PLAINS ALL AMERICAN PIPELINE LP
S-1/A, 1999-09-29
PIPE LINES (NO NATURAL GAS)
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<PAGE>


As filed with the Securities and Exchange Commission on September 29, 1999
                                                      Registration No. 333-86907
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                              Amendment No. 2
                                       to
                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933

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

                       PLAINS ALL AMERICAN PIPELINE, L.P.
             (Exact name of Registrant as specified in its charter)

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

         Delaware                     4861                   76-0582150
      (State or other           (Primary Standard         (I.R.S. Employer
       jurisdiction                Industrial            Identification No.)
    of incorporation or        Classification Code
       organization)                 Number)

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

                                   500 Dallas
                              Houston, Texas 77002
                                 (713) 654-1414
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)

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

                              Michael R. Patterson
                                   500 Dallas
                              Houston, Texas 77002
                                 (713) 654-1414
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

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

                                   Copies to:

       Andrews & Kurth L.L.P.                     Baker & Botts, L.L.P.
       600 Travis, Suite 4200                     3000 One Shell Plaza
        Houston, Texas 77002                          910 Louisiana
           (713) 220-4200                         Houston, Texas 77002
        Attn: David P. Oelman                        (713) 229-1234
                                                  Attn: Joshua Davidson

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

   Approximate date of commencement of proposed sale to the public: As soon as
practicable after this Registration Statement becomes effective.

   If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, please check the following box. [_]

   If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following
box and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [_]

   If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]

   If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]

   If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [_]

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


   The Registrant hereby amends this Registration Statement on such date or
dates as may be necessary to delay its effective date until the Registrant
shall file a further amendment which specifically states that this Registration
Statement shall thereafter become effective in accordance with Section 8(a) of
the Securities Act of 1933 or until this Registration Statement shall become
effective on such date as the Commission, acting pursuant to said Section 8(a),
may determine.

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

   Set forth below are the expenses (other than underwriting discounts and
commissions) expected to be incurred in connection with the issuance and
distribution of the securities registered hereby. With the exception of the
Securities and Exchange Commission registration fee, the NASD filing fee and
the NYSE filing fee, the amounts set forth below are estimates:

<TABLE>
   <S>                                                                 <C>
   Securities and Exchange Commission registration fee................ $ 16,467
   NASD filing fee....................................................    6,424
   NYSE listing fee...................................................   36,000
   Printing and engraving expenses....................................  300,000
   Legal fees and expenses............................................   75,000
   Accounting fees and expenses.......................................  145,000
   Transfer agent and registrar fees..................................    4,000
   Miscellaneous......................................................    2,109
                                                                       --------
     TOTAL............................................................ $585,000
                                                                       ========
</TABLE>
- --------
*To be added by amendment.

ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS

   The section of the prospectus entitled "The Partnership Agreement --
Indemnification" is incorporated herein by this reference. Reference is made to
Section 7 of the Underwriting Agreement filed as Exhibit 1.1 to the
Registration Statement. Subject to any terms, conditions or restrictions set
forth in the Partnership Agreement, Section 17-108 of the Delaware Revised
Uniform Limited Partnership Act empowers a Delaware limited partnership to
indemnify and hold harmless any partner or other person from and against all
claims and demands whatsoever.

ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES

   We issued 6,974,239 common units and 10,029,619 subordinated units to a
subsidiary of our general partner in connection with our formation on September
17, 1998 pursuant to transactions exempt from registration under Section 4(2)
of the Securities Act of 1933. On May 12, 1999, we issued 1,307,190 Class B
common units to the general partner pursuant to a transaction that is exempt
from registration pursuant to Section 4(2) of the Securities Act. We have not
sold any other unregistered securities within the past three years.

ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

a. Exhibits:

<TABLE>
 <C>  <C> <S>
 1.1*  -- Form of Underwriting Agreement
 3.1   -- Second Amended and Restated Agreement of Limited Partnership of
          Plains All American Pipeline, L.P. (incorporated by reference to
          Exhibit 3.1 to the registrant's Annual Report on Form 10-K filed
          on March 31, 1999)
 3.2   -- Amended and Restated Agreement of Limited Partnership of Plains
          Marketing, L.P. (incorporated by reference to Exhibit 3.2 to the
          registrant's Annual Report on Form 10-K filed on March 31, 1999)
 3.3   -- Amended and Restated Agreement of Limited Partnership of All
          American Pipeline, L.P. (incorporated by reference to Exhibit 3.3
          to the registrant's Annual Report on Form 10-K filed on March 31,
          1999)
</TABLE>

                                      II-1
<PAGE>

<TABLE>
 <C>   <C> <S>
 3.4    -- Certificate of Limited Partnership of Plains All American
           Pipeline, L.P. (incorporated by reference to Exhibit 3.4 to
           registrant's Registration Statement on Form S-1, file no. 333-
           64107)
 3.5    -- Certificate of Limited Partnership of Plains Marketing, L.P.
           (incorporated by reference to Exhibit 3.5 to the registrant's
           Annual Report on Form 10-K filed on March 31, 1999)
 3.6    -- Articles of Conversion of All American Pipeline, L.P.
           (incorporated by reference to Exhibit 3.6 to the registrant's
           Annual Report on Form 10-K filed on March 31, 1999)
 3.7    -- Agreement of Limited Partnership of Plains Scurlock Permian, L.P.
           (incorporated by reference to Exhibit 3.7 to the registrant's
           Quarterly Report on Form 10-Q filed on May 14, 1999)
 3.8    -- Amendment No. 1 to the Second Amended and Restated Agreement of
           Limited Partnership of Plains All American Pipeline, L.P.
           (incorporated by reference to Exhibit 3.8 to the registrant's
           Quarterly Report on Form 10-Q filed on August 16, 1999)
 3.9*   -- Certificate of Limited Partnership of Plains Scurlock Permian,
           L.P.
 5.1*   -- Opinion of Andrews & Kurth L.L.P. as to the legality of the
           securities being registered
 8.1*   -- Opinion of Andrews & Kurth L.L.P. relating to tax matters
 10.1   -- Credit Agreement among All American Pipeline, L.P., Plains All
           American Pipeline, L.P., Plains Marketing, L.P., ING (U.S.)
           Capital Corporation and certain other banks (incorporated by
           reference to Exhibit 10.1 to the registrant's Annual Report on
           Form 10-K filed on March 31, 1999)
 10.2   -- Amended and Restated Credit Agreement among Plains Marketing,
           L.P., Plains All American Pipeline, L.P., All American Pipeline,
           L.P., BankBoston, N.A. and certain other banks (incorporated by
           reference to Exhibit 10.2 to the registrant's Annual Report on
           Form 10-K filed on March 31, 1999)
 10.3   -- Contribution, Conveyance and Assumption Agreement among Plains All
           American Pipeline, L.P. and certain other parties (incorporated by
           reference to Exhibit 10.3 to the registrant's Annual Report on
           Form 10-K filed on March 31, 1999)
 10.4   -- Plains All American Inc. 1998 Long-Term Incentive Plan
           (incorporated by reference to Exhibit 10.4 to the registrant's
           Annual Report on Form 10-K filed on March 31, 1999)
 10.5   -- Plains All American Inc. Management Incentive Plan (incorporated
           by reference to Exhibit 10.5 to the registrant's Annual Report on
           Form 10-K filed on March 31, 1999)
 10.6   -- Employment Agreement between Plains Resources Inc. and Harry N.
           Pefanis (incorporated by reference to Exhibit 10.6 to the
           registrant's Annual Report on Form 10-K filed on March 31, 1999)
 10.7   -- Crude Oil Marketing Agreement between Plains Resources Inc.,
           Plains Illinois Inc., Stocker Resources, L.P., Calumet Florida,
           Inc. and Plains Marketing, L.P.(incorporated by reference to
           Exhibit 10.7 to the registrant's Annual Report on Form 10-K filed
           on March 31, 1999)
 10.8   -- Omnibus Agreement among Plains Resources Inc., Plains All American
           Pipeline, L.P., Plains Marketing, L.P., All American Pipeline,
           L.P. and Plains All American Inc. (incorporated by reference to
           Exhibit 10.8 to the registrant's Annual Report on Form 10-K filed
           on March 31, 1999)
 10.9   -- Transportation Agreement dated July 30, 1993 between All American
           Pipeline Company and Exxon Company, U.S.A. (incorporated by
           reference to Exhibit 10.9 to registrant's Registration Statement
           on Form S-1, file no. 333-64107)
 10.10  -- Transportation Agreement dated August 2, 1993 among All American
           Pipeline Company, Texaco Trading and Transportation Inc., Chevron
           U.S.A. and Sun Operating Limited Partnership (incorporated by
           reference to Exhibit 10.10 to registrant's Registration Statement
           on Form S-1, file no. 333-64107)
 10.11  -- Form of Transaction Grant Agreement (Deferred Payment)
           (incorporated by reference to Exhibit 10.11 to registrant's
           Registration Statement on Form S-1, file no. 333-64107)
 10.12  -- Form of Transaction Grant Agreement (Payment on Vesting)
           (incorporated by reference to Exhibit 10.12 to registrant's
           Registration Statement on Form S-1, file no. 333-64107)
 10.13  -- First Amendment to Contribution, Conveyance and Assumption
           Agreement dated as of December 15, 1998 (incorporated by reference
           to Exhibit 10.13 to the registrant's Annual Report on Form 10-K
           filed on March 31, 1999)
</TABLE>

                                      II-2
<PAGE>

<TABLE>
 <C>     <C> <S>
 10.14    -- First Amendment dated as of March 18, 1999, to Credit Agreement
             among All American Pipeline, L.P. Plains Marketing, L.P., ING
             (U.S.) Capital Corporation and certain other banks (incorporated
             by reference to Exhibit 10.14 to the registrant's Annual Report
             on Form 10-K filed on March 31, 1999)
 10.15    -- First Amendment dated as of March 18, 1999, to Amended and
             Restated Credit Agreement among Plains Marketing, L.P., Plains
             All American Pipeline, L.P., All American Pipeline, L.P., Bank
             Boston, N.A. and certain other banks (incorporated by reference
             to Exhibit 10.15 to the registrant's Annual Report on Form 10-K
             filed on March 31, 1999)
 10.16    -- Agreement for Purchase and Sale of Membership Interest in
             Scurlock, Permian LLC between Marathon Ashland LLC and Plains
             Marketing, L.P. dated as of March 17, 1999 (incorporated by
             reference to Exhibit 10.16 to the registrant's Annual Report on
             Form 10-K filed on March 31, 1999)
 10.17    -- Asset Sales Agreement between Chevron Pipe Line Company and
             Plains Marketing, L.P. dated April 16, 1999 (incorporated by
             reference to Exhibit 10.17 to the registrant's Quarterly Report
             on Form 10-Q filed on May 14, 1999)
 10.18    -- Credit Agreement dated as of May 12, 1999, between Plains
             Scurlock Permian, L.P. BankBoston, N.A. and certain financial
             institutions (incorporated by reference to Exhibit 10.18 to the
             registrant's Quarterly Report on Form 10-Q filed on May 14,
             1999)
 10.19    -- First Amendment to Credit Agreement dated as of July 29, 1999
             between Plains Scurlock Permian, L.P., BankBoston, N.A. and
             certain financial institutions (incorporated by reference to
             Exhibit 10.19 to the registrant's Quarterly Report on Form 10-Q
             filed on August 16, 1999)
 10.20**  -- Transaction Grant Agreement with Greg L. Armstrong
 10.21**  -- Second Amendment to Credit Agreement dated as of August 19,
             1999, between Plains Scurlock Permian, L.P., BankBoston, N.A.
             and certain financial institutions
 15.1**   -- Letter re unaudited interim financial information (relating to
             financial information of Wingfoot Ventures Seven, Inc.)
 21.1**   -- List of subsidiaries of the Partnership
 23.1**   -- Consent of PricewaterhouseCoopers LLP (relating to financial
             statements of Plains All American Inc., Plains Midstream
             Subsidiaries and Plains All American Pipeline, L.P.)
 23.2**   -- Consent of PricewaterhouseCoopers LLP (relating to financial
             statements of Wingfoot Ventures Seven, Inc.)
 23.3**   -- Consent of PricewaterhouseCoopers LLP (relating to financial
             statements of the Scurlock Permian Businesses)
 23.4*    -- Consent of Andrews & Kurth L.L.P. (contained in Exhibits 5.1 and
             8.1)
 24.1     -- Powers of Attorney (included on the signature page)
</TABLE>
- --------
*Filed herewith

** Previously filed

(b) Financial Statement Schedules

   All financial statement schedules are omitted because the information is not
required, is not material or is otherwise included in the financial statements
or related notes thereto.

ITEM 17. UNDERTAKINGS

   The undersigned Registrant hereby undertakes to provide at the closing
specified in the underwriting agreement certificates in such denominations and
registered in such names as required by the Underwriters to permit prompt
delivery to each purchaser.

                                      II-3
<PAGE>

   Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the
Registrant pursuant to the foregoing provisions, or otherwise, the Registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Securities
Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant in the successful defense of any action, suit or proceeding) is
asserted by such director, officer or controlling person in connection with the
securities being registered, the Registrant will, unless in the opinion of its
counsel the matter has been settled by controlling precedent, submit to a court
of appropriate jurisdiction the question whether such indemnification by it is
against public policy as expressed in the Securities Act and will be governed
by the final adjudication of such issue.

   The undersigned Registrant hereby undertakes that:

     (1) For purposes of determining any liability under the Securities Act,
  the information omitted from the form of prospectus filed as part of this
  Registration Statement in reliance upon Rule 430A and contained in a form
  of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or (4) or
  497(h) under the Securities Act shall be deemed to be part of this
  Registration Statement as of the time it was declared effective.

     (2) For the purposes of determining any liability under the Securities
  Act, each post-effective amendment that contains a form of prospectus shall
  be deemed to be a new registration statement relating to the securities
  offered therein, and the offering of such securities at that time shall be
  deemed to be the initial bona fide offering thereof.

                                      II-4
<PAGE>

                                   SIGNATURES

   Pursuant to the requirements of the Securities Act of 1933, as amended, the
Registrant has duly caused this amendment to the Registration Statement to be
signed on its behalf by the undersigned, thereunto duly authorized, in the City
of Houston, State of Texas, on September 29, 1999.


                                          PLAINS ALL AMERICAN PIPELINE, L.P.

                                          By: Plains All American Inc.,its
                                                general partner

                                                    Greg L. Armstrong*
                                          By___________________________________
                                            Name: Greg L. Armstrong
                                            Title: Chairman of the Board and
                                                  Chief Executive Officer

   PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, AS AMENDED, THIS
REGISTRATION STATEMENT HAS BEEN SIGNED BELOW BY THE FOLLOWING PERSONS IN THE
CAPACITIES AND ON THE DATES INDICATED BELOW.

