Document:

<PAGE>   1

                                                                   EXHIBIT 10.3

                                 AMENDMENT NO. 1

         AMENDMENT NO. 1, dated as of September 22, 1999 (this "Amendment"), to
the Third Amended and Restated Credit Agreement, dated as of March 23, 1995, as
amended and restated through May 27, 1999 (as amended, supplemented or otherwise
modified prior to the date hereof, the "Credit Agreement"), among LEVIATHAN GAS
PIPELINE PARTNERS, L.P., a Delaware limited partnership (the "Borrower"),
LEVIATHAN FINANCE CORPORATION, a Delaware corporation (the "Co-Borrower"), the
banks and other financial institutions (the "Lenders") parties hereto, CREDIT
LYONNAIS, as Syndication Agent, BANKBOSTON, N.A., as Documentation Agent, and
THE CHASE MANHATTAN BANK, a New York banking corporation, as administrative
agent (in such capacity, the "Administrative Agent") for the Lenders.

                              W I T N E S S E T H:

         WHEREAS, pursuant to the Credit Agreement, the Lenders have agreed to
make, and have made, extensions of credit to the Borrower and the Co-Borrower;
and

         WHEREAS, the Borrower has requested that certain provisions of the
Credit Agreement be amended and waived in the manner provided for in this
Amendment in order to permit the transactions described in Exhibit A to this
Amendment; and

         WHEREAS, the Administrative Agent and the Required Lenders are willing
to agree to such amendments and waivers, but only on the terms and subject to
the conditions set forth in this Amendment;

         NOW, THEREFORE, in consideration of the premises and for other good and
valuable consideration, the sufficiency of which is hereby acknowledged, the
Borrower, the Co-Borrower, the Administrative Agent, and the Required Lenders
hereby agree as follows:

         1. Definitions. Unless otherwise defined herein, terms defined in the
recitals to this Amendment have the meanings specified therein, and terms
defined in the Credit Agreement (including all amendments thereto) are used
herein as therein defined.

         2. Amendments to Credit Agreement.

                  A. Amendment to Subsection 1.1. (a) Subsection 1.1 of the
Credit Agreement is amended by adding the following definitions in proper
alphabetical order:

                  "Affected Joint Venture": as defined in Exhibit A to Amendment
         No. 1 dated as of September 22, 1999 to this Agreement.

                  "ANR": ANR Pipeline Company, a Delaware corporation.

                  "Leviathan/ANR Holdings": the one or more holding companies
         (including Western Gulf, if applicable) to be formed by Leviathan and
         ANR or an Affiliate of ANR

                                        1
<PAGE>   2

         to consummate the Leviathan/ANR Reorganization and which will hold the
         equity interests to be contributed pursuant to the Leviathan/ANR
         Reorganization.

                  "Leviathan/ANR Parent Holdings": the Subsidiary of the
         Borrower which owns the Borrower's equity interests in Leviathan/ANR
         Holdings.

                  "Leviathan/ANR Reorganization": the corporate, partnership and
         limited liability company reorganization described in Exhibit A to
         Amendment No. 1 dated as of September 22, 1999 to this Agreement.

                  (b) The definition of "Consolidated EBITDA" is amended by
deleting the phrase "Unrestricted Subsidiaries and Joint Ventures," which
appears at the end of clause (x) and substituting thereafter the phrase
"Unrestricted Subsidiaries and Joint Ventures (other than cash proceeds funded
from the refinancing of the original capital investment by the Borrower and its
Subsidiaries in Unrestricted Subsidiaries and Joint Ventures)".

                  (c) The definition of "Joint Venture" is amended by deleting
the proviso clause therefrom and substituting therefor the following:

                  provided that each of Leviathan/ANR Holdings and its
                  Subsidiaries shall be deemed to be a Joint Venture for
                  purposes of the Loan Documents unless any such Person becomes
                  a Subsidiary in accordance with the definition thereof and the
                  Borrower designates such Person as a Subsidiary.

                  (d) The definition of "Subsidiary" is amended by deleting the
last sentence therefrom and substituting therefor the following:

                  Notwithstanding the foregoing, from and after the
                  Leviathan/ANR Reorganization, each of Leviathan/ANR Holdings
                  and its Subsidiaries shall be deemed not to be Subsidiaries of
                  the Borrower unless, and to the extent, any of the foregoing
                  would otherwise be a Subsidiary and is designated as a
                  Subsidiary of the Borrower in a writing delivered by the
                  Borrower to the Administrative Agent.

