                  Maximum permitted: $75,000,000.

         C.       Principal amount of Permitted Affiliated Subordinated Debt
                  outstanding (SECTION 7.03(e)):                                                    $__________

                  Maximum permitted:  $50,000,000
</Table>

                                   Exhibit C-1
                                     Page 4
                         Form of Compliance Certificate
<PAGE>   24

<Table>
<S>      <C>                                                                                        <C>
V.       SECTION 7.14(a) - Interest Coverage Ratio.

         A.       Consolidated EBITDA for the relevant period (as specified in
                  the definition of "Interest Coverage Ratio") ending on above
                  date ("SUBJECT PERIOD"):

                  1.       Consolidated Net Income for Subject Period:                              $__________

                  2.       Consolidated Interest Charges for Subject Period:                        $__________

                  3.       Provision for income taxes for Subject Period:                           $__________

                  4.       Depreciation expenses for Subject Period:                                $__________

                  5.       Amortization expenses for intangibles for Subject
                           Period:                                                                  $__________

                  6.       Consolidated EBITDA (prior to pro forma adjustments
                           for Asset Acquisitions pursuant to
                           SECTION 7.14(c)(i)) (Lines V.A.1 + 2 + 3 + 4 + 5):
                                                                                                    $__________
                  7.       Pro forma adjustments to EBITDA for Asset
                           Acquisitions during the Subject Period (SECTION
                           7.14(c)(i)), giving effect to such Asset Acquisitions
                           on a pro forma basis for the Subject Period as if
                           such Asset Acquisitions occurred on the first day of
                           the Subject Period:
                                                                                                    $__________
                  8.       Consolidated EBITDA, including pro forma
                           adjustments for Asset Acquisitions (Lines V.A.6 +
                           V.A.7):                                                                  $__________

         B.       Consolidated Interest Charges for Subject Period:

                  1.       Consolidated Interest Charges for the Subject
                           Period:
                                                                                                    $__________
                  2.       Pro forma adjustment for Interest Charges during
                           the Subject Period:
                                                                                                    $__________
                  3.       Consolidated Interest Charges, including pro forma
                           adjustments (Lines V.B.1 + V.B.2):                                       $__________
</Table>

                                   Exhibit C-1
                                     Page 5
                         Form of Compliance Certificate
<PAGE>   25

<Table>
<S>      <C>                                                                                        <C>
         C.       Consolidated Lease and Rental Expense for Subject Period:

                  1.       Consolidated Lease and Rental Expense for the
                           Subject Period:
                                                                                                    $__________
                  2.       Pro forma adjustment for Consolidated Lease and
                           Rental Expense during the Subject Period:

                                                                                                    $__________
                  3.       Consolidated Lease and Rental Expense, including
                           pro forma adjustments (Lines V.C.1 + V.C.2):                             $__________

         D.       Interest Coverage Ratio:

                  1.       Consolidated EBITDA adjusted for Asset Acquisitions
                           (Line V.A.8):                                                            $__________

                  2.       Consolidated Interest Charges adjusted for Asset
                           Acquisitions (Line V.B.3):                                               $__________

                  3.       Consolidated Lease and Rental Expense, including pro forma
                           adjustments (Line V.C.3):                                                $__________

                  4.       Interest Coverage Ratio (Line V.D.1 + Line V.D.3)
                           / (Line V.D.2 + Line V.D.3):                                             _____ to 1.0

                  Minimum required: 3.0:1.0

VI.      SECTION 7.14(b) - Leverage Ratio

         A.       Consolidated Total Debt:                                                          $__________

         B.       Permitted Affiliate Subordinated Debt:                                            $__________

         C.       Consolidated Total Debt excluding Permitted Affiliate
                  Subordinated Debt (Line VI.A minus Line VI.B):
                                                                                                    $__________

         D.       Consolidated EBITDA (including pro forma adjustments for
                  Asset Acquisitions) (Line V.A.8 above):                                           $__________

         E.       Leverage Ratio (Line VI.C / Line VI.D):                                           _____ to 1.0

                  Maximum permitted: 4.0:1.0
</Table>

                                   Exhibit C-1
                                     Page 6
                         Form of Compliance Certificate<PAGE>   1

                                                                    EXHIBIT 10.1

                                     FORM OF

             LIMITED WAIVER AND SECOND AMENDMENT TO CREDIT AGREEMENT

         THIS LIMITED WAIVER AND SECOND AMENDMENT TO CREDIT AGREEMENT (herein
called this "Amendment"), dated as of __________, 2001, is entered into by and
among The Williams Companies, Inc., a Delaware corporation, as Borrower pursuant
to the Credit Agreement (as hereinafter defined), the Banks from time to time
party to the Credit Agreement, the Co-Syndication Agents as named therein, the
Co-Documentation Agents as named therein and Citibank, N.A., as agent for the
Banks (in such capacity, the "Agent"). Except as otherwise defined or as the
context requires, terms defined in the Credit Agreement are used herein as
therein defined.

                                   WITNESSETH:

         WHEREAS, The Williams Companies, Inc. ("TWC" or the "Borrower") has
entered into a certain Credit Agreement dated as of July 25, 2000 with the
financial institutions from time to time party thereto (the "Banks"), The Chase
Manhattan Bank and Commerzbank AG, as Co-Syndication Agents, Credit Lyonnais New
York Branch, as Documentation Agent, and Citibank, N.A., as Agent (the "Original
Credit Agreement"), which Credit Agreement has been amended by a Waiver and
First Amendment to Credit Agreement dated as of January 31, 2001 (the Original
Credit Agreement, as so amended, the "Credit Agreement");

         WHEREAS, the Borrower and the Banks now desire to amend the Credit
Agreement in certain respects, as hereinafter provided;

         WHEREAS, the Borrower has requested waivers of certain provisions of
the Credit Agreement; and

         WHEREAS, the Banks wish to name Bank of America, N.A. and Credit
Lyonnais as Co-Documentation Agents and to replace the Documentation Agent with
the Co-Documentations for purposes of the Credit Agreement and each document
related thereto;

         NOW, THEREFORE, in consideration of the premises and the mutual
agreements herein contained, the Borrower and the Banks hereby agree as follows:

         SECTION 1. Amendment of Section 1.1 of the Credit Agreement. Section
1.1 of the Credit Agreement is hereby amended as follows:

                  (a) The following definitions of "B of A" and
"Co-Documentation Agent" are added to such Section 1.1 in appropriate
alphabetical order:

                  "B of A" means Bank of America, National Association.