<TABLE>
<CAPTION>
              Signature                             Title                   Date
              ---------                             -----                   ----
 <C>                                  <S>                            <C>
          Greg L. Armstrong*          Chairman of the Board,         September 29, 1999
 ____________________________________ Chief Executive Officer and
          Greg L. Armstrong           Director (Principal
                                      Executive Officer)
           Harry N. Pefanis*          President, Chief Operating     September 29, 1999
 ____________________________________ Officer and Director
           Harry N. Pefanis
          Phillip D. Kramer*          Executive Vice President and   September 29, 1999
 ____________________________________ Chief Financial Officer
          Phillip D. Kramer           (Principal Financial
                                      Officer)
          Cynthia A. Feeback*         Treasurer (Principal           September 29, 1999
 ____________________________________ Accounting Officer)
          Cynthia A. Feeback
           Everardo Goyanes*          Director                       September 29, 1999
 ____________________________________
           Everardo Goyanes
          Robert V. Sinnott*          Director                       September 29, 1999
 ____________________________________
          Robert V. Sinnott
           Arthur L. Smith*           Director                       September 29, 1999
 ____________________________________
           Arthur L. Smith
</TABLE>

  /s/ Michael R. Patterson
*By: __________________________
     Michael R. Patterson,
     By Power of Attorney

                                      II-5

<PAGE>

                                                                     EXHIBIT 1.1

                       PLAINS ALL AMERICAN PIPELINE, L.P.

                             2,600,000 COMMON UNITS
                     REPRESENTING LIMITED PARTNER INTERESTS

                             UNDERWRITING AGREEMENT
                             ----------------------

                                                             September ___, 1999
SALOMON SMITH BARNEY INC.
GOLDMAN, SACHS & CO.
A.G. EDWARDS & SONS, INC.
FIRST UNION SECURITIES, INC.

c/o SALOMON SMITH BARNEY INC.
     388 Greenwich Street
     New York, New York 10013

Dear Sirs:

     Plains All American Pipeline, L.P., a Delaware limited partnership (the
"Partnership"), proposes to issue and sell an aggregate of 2,600,000 common
units (the "Firm Units") representing limited partner interests in the
Partnership (the "Common Units") to the several underwriters named in Schedule I
hereto (the "Underwriters"), upon the terms and conditions set forth in Section
2 hereof.  The Partnership also proposes to sell to the Underwriters, upon the
terms and conditions set forth in Section 2 hereof, up to an additional 390,000
Common Units (the "Additional Units").  The Firm Units and the Additional Units
are hereinafter collectively referred to as the "Units."

     It is understood and agreed to by all parties that the Partnership was
formed to acquire, own and operate the midstream crude oil business and assets
of Plains Resources Inc., a Delaware corporation ("Plains Resources").  Plains
All American Inc., a Delaware corporation, is the general partner (the "General
Partner") of each of the Partnership, Plains Marketing, L.P., a Delaware limited
partnership ("Plains Marketing"), All American Pipeline, L.P., a Texas limited
partnership ("All American"), and Plains Scurlock Permian, L.P., a Delaware
limited partnership ("Plains Scurlock") (Plains Marketing, All American and
Plains Scurlock are collectively referred to herein as the "Operating
Partnerships"). Plains Scurlock owns a 100% member interest in Scurlock Permian,
LLC, a Delaware limited liability company ("Scurlock Permian"), and Scurlock
Permian owns a 100% member interest in Scurlock Permian Pipe Line, LLC, a
Delaware limited liability company ("Scurlock Permian Pipe Line")(Scurlock
Permian and Scurlock Permian Pipe Line are collectively referred to herein as
the "Operating LLCs" and the Operating Partnerships and the Operating LLCs are
collectively referred to herein as the "Subsidiaries"). The General Partner owns
all 1,307,190 of the outstanding Class B Common Units (the "Class B Units")
representing limited partnership interests in the Partnership.  Plains Resources
owns all of the issued and outstanding stock of the
<PAGE>

General Partner. PAAI LLC, a Delaware limited liability company ("PAAI LLC"), is
a wholly owned subsidiary of the General Partner, and owns all 10,029,619 of the
outstanding subordinated limited partner interests of the Partnership (the
"Subordinated Units") and 6,974,239 Common Units representing limited partner
interests in the Partnership. The Partnership, the General Partner, PAAI and the
Subsidiaries are collectively referred to herein as the "Plains Parties."

     The Plains Parties wish to confirm as follows their agreement with you in
connection with the several purchases of the Units by the Underwriters.

     1.   Registration Statement and Prospectus.  The Partnership has prepared
and filed with the Securities and Exchange Commission (the "Commission") in
accordance with the provisions of the Securities Act of 1933, as amended, and
the rules and regulations of the Commission thereunder (collectively, the
"Act"), a registration statement on Form S-1 under the Act (Commission File No.
333-86907) (the "registration statement"), including a prospectus subject to
completion relating to the Units.  The term "Registration Statement" as used in
this Agreement means the registration statement (including all financial
schedules and exhibits), as amended at the time it becomes effective, or, if the
registration statement became effective prior to the execution of this
Agreement, as supplemented or amended prior to the execution of this Agreement.
If it is contemplated, at the time this Agreement is executed, that a post-
effective amendment to the registration statement will be filed and must be
declared effective before the offering of the Units may commence, the term
"Registration Statement" as used in this Agreement means the registration
statement as amended by said post-effective amendment.  If it is contemplated,
at the time this Agreement is executed, that a registration statement or a post-
effective amendment will be filed pursuant to Rule 462(b) or Rule 462(d) under
the Act before the offering of the Units may commence, the term "Registration
Statement" as used in this Agreement includes such registration statement.  The
term "Prospectus" as used in this Agreement means the prospectus in the form
included in the Registration Statement, or, if the prospectus included in the
Registration Statement omits information in reliance on Rule 430A under the Act
and such information is included in a prospectus filed with the Commission
pursuant to Rule 424(b) under the Act, the term "Prospectus" as used in this
Agreement means the prospectus in the form included in the Registration
Statement as supplemented by the addition of the Rule 430A information contained
in the prospectus filed with the Commission pursuant to Rule 424(b).  The term
"Prepricing Prospectus" as used in this Agreement means the preliminary
prospectus dated September 22, 1999, relating to the Common Units as such
preliminary prospectus shall have been amended from time to time prior to the
date of the Prospectus.

     2.   Purchase and Sale.  (a) Subject to the terms and conditions and in
reliance upon the representations and warranties herein set forth, the
Partnership agrees to sell to each Underwriter, and each Underwriter agrees,
severally and not jointly, to purchase from the Partnership, at a purchase price
of $ _____ per Unit, the amount of  the Firm Units set forth opposite such
Underwriter's name in Schedule I hereto.

     (b)  Subject to the terms and conditions and in reliance upon the
representations and warranties herein set forth, the Partnership hereby grants
an option to the several Underwriters to

                                      -2-
<PAGE>

purchase, severally and not jointly, up to 390,000 Additional Units at the same
purchase price per Unit as the Underwriters shall pay for the Firm Units. Said
option may be exercised only to cover over-allotments in the sale of the Firm
Units by the Underwriters. Said option may be exercised in whole or in part at
any time (but not more than once) on or before the 30th day after the date of
the Prospectus upon written or telegraphic notice by the Underwriters to the
Company setting forth the number of shares of the Additional Units as to which
the several Underwriters are exercising the option and the settlement date. The
number of Additional Units to be purchased by each Underwriter shall be the same
percentage of the total number of shares of the Additional Units to be purchased
by the several Underwriters as such Underwriter is purchasing of the Firm Units,
subject to such adjustments as you in your absolute discretion shall make to
eliminate any fractional shares.

     3.   Delivery and Payment.  Delivery of and payment for the Firm Units and
the Additional Units (if the option provided for in Section 2(b) hereof shall
have been exercised on or before the third business day prior to the Closing
Date) shall be made at 10:00 AM, New York City time, on _____________, 1999, or
at such time on such later date not more than three business days after the
foregoing date as the Underwriters shall designate, which date and time may be
postponed by agreement between the Underwriters and the Partnership (such date
and time of delivery and payment for the Units being herein called the "Closing
Date").  Delivery of the Units shall be made to the Underwriters for the
respective accounts of the several Underwriters against payment by the several
Underwriters of the purchase price thereof to or upon the order of the
Partnership by wire transfer payable in same-day funds to an account specified
by the Partnership.  Delivery of the Firm Units and the Additional Units shall
be made through the facilities of The Depository Trust Company unless the
Underwriters shall otherwise instruct.

     If the option provided for in Section 2(b) hereof is exercised after the
third business day prior to the Closing Date, the Partnership will deliver the
Additional Units (at the expense of the Partnership) to Salomon Smith Barney
Inc., at 388 Greenwich Street, New York, New York, on the date specified by the
Underwriters (which shall be within three business days after exercise of said
option) for the respective accounts of the several Underwriters, against payment
by the several Underwriters of the purchase price thereof to or upon the order
of the Partnership by wire transfer payable in same-day funds to an account
specified by the Partnership.  If settlement for the Additional Units occurs
after the Closing Date, the Partnership will deliver to the Underwriters on the
settlement date for the Additional Units, and the obligation of the Underwriters
to purchase the Additional Units shall be conditioned upon receipt of,
supplemental opinions, certificates and letters confirming as of such date the
opinions, certificates and letters delivered on the Closing Date pursuant to
Section 8 hereof.

     4.   Offering by Underwriters.  It is understood that the several
Underwriters propose to offer the Securities for sale to the public as set forth
in the Prospectus.

     5.   Agreements of the Plains Parties.  Each of the Plains Parties, jointly
and severally, agrees with the Underwriters as follows:

                                      -3-
<PAGE>

          (a) If, at the time this Agreement is executed and delivered, it is
necessary for the Registration Statement or a post-effective amendment thereto
to be declared effective before the offering of the Units may commence, the
Partnership and the General Partner will endeavor to cause the Registration
Statement or such post-effective amendment to become effective as soon as
possible and will advise you promptly and, if requested by you, will confirm
such advice in writing when the Registration Statement or such post-effective
amendment has become effective.

          (b) The Partnership will advise you promptly and, if requested by you,
will confirm such advice in writing: (i) of any request by the Commission for
amendment of or a supplement to the Registration Statement, any Prepricing
Prospectus or the Prospectus or for additional information; (ii) of the issuance
by the Commission of any stop order suspending the effectiveness of the
Registration Statement or of the suspension of qualification of the Units for
offering or sale in any jurisdiction or the initiation of any proceeding for
such purpose; and (iii) within the period of time referred to in paragraph (f)
below, of any change in the condition (financial or other), business, prospects,
properties, net worth or results of operations of the Plains Parties, taken as a
whole, or of the happening of any event which makes any statement of a material
fact made in the Registration Statement or the Prospectus (as then amended or
supplemented) untrue or which requires the making of any additions to or changes
in the Registration Statement or the Prospectus (as then amended or
supplemented) in order to state a material fact required by the Act or the
regulations thereunder to be stated therein or necessary in order to make the
statements therein not misleading, or of the necessity to amend or supplement
the Prospectus (as then amended or supplemented) to comply with the Act or any
other applicable law.  If at any time the Commission shall issue any stop order
suspending the effectiveness of the Registration Statement, the Partnership and
the General Partner will make every commercially reasonable effort to obtain the
withdrawal of such order at the earliest possible time.

          (c) The Partnership will furnish to you, without charge, (i) two EDGAR
versions of the registration statement as originally filed with the Commission
and of each amendment thereto, including financial statements and all exhibits
to the registration statement, (ii) two manually signed copies of the
registration statement corresponding to the EDGAR version filed with the
Commission and of each amendment thereto, including financial statements and all
exhibits to the registration statement, and (iii) such number of conformed
copies of the registration statement as originally filed and of each amendment
thereto, but without exhibits, as you or your counsel may reasonably request.

          (d) The Partnership will not (i) file any amendment to the
Registration Statement or make any amendment or supplement to the Prospectus of
which you shall not previously have been advised or to which you or your counsel
shall reasonably object in writing after being so advised unless the Partnership
shall have determined based on the advice of counsel that such amendment or
supplement is required by law or (ii) so long as, in the opinion of counsel for
the Underwriters, a Prospectus is required to be delivered in connection with
sales by any Underwriter or dealer, file any information, documents or reports
pursuant to the Securities Exchange Act of 1934, as amended (the "Exchange
Act"), without delivering a copy of such information, documents or reports to
you, prior to or concurrently with such filing.

                                      -4-
<PAGE>

          (e) Prior to the execution and delivery of this Agreement, the
Partnership has delivered to you, without charge, in such quantities as you have
reasonably requested, copies of each form of the Prepricing Prospectus.  The
Partnership consents to the use, in accordance with the provisions of the Act
and with the securities or Blue Sky laws of the jurisdictions in which the Units
are offered by the Underwriters and by dealers, prior to the date of the
Prospectus, of each Prepricing Prospectus so furnished by the Partnership.

          (f) As soon after the execution and delivery of this Agreement as
possible and thereafter from time to time for such period as in the opinion of
counsel for the Underwriters a prospectus is required by the Act to be delivered
in connection with sales by any Underwriter or dealer, the Partnership will
expeditiously deliver to each Underwriter and each dealer that you may specify,
without charge, as many copies of the Prospectus (and of any amendment or
supplement thereto) as you may reasonably request.  At any time after nine
months after the time of issuance of the Prospectus, upon request, but at your
expense, the Partnership will deliver as many copies of an amended or
supplemented Prospectus complying with Section 10(a)(3) of the Act as you may
reasonably request, provided that a prospectus is required by the Act to be
delivered in connection with sales of Units by any Underwriter or dealer.  The
Partnership consents to the use of the Prospectus (and of any amendment or
supplement thereto) in accordance with the provisions of the Act and with the
securities or Blue Sky laws of the jurisdictions in which the Units are offered
by the Underwriters and by all dealers to whom Units may be sold, both in
connection with the offering and sale of the Units and for such period of time
thereafter as the Prospectus is required by the Act to be delivered in
connection with sales by any Underwriter or dealer.  If during such period of
time any event shall occur that in the judgment of the Partnership or in the
opinion of counsel for the Underwriters and the Partnership is required to be
set forth in the Prospectus (as then amended or supplemented) or should be set
forth therein in order to make the statements therein, in the light of the
circumstances under which they were made, not misleading, or if it is necessary
to supplement or amend the Prospectus to comply with the Act or any other law,
the Partnership will forthwith prepare and, subject to the provisions of
paragraph (d) above, file with the Commission an appropriate supplement or
amendment thereto, and will expeditiously furnish to the Underwriters and
dealers a reasonable number of copies thereof; provided that, if any such event
necessitating a supplement or amendment to the Prospectus occurs at any time
after nine months after the time of issuance of the Prospectus, such supplement
or amendment shall be prepared at your expense.  In the event that the
Partnership and you agree that the Prospectus should be amended or supplemented,
the Partnership, if requested by you, will promptly issue a press release
announcing or disclosing the matters to be covered by the proposed amendment or
supplement unless the Partnership shall have determined, based on the advice of
counsel, that the issuance of such press release would not be required by law.

          (g) The Partnership and the General Partner will cooperate with you
and with counsel for the Underwriters in connection with the registration or
qualification of the Units for offering and sale by the Underwriters and by
dealers under the securities or Blue Sky laws of such jurisdictions as you may
reasonably designate and will file such consents to service of process or other
documents reasonably necessary or appropriate in order to effect such
registration or

                                      -5-
<PAGE>

qualification; provided that in no event shall any Plains Party be obligated to
qualify to do business in any jurisdiction where it is not now so qualified or
to take any action which would subject it to service of process in suits, other
than those arising out of the offering or sale of the Units, in any jurisdiction
where it is not now so subject.