                  (e) The definition of "Subsidiary Guarantors" is amended by
(i) adding the phase "Leviathan/ANR Parent Holdings," immediately after the
phase "Sailfish," and (ii) upon the liquidation of Stingray Holding, THC, TOGT
and TOPC pursuant to subsection 8.5(e), deleting the phrases "Stingray Holding,"
"THC," "TOGT," and "TOPC".

                  B. Amendment to Subsection 8.5. Subsection 8.5 of the Credit
Agreement is amended by (i) deleting the word "and" from the end of paragraph
(c), (ii) deleting the period from the end of paragraph (d) and substituting
therefor the phrase "; and" and (iii) adding the following now paragraph (e) at
the end thereof.

                           (e) to effect the Leviathan/ANR Reorganization,
                  including, without limitation, the dissolution, by merger or
                  otherwise, of any Subsidiaries of the Borrower that are
                  holding companies for any Affected Joint Venture.

                                       2
<PAGE>   3

                  C. Amendment to Subsection 8.6. Subsection 8.6 of the Credit
Agreement is hereby amended by (i) deleting the word "and" from the end of
paragraph (a), (ii) deleting the period from the end of paragraph (b) and
substituting therefor the phrase ", and" and (iii) adding the following new
paragraph (c):

                  (c) to the extent necessary to effect the Leviathan/ANR
Reorganization.

                  D. Amendment to Subsection 8.8. Subsection 8.8 of the Credit
Agreement is amended by (i) deleting the word "and" from the end of clause (f),
(ii) deleting the period from the end of clause (g) and substituting therefor
the phrase "; and" and (iii) adding the following new paragraph (h) at the end
thereof.

                  (h) to the extent necessary to effect the Leviathan/ANR
Reorganization.

                  E. Amendment to Subsection 8.20. Subsection 8.20 of the Credit
Agreement is amended by adding the following at the end thereof:

                  except to the extent necessary to effect the Leviathan/ANR
                  Reorganization.

         3. Waiver of Subsection 8.10. Subsection 8.10 of the Credit Agreement
is waived to the extent necessary to permit the consummation of the
Leviathan/ANR Reorganization, it being agreed that subsection 8.10 shall
continue to apply thereafter to transactions with or benefiting Leviathan/ANR
Holdings and its Subsidiaries.

         4. Releases. In accordance with subsection 11.18 of the Credit
Agreement the Lenders authorize the Administrative Agent to take any action
reasonably requested by the Borrower upon the consummation of the Leviathan/ANR
Reorganization (a) to release any assets of or Capital Stock in Leviathan/ANR
Holdings or any Affected Joint Venture from the Liens created by the Loan
Documents and (b) to release any Subsidiaries Guarantee delivered by
Leviathan/ANR Holdings, any Affected Joint Venture or any Holding company for
any Affected Joint Venture if such holding company is liquidated in connection
with the Leviathan/ANR Reorganization.

         5. Conditions to Effectiveness. This Amendment shall become effective
on the date (the "Amendment Effective Date") on which all of the following
conditions precedent have been satisfied or waived:

                  (a) The Borrower, the Co-Borrower, the Administrative Agent
and the Required Lenders shall have executed and delivered to the Administrative
Agent this Amendment, and the other Loan Parties shall have executed and
delivered to the Administrative Agent the attached Acknowledgment
("Acknowledgement") approving this Amendment.

                  (b) The Borrower and Leviathan/ANR Parent Holdings shall have
complied with subsections 7.10 and 8.17 of the Credit Agreement. Without
limitation of the foregoing, (i) the Capital Stock of Leviathan/ANR Parent
Holdings shall have been pledged to the Administrative Agent pursuant to the
Security Documents, (ii) Leviathan/ANR Parent Holdings shall have executed and
delivered to the Administrative Agent the Subsidiaries Guarantee, the Subsidiary
Security Agreement and a pledge agreement in a form reasonably requested by the

                                       3
<PAGE>   4

Administrative Agent in order to pledge the Capital Stock of Leviathan/ANR
Parent Holdings to the Administrative Agent.