                  "Co-Documentation Agent" means either of B of A or Credit
         Lyonnais, together with the successors and assigns of each in such
         capacity.

<PAGE>   2

                  (b) The definition of "Commitment" in such Section 1.1 is
hereby amended and restated to read in its entirety as follows:

                  "Commitment" of any Bank means at any time the amount set
         opposite such Bank's name on Schedule IV or as reflected for such Bank
         in the relevant Transfer Agreement to which it is a party, as such
         amount may be terminated, reduced or increased after the date hereof
         pursuant to Section 2.4, Section 2.17, Section 6.1 or Section 8.6(a).

                  (c) The definition of "Consolidated" in such Section 1.1 is
hereby amended and restated to read in its entirety as follows:

                  "Consolidated" refers to the consolidation of the accounts of
         any Person and its subsidiaries in accordance with generally accepted
         accounting principles.

                  (d) The definition of "Consolidating" in such Section 1.1 is
hereby deleted in its entirety.

                  (e) The definition of "Designated Minority Interests" in such
Section 1.1 is hereby amended and restated to read in its entirety as follows:

                  "Designated Minority Interests" of the Borrower means, as of
         any date of determination, the total of the minority interests in the
         following Subsidiaries: (i) El Furrial, (ii) PIGAP II, (iii) Nebraska
         Energy, (iv) Seminole, (v) American Soda, (vi) the Midstream Asset MLP,
         and (vii) other Subsidiaries, as presented in the Consolidated balance
         sheet of the Borrower, in an amount not to exceed in the aggregate
         $9,000,000 for such other Subsidiaries not referred to in items (i)
         through (vi); provided that minority interests which provide for a
         stated preferred cumulative return shall not be included in "Designated
         Minority Interests."

                  (f) The definition of "Designating Bank" in such Section 1.1
is amended and restated in its entirety to read as follows:

                  "Designating Bank" has the meaning specified in Section
8.6(g).

                  (g) The definition of "Documentation Agent" in such Section
1.1 is hereby deleted.

                  (h) The definition of "Domestic Lending Office" in such
Section 1.1 is amended and restated in its entirety to read as follows:

                  "Domestic Lending Office" means, with respect to any Bank, the
         office of such Bank specified as its "Domestic Lending Office" opposite
         its name on Schedule I hereto or in the relevant Transfer Agreement
         delivered pursuant to Section 8.6(a), or such other office of such Bank
         as such Bank may from time to time specify to the Borrower and the
         Agent.

                                       2
<PAGE>   3

                  (i) The following definition of "Eligible Assignee" is added
to Section 1.1 of the Credit Agreement in appropriate alphabetical order:

                  "Eligible Assignee" means (i) any Bank, (ii) any affiliate of
         any Bank, and (iii) any other Person not covered by clause (i) or (ii)
         of this definition (A) so long as no Event of Default has occurred and
         is continuing, with the consent of the Borrower and the Agent (which
         consent shall not be unreasonably withheld) or (B) if any Event of
         Default has occurred and is continuing, without any requirement for
         consent by the Agent or the Borrower; provided, however, that neither
         the Borrower nor any affiliate of the Borrower shall be an Eligible
         Assignee.

                  (j) The definition of "Eurodollar Lending Office" in such
Section 1.1 of the Credit Agreement is amended and restated to read in its
entirety, as follows:

                  "Eurodollar Lending Office" means, with respect to any Bank,
         the office of such Bank specified as its "Eurodollar Lending Office"
         opposite its name on Schedule I hereto or in the relevant Transfer
         Agreement delivered pursuant to Section 8.6(a) (or, if no such office
         is specified, its Domestic Lending Office) or such other office of such
         Bank as such Bank may from time to time specify to the Borrower and the
         Agent.

                  (k) The following definition of "Register" is added to Section
1.1 of the Credit Agreement in appropriate alphabetical order:

                  "Register" shall mean the books and accounts maintained by the
         Agent of the interests of each Bank under this Agreement and its
         Commitments and Advances, including records of transfers of any
         interests in this Agreement and the Commitment and Advances (if any) of
         any Bank pursuant to Section 8.6 and the records maintained by the
         Agent pursuant to Section 2.9.

                  (l) The definition of "SPC" in such Section 1.1 is hereby
amended and restated to read in its entirety as follows:

                  "SPC" has the meaning specified in Section 8.6(g).

                  (m) The definition of "Subsidiary" in such Section 1.1 is
hereby amended and restated in its entirety to read as follows:

                  "Subsidiary" of any Person means any corporation, partnership,
         joint venture or other entity of which more than 50% of the outstanding
         capital stock or other equity interests having ordinary voting power to
         elect a majority of the board of directors of such corporation,
         partnership, joint venture or other entity or others performing similar
         functions (irrespective of whether or not at the time capital stock or
         other equity interests of any other class or classes of such
         corporation, partnership, joint venture or other entity shall or might
         have voting power upon the occurrence of any contingency) is at the
         time directly or indirectly owned by such Person.