          (h) The Partnership will make generally available to its security
holders a consolidated earnings statement, which need not be audited, covering a
twelve-month period commencing after the effective date of the Registration
Statement and ending not later than 15 months thereafter, as soon as practicable
after the end of such period, which consolidated earnings statement shall
satisfy the provisions of Section 11(a) of the Act.

          (i) During the period of two years hereafter, the Partnership will
furnish to you (i) as soon as publicly available, a copy of each report of the
Partnership mailed to unitholders or filed with the Commission or the principal
national securities exchange or automated quotation system upon which the Units
may be listed, and (ii) from time to time such other information concerning the
Partnership as you may reasonably request.

          (j) If this Agreement shall terminate or shall be terminated after
execution pursuant to any provisions hereof (otherwise than pursuant to the
second paragraph of Section 10 hereof or by notice given by you terminating this
Agreement pursuant to Section 10 or Section 11 hereof) or if this Agreement
shall be terminated by the Underwriters because of any failure or refusal on the
part of any of the Plains Parties to comply with the terms or fulfill any of the
conditions of this Agreement, the Plains Parties, jointly and severally, agree
to reimburse the Underwriters for all reasonable out-of-pocket expenses
(including reasonable fees and expenses of counsel for the Underwriters)
incurred by you in connection herewith.

          (k) The Partnership and the Subsidiaries will apply the net proceeds
from the sale of the Units in accordance with the description set forth under
the caption "Use of Proceeds" in the Prospectus.

          (l) If Rule 430A of the Act is employed, the Partnership will timely
file the Prospectus pursuant to Rule 424(b) under the Act and will advise you of
the time and manner of such filing.

          (m) Except as provided in this Agreement, the Plains Parties will not
(i) offer, sell, contract to sell or otherwise dispose of any Common Units or
Subordinated Units, any securities that are convertible into, or exercisable or
exchangeable for, or that represent the right to receive, Common Units or
Subordinated Units or any securities that are senior to or pari passu with
Common Units, or (ii) grant any options or warrants to purchase Common Units or
Subordinated Units (other than the grant of Unit Options or Restricted Units
pursuant to the Plains All American Pipeline, L.P. 1998 Long-Term Incentive
Plan), for a period of 90 days after the date of the Prospectus without the
prior written consent of Salomon Smith Barney Inc., except for the issuance of
Units pursuant to this Agreement and the issuance of Common Units pursuant to
Section 5.7(b) of the Amended and

                                      -6-
<PAGE>

Restated Agreement of Limited Partnership of the Partnership (as the same may be
amended or restated prior to the Closing Date, the "Partnership Agreement").

          (n) Except as stated in this Agreement and in the Prepricing
Prospectus and Prospectus, the Plains Parties have not taken, and will not take,
directly or indirectly, any action designed to or that might reasonably be
expected to cause or result in stabilization or manipulation of the price of the
Common Units to facilitate the sale or resale of the Units.

          (o) Each of the Plains Parties will take such steps as shall be
necessary to ensure that none of them shall become an "investment company"
within the meaning of such term under the Investment Company Act of 1940, as
amended, and the rules and regulations of the Commission thereunder.

          (p) The Partnership shall timely complete all required filings and
otherwise fully comply in a timely manner with all provisions of the Exchange
Act, including the rules and regulations thereunder, in connection with the
registration of the Units thereunder.

     6.   Representations and Warranties of the Plains Parties.  The Plains
Parties, jointly and severally, represent and warrant to each Underwriter that:

          (a) Any Prepricing Prospectus, at the date of filing thereof with the
Commission, complied in all material respects with the requirements of the Act
and did not contain an untrue statement of a material fact or omit to state a
material fact required to be stated therein or necessary in order to make the
statements therein, in the light of the circumstances under which they were
made, not misleading.  The Commission has not issued any order preventing or
suspending the use of any Prepricing Prospectus.  The Registration Statement in
the form in which it became or becomes effective and also in such form as it may
be when any post-effective amendment thereto shall become effective and the
Prospectus and any supplement or amendment thereto when filed with the
Commission under Rule 424(b) under the Act complied or will comply in all
material respects with the provisions of the Act and did not or will not at any
such times contain an untrue statement of a material fact or omit to state a
material fact required to be stated therein or necessary to make the statements
therein not misleading.  Each of the statements made by the Partnership in such
documents within the coverage of Rule 175(b) of the rules and regulations under
the Act, including (but not limited to) any statements with respect to future
available cash or future cash distributions of the Partnership or the
anticipated ratio of taxable income to distributions was made or will be made
with a reasonable basis and in good faith.  Notwithstanding the foregoing, no
representation or warranty is made as to statements in or omissions from the
Registration Statement, the Prospectus or any Prepricing Prospectus made in
reliance upon and in conformity with information furnished to the Partnership in
writing by or on behalf of any Underwriter through you expressly for use
therein.

          (b) Each of the Partnership, Plains Marketing and Plains Scurlock has
been duly formed and is validly existing in good standing as a limited
partnership under the Delaware Revised

                                      -7-
<PAGE>

Uniform Limited Partnership Act (the "Delaware LP Act") with full partnership
power and authority to own or lease its properties and to conduct its business,
in each case in all material respects as described in the Registration Statement
and the Prospectus. Each of the Partnership, Plains Marketing and Plains
Scurlock is duly registered or qualified as a foreign limited partnership for
the transaction of business under the laws of each jurisdiction in which the
character of the business conducted by it or the nature or location of the
properties owned or leased by it makes such registration or qualification
necessary, except where the failure so to register or qualify would not (i) have
a material adverse effect on the condition (financial or other), business,
prospects, properties, net worth or results of operations of the Partnership and
the Subsidiaries, taken as a whole, or (ii) subject the limited partners of the
Partnership to any material liability or disability.

          (c) All American has been duly formed and is validly existing in good
standing as a limited partnership under the Texas Revised Uniform Limited
Partnership Act (the "Texas LP Act") with full partnership power and authority
to own or lease its properties and to conduct its business, in each case in all
material respects as described in the Registration Statement and the Prospectus.
All American is duly registered or qualified as a foreign limited partnership
for the transaction of business under the laws of each jurisdiction in which the
character of the business conducted by it or the nature or location of the
properties owned or leased by it makes such registration or qualification
necessary, except where the failure so to register or qualify would not (i) have
a material adverse effect on the condition (financial or other), business,
prospects, properties, net worth or results of operations of the Partnership and
the Subsidiaries, taken as a whole, or the General Partner or (ii) subject the
limited partners of the Partnership to any material liability or disability.

          (d) The General Partner has been duly incorporated and is validly
existing in good standing under the laws of the State of Delaware with full
corporate power and authority to own or lease its properties, to conduct its
business and to act as general partner of the Partnership and the Operating
Partnerships,  in each case in all material respects as described in the
Registration Statement and the Prospectus.  The General Partner is duly
registered or qualified as a foreign corporation for the transaction of business
under the laws of each jurisdiction in which the character of the business
conducted by it or the nature or location of the properties owned or leased by
it makes such registration or qualification necessary, except where the failure
so to register or qualify would not (i) have a material adverse effect on the
condition (financial or other), business, prospects, properties, net worth or
results of operations of the Partnership and the Subsidiaries, taken as a whole,
or the General Partner or (ii) subject the limited partners of the Partnership
to any material liability or disability.

          (e) Plains Resources has been duly incorporated and is validly
existing in good standing under the laws of the State of Delaware with full
corporate power and authority to own or lease its properties and to conduct its
business, in each case in all material respects as described in the Registration
Statement and the Prospectus.

          (f) PAAI LLC has been duly formed and is validly existing in good
standing as

                                      -8-
<PAGE>

a limited liability company under the Delaware Limited Liability Company Act
(the "Delaware LLC Act") with full limited liability company power and authority
to own or lease its properties and to conduct its business, in each case in all
material respects as described in the Registration Statement and the Prospectus.
PAAI LLC is duly registered or qualified as a foreign limited liability company
for the transaction of business under the laws of each jurisdiction in which the
character of the business conducted by it or the nature or location of the
properties owned or leased by it makes such registration or qualification
necessary, except where the failure so to register or qualify would not (i) have
a material adverse effect on the condition (financial or other), business,
prospects, properties, net worth or results of operations of the Partnership and
the Subsidiaries, taken as a whole or PAAI LLC or (ii) subject the limited
partners of the Partnership to any material liability or disability.

          (g) Each of Scurlock Permian and Scurlock Permian Pipeline has been
duly formed and is validly existing in good standing as a limited liability
company under the Delaware LLC Act with full limited liability company power and
authority to own or lease its properties and to conduct its business.  Each of
Scurlock Permian and Scurlock Permian Pipe Line is duly registered or qualified
as a foreign limited liability company for the transaction of business under the
laws of each jurisdiction in which the character of the business conducted by it
or the nature or location of the properties owned or leased by it makes such
registration or qualification necessary, except where the failure so to register
or qualify would not (i) have a material adverse effect on the condition
(financial or other), business, prospects, properties, net worth or results of
operations of the Partnership and the Subsidiaries, taken as a whole or (ii)
subject the limited partners of the Partnership to any material liability or
disability.

          (h) The General Partner is the sole general partner of the
Partnership, with a 1% general partner interest in the Partnership; such general
partner interest has been duly authorized and validly issued in accordance with
the Partnership Agreement; the General Partner owns all of the Incentive
Distribution Rights and all of the Class B Units; such Incentive Distribution
Rights and Class B Units are duly authorized and validly issued in accordance
with the Partnership Agreement and are fully paid (to the extent required under
the Partnership Agreement) and nonassessable (except as such nonassessability
may be affected by matters described in the Prospectus under the caption "The
Partnership Agreement--Limited Liability"); and the General Partner owns such
general partner interest, Incentive Distribution Rights and Class B Units free
and clear of all liens, encumbrances, security interests, equities, charges or
claims.

          (i) PAAI LLC owns 6,974,239 Common Units and 10,029,619 Subordinated
Units (the "Sponsor Units"); all of such Sponsor Units and the limited partner
interests represented thereby have been duly authorized and validly issued in
accordance with the Partnership Agreement, and are fully paid (to the extent
required under the Partnership Agreement) and nonassessable (except as such
nonassessability may be affected by matters described in the Prospectus under
the caption "The Partnership Agreement--Limited Liability"); and PAAI LLC owns
such Common Units and Subordinated Units free and clear of all liens,
encumbrances, security interests, equities, charges or claims.

                                      -9-
<PAGE>

          (j) At the Closing Date, there will be issued to the Underwriters the
Firm Units (assuming no purchase by the Underwriters of Additional Units); at
the Closing Date or the Option Closing Date, as the case may be, the Firm Units
or the Additional Units, as the case may be, and the limited partner interests
represented thereby will be duly authorized by the Partnership Agreement and,
when issued and delivered to the Underwriters against payment therefor in
accordance with the terms hereof, will be validly issued, fully paid (to the
extent required under the Partnership Agreement) and nonassessable (except as
such nonassessability may be affected by matters described in the Prospectus
under the caption "The Partnership Agreement--Limited Liability"); other than
the Sponsor Units owned by PAAI LLC and the Incentive Distribution Rights and
Class B Units owned by the General Partner, the Units will be the only limited
partner interests of the Partnership issued and outstanding at the Closing Date.

          (k) The General Partner is the sole general partner of Plains
Marketing with a 1.0101% general partner interest in Plains Marketing; such
general partner interest has been duly authorized and validly issued in
accordance with the Agreement of Limited Partnership of Plains Marketing (as the
same may be amended and restated at or prior to the Closing Date, the "Plains
Marketing Partnership Agreement"); and the General Partner owns such general
partner interest free and clear of all liens, encumbrances, security interests,
equities, charges or claims.

          (l) The General Partner is the sole general partner of All American
with a .001% general partner interest in All American; such general partner
interest has been duly authorized and validly issued in accordance with the
Agreement of Limited Partnership of All American (as the same may be amended and
restated at or prior to the Closing Date, the "All American Partnership
Agreement"); and the General Partner owns such general partner interest free and
clear of all liens, encumbrances, security interests, equities, charges or
claims.

          (m) The General Partner is the sole general partner of Plains Scurlock
with a .001% general partner interest in Plains Scurlock; such general partner
interest has been duly authorized and validly issued in accordance with the
Agreement of Limited Partnership of Plains Scurlock (as the same may be amended
and restated at or prior to the Closing Date, the "Plains Scurlock Partnership
Agreement" and, together with the Partnership Agreement, the Plains Marketing
Partnership Agreement and the All American Partnership Agreement, the
"Partnership Agreements"); and the General Partner owns such general partner
interest free and clear of all liens, encumbrances, security interests,
equities, charges or claims.

          (n) The Partnership is the sole limited partner of Plains Marketing
with a 98.9899% limited partner interest in Plains Marketing; such limited
partner interest has been duly authorized and validly issued in accordance with
the Plains Marketing Partnership Agreement and is fully paid (to the extent
required under the Plains Marketing Partnership Agreement) and nonassessable
(except as such nonassessability may be affected by matters described in the
Prospectus under the caption "The Partnership Agreement--Limited Liability");
and the Partnership owns such limited partner interest free and clear of all
liens, encumbrances, security interests, equities, charges or claims, except as
provided in the Bank Credit Agreement dated November 17,

                                      -10-
<PAGE>

1998 between All American, Plains Marketing and the Partnership and the lenders
named therein (as amended, the "Plains Bank Credit Agreement") and the Letter of
Credit Facility dated November 17, 1998 between All American, Plains Marketing
and the Partnership and the lenders named therein (as amended, the "Plains
Letter of Credit Facility").

          (o) Plains Marketing is the sole limited partner of All American with
a 99.999% limited partner interest in All American; such limited partner
interest has been duly authorized and validly issued in accordance with the All
American Partnership Agreement and is fully paid (to the extent required under
the All American Partnership Agreement) and nonassessable (except as such
nonassessability may be affected by Section 6.07 of the Texas LP Act); and
Plains Marketing owns such limited partner interest free and clear of all liens,
encumbrances, security interests, equities, charges or claims, except as
provided in the Plains Bank Credit Agreement and the Plains Letter of Credit
Facility.

          (p) Plains Marketing is the sole limited partner of Plains Scurlock
with a 99.999% limited partner interest in Plains Scurlock; such limited partner
interest has been duly authorized and validly issued in accordance with the
Plains Scurlock Partnership Agreement and is fully paid (to the extent required
under the Plains Scurlock Partnership Agreement) and nonassessable (except as
such nonassessability may be affected by matters described in the Prospectus
under the caption "The Partnership Agreement--Limited Liability"); and Plains
Marketing owns such limited partner interest free and clear of all liens,
encumbrances, security interests, equities, charges or claims, except as
provided in the Bank Credit Agreement dated May 12, 1999 between Plains Scurlock
and the lenders named therein (as amended, the "Plains Scurlock Bank Credit
Agreement").

          (q) Plains Resources owns 100% of the issued and outstanding capital
stock of the General Partner; such capital stock has been duly authorized and
validly issued and is fully paid and nonassessable; and Plains Resources owns
such capital stock free and clear of all liens, encumbrances, security
interests, equities, charges or claims.