         6. General.

                  (a) Representations and Warranties. After giving effect to the
effectiveness of this Amendment, the representations and warranties made by the
Loan Parties in the Loan Documents are true and correct in all material respects
on and as of the Amendment Effective Date (unless such representations or
warranties are stated to refer to a specific earlier date, in which case such
representations and warranties shall be true and correct in all material
respects as of such earlier date) as if made on and as of the Amendment
Effective Date and no Event of Default will have occurred and be continuing.

                  (b) Payment of Expenses. The Borrower agrees to pay or
reimburse the Administrative Agent for all of its out-of-pocket costs and
reasonable expenses incurred in connection with this Amendment, any other
documents prepared in connection herewith and the transactions contemplated
hereby, including, without limitation, the reasonable fees and disbursements of
counsel to the Administrative Agent.

                  (c) No Other Amendments; Confirmation. Except as expressly
amended, modified and supplemented hereby, the provisions of the Credit
Agreement, the Notes and the other Loan Documents are and shall remain in full
force and effect.

                  (d) Governing Law; Counterparts. (i) THIS AMENDMENT AND THE
RIGHTS AND OBLIGATIONS OF THE PARTIES HERETO SHALL BE GOVERNED BY, AND CONSTRUED
AND INTERPRETED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

                  (ii) This Amendment may be executed by one or more of the
parties to this Amendment on any number of separate counterparts, and all of
said counterparts taken together shall be deemed to constitute one and the same
instrument.

                     [Remainder of Page Intentionally Blank]

                                       4
<PAGE>   5

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed and delivered as of the day and year first above written.

                                        LEVIATHAN GAS PIPELINE PARTNERS, LP.

                                        LEVIATHAN FINANCE CORPORATION

                                        By:  /s/ KEITH FORMAN
                                             ---------------------------------
                                        Name:    Keith Forman
                                        Title:   Chief Financial Officer

                                        THE CHASE MANHATTAN BANK, as
                                        Administrative Agent and as a Lender

                                        By:  /s/ PETER M. LING
                                             ---------------------------------
                                        Name:    Peter M. Ling
                                        Title:   Vice President

                                        CREDIT LYONNAIS NEW YORK BRANCH

                                        By:  /s/ PHILLIPE SOUSINS
                                             ---------------------------------
                                        Name:    Phillipe Sousins
                                        Title:   Senior Vice President

                                        BANKBOSTON, N.A.

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

                                        ARAB BANKING CORPORATION (B.S.C.)

                                        By:  /s/ STEPHEN A. PLAUCHE
                                            ---------------------------------
                                        Name:    Stephen A. Plauche
                                        Title:   Vice President

<PAGE>   6

                                        THE BANK OF NOVA SCOTIA

                                        By:  /s/ F.C.H. ASHBY
                                             ---------------------------------
                                        Name:    F.C.H. Ashby
                                        Title:   Senior Manager Loan Operations

                                        BANK OF SCOTLAND

                                        By:  /s/ ANNIE GLYNN
                                             ---------------------------------
                                        Name:    Annie Glynn
                                        Title:   Senior Vice President

                                        THE FIRST NATIONAL BANK OF CHICAGO

                                        By:  /s/ KENNETH J. FATUR
                                             ---------------------------------
                                        Name:    Kenneth J. Fatur
                                        Title:   Vice President

                                        BANK OF AMERICA NT&SA

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

                                        CREDIT AGRICOLE INDOSUEZ

                                        By:  /s/ DOUGLAS A. WHIDDON
                                             ---------------------------------
                                        Name:    Douglas A. Whiddon
                                        Title:   Senior Vice President
                                                 Relationship Manager

                                        By:  /s/ BRIAN D. KNEZEAK
                                             ---------------------------------
                                        Name:    Brian D. Knezeak
                                        Title:   First Vice President

<PAGE>   7

                                        CIBC, INC.