                                       3
<PAGE>   4

                  (n) The definition of "Transfer Agreement" in such Section 1.1
is amended and restated in its entirety to read as follows:

                  "Transfer Agreement" means an agreement executed pursuant to
         Section 8.6 by an assignor Bank and assignee Bank substantially in the
         form of Exhibit F, which agreement shall be executed by the Borrower
         and the Agent to evidence the consent of each if such consent is
         required pursuant to the terms of Section 8.6.

         SECTION 2. Amendment of Section 2.11. Clause (c) of Section 2.11 of the
Credit Agreement is hereby amended by replacing the phrase "all of the
provisions of the last sentence of Section 8.6(a)" in such clause (c) with the
phrase "all of the provisions of the second and third sentences of Section
8.6(a), and clauses (b) and (d) of Section 8.6."

         SECTION 3. Amendment of Section 4.1(e). Section 4.1(e) of the Credit
Agreement is hereby amended and restated in its entirety to read as follows:

                  (e) The Consolidated balance sheets of the Borrower and its
         Subsidiaries as at December 31, 2000, and the related Consolidated
         statements of income and cash flows of the Borrower and its
         Subsidiaries for the fiscal year then ended, copies of which have been
         furnished to each Bank, and the Consolidated balance sheet of the
         Borrower and its Subsidiaries as at March 31, 2001, and the related
         Consolidated statements of income and cash flows of the Borrower and
         its Subsidiaries for the three months then ended, duly certified by an
         authorized financial officer of the Borrower, copies of which have been
         furnished to each Bank, fairly present, (in the case of such balance
         sheets as at March 31, 2001, and such statements of income and cash
         flows for the three months then ended, subject to year-end audit
         adjustments) the Consolidated financial condition of the Borrower and
         its Subsidiaries as at such dates and the Consolidated results of
         operations of the Borrower and its Subsidiaries for the year and three
         month period, respectively, ended on such dates, all in accordance with
         generally accepted accounting principles consistently applied. Since
         March 31, 2001, there has been no material adverse change in the
         condition or operations of the Borrower or its Subsidiaries.

         SECTION 4. Amendment of Section 4.1(h). The last sentence of Section
4.1(h) of the Credit Agreement is hereby amended by deleting the parenthetical
"(including the WCG Subsidiaries)" therefrom.

         SECTION 5. Amendment of Section 4.1(j). Section 4.1(j) of the Credit
Agreement is hereby amended by deleting the parenthetical "(including any
material WCG Subsidiaries)" wherever it appears in such Section.

                                       4
<PAGE>   5

         SECTION 6. Amendment of Section 4.1(k). The first sentence of Section
4.1(k) of the Credit Agreement is hereby amended to read in its entirety as
follows: "As of July ___, 2001, the United States federal income tax returns of
the Borrower and its material Subsidiaries have been examined through the fiscal
year ended December 31, 1993."

         SECTION 7. Amendment of Section 4.1(m). Section 4.1(m) of the Credit
Agreement is hereby amended by deleting the last sentence thereof.

         SECTION 8. Amendment of Section 5.1(b)(ii). Section 5.1(b)(ii) of the
Credit Agreement is hereby amended and restated in its entirety as follows:

                  (ii) as soon as available and in any event not later than 60
         days after the end of each of the first three quarters of each fiscal
         year of the Borrower, the Consolidated balance sheets of the Borrower
         and its Subsidiaries as of the end of such quarter and the Consolidated
         statements of income and cash flows of the Borrower and its
         Subsidiaries for the period commencing at the end of the previous year
         and ending with the end of such quarter, all in reasonable detail and
         duly certified (subject to year-end audit adjustments) by an authorized
         financial officer of the Borrower as having been prepared in accordance
         with generally accepted accounting principles; provided that, if any
         financial statement referred to in this clause (ii) of Section 5.1(b)
         is readily available on-line through EDGAR, the Borrower shall not be
         obligated to furnish copies of such financial statement. An authorized
         financial officer of the Borrower shall furnish a certificate (a)
         stating that he has no knowledge that an Event of Default, or an event
         which, with notice or lapse of time or both, would constitute an Event
         of Default has occurred and is continuing or, if an Event of Default or
         such an event has occurred and is continuing, a statement as to the
         nature thereof and the action, if any, which the Borrower proposes to
         take with respect thereto, and (b) showing in detail the calculation
         supporting such statement in respect of Section 5.2(b).

         SECTION 9. Amendment of Section 5.1(b)(iii). Section 5.1(b)(iii) of the
Credit Agreement is hereby amended and restated in its entirety as follows:

                  (iii) as soon as available and in any event not later than 105
         days after the end of each fiscal year of the Borrower, a copy of the
         annual audit report for such year for the Borrower and its
         Subsidiaries, including therein Consolidated balance sheets of the
         Borrower and its Subsidiaries as of the end of such fiscal year and
         Consolidated statements of income and cash flows of the Borrower and
         its Subsidiaries for such fiscal year, in each case prepared in
         accordance with generally accepted accounting principles and certified
         by Ernst & Young, LLP or other independent certified public accountants
         of recognized standing acceptable to the Majority Banks; provided that
         if any financial statement referred to in this clause (iii) of Section
         5.1(b) is readily available on-line through EDGAR, the Borrower shall
         not be obligated to furnish copies of such financial statement. The
         Borrower shall also deliver in conjunction with such financial
         statements, a certificate of such accounting firm to the Banks (a)
         stating that, in the course of the regular audit of the business of the
         Borrower and its Subsidiaries, which audit

                                       5
<PAGE>   6

         was conducted by such accounting firm in accordance with generally
         accepted auditing standards, such accounting firm has obtained no
         knowledge that an Event of Default or an event which, with notice or
         lapse of time or both, would constitute an Event of Default, has
         occurred and is continuing, or if, in the opinion of such accounting
         firm, an Event of Default or such an event has occurred and is
         continuing, a statement as to the nature thereof, and (b) showing in
         detail the calculations supporting such statement in respect of Section
         5.2(b).