          (r) The General Partner owns a 100% member interest in PAAI LLC; such
member interest has been duly authorized and validly issued in accordance with
the Limited Liability Company Agreement of PAAI LLC (as the same may be amended
and restated at or prior to the Closing Date, the "PAAI LLC Agreement") and is
fully paid (to the extent required under the PAAI LLC Agreement) and
nonassessable (except as such nonassessability may be affected by Section 18-607
of the Delaware LLC Act); and the General Partner owns such member interest free
and clear of all liens, encumbrances, security interests, equities, charges or
claims.

          (s) Plains Scurlock owns a 100% member interest in Scurlock Permian;
such member interest has been duly authorized and validly issued in accordance
with the Limited Liability Company Agreement of Scurlock Permian (as the same
may be amended and restated at or prior to the Closing Date, the "Scurlock
Permian LLC Agreement") and is fully paid (to the extent required under the
Scurlock Permian LLC Agreement) and nonassessable (except as such
nonassessability

                                      -11-
<PAGE>

may be affected by Section 18-607 of the Delaware LLC Act); and Plains Scurlock
owns such member interest free and clear of all liens, encumbrances, security
interests, equities, charges or claims.

          (t) Scurlock Permian owns a 100% member interest in Scurlock Permian
Pipe Line; such member interest has been duly authorized and validly issued in
accordance with the Limited Liability Company Agreement of Scurlock Permian Pipe
Line (as the same may be amended and restated at or prior to the Closing Date,
the "Scurlock Permian Pipe Line LLC Agreement" and together with the PAAI LLC
Agreement, the Scurlock Permian LLC Agreement and the Partnership Agreements,
the "Organization Agreements") and will be fully paid (to the extent required
under the Scurlock Permian Pipe Line LLC Agreement) and nonassessable (except as
such nonassessability may be affected by Section 18-607 of the Delaware LLC
Act); and Scurlock Permian owns such member interest free and clear of all
liens, encumbrances, security interests, equities, charges or claims.

          (u) None of the Plains Parties has any subsidiaries (other than a
Plains Party) which, individually or considered as a whole, would be deemed to
be a significant subsidiary (as such term is defined in Rule 405 under the Act).

          (v) Except as described in the Prospectus, there are no preemptive
rights or other rights to subscribe for or to purchase, nor any restriction upon
the voting or transfer of, any interests in the Partnership or any Subsidiary
pursuant to any of the Organization Agreements, or any agreement or other
instrument to which the Partnership or any Subsidiary is a party or by which any
one of them may be bound.  Neither the filing of the Registration Statement nor
the offering or sale of the Units as contemplated by this Agreement gives rise
to any rights for or relating to the registration of any Units or other
securities of the Partnership or any Subsidiary.  Except as described in the
Prospectus, there are no outstanding options or warrants to purchase any Common
Units or Subordinated Units or other partnership interests in the Partnership or
any Subsidiary.  The Units, when issued and delivered against payment therefor
as provided herein, will conform in all material respects to the description
thereof contained in the Prospectus.  The Partnership has all requisite power
and authority to issue, sell and deliver the Units, in accordance with and upon
the terms and conditions set forth in this Agreement, the Partnership Agreement
and the Registration Statement and Prospectus.  At the Closing Date and the
Option Closing Date, all corporate and partnership action, as the case may be,
required to be taken by the Plains Parties or any of their stockholders,
partners or members for the authorization, issuance, sale and delivery of the
Units shall have been validly taken.

          (w) The execution and delivery of, and the performance by each of the
Plains Parties of their respective obligations under, this Agreement have been
duly and validly authorized by each of the Plains Parties, and this Agreement
has been duly executed and delivered by each of the Plains Parties, and
constitutes the valid and legally binding agreement of each of the Plains
Parties, enforceable against each of the Plains Parties in accordance with its
terms, provided that the enforceability thereof may be limited by bankruptcy,
insolvency, fraudulent transfer, reorganization,

                                      -12-
<PAGE>

moratorium and similar laws relating to or affecting creditors' rights generally
and by general principles of equity (regardless of whether such enforceability
is considered in a proceeding in equity or at law) and except as rights to
indemnity and contribution hereunder may be limited by federal or state
securities laws.

          (x) The Partnership Agreement has been duly authorized, executed and
delivered by the General Partner and is a valid and legally binding agreement of
the General Partner, enforceable against the General Partner in accordance with
its terms; the Plains Marketing Partnership Agreement has been duly authorized,
executed and delivered by each of the General Partner and the Partnership, and
is a valid and legally binding agreement of the General Partner and the
Partnership, enforceable against each of them in accordance with its terms; the
All American Partnership Agreement has been duly authorized, executed and
delivered by each of the General Partner and Plains Marketing and is a valid and
legally binding agreement of the General Partner and Plains Marketing
enforceable against each of them in accordance with its terms; the Plains
Scurlock Partnership Agreement has been duly authorized, executed and delivered
by each of the General Partner and Plains Marketing and is a valid and legally
binding agreement of the General Partner and Plains Marketing enforceable
against each of them in accordance with its terms; the Scurlock Permian LLC
Agreement has been duly authorized, executed and delivered by Plains Scurlock
and is a valid and legally binding agreement of Plains Scurlock enforceable
against it in accordance with its terms; the Scurlock Permian Pipe Line LLC
Agreement has been duly authorized, executed and delivered by Scurlock Permian
and is a valid and legally binding agreement of Scurlock Permian enforceable
against it in accordance with its terms; provided that, with respect to each
such agreement, the enforceability thereof may be limited by bankruptcy,
insolvency, fraudulent transfer, reorganization, moratorium and similar laws
relating to or affecting creditors' rights generally and by general principles
of equity (regardless of whether such enforceability is considered in a
proceeding in equity or at law).

          (y) None of the offering, issuance and sale by the Partnership of the
Units, the execution, delivery and performance of this Agreement by the Plains
Parties which are parties thereto, or the consummation of the transactions
contemplated hereby (i) conflicts or will conflict with or constitutes or will
constitute a violation of the agreement of limited partnership, limited
liability company agreement, certificate or articles of incorporation or bylaws
or other organizational documents of any of the Plains Parties, (ii) conflicts
or will conflict with or constitutes or will constitute a breach or violation
of, or a default under (or an event which, with notice or lapse of time or both,
would constitute such an event), any indenture, mortgage, deed of trust, loan
agreement, lease or other agreement or instrument to which any of the Plains
Parties is a party or by which any of them or any of their respective properties
may be bound, (iii) violates or will violate any statute, law or regulation or
any order, judgment, decree or injunction of any court or governmental agency or
body directed to any of the Plains Parties or any of their properties in a
proceeding to which any of them or their property is a party or (iv) will result
in the creation or imposition of any lien, charge or encumbrance upon any
property or assets of any of the Plains Parties, in the case of clauses (ii),
(iii) or (iv), which conflicts, breaches, violations or defaults would have a
material adverse effect upon the condition (financial or other), business,
prospects, properties, net worth or results of operations of the Plains Parties,
taken as a whole.

                                      -13-
<PAGE>

          (z) No permit, consent, approval, authorization, order, registration,
filing or qualification of or with any court, governmental agency or body is
required in connection with the execution and delivery of, or the consummation
by the Plains Parties of the transactions contemplated by, this Agreement,
except for such permits, consents, approvals and similar authorizations required
under the Securities Act, the Exchange Act and state securities or "Blue Sky"
laws.

          (aa)  None of the Plains Parties is in (i) violation of its
Organization Agreement, certificate or articles of incorporation or bylaws or
other organizational documents, or of any law, statute, ordinance,
administrative or governmental rule or regulation applicable to it or of any
decree of any court or governmental agency or body having jurisdiction over it
or (ii) breach, default (or an event which, with notice or lapse of time or
both, would constitute such an event) or violation in the performance of any
obligation, agreement or condition contained in any bond, debenture, note or any
other evidence of indebtedness or in any agreement, indenture, lease or other
instrument to which it is a party or by which it or any of its properties may be
bound, which breach, default or violation would, if continued, have a material
adverse effect on the condition (financial or other), business, prospects,
properties, net worth or results of operations of the Plains Parties, taken as a
whole, or could materially impair the ability of any of the Plains Parties to
perform its obligations under this Agreement.  To the knowledge of the Plains
Parties, no third party to any indenture, mortgage, deed of trust, loan
agreement or other agreement or instrument to which any of the Plains Parties is
a party or by which any of them is bound or to which any of their properties are
subject, is in default under any such agreement, which breach, default or
violation would, if continued, have a material adverse effect on the condition
(financial or other), business, prospects, properties, net worth or results of
operations of the Plains Parties, taken as a whole.

          (bb)  The accountants, PricewaterhouseCoopers LLP, who have certified
or shall certify the audited financial statements included in the Registration
Statement, any Prepricing Prospectus and the Prospectus (or any amendment or
supplement thereto), are independent public accountants with respect to the
Plains Parties as required by the Act and the applicable published rules and
regulations thereunder.

          (cc)  At June 30, 1999, the Partnership would have had, on the
consolidated pro forma basis indicated in the Prospectus (and any amendment or
supplement thereto), a capitalization as set forth therein.  The financial
statements (including the related notes and supporting schedules) included in
the Registration Statement, the Prepricing Prospectus dated September 22, 1999
and the Prospectus (and any amendment or supplement thereto) present fairly in
all material respects the financial position,  results of operations and cash
flows of the entities purported to be shown thereby, at the dates and for the
periods indicated, and have been prepared in conformity with generally accepted
accounting principles applied on a consistent basis throughout the periods
indicated, except to the extent disclosed therein.  The selected historical
information set forth in the Registration Statement, the Prepricing Prospectus
dated September 22, 1999 and the Prospectus (and any amendment or supplement
thereto) under the caption "Selected Historical Financial and Operating

                                      -14-
<PAGE>

Data" is accurately presented in all material respects and prepared on a basis
consistent with the audited and unaudited historical consolidated financial
statements from which it has been derived. The selected pro forma information
set forth in the Registration Statement, the Prepricing Prospectus dated
September 22, 1999 and the Prospectus (and any amendment or supplement thereto)
under the caption "Selected Pro Forma Financial and Operating Data" is
accurately presented in all material respects and prepared on a basis consistent
with the pro forma financial statements from which it has been derived. The pro
forma financial statements of the Partnership included in the Registration
Statement, the Prepricing Prospectus dated September 22, 1999 and the Prospectus
(and any amendment or supplement thereto) have been prepared in all material
respects in accordance with the applicable accounting requirements of Article 11
of Regulation S-X of the Commission; the assumptions used in the preparation of
such pro forma financial statements are, in the opinion of the management of the
Plains Parties, reasonable; and the pro forma adjustments reflected in such pro
forma financial statements have been properly applied to the historical amounts
in compilation of such pro forma financial statements.

          (dd) Except as disclosed in the Registration Statement, the Prepricing
Prospectus dated September 22, 1999 and the Prospectus (or any amendment or
supplement thereto), subsequent to the respective dates as of which such
information is given in the Registration Statement, the Prepricing Prospectus
dated September 22, 1999 and the Prospectus (or any amendment or supplement
thereto), (i) none of the Plains Parties has incurred any liability or
obligation, indirect, direct or contingent, or entered into any transactions,
not in the ordinary course of business, that, singly or in the aggregate, is
material to the Plains Parties, taken as a whole, (ii) there has not been any
material change in the capitalization, or material increase in the short-term
debt or long-term debt, of the Plains Parties and (iii) there has not been any
material adverse change, or any development involving or which may reasonably be
expected to involve, singly or in the aggregate, a prospective material adverse
change in the condition (financial or other), business, prospects, properties,
net worth or results of operations of the Plains Parties, taken as a whole.

          (ee) There are no legal or governmental proceedings pending or, to the
knowledge of the Plains Parties, threatened, against any of the Plains Parties,
or to which any of the Plains Parties is a party, or to which any of their
respective properties is subject, that are required to be described in the
Registration Statement or the Prospectus but are not described as required, and
there are no agreements, contracts, indentures, leases or other instruments that
are required to be described in the Registration Statement or the Prospectus or
to be filed as an exhibit to the Registration Statement that are not described
or filed as required by the Act.

          (ff)  The Plains Parties have good and indefeasible title to all real
property and good title to all personal property described in the Prospectus as
being owned by them, free and clear of all liens, claims, security interests or
other encumbrances except (i) as described in the Prospectus and (ii) such as do
not materially interfere with the use of such properties taken as a whole as
described in the Prospectus; and all real property and buildings held under
lease by any of the Plains Parties are held under valid and subsisting and
enforceable leases with such exceptions as do not materially interfere with the
use of such properties taken as a whole as described in the Prospectus.

                                      -15-
<PAGE>

          (gg) The Partnership has not distributed and, prior to the later to
occur of (i) the Closing Date and (ii) completion of the distribution of the
Units, will not distribute, any prospectus (as defined under the Act) in
connection with the offering and sale of the Units other than the Registration
Statement, any Prepricing Prospectus, the Prospectus or other materials, if any,
permitted by the Act, including Rule 134 of the general rules and regulations
thereunder.

          (hh) Each of the Plains Parties has such permits, consents, licenses,
franchises, certificates and authorizations of governmental or regulatory
authorities ("permits") as are necessary to own its properties and to conduct
its business in the manner described in the Prospectus, subject to such
qualifications as may be set forth in the Prospectus and except for such permits
the failure of which to have obtained will not have, individually or in the
aggregate, a material adverse effect upon the ability of the Plains Parties
considered as a whole to conduct their businesses in all material respects as
currently conducted and as contemplated by the Prospectus to be conducted; each
of the Plains Parties has fulfilled and performed all its material obligations
with respect to such permits and no event has occurred which allows, or after
notice or lapse of time would allow, revocation or termination thereof or
results in any impairment of the rights of the holder of any such permit, except
for such revocations, terminations and impairments that will not have a material
adverse effect upon the ability of the Plains Parties considered as a whole to
conduct their businesses in all material respects as currently conducted and as
contemplated by the Prospectus to be conducted, subject in each case to such
qualification as may be set forth in the Prospectus; and, except as described in
the Prospectus, none of such permits contains any restriction that is materially
burdensome to the Plains Parties considered as a whole.

          (ii) Each of the Plains Parties has such consents, easements, rights-
of-way or licenses from any person ("rights-of-way") as are necessary to conduct
its business in the manner described in the Prospectus, subject to such
qualifications as may be set forth in the Prospectus and except for such rights-
of-way the failure of which to have obtained will not have, individually or in
the aggregate, a material adverse effect upon the ability of the Plains Parties
considered as a whole to conduct their businesses in all material respects as
currently conducted and as contemplated by the Prospectus to be conducted; each
of the Plains Parties has fulfilled and performed all its material obligations
with respect to such rights-of-way and no event has occurred which allows, or
after notice or lapse of time would allow, revocation or termination thereof or
would result in any impairment of the rights of the holder of any such rights-
of-way, except for such revocations, terminations and impairments that will not
have a material adverse effect upon the ability of the Plains Parties considered
as a whole to conduct their businesses in all material respects as currently
conducted and as contemplated by the Prospectus to be conducted, subject in each
case to such qualification as may be set forth in the Prospectus; and, except as
described in the Prospectus, none of such rights-of-way contains any restriction
that is materially burdensome to the Plains Parties considered as a whole.