                                        By:  /s/ ROGER COLDEN
                                            ------------------------------------
                                        Name:    Roger Colden
                                        Title:   Authorized Signatory

                                        CREDIT SUISSE FIRST BOSTON

                                        By:  /s/ DOUGLAS E. MAHER
                                           ------------------------------------
                                        Name:    Douglas E. Maher
                                        Title:   Vice President

                                        By:  /s/ JEFFREY B. ULMER
                                           ------------------------------------
                                        Name:    Jeffrey B. Ulmer
                                        Title:   Vice President

                                        THE FUJI BANK, LIMITED

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

                                        HIBERNIA NATIONAL BANK

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

<PAGE>   8

                                        FIRST UNION NATIONAL BANK

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

                                        KBC BANK, N.A.

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

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

                                        WELLS FARGO BANK (TEXAS), N.A.

                                        By:  /s/ CHRISTINA FAITH
                                            ------------------------------------
                                        Name:    Christina Faith
                                        Title:   AVP

                                        PNC BANK, NATIONAL ASSOCIATION

                                        By:  /s/ THOMAS A. MAJESKI
                                            ------------------------------------
                                        Name:    Thomas A. Majeski
                                        Title:   Vice President
<PAGE>   9

                                        PARIBAS

                                        By:  /s/ MARIAN LIVINGSTON
                                            ------------------------------------
                                        Name:    Marian Livingston
                                        Title:   Vice President

                                        By:  /s/ BETSY JOCHER
                                            ------------------------------------
                                        Name:    Betsy Jocher
                                        Title:   Vice President

                                        MIESPIERSON CAPITAL CORP.

                                        By:  /s/ KAREI LOMAN
                                            ------------------------------------
                                        Name:    Karei Loman
                                        Title:   Managing Director

                                        By:  /s/ DEIRDRE SANBORN
                                            ------------------------------------
                                        Name:    Deirdre Sanborn
                                        Title:   Vice President

                                        BANK ONE, NA (formerly known as THE
                                        FIRST NATIONAL BANK OF CHICAGO)

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

<PAGE>   10

                                 ACKNOWLEDGMENT

         Each undersigned guarantors hereby consents and agrees to the foregoing
Amendment and acknowledges and agrees that (i) all obligations of the Borrower
and Co-Borrower under the Credit Agreement, as amended by the foregoing
Amendment, are Obligations which are secured and guaranteed by the Security
Documents to which it is a party, (ii) all references to the Credit Agreement in
the Security Documents refer to the Credit Agreement, as amended from time to
time (including pursuant to the foregoing Amendment) and (iii) all references to
Loans and Letters of Credit and Letters of Credit in the Security Documents
refer to the Loans and Letter of Credit under the Credit Agreement, as amended
by the foregoing Amendment.

LEVIATHAN GAS PIPELINE COMPANY

DELOS OFFSHORE COMPANY, L.L.C.

EWING BANK GATHERING COMPANY, L.L.C.

FLEXTREND DEVELOPMENT COMPANY, L.L.C.

GREEN CANYON PIPELINE COMPANY, L.L.C.

LEVIATHAN OIL TRANSPORT SYSTEMS, L.L.C.

MANTA RAY GATHERING COMPANY, L.L.C.

POSEIDON PIPELINE COMPANY, L.L.C.

SAILFISH PIPELINE COMPANY, L.L.C.

STINGRAY HOLDING, L.L.C.

TARPON TRANSMISSION COMPANY

TRANSCO HYDROCARBONS COMPANY, L.L.C.

TEXAM OFFSHORE GAS TRANSMISSION, L.L.C.

TRANSCO OFFSHORE PIPELINE COMPANY, L.L.C.

VK DEEPWATER GATHERING COMPANY, L.L.C.

VK-MAIN PASS GATHERING COMPANY, L.L.C.

NATOCO, L.L.C.

<PAGE>   11

UTOS HOLDING, L.L.C.

MORAY PIPELINE COMPANY, L.L.C.

/s/ KEITH FORMAN
-------------------------------------------
Keith Forman
Chief Financial Officer of Each Such Entity<PAGE>   1
                                                                    EXHIBIT 10.4
                           AMENDMENT NO. 2 AND WAIVER

         THIS AMENDMENT NO. 2 AND WAIVER, dated as of November 26,1999 (this
"Amendment") to the Third Amended and Restated Credit Agreement, dated as of May
27, 1999 (as amended, supplemented or otherwise modified prior to the date
hereof, the "Credit Agreement"), among LEVIATHAN GAS PIPELINE PARTNERS, L.P., a
Delaware limited partnership (the "Borrower"), LEVIATHAN FINANCE CORPORATION, a
Delaware corporation (the "Co-Borrower"), LEVIATHAN GAS PIPELINE COMPANY, a
Delaware corporation (the "Guarantor"), the several banks and other financial
institutions from time to time parties to the Credit Agreement (the "Lenders"),
and THE CHASE MANHATTAN BANK, a New York banking corporation, as administrative
agent (in such capacity the "Administrative Agent") for the Lenders.