         SECTION 10. Amendment of Section 5.1(b)(vi). Section 5.1(b)(vi) of the
Credit Agreement is hereby amended and restated in its entirety as follows:

                  (vi) as soon as possible and in any event within 30 Business
         Days after the Borrower or any ERISA Affiliate knows or has reason to
         know (A) that any Termination Event described in clause (i) of the
         definition of Termination Event with respect to any Plan has occurred
         that could have a material adverse effect on the Borrower or any
         material Subsidiary of the Borrower or any ERISA Affiliate or (B) that
         any other Termination Event with respect to any Plan has occurred or is
         reasonably expected to occur that could have a material adverse effect
         on the Borrower or any material Subsidiary of the Borrower or any ERISA
         Affiliate, a statement of the chief financial officer or chief
         accounting officer of the Borrower describing such Termination Event
         and the action, if any, which the Borrower or such Subsidiary or ERISA
         Affiliate proposes to take with respect thereto;

         SECTION 11. Amendment of Section 5.2(g) of the Credit Agreement.
Section 5.2(g) of the Credit Agreement is hereby amended by deleting the
parenthetical "(including any material WCG Subsidiary)" in each of clauses (i)
and (ii) thereof.

         SECTION 12. Amendment of Section 7.2. Clause (i) of Section 7.2 of the
Credit Agreement is hereby amended by replacing the reference to "the last
sentence of Section 8.6(a)" in such clause (i) with a reference to "the second
and third sentences of Section 8.6(a)."

         SECTION 13. Amendment of Section 8.2. Section 8.2 is hereby amended by
replacing the phrase "specified pursuant to Section 8.6(a)" each time it appears
therein with "specified in a Transfer Agreement for any assignee Bank delivered
pursuant to Section 8.6(a)."

         SECTION 14. Amendment of Section 8.6. Clause (d) of Section 8.6 of the
Credit Agreement is redesignated clause (g). Clauses (a) through (c) of Section
8.6 of the Credit Agreement shall be amended, restated and replaced in their
entirety as follows:

                  SECTION 8.6 Binding Effect; Transfers. (a) This Agreement
         shall become effective when it shall have been executed by the
         Borrower, the Co-Syndication Agents, Credit Lyonnais in its former
         capacity as the documentation agent and the Agent and when each Bank
         listed on the signature pages hereof has delivered an executed
         counterpart hereof to the Agent, has sent to the Agent a facsimile copy
         of its signature hereon or has notified the Agent that such Bank has
         executed this Agreement and thereafter shall be binding upon and inure
         to the benefit of the Borrower, the Agent and each Bank and their
         respective successors

                                       6
<PAGE>   7

         and assigns; provided that the Borrower shall not have the right to
         assign any of its rights hereunder or any interest herein without the
         prior written consent of all of the Banks. Each Bank may assign to one
         or more banks, financial institutions or other entities all or a
         portion of its rights and obligations under this Agreement (including,
         without limitation, all or a portion of its Commitments, the Advances
         owing to it and any Note or Notes held by it); provided, however, that
         (i) each such assignment shall be of a constant, and not a varying,
         percentage of all rights and obligations under this Agreement, (ii)
         except in the case of an assignment of all of a Bank's rights and
         obligations under this Agreement or an assignment to another Bank, the
         amount of the Commitment of the assigning Bank being assigned pursuant
         to each such assignment (determined as of the date of the Transfer
         Agreement with respect to such assignment) shall in no event be less
         than $10,000,000 in the aggregate or such lesser amount as may be
         consented to by the Agent and the Borrower, (iii) each such assignment
         shall be to an Eligible Assignee, and (iv) the parties to each such
         assignment shall execute and deliver to the Agent, for its acceptance
         and recording in the Register maintained by the Agent, a Transfer
         Agreement together with any Note or Notes subject to such assignment
         and, unless the assignment is to an affiliate of such Bank, a
         processing and recordation fee of $3,500. Upon such execution,
         delivery, acceptance and recording, from and after the effective date
         specified in each Transfer Agreement, (x) the assignee thereunder shall
         be a party hereto and, to the extent that rights and obligations
         hereunder have been assigned to it pursuant to such Transfer Agreement,
         have the rights and obligations of a Bank hereunder (including, without
         limitation, obligations to the Agent pursuant to Section 7.5) and (y)
         the Bank assignor thereunder shall, to the extent that rights and
         obligations hereunder have been assigned by it pursuant to such
         Transfer Agreement, relinquish its rights and be released from its
         obligations under this Agreement, except for rights and obligations
         which continue after repayment of the Advances or termination of the
         Agreement pursuant to the express terms of this Agreement (and, in the
         case of a Transfer Agreement covering all of an assigning Bank's rights
         and obligations under this Agreement, such Bank shall cease to be a
         party hereto).

                  (b) By executing and delivering a Transfer Agreement, the Bank
         assignor thereunder and the assignee thereunder confirm to and agree
         with each other and the other parties hereto as follows: (i) other than
         as provided in such Transfer Agreement, such assigning Bank makes no
         representation or warranty and assumes no responsibility with respect
         to any statements, warranties or representations (whether written or
         oral) made in or in connection with this Agreement, any Note or Notes
         or any other instrument or document furnished pursuant hereto or in
         connection herewith or the execution, legality, validity,
         enforceability, genuineness, sufficiency or value of this Agreement,
         any Note or Notes or any other instrument or document furnished
         pursuant hereto or in connection herewith; (ii) such assigning Bank
         makes no representation or warranty and assumes no responsibility with
         respect to the financial condition of the Borrower or any other Person
         or the performance or observance by the Borrower or any other Person of
         any of its respective obligations under this