          (jj) Each of the Partnership and the General Partner (i) makes and
keeps books, records and accounts, which, in reasonable detail, accurately and
fairly reflect the transactions and

                                      -16-
<PAGE>

dispositions of assets and (ii) maintains systems of internal accounting
controls sufficient to provide reasonable assurances that (A) transactions are
executed in accordance with management's general or specific authorization; (B)
transactions are recorded as necessary to permit preparation of financial
statements in conformity with generally accepted accounting principles and to
maintain accountability for assets; (C) access to assets is permitted only in
accordance with management's general or specific authorization; and (D) the
recorded accountability for assets is compared with existing assets at
reasonable intervals and appropriate action is taken with respect to any
differences.

          (kk) Each of the Plains Parties has filed (or has obtained extensions
with respect to) all material tax returns required to be filed through the date
hereof, which returns are complete and correct in all material respects, and has
timely paid all taxes shown to be due pursuant to such returns, other than those
(i) which, if not paid, would not have a material adverse effect on the
condition (financial or other), business, prospects, properties, net worth or
results of operations of the Plains Parties, taken as a whole, or (ii) which are
being contested in good faith.

          (ll) None of the Plains Parties is now, and after sale of the Units to
be sold by the Partnership hereunder and application of the net proceeds from
such sale as described in the Prospectus under the caption "Use of Proceeds,"
none of the Plains Parties will be, (i) an "investment company" or a company
"controlled by" an "investment company" within the meaning of the Investment
Company Act of 1940, as amended, (ii) a "public utility company," "holding
company" or a "subsidiary company" of a "holding company" or an "affiliate"
thereof, under the Public Utility Holding Company Act of 1935, as amended, (iii)
a "gas utility," "public utility" or "utility" within the meaning of Article
6050 of the Revised Civil Statutes of Texas or (iv) a "public utility" or
"utility" within the meaning of the Public Utility Regulatory Act of Texas or
under the applicable laws of any state in which any such Plains Party does
business.

          (mm) None of the Plains Parties has sustained since the date of the
latest audited financial statements included in the Prospectus any material loss
or interference with its business from fire, explosion, flood or other calamity
whether or not covered by insurance, or from any labor dispute or court or
governmental action, investigation, order or decree, otherwise than as set forth
or contemplated in the Prospectus.

          (nn) The Partnership has reviewed its operations and that of the
Subsidiaries and is in the process of reviewing the relevant operations of third
parties with which the Partnership or any of the Subsidiaries has a material
relationship to evaluate the extent to which the business or operations of the
Partnership or any of the Subsidiaries will be affected by the Year 2000
Problem. As a result of such review, the Partnership has no reason to believe,
and does not believe, that the Year 2000 Problem will have a material adverse
effect on the condition (financial or other), business, prospects, properties,
net worth or results of operations of the Partnership and the Subsidiaries,
taken as a whole.  The "Year 2000 Problem" as used herein means any significant
risk that computer hardware or software used in the receipt, transmission,
processing, manipulation, storage, retrieval, retransmission or other
utilization of data or in the operation of mechanical or electrical systems of
any kind will not, in the case of dates or time periods occurring after December
31, 1999, function

                                      -17-
<PAGE>

at least as effectively as in the case of dates or time periods occurring prior
to January 1, 2000.

          (oo) There has been no storage, disposal, generation, manufacture,
refinement, transportation, handling or treatment of toxic wastes, medical
wastes, hazardous wastes or hazardous substances by any of the Plains Parties or
Plains Resources (or, to the knowledge of the Plains Parties, any of their
predecessors in interest) at, upon or from any of the property now or previously
owned or leased by the Partnership or any of the Subsidiaries in violation of
any applicable law, ordinance, rule, regulation, order, judgment, decree or
permit or which would require remedial action under any applicable law,
ordinance, rule, regulation, order, judgment, decree or permit, except for any
violation or remedial action which would not have, or could not be reasonably
likely to have, singularly or in the aggregate with all such violations and
remedial actions, a material adverse effect on the condition (financial or
other), business, prospects, properties, net worth or results of operations of
the Partnership and the Subsidiaries, taken as a whole; there has been no
material spill, discharge, leak, emission, injection, escape, dumping or release
of any kind onto such property or into the environment surrounding such property
of any toxic wastes, medical wastes, solid wastes, hazardous wastes or hazardous
substances due to or caused by any of the Plains Parties or Plains Resources
(or, to the knowledge of the Plains Parties, any of their predecessors in
interest) or with respect to which the any of the Plains Parties have knowledge,
except for any such spill, discharge, leak, emission, injection, escape, dumping
or release which would not have or would not be reasonably likely to have,
singularly or in the aggregate with all such spills, discharges, leaks,
emissions, injections, escapes, dumpings and releases, a material adverse effect
on the condition (financial or other), business, prospects, properties, net
worth or results of operations of the Partnership and the Subsidiaries, taken as
a whole; and their terms "hazardous waster," "toxic wastes," "hazardous
substances" and "medical wastes" shall have the meanings specified in any
applicable local, state, federal and foreign laws or regulations with respect to
environmental protection.

          (pp) Except as described in the Prospectus, no labor dispute by the
employees of any of the Plains Parties exists or, to the knowledge of the Plains
Parties, is imminent, which might reasonably be expected to have a material
adverse effect on the condition (financial or other), business, prospects,
properties, net worth or results of operations of the Partnership and the
Subsidiaries, taken as a whole.

          (qq) The Plains Parties maintain insurance covering their properties,
operations, personnel and businesses against such losses and risks as are
reasonably adequate to protect them and their businesses in a manner consistent
with other businesses similarly situated.  None of the Plains Parties has
received notice from any insurer or agent of such insurer that substantial
capital improvements or other expenditures will have to be made in order to
continue such insurance, and all such insurance is outstanding and duly in force
on the date hereof and will be outstanding and duly in force on the Closing
Date.

          (rr) Except as described in the Prospectus, there is (i) no action,
suit or proceeding before or by any court, arbitrator or governmental agency,
body or official, domestic or foreign, now pending or, to the knowledge of the
Plains Parties, threatened, to which any of the Plains Parties, or

                                      -18-
<PAGE>

any of their respective subsidiaries, is or may be a party or to which the
business or property of any of the Plains Parties, or any of their respective
subsidiaries, is or may be subject, (ii) no statute, rule, regulation or order
that has been enacted, adopted or issued by any governmental agency or that has
been proposed by any governmental body and (iii) no injunction, restraining
order or order of any nature issued by a federal or state court or foreign court
of competent jurisdiction to which any of the Plains Parties, or any of their
respective subsidiaries, is or may be subject, that, in the case of clauses (i),
(ii) and (iii) above, is reasonably expected to (A) singly or in the aggregate
have a material adverse effect on the condition (financial or other), business,
prospects, properties, net worth or results of operations of the Plains Parties,
taken as a whole, (B) prevent or result in the suspension of the offering and
issuance of the Units or (C) in any manner draw into question the validity of
this Agreement.

          (ss) The Common Units are listed on the New York Stock Exchange
("NYSE"), and the Units have been approved for listing on the NYSE subject only
to official notice of issuance.

     7.   Indemnification and Contribution.  (a)  Each of the Plains Parties,
jointly and severally, agrees to indemnify and hold harmless Underwriter, the
directors, officers, employees and agents of each Underwriter and each person,
if any, who controls any Underwriter within the meaning of Section 15 of the Act
or Section 20 of the Exchange Act from and against any and all losses, claims,
damages, liabilities and expenses (including reasonable costs of investigation)
arising out of or based upon any untrue statement or alleged untrue statement of
a material fact contained in any Prepricing Prospectus or in the Registration
Statement or the Prospectus or in any amendment or supplement thereto, or
arising out of or based upon any omission or alleged omission to state therein a
material fact required to be stated therein or necessary to make the statements
therein not misleading, except insofar as such losses, claims, damages,
liabilities or expenses arise out of or are based upon any untrue statement or
omission or alleged untrue statement or omission which has been made therein or
omitted therefrom in reliance upon and in conformity with the information
furnished in writing to the Partnership or the General Partner by or on behalf
of any Underwriter through you expressly for use in connection therewith;
provided, however, that the indemnification contained in this paragraph (a) with
respect to any Prepricing Prospectus shall not inure to the benefit of any
Underwriter (or to the benefit of any person controlling such Underwriter) on
account of any such loss, claim, damage, liability or expense arising from the
sale of the Units by such Underwriter to any person if a copy of the Prospectus
shall not have been delivered or sent to such person within the time required by
the Act and the regulations thereunder, and the untrue statement or alleged
untrue statement or omission or alleged omission of a material fact contained in
such Prepricing Prospectus was corrected in the Prospectus, provided that the
Partnership has delivered the Prospectus to the several Underwriters in
requisite quantity and on a timely basis to permit such delivery or sending.
The foregoing indemnity agreement shall be in addition to any liability which
any Plains Party may otherwise have.


          (b) If any action, suit or proceeding shall be brought against any
Underwriter, any director, officer, employee or agent of any Underwriter or any
person controlling any Underwriter

                                      -19-
<PAGE>

in respect of which indemnity may be sought against a Plains Party, such
Underwriter or such director, officer, employee, agent or controlling person
shall promptly notify the Partnership in writing, and the Partnership and the
General Partner shall assume the defense thereof, including the employment of
counsel and payment of all reasonable fees and expenses. The failure to notify
the indemnifying party shall not relieve it from liability which it may have to
an indemnified party unless the indemnifying party is foreclosed by reason of
such delay from asserting a defense otherwise available to it. Such Underwriter
or any such director, officer, employee, agent or controlling person shall have
the right to employ separate counsel in any such action, suit or proceeding and
to participate in (but not control) the defense thereof, but the fees and
expenses of such counsel shall be at the expense of such Underwriter or such
director, officer, employee, agent or controlling person unless (i) the
Partnership and General Partner has agreed in writing to pay such fees and
expenses, (ii) the Partnership and General Partner have failed to assume the
defense and employ counsel or (iii) the named parties to any such action, suit
or proceeding (including any impleaded parties) include both such Underwriter or
such director, officer, employee, agent or controlling person and the
Partnership or the General Partner, and such Underwriter or such director,
officer, employee, agent or controlling person shall have been advised by its
counsel that representation of such indemnified party and the Partnership or the
General Partner by the same counsel would be inappropriate under applicable
standards of professional conduct (whether or not such representation by the
same counsel has been proposed) due to actual or potential differing interests
between them (in which case the Partnership or the General Partner shall not
have the right to assume the defense of such action, suit or proceeding on
behalf of such Underwriter or such controlling person). It is understood,
however, that the Partnership or the General Partner shall, in connection with
any one such action, suit or proceeding or separate but substantially similar or
related actions, suits or proceedings in the same jurisdiction arising out of
the same general allegations or circumstances, be liable for the reasonable fees
and expenses of only one separate firm of attorneys (in addition to any local
counsel) at any time for all such Underwriters and directors, officers,
employees, agents and controlling persons not having actual or potential
differing interests with you or among themselves, which firm shall be designated
in writing by Salomon Smith Barney Inc., and that all such fees and expenses
shall be reimbursed as they are incurred. None of the Plains Parties shall be
liable for any settlement of any such action, suit or proceeding effected
without its written consent, but if settled with such written consent, or if
there be a final judgment for the plaintiff in any such action, suit or
proceeding, the Plains Parties agree, jointly and severally, to indemnify and
hold harmless any Underwriter, to the extent provided in the preceding
paragraph, and any such controlling person from and against any loss, claim,
damage, liability or expense by reason of such settlement or judgment.

          (c) Each Underwriter agrees, severally and not jointly, to indemnify
and hold harmless the Plains Parties, their respective directors and the
officers who sign the Registration Statement, and any person who controls the
Plains Parties within the meaning of Section 15 of the Act or Section 20 of the
Exchange Act, to the same extent as the foregoing indemnity from the Plains
Parties to each Underwriter, but only with respect to information furnished in
writing by or on behalf of such Underwriter through you expressly for use in the
Registration Statement, the Prospectus or any Prepricing Prospectus, or any
amendment or supplement thereto.  If any action,

                                      -20-
<PAGE>

suit or proceeding shall be brought against a Plains Party, any of such
directors and officers or any such controlling person based on the Registration
Statement, the Prospectus or any Prepricing Prospectus, or any amendment or
supplement thereto, and in respect of which indemnity may be sought against any
Underwriter pursuant to this paragraph (c), such Underwriter shall have the
rights and duties given to the Plains Parties by paragraph (b) above (except
that if the Partnership or the General Partner shall have assumed the defense
thereof such Underwriter shall not be required to do so, but may employ separate
counsel therein and participate in (but not control) the defense thereof, but
the fees and expenses of such counsel shall be at such Underwriter's expense),
and the Plains Parties, any of such directors and officers and any such
controlling person shall have the rights and duties given to the Underwriters by
paragraph (b) above. The foregoing indemnity agreement shall be in addition to
any liability which the Underwriters may otherwise have.

          (d) If the indemnification provided for in this Section 7 is
unavailable to an indemnified party under paragraph (a) or (c) hereof in respect
of any losses, claims, damages, liabilities or expenses referred to therein,
then an indemnifying party, in lieu of indemnifying such indemnified party,
shall contribute to the amount paid or payable by such indemnified party as a
result of such losses, claims, damages, liabilities or expenses (i) in such
proportion as is appropriate to reflect the relative benefits received by the
Plains Parties on the one hand and the Underwriters on the other hand from the
offering of the Units, or (ii) if the allocation provided by clause (i) above is
not permitted by applicable law, in such proportion as is appropriate to reflect
not only the relative benefits referred to in clause (i) above but also the
relative fault of the Plains Parties on the one hand and the Underwriters on the
other in connection with the statements or omissions that resulted in such
losses, claims, damages, liabilities or expenses, as well as any other relevant
equitable considerations.  The relative benefits received by the Partnership on
the one hand and the Underwriters on the other shall be deemed to be in the same
proportion as the total net proceeds from the offering (before deducting
expenses) received by the Partnership bear to the total underwriting discounts
and commissions received by the Underwriters, in each case as set forth in the
table on the cover page of the Prospectus.  The relative fault of the Plains
Parties on the one hand, and the Underwriters on the other hand shall be
determined by reference to, among other things, whether the untrue or alleged
untrue statement of a material fact or the omission or alleged omission to state
a material fact relates to information supplied by the Plains Parties or any
other affiliate of the Plains Parties on the one hand, or by the Underwriters on
the other hand, and the parties' relative intent, knowledge, access to
information and opportunity to correct or prevent such statement or omission.