         WHEREAS, pursuant to the Credit Agreement, the Lenders have agreed to
make, and have made, extensions of credit to the Borrower and Co-Borrower;

         WHEREAS, the Borrower and Guarantor have requested that certain
provisions of the Credit Agreement and other Loan Documents be waived in order
to permit each party set forth in Exhibit A attached hereto to change its name
as set forth therein (the "Name Changes");

         WHEREAS, the Administrative Agent and the Required Lenders are willing
to agree to such waivers, but only on the terms and subject to the conditions
set forth in this Amendment;

         NOW, THEREFORE, in consideration of the premises and for other good and
valuable consideration, the sufficiency of which is hereby acknowledged, the
Borrower, Guarantor, Administrative Agent, and the Required Lenders hereby agree
as follows:

         1.    Definitions. Unless otherwise defined herein, terms defined in
the Credit Agreement are used herein as therein defined.

         2.    Waivers. Each of the following provisions are hereby waived to
the extent necessary to permit the Name Changes, it being understood that each
such provision will continue to apply thereafter to each relevant Loan Party:

         (a)   Sections 8.14 and 9.1(j) of the Credit Agreement;

         (b)   Section 4(i) of the Borrower Pledge Agreement;

         (c)   Section 3(i) of the Leviathan Pledge Agreement (LLC);

         (d)   Section 4(i) of the Leviathan Pledge Agreement (GP);

         (e)   Section 5(o) of the Borrower Security Agreement;

         (f)   Section 5(m) of the Leviathan Security Agreement; and

         (g)   Section 5(o) of the Subsidiary Security Agreement.

                                       1
<PAGE>   2

         3.    Amendments. Except as set forth in Section 3(g), each of the Loan
Documents is hereby amended as follows:

         (a)   Each occurrence of the term "Leviathan Gas Pipeline Partners,
               L.P." therein is replaced with the term "El Paso Energy
               Partners, L.P.";

         (b)   Each occurrence of the term "Leviathan Gas Pipeline Company"
               therein is replaced with the term "El Paso Energy Partners
               Company";

         (c)   Each occurrence of the term "Leviathan Finance Corporation"
               therein is replaced with the term "El Paso Energy Partners
               Finance Corporation";

         (d)   Each occurrence of the term "Leviathan Operating Company,
               L.L.C." therein is replaced with the term "El Paso Energy
               Partners Operating Company, L.L.C.";

         (e)   Each occurrence of the term "Leviathan Deepwater, L.L.C."
               therein is replaced with the term "El Paso Energy Partners
               Deepwater, L.L.C."; and

         (f)   Each occurrence of the term Leviathan Oil Transport System,
               L.L.C. therein is replaced with the term El Paso Energy
               Partners Oil Transport, L.L.C.

         (g)   Notwithstanding the foregoing, any references to "Leviathan
               Gas Pipeline Partners, L.P." with respect to its role as a
               party to any of the Notes shall remain unchanged.

         4. Effectiveness. This Amendment shall become effective on the date
(the "Amendment Effective Date") the following conditions precedent are first
satisfied:

         (a)   The Administrative Agent shall have received evidence
               satisfactory to the Administrative Agent that this Amendment
               has been executed and delivered by the Required Lenders;

         (b)   The Borrower, Co-Borrower, Guarantor, and each applicable
               Subsidiary Guarantor shall have executed all financing
               statements required by the Administrative Agent; and

         (c)   This Amendment shall not contravene, violate or conflict with,
               or involve any Lender in any violation of, any contractual
               obligation or requirement of law.

         5. Representations and Warranties. After giving effect to the
effectiveness of this Amendment, the representations and warranties made by the
Loan Parties in the Loan Documents are true and correct in all material respects
on and as of the Amendment Effective Date (unless such representations or
warranties are stated to refer to a specific earlier date, in which case such
representations and warranties shall be true and correct in all material
respects as of such earlier date) as if made on and as of the Amendment
Effective Date and no Default or Event of Default will have occurred and be
continuing.