                                       7
<PAGE>   8

         Agreement, any Note or Notes or any other instrument or document
         furnished pursuant hereto or in connection herewith; (iii) such
         assignee confirms that it has received a copy of this Agreement,
         together with copies of the financial statements and such other
         documents and information as it has deemed appropriate to make its own
         credit analysis and decision to enter into such Transfer Agreement;
         (iv) such assignee will, independently and without reliance upon the
         Agent, such assigning Bank or any other Bank and based on such
         financial statements and such other documents and information as it
         shall deem appropriate at the time, continue to make its own credit
         analysis and decisions in taking or not taking action under this
         Agreement, any Note or Notes or any other instrument or document; (v)
         such assignee confirms that it is an Eligible Assignee; (vi) such
         assignee appoints and authorizes the Agent to act as Agent on its
         behalf and to exercise such powers and discretion under the Agreement,
         any Note or Notes or any other document executed in connection herewith
         or therewith as are delegated to the Agent by the terms hereof or
         thereof, together with such powers and discretion as are reasonably
         incidental thereto; and (vii) such assignee agrees that it will perform
         in accordance with their terms all of the obligations which by the
         terms of this Agreement are required to be performed by it as a Bank.

                  (c) The Agent shall maintain at its address referred to in
         Section 2.13(a) a copy of each Transfer Agreement, delivered to and
         accepted by it and the Register for the recordation of the names and
         addresses of the Banks and the Commitment of, and the principal amount
         of the Advances owing to, each Bank from time to time.

                  (d) Upon its receipt of a Transfer Agreement executed and
         completed by an assigning Bank and an assignee representing that it is
         an Eligible Assignee (and, if required, consented to by the Borrower),
         the Agent shall (i) accept such Transfer Agreement, (ii) record the
         information contained therein in the Register and (iii) give prompt
         notice thereof to the Borrower. Within five Business Days after its
         receipt of such notice and the request of the assigning Bank and/or
         Eligible Assignee, the Borrower shall deliver, in replacement of any A
         Note of the Borrower then outstanding which may have been executed to
         the order of such assigning Bank or as may be requested by the assignee
         or the assigning Bank (A) to such assignee upon its request or as
         required by Section 2.9, a new A Note of the Borrower in the amount of
         the Commitment of such assigning Bank which is being so assumed by such
         assignee plus, in the case of any assignee which is already a Bank
         hereunder, the amount of such assignee's Commitment immediately prior
         to such assignment (any such assignee which is already a Bank hereunder
         agrees to mark "Exchanged" and return to the Borrower, with reasonable
         promptness following the delivery of such new A Note, any A Note being
         replaced thereby, if any), (B) to such assigning Bank as required by
         Section 2.9, a new A Note in the amount of the balance, if any, of the
         Commitment of such assigning Bank to the Borrower (without giving
         effect to any B Reduction) retained by such assigning Bank (and such
         assigning Bank agrees to mark

                                       8
<PAGE>   9

         "Exchanged" and return to the Borrower, with reasonable promptness
         following delivery of such new A Notes, the A Note being replaced
         thereby), and (C) to the Agent, photocopies of such new A Notes, if
         any.

                  (e) Each Bank may sell participations to one or more banks or
         other entities (other than the Borrower or any of its Affiliates) in or
         to all or a portion of its rights and obligations under this Agreement
         (including, without limitation, all or a portion of its Commitment, the
         Advances owing to it and any Note or Notes held by it); provided,
         however, that (i) such Bank's obligations under this Agreement
         (including without limitation, its Commitment to the Borrower
         hereunder) shall remain unchanged, (ii) such Bank shall remain solely
         responsible to the other parties hereto for the performance of such
         obligations, (iii) such Bank shall remain the holder of any such Note
         or any Notes for all purposes of this Agreement, (iv) the Borrower, the
         Agent and the other Banks shall continue to deal solely and directly
         with such Bank in connection with such Bank's rights and obligations
         under this Agreement, (v) all amounts payable under this Agreement
         shall be calculated as if such Bank had not sold such participation,
         and (vi) the terms of any such participation shall not restrict such
         Bank's ability to consent to any departure by the Borrower therefrom
         without the approval of the participant, except that the approval of
         the participant may be required to the extent that such amendment,
         waiver or consent would reduce the principal of, or interest on, the
         Advances or any fees or other amounts payable hereunder, in each case
         to the extent subject to such participation, or postpone any date fixed
         for any payment of principal of, or interest on, the Advances or any
         fees or other amounts payable hereunder, in each case to the extent
         subject to such participation.

                  (f) Notwithstanding any other provisions set forth in this
         Agreement, any Bank may at any time create a security interest in all
         or any portion of its rights under this Agreement (including, without
         limitation, the Advances owing to it and the Note or Notes held by it)
         in favor of any Federal Reserve Bank in accordance with Regulation A of
         the Federal Reserve Board.

         SECTION 15. Replacement of Schedule IV; Addition of New Banks, etc. (a)
Schedule IV of the Credit Agreement is hereby amended and restated in its
entirety to read as set forth in Section IV hereto.

                  (b) The Commitments of DG Bank have terminated effective as of
July 24, 2001, and as of such date such Bank shall not have any further
obligation to make any Advance. Upon payment in full of all amounts owed to DG
Bank by the Borrower in accordance with the terms and conditions of this
Agreement and any Note or Notes issued by the Borrower to such Bank, DG Bank
shall not have any rights or obligations under the Credit Agreement, any Note or
Notes or other documents executed pursuant to the Credit Agreement except for
those rights and obligations which, by the express terms of the Credit
Agreement, continue after repayment in full of the obligations of the Borrower
to any Bank.