          (e) The Plains Parties and the Underwriters agree that it would not be
just and equitable if contribution pursuant to this Section 7 were determined by
a pro rata allocation (even if the Underwriters were treated as one entity for
such purpose) or by any other method of allocation that does not take account of
the equitable considerations referred to in paragraph (d) above.  The amount
paid or payable by an indemnified party as a result of the losses, claims,
damages, liabilities and expenses referred to in paragraph (d) above shall be
deemed to include, subject to the limitations set forth above, any legal or
other expenses reasonably incurred by such indemnified party in connection with
investigating any claim or defending any such action, suit or proceeding.
Notwithstanding the provisions of this Section 7, no Underwriter shall be
required to contribute any

                                      -21-
<PAGE>

amount in excess of the amount by which the total price of the Units
underwritten by it and distributed to the public exceeds the amount of any
damages which such Underwriter has otherwise been required to pay by reason of
such untrue or alleged untrue statement or omission or alleged omission. No
person guilty of fraudulent misrepresentation (within the meaning of Section
11(f) of the Act) shall be entitled to contribution from any person who was not
guilty of such fraudulent misrepresentation. The Underwriters' obligations to
contribute pursuant to this Section 7 are several in proportion to the
respective numbers of Firm Units set forth opposite their names in Schedule I
hereto (or such numbers of Firm Units increased as set forth in Section 10
hereof) and not joint.

          (f) No indemnifying party shall, without the prior written consent of
the indemnified party, effect any settlement of any pending or threatened
action, suit or proceeding in respect of which any indemnified party is or could
have been a party and indemnity could have been sought hereunder by such
indemnified party, unless such settlement includes an unconditional release of
such indemnified party from all liability on claims that are the subject matter
of such action, suit or proceeding.

          (g) Any losses, claims, damages, liabilities or expenses for which an
indemnified party is entitled to indemnification or contribution under this
Section 7 shall be paid by the indemnifying party to the indemnified party as
such losses, claims, damages, liabilities or expenses are incurred.  The
indemnity and contribution agreements contained in this Section 7 and the
representations and warranties of the Plains Parties set forth in this Agreement
shall remain operative and in full force and effect, regardless of (i) any
investigation made by or on behalf of any Underwriter or any person controlling
any Underwriter, the Plains Parties or any of their respective directors or
officers or any person controlling the Plains Parties, (ii) acceptance of any
Units and payment therefor in accordance with the terms of this Agreement, and
(iii) any termination of this Agreement.  A successor to any Underwriter or any
person controlling any Underwriter, or to the Plains Parties or any of their
respective directors or officers or any person controlling a Plains Party shall
be entitled to the benefits of the indemnity, contribution and reimbursement
agreements contained in this Section 7.

                                      -22-
<PAGE>

     8.   Conditions of Underwriters' Obligations.  The several obligations of
the Underwriters to purchase the Firm Units hereunder are subject to the
following conditions:

          (a) If, at the time this Agreement is executed and delivered, it is
necessary for the registration statement or a post-effective amendment thereto
to be declared effective before the offering of the Units may commence, the
registration statement or such post-effective amendment shall have become
effective not later than 5:30 p.m., New York City time, on the date hereof, or
at such later date and time as shall be consented to in writing by Salomon Smith
Barney Inc., and all filings, if any, required by Rules 424 and 430A under the
Act shall be or have been timely made, as the case may be; no stop order
suspending the effectiveness of the registration statement shall have been
issued and no proceeding for that purpose shall have been instituted or, to the
knowledge of the Plains Parties or any Underwriter, threatened by the Commission
and any request of the Commission for additional information (to be included in
the Registration Statement or the Prospectus or otherwise) shall have been
complied with to your reasonable satisfaction.

          (b) Subsequent to the effective date of this Agreement, there shall
not have occurred (i) any change, or any development involving a prospective
change, in or affecting the condition (financial or other), business, prospects,
properties, net worth or results of operations of any of the Plains Parties not
contemplated by the Prospectus, which in your opinion, would materially
adversely affect the market for the Units, or (ii) any event or development
relating to or involving any of the Plains Parties or any executive officer or
director of any of such entities which makes any statement made in the
Prospectus untrue or which, in the opinion of the Partnership and its counsel or
the Underwriters and their counsel, requires the making of any addition to or
change in the Prospectus in order to state a material fact required by the Act
or any other law to be stated therein or necessary in order to make the
statements therein not misleading, if amending or supplementing the Prospectus
to reflect such event or development would, in your opinion, materially
adversely affect the market for the Units.

          (c) You shall have received on the Closing Date, an opinion of Andrews
& Kurth L.L.P., special counsel for the Plains Parties, dated the Closing Date
and addressed to you, to the effect that:

               (i) Each of the Partnership, Plains Marketing and Plains Scurlock
     has been duly formed and is validly existing in good standing as a limited
     partnership under the Delaware LP Act with all necessary partnership power
     and authority to own or lease its properties and conduct its business, in
     each case in all material respects as described in the Registration
     Statement and the Prospectus.

               (ii) Each of the Partnership, Plains Marketing and Plains
     Scurlock is duly registered or qualified as a foreign limited partnership
     for the transaction of business under the laws of the States set forth on
     Exhibit A to this opinion; and, to such counsel's knowledge, such
     jurisdictions are the only jurisdictions in which the character of the
     business conducted by the Partnership or the nature or location of the
     properties owned or leased by it make such registration or qualification
     necessary (except where the failure to so register

                                      -23-
<PAGE>

     or so qualify would not (A) have a material adverse effect on the condition
     (financial or other), business or results of operations of the Partnership
     and the Subsidiaries, taken as a whole, or (B) subject the limited partners
     of the Partnership to any material liability or disability).

               (iii) All American has been duly formed and is validly existing
     in good standing as a limited partnership under the Texas LP Act with all
     necessary partnership power and authority to own or lease its properties
     and conduct its business, in each case in all material respects as
     described in the Registration Statement and the Prospectus.

               (iv) All American is duly registered or qualified as a foreign
     limited partnership for the transaction of business under the laws of the
     States set forth on Exhibit A to this opinion; and, to such counsel's
     knowledge, such jurisdictions are the only jurisdictions in which the
     character of the business conducted by All American or the nature or
     location of the properties owned or leased by it make such registration or
     qualification necessary (except where the failure to so register or so
     qualify would not (A) have a material adverse effect on the condition
     (financial or other), business or results of operations of the Partnership
     and the Subsidiaries, taken as a whole, or (B) subject the limited partners
     of the Partnership to any material liability or disability.

               (v) The General Partner has been duly incorporated and is validly
     existing in good standing under the laws of the State of Delaware, with all
     necessary corporate power and authority to own or lease its properties,
     conduct its business and act as general partner of the Partnership and the
     Operating Partnerships, in each case in all material respects as described
     in the Registration Statement and the Prospectus.

               (vi) The General Partner is duly registered or qualified as a
     foreign corporation for the transaction of business under the laws of the
     States set forth on Exhibit A to this opinion; and to such counsel's
     knowledge, such jurisdictions are the only jurisdictions in which the
     character of the business conducted by the General Partner or the nature or
     location of the properties owned or leased by it make such registration or
     qualification necessary (except where the failure to so register or so
     qualify would not (A) have a material adverse effect on the condition
     (financial or other), business or results of operations of the Partnership
     and the Subsidiaries, taken as a whole, or the General Partner or (B)
     subject the limited partners of the Partnership to any material liability
     or disability).

               (vii) PAAI LLC has been duly formed and is validly existing in
     good standing as a limited liability company under the Delaware LLC Act,
     with all necessary limited liability company power and authority to own or
     lease its properties and conduct its business, in each case in all material
     respect as described in the Registration Statement and the Prospectus.

               (viii)  PAAI LLC is duly registered or qualified as a foreign
     limited

                                      -24-
<PAGE>

     liability company for the transaction of business under the laws of the
     State of Texas; and to such counsel's knowledge, such jurisdiction is the
     only jurisdiction in which the character of the business conducted by PAAI
     LLC or the nature or location of the properties owned or leased by it makes
     such registration or qualification necessary (except where the failure to
     so register or so qualify would not (A) have a material adverse effect on
     the condition (financial or other), business or results of operations of
     the Partnership and the Subsidiaries, taken as a whole, or PAAI LLC or (B)
     subject the limited partners of the Partnership to any material liability
     or disability).

               (ix) Each of Scurlock Permian and Scurlock Permian Pipeline has
     been duly formed and is validly existing in good standing as a limited
     liability company under the Delaware LLC Act, with all necessary limited
     liability company power and authority to own or lease its properties and
     conduct its business as currently conducted.

               (x) Each of Scurlock Permian and Scurlock Permian Pipe Line is
     duly registered or qualified as a foreign limited liability company for the
     transaction of business under the laws of the States set forth on Exhibit A
     to this opinion; and to such counsel's knowledge, such jurisdictions are
     the only jurisdictions in which the character of the business conducted by
     Scurlock Permian and Scurlock Permian Pipe Line or the nature or location
     of the properties owned or leased by them makes such registration or
     qualification necessary (except where the failure to so register or so
     qualify would not (A) have a material adverse effect on the condition
     (financial or other), business  or results of operations of the Partnership
     and the Subsidiaries, taken as a whole, or (B) subject the limited partners
     of the Partnership to any material liability or disability).

               (xi) The General Partner is the sole general partner of the
     Partnership, with a 1% general partner interest in the Partnership; such
     general partner interest has been duly authorized and validly issued in
     accordance with the Partnership Agreement; the General Partner owns all of
     the Incentive Distribution Rights and all of the Class B Units; such
     Incentive Distribution Rights and Class B Units have been duly authorized
     and validly issued in accordance with the Partnership Agreement and are
     fully paid (to the extent required under the Partnership Agreement) and
     nonassessable (except as such nonassessability may be affected by matters
     described in the Prospectus under the caption "The Partnership Agreement--
     Limited Liability"); and the General Partner owns such general partner
     interest, Incentive Distribution Rights and Class B Units free and clear of
     all liens, encumbrances, security interests, charges or claims (A) in
     respect of which a financing statement under the Uniform Commercial Code of
     the State of Delaware naming the General Partner as debtor is on file in
     the office of the Secretary of State of the State of Delaware or (B)
     otherwise known to such counsel, without independent investigation, other
     than those created by or arising under the Delaware LP Act.

               (xii) The Sponsor Units and the limited partner interests
     represented thereby have been duly authorized and validly issued in
     accordance with the Partnership

                                      -25-
<PAGE>

     Agreement and are fully paid (to the extent required under the Partnership
     Agreement) and nonassessable (except as such nonassessability may be
     affected by matters described in the Prospectus under "The Partnership
     Agreement--Limited Liability"); PAAI LLC owns 6,974,239 Common Units and
     10,029,619 Subordinated Units free and clear of all liens, encumbrances,
     security interests, charges or claims (A) in respect of which a financing
     statement under the Uniform Commercial Code of the State of Delaware naming
     PAAI LLC as debtor is on file in the office of the Secretary of State of
     the State of Delaware or (B) otherwise known to such counsel, without
     independent investigation, other than those created by or arising under the
     Delaware LP Act.

               (xiii) The 2,600,000 Common Units to be issued and sold to the
     Underwriters by the Partnership pursuant to this Agreement and the limited
     partner interests represented thereby have been duly authorized by the
     Partnership Agreement and, when issued and delivered against payment
     therefor as provided in this Agreement, will be validly issued, fully paid
     (to the extent required under the Partnership Agreement) and nonassessable
     (except as such nonassessability may be affected by matters described in
     the Prospectus under the caption "The Partnership Agreement--Limited
     Liability"); other than the Sponsor Units owned by PAAI LLC and the
     Incentive Distribution Rights and Class B Units owned by the General
     Partner, the Units will be the only limited partner interests of the
     Partnership issued and outstanding at the Closing Date.

               (xiv)  The General Partner is the sole general partner of Plains
     Marketing with a 1.0101% general partner interest in Plains Marketing; such
     general partner interest has been duly authorized and validly issued in
     accordance with the Plains Marketing Partnership Agreement; and the General
     Partner owns such general partner interest free and clear of all liens,
     encumbrances, security interests, charges or claims (A) in respect of which
     a financing statement under the Uniform Commercial Code of the State of
     Delaware naming the General Partner as debtor is on file in the office of
     the Secretary of State of the State of Delaware or (B) otherwise known to
     such counsel, without independent investigation, other than those created
     by or arising under the Delaware LP Act.

               (xv)  The General Partner is the sole general partner of All
     American with a .001% general partner interest in All American; such
     general partner interest has been duly authorized and validly issued in
     accordance with the All American Partnership Agreement; and the General
     Partner owns such general partner interest free and clear of all liens,
     encumbrances, security interests, charges or claims (A) in respect of which
     a financing statement under the Uniform Commercial Code of the State of
     Delaware naming the General Partner as debtor is on file in the office of
     the Secretary of State of the State of Delaware or (B) otherwise known to
     such counsel, without independent investigation, other than those created
     by or arising under the Texas LP Act.

               (xvi)  The General Partner is the sole general partner of Plains
     Scurlock with a .001% general partner interest in Plains Scurlock; such
     general partner interest has

                                      -26-
<PAGE>

     been duly authorized and validly issued in accordance with the Plains
     Scurlock Partnership Agreement; and the General Partner owns such general
     partner interest free and clear of all liens, encumbrances, security
     interests, charges or claims (A) in respect of which a financing statement
     under the Uniform Commercial Code of the State of Delaware naming the
     General Partner as debtor is on file in the office of the Secretary of
     State of the State of Delaware or (B) otherwise known to such counsel,
     without independent investigation, other than those created by or arising
     under the Delaware LP Act.

               (xvii)  The Partnership is the sole limited partner of Plains
     Marketing with a 98.9899% limited partner interest in Plains Marketing;
     such limited partner interest has been duly authorized and validly issued
     in accordance with the Plains Marketing Partnership Agreement and is fully
     paid (to the extent required under the Plains Marketing Partnership
     Agreement) and nonassessable (except as such nonassessability may be
     affected by matters described in the Prospectus under the caption "The
     Partnership Agreement--Limited Liability"); and the Partnership owns such
     limited partner interest free and clear of all liens, encumbrances,
     security interests, charges or claims (A) in respect of which a financing
     statement under the Uniform Commercial Code of the State of Delaware naming
     the Partnership as debtor is on file in the office of the Secretary of
     State of the State of Delaware, (B) otherwise known to such counsel,
     without independent investigation, other than those created by or arising
     under the Delaware LP Act, or (C) except as provided in the Plains Bank
     Credit Agreement and the Plains Letter of Credit Facility.

               (xviii) Plains Marketing is the sole limited partner of All
     American with a 99.999% limited partner interest in All American; such
     limited partner interest has been duly authorized and validly issued in
     accordance with the All American Partnership Agreement and is fully paid
     (to the extent required under the All American Partnership Agreement) and
     nonassessable (except as such nonassessability may be affected by Section
     6.07 of the Texas LP Act); and Plains Marketing owns such limited partner
     interest free and clear of all liens, encumbrances, security interests,
     charge or claims (A) in respect of which a financing statement under the
     Uniform Commercial Code of the States of Delaware or Texas naming Plains
     Marketing as debtor is on file in the office of the Secretary of State of
     the States of Delaware or Texas, (B) otherwise known to such counsel,
     without independent investigation, other than those created by or arising
     under the Texas LP Act, or (C) except as provided in the Plains Bank Credit
     Agreement and the Plains Letter of Credit Facility.