                                       2
<PAGE>   3

         6. Confirmation. Notwithstanding the Name Changes, each of the
Borrower, Co-Borrower, Leviathan, and the Subsidiary Guarantors hereby ratifies
and confirms all of its obligations, liabilities and indebtedness under the Loan
Documents, including but not limited to the Notes, the Guarantees and the
Security Documents.

         7. Payment of Expenses. The Borrower agrees to pay or reimburse the
Administrative Agent for all of its out-of-pocket costs and reasonable expenses
incurred in connection with this Amendment, any other documents prepared in
connection herewith and the transactions contemplated hereby, including, without
limitation, the reasonable fees and disbursements of counsel to the
Administrative Agent.

         8. No Other Waivers or Amendments. Except as expressly waived hereby,
the Credit Agreement and the other Loan Documents shall remain in full force and
effect in accordance with their respective terms, without any waiver, amendment
or modification of any provision thereof.

         9. Counterparts. This Amendment may be executed by one or more of the
parties hereto on any number of separate counterparts and all of said
counterparts taken together shall be deemed to constitute one and the same
instrument.

         10. Applicable Law. THIS AMENDMENT AND THE RIGHTS AND OBLIGATIONS OF
THE PARTIES HERETO SHALL BE GOVERNED BY, AND CONSTRUED AND INTERPRETED IN
ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK.

            [The remainder of this page is intentionally left blank.]

                                       3
<PAGE>   4

         IN WITNESS WHEREOF, the parties hereto here caused this Amendment to be
duly executed and delivered by its proper and duly authorized officer as of the
day and year first above written.

                                         LEVIATHAN GAS PIPELINE PARTNERS, LP.
                                         LEVIATHAN FINANCE CORPORATION
                                         LEVIATHAN GAS PIPELINE COMPANY
                                         SAILFISH PIPELINE COMPANY, L.L.C.
                                         MANTA RAY GATHERING COMPANY, L.L.C.
                                         EWING BANK GATHERING COMPANY, L.L.C.
                                         LEVIATHAN OPERATING COMPANY, L.L.C.
                                         GREEN CANYON PIPELINE COMPANY, L.L.C.
                                         LEVIATHAN DEEPWATER, L.L.C.
                                         VK-DEEPWATER GATHERING COMPANY, L.L.C.
                                         VK-MAIN PASS GATHERING COMPANY, L.L.C.
                                         MORAY PIPELINE COMPANY, L.L.C.
                                         LEVIATHAN OIL TRANSPORT SYSTEMS, L.L.C.
                                         POSEIDON PIPELINE COMPANY, L.L.C.
                                         FLEXTREND DEVELOPMENT COMPANY, L.L.C.
                                         DELOS OFFSHORE COMPANY, L.L.C.
                                         TARPON TRANSMISSION COMPANY

                                         By:  /s/ KEITH FORMAN
                                            ---------------------------------
                                         Name:    Keith Forman
                                              -------------------------------
                                         Title:   Chief Financial Officer
                                               ------------------------------

                                         THE CHASE MANHATTAN BANK, as
                                         Administrative Agent and as a Lender

                                         By:  /s/ PETER M. LING
                                            ---------------------------------
                                         Name:    Peter M. Ling
                                              -------------------------------
                                         Title:   Vice President
                                               ------------------------------

                                         CREDIT LYONNAIS NEW YORK BRANCH

                                         By:  /s/ PHILLIPE SOUSINS
                                            ---------------------------------
                                         Name:    Phillipe Sousins
                                              -------------------------------
                                         Title:   Senior Vice President
                                               ------------------------------

                                       4
<PAGE>   5

                                            BANKBOSTON, N.A.