                  (c) Each of United Missouri Bank, Lehman Brothers and Merrill
Lynch Corporation (each a "New Bank" and collectively, the "New Banks"), by its
signature to this

                                       9
<PAGE>   10

Amendment, agrees to become, and is hereby deemed to be a Bank pursuant to the
terms of the Credit Agreement and any other documents executed pursuant thereto,
with a Commitment in the amount shown on Schedule IV to this Amendment. Each New
Bank agrees that (i) none of the Agent, the Co-Syndication Agents, the
Co-Documentation Agents, the Arranger or any Bank has made any representation or
warranty or assumed any responsibility with respect to any statements,
warranties or representations, whether written or oral, made in or in connection
with the Credit Agreement, any Note or Notes or any other instrument or document
furnished pursuant hereto or thereto or in connection herewith or therewith or
the execution, legality, validity, enforceability, genuineness, sufficiency or
value of the Credit Agreement, any Note or Notes or any other instrument or
document furnished pursuant hereto or thereto or in connection herewith; (ii)
none of the Agent, the Co-Syndication Agents, the Co-Documentation Agents, the
Arranger or any Bank makes any representation or warranty or assumes any
responsibility with respect to the financial condition of the Borrower or any
other Person or the performance or observance by the Borrower or any other
Person of any of its respective obligations under the Credit Agreement, any Note
or Notes or any other instrument or document furnished pursuant thereto or in
connection therewith; (iii) such New Bank confirms that it has received a copy
of the Credit Agreement, together with copies of the financial statements and
such other documents and information as it has deemed appropriate to make its
own credit analysis and decision to enter into the Credit Agreement; (iv) such
New Bank will, independently and without reliance upon the Agent, or any Bank
and based on such documents and information as it shall deem appropriate at the
time, continue to make its own credit decisions in taking or not taking action
under the Credit Agreement, any Note or Notes or any other instrument or
document; (v) such New Bank appoints and authorizes the Agent to act as Agent on
its behalf and to exercise such powers and discretion under the Credit
Agreement, any Note or Notes or any other instrument or document furnished
pursuant to the Credit Agreement as are delegated to the Agent by the terms
thereof, together with such powers and discretion as are reasonably incidental
thereto; and (vi) such New Bank agrees that it will perform in accordance with
their terms all of the obligations which by the terms of the Credit Agreement,
any Note or Notes or any other instrument or document furnished pursuant to the
Credit Agreement are required to be performed by it as a Bank.

         After giving effect to this Amendment, the Commitment of each Bank
shall be as shown on Schedule IV hereto, effective as of July 24, 2001 and the
aggregate total of all such Commitments is $2,200,000,000.

         SECTION 16. Extension of Stated Termination Date. Pursuant to Section
2.18 of the Credit Agreement, each of the Banks executing below agrees that the
Stated Termination Date shall be extended to July 23, 2002.

         SECTION 17. Replacement of Documentation Agent. Each Bank hereby
designates each of B of A and Credit Lyonnais as a Co-Documentation Agent and B
of A and Credit Lyonnais hereby accept such designation. Each of the
Co-Documentation Agents and the Banks agrees that the Co-Documentation Agents
shall replace the Documentation Agent for all purposes related to the Credit
Agreement, the Notes and any other instrument or document related thereto. Each
reference to the Documentation Agent in the Credit Agreement (including in the
preface, recitals and any schedule or exhibit), any Note or any other document
or

                                       10
<PAGE>   11

instrument related to the Credit Agreement shall be deemed to be a reference to
the Co-Documentation Agents.

         SECTION 18. Limited Waiver of Section 5.2(e). The Borrower has
requested the waiver of, and each Bank by its signature hereby agrees to waive,
Section 5.2(e) of the Credit Agreement for and in connection with the following:

                  (a) WCG and/or one or more of the Subsidiaries thereof owns
the assets described on Annex A hereto. TWC anticipates that it or one of its
Subsidiaries may enter into a Sale Lease-Back Transaction in which TWC or one of
its Subsidiaries will purchase the assets described on Annex A and then lease
such assets to WCG or a WCG Subsidiary. TWC hereby covenants that such
transaction shall be entered into on terms and conditions reasonably fair in all
material respects to TWC and its Subsidiaries. To the extent that such Sale
Lease-Back Transaction may be, or may be deemed to be, an investment in WCG or a
WCG Subsidiary, such transaction is prohibited by Section 5.2(e) of the Credit
Agreement.

         In connection with such Sale Lease-Back Transaction, and only for
purposes of such transactions, TWC requests that the Banks waive the provisions
of Section 5.2(e) of the Credit Agreement to allow TWC and/or its Subsidiaries
to effect the Sale Lease-Back Transaction, described in the preceding paragraph.
Nothing herein shall, or shall be deemed to, waive the provisions of Section
5.2(j) of the Credit Agreement, or any other provisions of the Credit Agreement
applicable to the Sale Lease-Back Transaction, except as expressly set forth
above with respect to Section 5.2(e) thereof.

         By its signature hereto, each Bank agrees to waive and does hereby
waive Section 5.2(e) (and only Section 5.2(e)) of the Credit Agreement to allow,
and only to the extent necessary to allow, TWC and its Subsidiaries to acquire
the assets described on Annex A and to act as lessor pursuant to the Sale
Lease-Back Transaction described above involving such assets.

         SECTION 19. Representations and Warranties. To induce the Agent and the
Banks to enter into this Amendment, the Borrower hereby reaffirms, as of the
date hereof, its representations and warranties contained in Article IV of the
Credit Agreement (except to the extent such representations and warranties
relate solely to an earlier date) and additionally represents and warrants as
follows:

                  (a) The Borrower is duly organized, validly existing and in
good standing under the laws of the State of Delaware and has all corporate or
limited liability company powers and all governmental licenses, authorizations,
certificates, consents and approvals required to carry on its business as now
conducted in all material respects, except for those licenses, authorizations,
certificates, consents and approvals which the failure to have could not
reasonably be expected to have a material adverse effect on the business,
assets, condition or operation of the Borrower and its Subsidiaries taken as a
whole. Each material Subsidiary of the Borrower is duly organized or validly
formed, validly existing and (if applicable) in good standing under the laws of
its jurisdiction of incorporation or formation, except where the failure to be
so organized, existing and in good standing could not reasonably be expected to
have a material adverse effect on the business, assets, condition or operations
of the Borrower and its Subsidiaries taken as a whole. Each material Subsidiary
of the Borrower has all corporate or

                                       11
<PAGE>   12

limited liability company powers and all governmental licenses, authorizations,
certificates, consents and approvals required to carry on its business as now
conducted in all material respects, except for those licenses, authorizations,
certificates, consents and approvals which the failure to have could not
reasonably be expected to have a material adverse effect on the business,
assets, condition or operation of the Borrower and its Subsidiaries taken as a
whole.