               (xix)  Plains Marketing is the sole limited partner of Plains
     Scurlock with a 99.999% limited partner interest in Plains Scurlock; such
     limited partner interest has been duly authorized and validly issued in
     accordance with the Plains Scurlock Partnership Agreement and is fully paid
     (to the extent required under the Plains Scurlock Partnership Agreement)
     and nonassessable (except as such nonassessability may be affected by
     matters described in the Prospectus under the caption "The Partnership
     Agreement--Limited Liability"); and Plains Marketing owns such limited
     partner interest free and clear of all

                                      -27-
<PAGE>

     liens, encumbrances, security interests, charge or claims (A) in respect of
     which a financing statement under the Uniform Commercial Code of the States
     of Delaware or Texas naming Plains Marketing as debtor is on file in the
     office of the Secretary of State of the States of Delaware or Texas, (B)
     otherwise known to such counsel, without independent investigation, other
     than those created by or arising under the Delaware LP Act, or (C) except
     as provided in the Plains Scurlock Bank Credit Agreement.

               (xx) Plains Resources owns 100% of the issued and outstanding
     capital stock of the General Partner; such capital stock has been duly
     authorized and validly issued and is fully paid and nonassessable; and
     Plains Resources owns such capital stock free and clear of all liens,
     encumbrances, security interests, charges or claims (A) in respect of which
     a financing statement under the Uniform Commercial Code of the State of
     Delaware naming Plains Resources as debtor is on file in the office of the
     Secretary of State of the State of Delaware or (B) otherwise known to such
     counsel, without independent investigation, other than those created by or
     arising under the Delaware General Corporation Law (the "DGCL").

               (xxi) The General Partner owns a 100% member interest in PAAI
     LLC; such member interest has been duly authorized and validly issued in
     accordance with the PAAI LLC Agreement and is fully paid (to the extent
     required under the PAAI LLC Agreement) and nonassessable (except as such
     nonassessability may be affected by Section 18-607 of the Delaware LLC
     Act); the General Partner owns such member interest free and clear of all
     liens, encumbrances, security interests, charges or claims (A) in respect
     of which a financing statement under the Uniform Commercial Code of the
     State of Delaware naming the General Partner as debtor is on file in the
     office of the Secretary of State of the State of Delaware or (B) otherwise
     known to such counsel, without independent investigation, other than those
     created by or arising under the Delaware LLC Act.

               (xxii) Plains Scurlock owns a 100% member interest in Scurlock
     Permian; such member interest has been duly authorized and validly issued
     in accordance with the Scurlock Permian LLC Agreement and is fully paid (to
     the extent required under the Scurlock Permian LLC Agreement) and
     nonassessable (except as such nonassessability may be affected by Section
     18-607 of the Delaware LLC Act); Plains Scurlock owns such member interest
     free and clear of all liens, encumbrances, security interests, charges or
     claims (A) in respect of which a financing statement under the Uniform
     Commercial Code of the State of Delaware naming Plains Scurlock as debtor
     is on file in the office of the Secretary of State of the State of Delaware
     or (B) otherwise known to such counsel, without independent investigation,
     other than those created by or arising under the Delaware LLC Act.

               (xxiii) Scurlock Permian owns a 100% member interest in Scurlock
     Permian Pipe Line; such member interest has been duly authorized and
     validly issued in accordance with the Scurlock Permian Pipe Line LLC
     Agreement and is fully paid (to the extent required under the Scurlock
     Permian Pipe Line LLC Agreement) and nonassessable

                                      -28-
<PAGE>

     (except as such nonassessability may be affected by Section 18-607 of the
     Delaware LLC Act); Scurlock Permian owns such member interest free and
     clear of all liens, encumbrances, security interests, charges or claims (A)
     in respect of which a financing statement under the Uniform Commercial Code
     of the State of Delaware naming Scurlock Permian as debtor is on file in
     the office of the Secretary of State of the State of Delaware or (B)
     otherwise known to such counsel, without independent investigation, other
     than those created by or arising under the Delaware LLC Act.

               (xxiv)  Except as described in the Prospectus, there are no
     preemptive rights or other rights to subscribe for or to purchase, nor any
     restriction upon the voting or transfer of, any interests in the
     Partnership or any Subsidiary pursuant to any of the Organization
     Agreements or any other agreement or instrument known to such counsel to
     which the Partnership or any Subsidiary is a party or by which any one of
     them may be bound.  To such counsel's knowledge, neither the filing of the
     Registration Statement nor the offering or sale of the Units as
     contemplated by this Agreement gives rise to any rights for or relating to
     the registration of any Units or other securities of the Partnership or any
     Subsidiary.  To such counsel's knowledge, except as described in the
     Prospectus, there are no outstanding options or warrants to purchase any
     Common Units or Subordinated Units or other partnership interests in the
     Partnership or any Subsidiary.  The Partnership has all requisite power and
     authority to issue, sell and deliver the Units, in accordance with and upon
     the terms and conditions set forth in this Agreement, the Partnership
     Agreement and the Registration Statement and Prospectus.

               (xxv) This Agreement has been duly authorized and validly
     executed and delivered by each of the Plains Parties.

               (xxvi) The Partnership Agreement has been duly authorized,
     executed and delivered by the General Partner and is a valid and legally
     binding agreement of the General Partner, enforceable against the General
     Partner in accordance with its terms; the Plains Marketing Partnership
     Agreement has been duly authorized, executed and delivered by each of the
     General Partner and the Partnership, and is a valid and legally binding
     agreement of the General Partner and the Partnership, enforceable against
     each of them in accordance with its terms; the All American Partnership
     Agreement has been duly authorized, executed and delivered by each of the
     General Partner and Plains Marketing and is a valid and legally binding
     agreement of the General Partner and Plains Marketing enforceable against
     each of them in accordance with its terms; the Plains Scurlock Partnership
     Agreement has been duly authorized, executed and delivered by each of the
     General Partner and Plains Marketing and is a valid and legally binding
     agreement of the General Partner and Plains Marketing enforceable against
     each of them in accordance with its terms; the Scurlock Permian LLC
     Agreement has been duly authorized, executed and delivered by Plains
     Scurlock and is a valid and legally binding agreement of Plains Scurlock
     enforceable against it in accordance with its terms; the Scurlock Permian
     Pipe Line LLC Agreement has been duly authorized, executed and delivered by
     Scurlock Permian and is a valid and legally binding agreement of

                                      -29-
<PAGE>

     Scurlock Permian enforceable against it in accordance with its terms;
     provided that, with respect to each such agreement, the enforceability
     thereof may be limited by (A) applicable bankruptcy, insolvency, fraudulent
     transfer, reorganization, moratorium or similar laws from time to time in
     effect affecting creditors' rights and remedies generally and by general
     principles of equity (regardless of whether such principles are considered
     in a proceeding in equity or at law) and (B) public policy, applicable law
     relating to fiduciary duties and indemnification and an implied covenant of
     good faith and fair dealing.

               (xxvii) None of the offering, issuance and sale by the
     Partnership of the Units, the execution, delivery and performance of this
     Agreement by the Plains Parties or the consummation of the transactions
     contemplated hereby (A) constitutes or will constitute a violation of the
     Organizational Agreements or the certificate or articles of incorporation
     or bylaws or other organizational documents of any of the Plains Parties,
     (B) constitutes or will constitute a breach or violation of, or a default
     under (or an event which, with notice or lapse of time or both, would
     constitute such an event), any agreement filed or incorporated by reference
     as an exhibit to the Registration Statement (other than the Plains Bank
     Credit Agreement, the Plains Letter of Credit Facility and the Plains
     Scurlock Bank Credit Agreement), (C) results or will result in any
     violation of the Delaware LP Act, the Delaware LLC Act, the DGCL, the laws
     of the State of Texas or federal law, or (D) results or will result in the
     creation or imposition of any lien, charge or encumbrance upon any property
     or assets of any of the Plains Parties, which in the case of clauses (B),
     (C) or (D) would reasonably be expected to have a material adverse effect
     on the financial condition, business or results of operations of the
     Partnership and the Subsidiaries, taken as a whole, or the General Partner.

               (xxviii)  No permit, consent, approval, authorization, order,
     registration, filing or qualification of or with any federal, Delaware, or
     Texas court, governmental agency or body having jurisdiction over the
     Plains Parties or any of their respective properties is required for the
     offering, issuance and sale by the Partnership of the Units, the execution,
     delivery and performance of this Agreement or the consummation of the
     transactions contemplated by this Agreement, except as may be required
     under state securities or "Blue Sky" laws, as to which such counsel need
     not express any opinion.

               (xxix) The statements in the Registration Statement and
     Prospectus under the captions "Cash Distribution Policy," "Business--
     Regulation," "Business-- Environmental Regulation," "Certain Relationships
     and Related Transactions," "Conflicts of Interest and Fiduciary
     Responsibilities," "Description of the Common Units" and "The Partnership
     Agreement," insofar as they constitute descriptions of agreements or refer
     to statements of law or legal conclusions, are accurate and complete in all
     material respects, and the Units, the Common Units, the Subordinated Units,
     the Class B Units and the Incentive Distribution Rights conform in all
     material respects to the descriptions thereof contained in the Registration
     Statement and Prospectus under the captions "Prospectus Summary--The
     Offering," "Cash Distribution Policy," "Description of the Common Units,"
     "Description of the Subordinated Units" and "The Partnership Agreement."

                                      -30-
<PAGE>

               (xxx)  The opinion of Andrews & Kurth L.L.P. that is filed as
     Exhibit 8.1 to the Registration Statement is confirmed and the Underwriters
     may rely upon such opinion as if it were addressed to them.

               (xxxi) The Registration Statement was declared effective under
     the Act on September ___, 1999; to the knowledge of such counsel, no stop
     order suspending the effectiveness of the Registration Statement has been
     issued and no proceedings for that purpose have been instituted or
     threatened by the Commission; and any required filing of the Prospectus
     pursuant to Rule 424(b) has been made in the manner and within the time
     period required by such Rule.

               (xxxii) The Registration Statement and the Prospectus (except for
     the financial statements and the notes and the schedules thereto and the
     other financial, statistical and accounting data included in the
     Registration Statement or the Prospectus, as to which such counsel need not
     express any opinion) comply as to form in all material respects with the
     requirements of the Act and the rules and regulations promulgated
     thereunder.

               (xxxiii) To the knowledge of such counsel, (A) there is no legal
     or governmental proceeding pending or threatened to which any of the Plains
     Parties is a party or to which any of their respective properties is
     subject that is required to be disclosed in the Prospectus and is not so
     disclosed and (B) there are no agreements, contracts or other documents to
     which any of the Plains Parties is a party that are required to be
     described in the Registration Statement or the Prospectus or to be filed as
     exhibits to the Registration Statement that are not described or filed as
     required.

               (xxxiv)  None of the Plains Parties is an "investment company" as
     such term is defined in the Investment Company Act of 1940, as amended.

               (xxxv) Upon delivery to the Underwriters of certificates
     evidencing the Units issued in the name of the Underwriters and payment by
     the Underwriters of the purchase price for the Units, the Underwriters will
     acquire the Units free of any adverse claim (as such term is defined in
     Section 8-302 of the New York Uniform Commercial Code), assuming that the
     Underwriters are acting in good faith and without notice of any adverse
     claim.

          In addition, such counsel shall state that they have participated in
conferences with officers and other representatives of the Plains Parties and
the independent public accountants of the Partnership and your representatives,
at which the contents of the Registration Statement and the Prospectus and
related matters were discussed, and although such counsel has not independently
verified, is not passing on, and is not assuming any responsibility for the
accuracy, completeness or fairness of the statements contained in, the
Registration Statement and the Prospectus (except to the

                                      -31-
<PAGE>

extent specified in the foregoing opinion), no facts have come to such counsel's
attention that lead such counsel to believe that the Registration Statement
(other than (i) the financial statements included therein, including the notes
and schedules thereto and the auditors' reports thereon, (ii) the other
historical, pro forma and projected financial information and the statistical
and accounting information included therein and (iii) the exhibits thereto, as
to which such counsel need not comment), as of its effective date contained an
untrue statement of a material fact or omitted to state a material fact required
to be stated therein or necessary to make the statements therein not misleading,
or that the Prospectus (other than (i) the financial statements included
therein, including the notes and schedules thereto and the auditors' reports
thereon and (ii) the other historical, pro forma and projected financial
information and the statistical and accounting information included therein, as
to which such counsel need not comment), as of its issue date and the Closing
Date contained an untrue statement of a material fact or omitted to state a
material fact necessary to make the statements therein, in the light of the
circumstances under which they were made, not misleading.

          In rendering such opinion, such counsel may (A) rely in respect of
matters of fact upon certificates of officers and employees of the Plains
Parties and upon information obtained from public officials, (B) assume that all
documents submitted to them as originals are authentic, that all copies
submitted to them conform to the originals thereof, and that the signatures on
all documents examined by them are genuine, (C) state that their opinion is
limited to federal laws, the Delaware LP Act, the Delaware LLC Act, the DGCL and
the laws of the States of New York and Texas, (D) with respect to the opinions
expressed in paragraphs (ii), (iv), (vi), (viii) and (x) above as to the due
qualification or registration as a foreign limited partnership, corporation or
limited liability company, as the case may be, of each of the Plains Parties,
state that such opinions are based upon the opinions of Goodin, MacBride,
Squeri, Scholtz & Ritchie, LLP, ________________, _______________ and
__________________ provided pursuant to (f) below and upon certificates of
foreign qualification or registration provided by the Secretary of State of the
States of Alabama, Arizona, Arkansas, California, Colorado, Florida, Illinois,
Indiana, Kansas, Kentucky, Louisiana, Minnesota, Mississippi, Missouri, Montana,
Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas, Utah and
Wyoming (each of which shall be dated as of a date not more than fourteen days
prior to the Closing Date and shall be provided to you) and (E)  state that they
express no opinion with respect to state or local taxes or tax statutes to which
any of the limited partners of the Partnership or any of the Plains Parties may
be subject.

          (d) You shall have received on the Closing Date, an opinion of
Fulbright & Jaworski LLP, special counsel for Plains Resources, dated the
Closing Date and addressed to you, to the effect that:

               (i) None of the offering, issuance or sale by the Partnership of
     the Units, the execution and delivery of this Agreement by the Plains
     Parties or the consummation of the transactions contemplated hereby result
     in a breach of, or constitutes a default under (or an event which, with
     notice or lapse of time or both, would constitute such an event) the
     provisions of any of any credit agreement, note agreement, indenture,
     promissory note or other agreement evidencing or governing indebtedness of
     any of the

                                      -32-
<PAGE>

     Plains Parties, which would reasonably be expected to have a material
     adverse effect on the financial condition, business or results of
     operations of the Partnership and the Subsidiaries, taken as a whole, or
     the General Partner.

               (ii) The statements in the Registration Statement and Prospectus
     under the caption "Management's Discussion and Analysis of Financial
     Condition and Results of Operations--The Partnership--Capital Resources,
     Liquidity and Financial Condition--Credit Agreements," insofar as they
     constitute descriptions of agreements, are accurate and complete in all
     material respects.

          In rendering such opinion, such counsel may (A) rely in respect of
matters of fact upon certificates of officers and employees of the Plains
Parties and upon information obtained from public officials, (B) assume that all
documents submitted to them as originals are authentic, that all copies
submitted to them conform to the originals thereof, and that the signatures on
all documents examined by them are genuine and (C) state that such opinions are
limited to federal laws and the laws of the states of Delaware, New York and
Texas, excepting therefrom municipal and local ordinances and regulations.