                                            By:  /s/ CHRISTOPHER HOLMGREN
                                               ---------------------------------
                                            Name:    Christopher Holmgren
                                                 -------------------------------
                                            Title:   Director
                                                  ------------------------------

                                            ARAB BANKING CORPORATION

                                            By:  /s/ STEPHEN A. PLAUCHE
                                               ---------------------------------
                                            Name:    Stephen A. Plauche
                                                 -------------------------------
                                            Title:   Vice President
                                                  ------------------------------

                                            THE BANK OF NOVA SCOTIA

                                            By:  /s/ F.C.H. ASHBY
                                               ---------------------------------
                                            Name:    F.C.H. Ashby
                                                 -------------------------------
                                            Title:   Senior Manager Loan
                                                       Operations
                                                  ------------------------------

                                            BANK OF SCOTLAND

                                            By:  /s/ ANNIE GLYNN
                                               ---------------------------------
                                            Name:    Annie Glynn
                                                 -------------------------------
                                            Title:   Senior Vice President
                                                  ------------------------------

                                            BANK ONE, NA (formerly known as THE
                                            FIRST NATIONAL BANK OF CHICAGO)

                                            By:  /s/ KAREN PATTERSON
                                               ---------------------------------
                                            Name:    Karen Patterson
                                                 -------------------------------
                                            Title:   Vice President
                                                  ------------------------------

                                       5
<PAGE>   6

                                            BANK OF AMERICA NT&SA

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

                                            CREDIT AGRICOLE INDOSUEZ

                                            By:  /s/ DOUGLAS A. WHIDDON
                                               ---------------------------------
                                            Name:    Douglas A. Whiddon
                                            Title:   VP Senior Relationship Mgr.

                                            By:  /s/ PATRICK COCQUEREL
                                               ---------------------------------
                                            Name:    Patrick Cocquerel
                                            Title:   First Vice President

                                            CIBC, INC.

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

                                            CREDIT SUISSE FIRST BOSTON

                                            By:  /s/ DOUGLAS E. MAHER
                                               ---------------------------------
                                            Name:    Douglas E. Maher
                                            Title:   Vice President

                                            By:  /s/ JAMES P. MORAN
                                               ---------------------------------
                                            Name:    James P. Moran
                                            Title:   Director

                                       6
<PAGE>   7

                                            THE FUJI BANK, LIMITED

                                            By:  /s/ TEIJI TERRAMOTO
                                               ---------------------------------
                                            Name:    Teiji Terramoto
                                            Title:   Vice President and Manager

                                            HIBERNIA NATIONAL BANK

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

                                            FIRST UNION NATIONAL BANK

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

                                            KBC BANK, N.A.

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

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

                                            WELLS FARGO BANK (TEXAS), N.A.

                                            By:  /s/ RONALD A. MAHLE
                                               ---------------------------------
                                            Name:    Ronald A. Mahle
                                            Title:   Vice President

                                       7
<PAGE>   8

                                            PNC BANK, NATIONAL ASSOCIATION

                                            By:  /s/ Thomas A. Majeski
                                               ---------------------------------
                                            Name:    Thomas A. Majeski
                                            Title:   Vice President

                                            PARIBAS

                                            By:  /s/ MARIAN LIVINGSTON
                                               ---------------------------------
                                            Name:    Marian Livingston
                                            Title:   Vice President

                                            By:  /s/ BETSY JOCHER
                                               ---------------------------------
                                            Name:    Betsy Jocher
                                            Title:   Vice President

                                            MIESPIERSON CAPITAL CORP.

                                            By:  /s/ DARRELL W. HOLLEY
                                               ---------------------------------
                                            Name:    Darrell W. Holley
                                            Title:   SVP

                                       8
<PAGE>   9

                                    EXHIBIT A

         Each of the following entities will, effective December 2, 1999, change
its name as set forth below:

<TABLE>
<CAPTION>
                       Current Name                                                  New Name
                       ------------                                                  --------

<S>                                                         <C>
Leviathan Gas Pipeline Partners, L.P.                        El Paso Energy Partners, L.P.
Leviathan Gas Pipeline Company                               El Paso Energy Partners Company
Leviathan Finance Corporation                                El Paso Energy Partners Finance Corporation
Leviathan Operating Company, L.L.C.                          El Paso Energy Partners Operating Company, L.L.C.
Leviathan Deepwater, L.L.C.                                  El Paso Energy Partners Deepwater, L.L.C.
Leviathan Oil Transport Systems, L.L.C.                      El Paso Energy Partners Oil Transport, L.L.C.
</TABLE>

                                      A-1

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00006-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00006-of-00352.parquet"}]]