                  (b) The execution, delivery and performance by the Borrower of
this Amendment and the consummation of the transactions contemplated by this
Amendment are within the Borrower's corporate powers, have been duly authorized
by all necessary corporate action, do not contravene (i) the Borrower's charter
or by-laws or (ii) any law or any contractual restriction binding on or
affecting the Borrower and will not result in or require the creation or
imposition of any Lien.

                  (c) No authorization or approval or other action by, and no
notice to or filing with, any governmental authority or regulatory body is
required for the due execution, delivery and performance by the Borrower of this
Amendment or the consummation of the transactions contemplated by this
Amendment.

                  (d) This Amendment has been duly executed and delivered by the
Borrower. This Amendment and the Credit Agreement as amended by this Amendment
are the legal, valid and binding obligations of the Borrower enforceable against
the Borrower in accordance with its terms, except as such enforceability may be
limited by any applicable bankruptcy, insolvency, reorganization, moratorium or
similar law affecting creditors' rights generally and by general principles of
equity.

                  (e) Except as set forth in the Public Filings, there is, as to
the Borrower, no pending or, to the knowledge of the Borrower, threatened action
or proceeding affecting the Borrower or any material Subsidiary of the Borrower
before any court, governmental agency or arbitrator, which could reasonably be
expected to materially and adversely affect the financial condition or
operations of the Borrower and its Subsidiaries taken as a whole or which
purports to affect the legality, validity, binding effect or enforceability of
this Amendment, the Credit Agreement or any Note. For the purposes of this
Section, "Public Filings" shall mean the Borrower's annual report on Form 10-K
for the year ended December 31, 2000, and the Borrower's quarterly reports on
Form 10-Q for the quarter ended March 31, 2001.

                  (f) Upon giving effect to this Amendment, no event has
occurred and is continuing which constitutes an Event of Default or which would
constitute an Event of Default but for the requirement that notice be given or
time elapse or both.

         SECTION 20. Conditions to Effectiveness. The effectiveness of this
Amendment is conditioned upon receipt by the Agent of all the following
documents, each in form and substance satisfactory to the Agent:

                  (a) Counterparts of this Amendment executed by the Borrower,
the Agent and each of the Banks;

                                       12
<PAGE>   13

                  (b) A certificate of the Secretary or Assistant Secretary of
the Borrower as to (i) any changes (or the absence of changes) since July 25,
2000 to its certificate of incorporation and its by-laws as of the date hereof,
(ii) the resolutions of the Borrower authorizing the execution of this Amendment
and (iii) the names and true signatures of the officers authorized to execute
this Amendment;

                  (c) An opinion of William G. von Glahn, General Counsel of the
Borrower, substantially in the form of Exhibit A hereto; and

                  (d) Such other documents as the Agent shall have reasonably
requested.

         SECTION 21. Effect. This Amendment shall be deemed to be an amendment
to the Credit Agreement, and the Credit Agreement, as amended hereby, is hereby
ratified, approved and confirmed in each and every respect. All references to
the Credit Agreement in any other document, instrument, agreement or writing
shall hereafter be deemed to refer to the Credit Agreement as amended hereby.

         SECTION 22. Governing Law, Etc. THIS AMENDMENT SHALL BE A CONTRACT MADE
UNDER AND GOVERNED BY THE INTERNAL LAWS OF THE STATE OF NEW YORK. Whenever
possible each provision of this Amendment shall be interpreted in such manner as
to be effective and valid under applicable law, but if any provision of this
Amendment shall be prohibited by or invalid under applicable 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
Amendment.

         SECTION 23. Counterpart Execution. This Amendment may be executed in
any number of counterparts, all of which taken together shall constitute one and
the same instrument, and any party hereto may execute this Amendment by signing
one or more counterparts.

         SECTION 24. Successors and Assigns. This Amendment shall be binding
upon the Borrower, the Agent and the Banks and their respective successors and
assigns, and shall inure to the benefit of each of the Borrower, the Agent and
the Banks and the successors and assigns of the Banks.

                                       13
<PAGE>   14

         IN WITNESS WHEREOF, the parties have caused this Amendment to be
executed by their respective officers thereunto duly authorized, to be effective
as of the date first written above.

                                    BORROWER:

                                    THE WILLIAMS COMPANIES, INC.

                                    By:
                                       -----------------------------------------
                                       Name:  James G. Ivey
                                       Title: Treasurer

                                    AGENT:

                                    CITIBANK, N.A., as Agent

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    CO-SYNDICATION AGENTS:

                                    THE CHASE MANHATTAN BANK,
                                    as Co-Syndication Agent

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    COMMERZBANK AG, as Co-Syndication Agent

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                      S-1
<PAGE>   15

                                    CO-DOCUMENTATION AGENTS:

                                    CREDIT LYONNAIS NEW YORK BRANCH,
                                    as Co-Documentation Agent and as a Bank

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    BANK OF AMERICA,
                                    as Co-Documentation Agent and as a Bank

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    BANKS:

                                    CITIBANK, N.A.

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    THE BANK OF NOVA SCOTIA

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                      S-2
<PAGE>   16

                                    BANK ONE, NA (CHICAGO)

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    THE CHASE MANHATTAN BANK

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    COMMERZBANK AG,
                                    NEW YORK AND GRAND CAYMAN BRANCHES

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    CREDIT LYONNAIS NEW YORK BRANCH

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                      S-3
<PAGE>   17

                                    THE FUJI BANK, LIMITED

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    NATIONAL WESTMINSTER BANK PLC
                                    NEW YORK BRANCH

                                    By:
                                       -----------------------------------------
                                    Name:
                                         ---------------------------------------
                                    Title:
                                          --------------------------------------
                                    Date:                                 , 2001
                                         ---------------------------------

                                    NATIONAL WESTMINSTER BANK PLC
                                    NASSAU BRANCH

                                    By:
                                       -----------------------------------------
                                    Name:
                                         ---------------------------------------
                                    Title:
                                          --------------------------------------
                                    Date:                                 , 2001
                                         ---------------------------------

                                    ABN AMRO BANK, N.V.

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                      S-4
<PAGE>   18

                                    BANK OF MONTREAL

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    THE BANK OF NEW YORK

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    BARCLAYS BANK PLC

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    CIBC INC.

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                      S-5
<PAGE>   19

                                    CREDIT SUISSE FIRST BOSTON

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    ROYAL BANK OF CANADA

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    THE BANK OF TOKYO-MITSUBISHI, LTD.,
                                    HOUSTON AGENCY

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    FLEET NATIONAL BANK
                                    f/k/a Bank Boston, N.A.

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                      S-6
<PAGE>   20

                                    SOCIETE GENERALE, SOUTHWEST AGENCY

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    THE INDUSTRIAL BANK OF JAPAN TRUST COMPANY

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    TORONTO DOMINION (TEXAS), INC.

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    UBS AG, STAMFORD BRANCH

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                      S-7
<PAGE>   21

                                    WELLS FARGO BANK TEXAS, N.A.

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    WESTDEUTSCHE LANDESBANK GIROZENTRALE,
                                    NEW YORK BRANCH

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    CREDIT AGRICOLE INDOSUEZ

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    SUNTRUST BANK

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                      S-8
<PAGE>   22

                                    THE DAI-ICHI KANGYO BANK, LTD.

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    ARAB BANKING CORPORATION (B.S.C.)

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    BANK OF CHINA, NEW YORK BRANCH

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    BANK OF OKLAHOMA, N.A.

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                      S-9
<PAGE>   23

                                    BNP PARIBAS, HOUSTON AGENCY

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    DG BANK DEUTSCHE
                                    GENNOSSENSCHAFTSBANK AG

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    KBC BANK N.V.

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    SUMITOMO MITSUI BANKING CORPORATION

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                      S-10
<PAGE>   24

                                    COMMERCE BANK, N.A.

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    RZB FINANCE LLC

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    FIRST UNION NATIONAL BANK

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    UNITED MISSOURI BANK

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                      S-11
<PAGE>   25

                                    MERRILL LYNCH CORPORATION

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    LEHMAN BROTHERS

                                    By:
                                       -----------------------------------------
                                                  Authorized Officer

                                    Date:                                 , 2001
                                         ---------------------------------

                                    Executed for purposes of acknowledging
                                    Section 15(b) only:

                                    DG BANK

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

                                      S-12
<PAGE>   26

                                   SCHEDULE IV

                                   COMMITMENTS

                             AS OF           , 2001
                                   ----------

<Table>
<Caption>
BANKS                                                                             COMMITMENT
<S>                                                                               <C>
Bank of America, N.A.
The Bank of Nova Scotia
Bank One, NA
The Chase Manhattan Bank
Citibank, N.A.
Commerzbank AG
Credit Lyonnais
The Fuji Bank, Limited
National Westminster Bank PLC
ABN Amro Bank N.V.
Bank of Montreal
The Bank of New York
Barclays Bank PLC
CIBC Inc.
Credit Suisse First Boston
Royal Bank of Canada
The Bank of Tokyo-Mitsubishi, Ltd.
Fleet National Bank
Societe Generale
The Industrial Bank of Japan Trust Company
Toronto Dominion (Texas), Inc.
UBS AG, Stamford Branch
Wells Fargo Bank Texas, N.A.
Westdeutsche Landesbank Girozentrale
Credit Agricole Indosuez
Suntrust Bank
The Dai-Ichi Kangyo Bank, Ltd.
Arab Banking Corporation (B.S.C.)
Bank of China
Bank of Oklahoma, N.A.
BNP Paribas, Houston Agency
DG Bank
KBC Bank, N.V.
The Sumitomo Bank, Limited
</Table>

                                  Sch IV -- 1
<PAGE>   27

<Table>
<Caption>
BANKS                                                                             COMMITMENT
<S>                                                                            <C>
Commerce Bank, N.A.
RZB Finance LLC

                                                                               -----------------
COMMITMENTS                                                                    $2,200,000,000.00
                                                                               =================
</Table>

                                  Sch IV -- 2
<PAGE>   28

                                     ANNEX A

Assets to be subject to the Sale and Lease-back transaction:

WILLIAMS TECHNOLOGY CENTER

The (a) real property and structures located east of the existing Bank of
Oklahoma Tower at One Williams Center, Tulsa, Oklahoma commonly known as the
Williams Technology Center (the "Center"), Tech Center Parking Garage (including
the "La Pente" parcel) (located at First Street and Cincinnati Avenue), Skywalk,
Skywalk Support and Skywalk Support Parcel (the "Realty") and (b) the personal
property and fixtures generally comprised of the furniture, fixtures and
equipment as are located or to be located upon or affixed or to be affixed to
the Realty (the "FF&E").

AIRCRAFT

The Aircraft shall include the three (3) aircraft identified as follows:

Citation X (N358WC)
Citation V (N352WC)
Citation Excel (N359WC)

The aggregate value of the assets described above is approximately $277,000,000.

                                  Annex A -- 1
<PAGE>   29

                                    EXHIBIT A

                                 FORM OF OPINION

                                 Exhibit A -- 1

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