          In rendering such opinion, such counsel shall state that such opinion
letter may be relied upon only by the Underwriters and its counsel in connection
with the transactions contemplated by this Agreement and no other use or
distribution of this opinion letter may be made without such counsel's prior
written consent.

          (e) You shall have received on the Closing Date an opinion of Michael
R. Patterson, general counsel for Plains Resources, dated the Closing Date and
addressed to you, to the effect that:

               (i) Plains Resources has been duly incorporated and is validly
     existing in good standing under the laws of the State of Delaware, with all
     necessary corporate power and authority to own or lease its properties and
     conduct its business, in each case and all material respects as described
     in the Registration Statement and the Prospectus.

               (ii) To the knowledge of such counsel, none of the Plains Parties
     is in (A) breach or violation of the provisions of its Organizational
     Agreement, certificate or articles of incorporation or bylaws or other
     organizational documents or (B) default (and no event has occurred which,
     with notice or lapse of time or both, would constitute such a default) or
     violation in the performance of any obligation, agreement or condition
     contained in any bond, debenture, note or any other evidence of
     indebtedness or in any agreement, indenture, lease or other instrument to
     which it is a party or by which it or any of its properties may be bound,
     which breach, default or violation would, if continued, have a material
     adverse effect on the financial condition, business or results of
     operations of the Plains Parties, taken as a whole, or could materially
     impair the ability of any of the Plains Parties to perform their
     obligations under this Agreement.

                                      -33-
<PAGE>

               (iii)  None of the offering, issuance and sale by the Partnership
     of the Units, the execution, delivery and performance by the Plains Parties
     of this Agreement or the consummation of the transactions contemplated
     hereby constitutes or will constitute a breach or violation of, or a
     default under (or an event which, with notice or lapse of time or both,
     would constitute such an event) any bond, debenture, note or any other
     evidence of indebtedness, indenture or any other material agreement or
     instrument known to such counsel to which a Plains Party is a party or by
     which any one of them may be bound (other than any other agreement filed or
     incorporated by reference as an exhibit to the Registration Statement or
     any credit agreement, note agreement, indenture, promissory note or other
     agreement evidencing or governing indebtedness of any of the Plains
     Parties) which would reasonably be expected to have a material adverse
     effect on the financial condition, business or results of operations of the
     Partnership and the Subsidiaries, taken as a whole, or the General Partner.

               (iv) To the knowledge of such counsel, each of the Plains Parties
     has such permits, consents, licenses, franchises and authorizations
     ("permits") issued by the appropriate federal, state or local governmental
     or regulatory authorities as are necessary to own or lease its properties
     and to conduct its business in the manner described in the Prospectus,
     subject to such qualifications as may be set forth in the Prospectus, and
     except for such permits which, if not obtained would not reasonably be
     expected to have, individually or in the aggregate, a material adverse
     effect upon the operations conducted by the Partnership and the
     Subsidiaries, taken as a whole; and, to the knowledge of such counsel, none
     of the Plains Parties has received any notice of proceedings relating to
     the revocation or modification of any such permits which, individually or
     in the aggregate, if the subject of an unfavorable decision, ruling or
     finding, would reasonably be expected to have a material adverse effect
     upon the operations conducted by the Partnership and the Subsidiaries,
     taken as a whole.

               (v) Except as described in the Prospectus, to the knowledge of
     such counsel, there is no litigation proceeding, or governmental
     investigation pending or threatened against any of the Plains Parties
     which, if adversely determined to such Plains Parties, is reasonably likely
     to have a material adverse effect on the financial condition, business,
     property, or results of operations of the Plains Parties, taken as a whole.

          In addition, such counsel shall state that he has participated in
conferences with officers and other representatives of the Plains Parties and
the independent public accountants of the Partnership and your representatives,
at which the contents of the Registration Statement and the Prospectus and
related matters were discussed, and although such counsel has not independently
verified, is not passing on, and is not assuming any responsibility for the
accuracy, completeness or fairness of the statements contained in, the
Registration Statement and the Prospectus, no facts have come to such counsel's
attention that lead such counsel to believe that the Registration Statement
(other than (i) the financial statements included therein, including the notes
and schedules thereto and the auditors' reports thereon, (ii) the other
historical, pro forma and projected financial

                                      -34-
<PAGE>

information and the statistical and accounting information included therein, and
(iii) the exhibits thereto, as to which such counsel need not comment), as of
its effective date contained an untrue statement of a material fact or omitted
to state a material fact required to be stated therein or necessary to make the
statements therein not misleading, or that the Prospectus (other than (i) the
financial statements included therein, including the notes and schedules thereto
and the auditors' reports thereon and (ii) the other historical, pro forma and
projected financial information and the statistical and accounting information
included therein, as to which such counsel need not comment), as of its issue
date and the Closing Date contained an untrue statement of a material fact or
omitted to state a material fact necessary to make the statements therein, in
the light of the circumstances under which they were made, not misleading.

          In rendering such opinion, such counsel may (A) rely in respect of
matters of fact upon certificates of officers and employees of the Plains
Parties and upon information obtained from public officials, (B) assume that all
documents submitted to him as originals are authentic, that all copies submitted
to him conform to the originals thereof, and that the signatures on all
documents examined by him are genuine, (C) state that such opinions are limited
to federal laws and the Delaware LP Act, the Delaware LLC Act and the DGCL and
the laws of the State of Texas and (D) state that he expresses no opinion with
respect to state or local taxes or tax statutes.

          (f) You shall have received on the Closing Date, an opinion of each of
(i)  Goodin, MacBride, Squeri, Scholtz & Ritchie, LLP, with respect to the State
of California, (ii)  ___________________ with respect to the State of Illinois,
(iii) ____________________ with respect to the State of Louisiana and (iv)
__________________ with respect to the State of Mississippi, each of which is
acting as special local counsel for the Plains Parties, dated the Closing Date
and addressed to you, to the effect that:

               (i) Each of the Plains Parties has been duly qualified or
     registered as a foreign corporation, a foreign limited liability company or
     a foreign limited partnership, as the case may be, for the transaction of
     business under the laws of [insert applicable state].

               (ii) Each Operating Partnership has all requisite power and
     authority as a limited partnership under the laws of the State of [insert
     applicable state] to own or lease its properties and to conduct its
     business in the State of [insert applicable state]; and (assuming that the
     Partnership is not liable under the laws of the States of Delaware or Texas
     for the liabilities of the Operating Partnerships and that the Unitholders
     are not liable under the laws of the States of Delaware or Texas for
     liabilities of the Partnership or the Operating Partnerships), the
     Partnership is not liable under the laws of the State of [insert applicable
     state] for the liabilities of the Operating Partnerships, and the
     Unitholders are not liable under the laws of the State of [insert
     applicable state] for the liabilities of the Partnership or the Operating
     Partnerships, except in each case to the same extent as under the laws of
     the States of Delaware or Texas.

               (iii) No permit, consent, approval, authorization, order,
     registration,

                                      -35-
<PAGE>

     filing or qualification of or with any court, governmental agency or body
     of the State of [insert applicable state] having jurisdiction over the
     Plains Parties or any of their respective properties is required for the
     offering, issuance and sale by the Partnership of the Units except as may
     be required under state securities or "Blue Sky" laws, as to which such
     counsel need not express any opinion.

               (iv) The Subsidiaries are entitled to exercise the power of
     eminent domain to secure rights-of-way necessary to operate their pipeline
     assets in the State of [insert applicable state].

     In rendering such opinion, such counsel may (A) rely in respect of matters
of fact upon certificates of officers and employees of the Plains Parties and
upon information obtained from public officials, (B) assume that all documents
submitted to them as originals are authentic, that all copies submitted to them
conform to the originals thereof, and that the signatures on all documents
examined by them are genuine, (C) state that such opinions are limited to
federal laws and the laws of the State of [insert applicable state], excepting
therefrom municipal and local ordinances and regulations and (D) state that they
express no opinion with respect to state or local taxes or tax statutes to which
any of the limited partners of the Partnership or any of the Plains Parties may
be subject.

     In rendering such opinion, such counsel shall state that (A) Andrews &
Kurth L.L.P. is hereby authorized to rely upon such opinion letter in connection
with the transactions contemplated by this Agreement as if such opinion letter
were addressed and delivered to them on the date hereof and (B) subject to the
foregoing, such opinion letter may be relied upon only by the Underwriters and
its counsel in connection with the transactions contemplated by this Agreement
and no other use or distribution of this opinion letter may be made without such
counsel's prior written consent.

          (g) You shall have received on the Closing Date an opinion of Baker &
Botts, L.L.P., counsel for the Underwriters, dated the Closing Date and
addressed to you, with respect to the issuance and sale of the Units, the
Registration Statement and the Prospectus (together with any supplement or
amendment thereto) and other related matters as the Underwriters may reasonably
require.

          (h) You shall have received letters addressed to you, and dated the
date hereof and the Closing Date from PricewaterhouseCoopers LLP, independent
public accountants, substantially in the forms heretofore approved by you and
agreed to by PricewaterhouseCoopers LLP.

          (i) (i) No stop order suspending the effectiveness of the Registration
Statement shall have been issued and no proceedings for that purpose shall have
been instituted or taken or, to the knowledge of the Partnership and the General
Partner, shall be threatened by the Commission at or prior to the Closing Date;
(ii) there shall not have been any change in the partners' capital or
stockholder's equity of the Partnership, the Operating Partnerships or the
General Partner, as the case

                                      -36-
<PAGE>

may be, nor any material increase in the short-term or the long-term debt of the
Partnership, the Operating Partnerships or the General Partner (other than in
the ordinary course of business) from that set forth or contemplated in the
Registration Statement or the Prospectus (or any amendment or supplement
thereto); (iii) there shall not have been, since the respective dates as of
which information is given in the Registration Statement and the Prospectus (or
any amendment or supplement thereto), except as may otherwise be stated in the
Registration Statement and the Prospectus (or any amendment or supplement
thereto), any material adverse change in or affecting the condition (financial
or other), business, prospects, properties, net worth or results of operations
of the Partnership and the Subsidiaries, taken as a whole; (iv) the Partnership
and the Subsidiaries shall not have any liabilities or obligations, direct or
contingent (whether or not in the ordinary course of business), that are
material to the Partnership and the Subsidiaries taken as a whole other than
those reflected in the Registration Statement or the Prospectus (or any
amendment or supplement thereto); and (v) all the representations and warranties
of the Plains Parties contained in this Agreement shall be true and correct on
and as of the date hereof and on and as of the Closing Date as if made on and as
of the Closing Date.

          (j) The Plains Parties shall not have failed at or prior to the
Closing Date to have performed or complied in all material respects with any of
their agreements herein contained and required to be performed or complied with
by them hereunder at or prior to the Closing Date.

          (k) The NYSE shall have approved the Units for listing, subject only
to official notice of issuance and evidence of satisfactory distribution.

          (l) The Plains Parties shall have furnished or caused to be furnished
to you such further certificates and documents as you shall have reasonably
requested.

          (m) There shall have been furnished to you at the Closing Date a
certificate reasonably satisfactory to you, signed on behalf of the Partnership
by the President or any Vice President and the Chief Financial Officer of the
General Partner to the effect that:  (A) the representations and warranties of
each Plains Party contained in this Agreement are true and correct at and as of
the Closing Date as though made at and as of the Closing Date; (B) each of the
Plains Parties has in all material respects performed all obligations required
to be performed by it pursuant to the terms of this Agreement at or prior to the
Closing Date; (C) no stop order suspending the effectiveness of the Registration
Statement has been issued and no proceeding for that purpose has been instituted
or taken or, to the knowledge of any of the Plains Parties, threatened by the
Commission, and all requests for additional information on the part of the
Commission have been complied with or otherwise satisfied; and (D) no event
contemplated by subsection (i) of this Section 8 in respect of the Partnership,
the Operating Partnerships or the General Partner shall have occurred.

          (n) On or prior to the date hereof, the Partnership shall have
furnished to you a letter substantially in the form of Exhibit B hereto from
each officer and each director of the General Partner.

                                      -37-
<PAGE>

          All such opinions, certificates, letters and other documents referred
to in this Section 8 will be in compliance with the provisions hereof only if
they are reasonably satisfactory in form and substance to you and your counsel.
The Partnership shall furnish to the Underwriters conformed copies of such
opinions, certificates, letters and other documents in such number as they shall
reasonably request.

          The several obligations of the Underwriters to purchase Additional
Units hereunder are subject to the satisfaction on and as of any Option Closing
Date of the conditions set forth in this Section 8, except that, if the Option
Closing Date is other than the Closing Date, the certificates, opinions and
letters referred to in paragraphs (c) through (h), (l) and (m) shall be dated
the Option Closing Date in question and the opinions called for by paragraphs
(c), (d), (e) and (g), as applicable, shall be revised to reflect the sale of
Additional Units.

          9.   Expenses.  The Partnership agrees to pay the following costs and
expenses and all other costs and expenses incident to the performance by it of
its obligations hereunder:  (i) the preparation, printing or reproduction, and
filing with the Commission of the Registration Statement (including financial
statements and exhibits thereto), each Prepricing Prospectus, the Prospectus,
and each amendment or supplement to any of them; (ii) the printing (or
reproduction) and delivery (including postage, air freight charges and charges
for counting and packaging) of such copies of the Registration Statement, each
Prepricing Prospectus, the Prospectus, and all amendments or supplements to any
of them as may be reasonably requested for use in connection with the offering
and sale of the Units; (iii) the preparation, printing, authentication, issuance
and delivery of certificates for the Units, including any stamp taxes in
connection with the original issuance and sale of the Units; (iv) the printing
(or reproduction) and delivery of this Agreement, the preliminary and
supplemental Blue Sky Memoranda, and all other agreements or documents printed
(or reproduced) and delivered in connection with the offering of the Units; (v)
the registration of the Common Units under the Exchange Act and the listing of
the Units on the NYSE; (vi) the registration or qualification of the Units for
offer and sale under the securities or Blue Sky laws of the several states as
provided in Section 5(g) hereof (including the reasonable fees, expenses and
disbursements of counsel for the Underwriters relating to the preparation,
printing or reproduction, and delivery of the preliminary and supplemental Blue
Sky Memoranda and such registration and qualification); (vii) the filing fees in
connection with any filings required to be made with the National Association of
Securities Dealers, Inc.; (viii) the transportation and other expenses incurred
by or on behalf of officers and employees of the Partnership in connection with
presentations to prospective purchasers of the Units; and (ix) the fees and
expenses of the Partnership's accountants and the fees and expenses of counsel
(including local and special counsel) for the Partnership.

          It is understood, however, that except as otherwise provided in this
Section 9 and Section 5(j) hereof, the Underwriters will pay all of their own
costs and expenses, including the fees of their counsel, transfer taxes on any
resale of the Units by any Underwriter, any advertising expenses connected with
any offers they may make and the transportation and other expenses incurred by
the Underwriters on their own behalf in connection with presentations to
prospective purchasers of the Units.

                                      -38-
<PAGE>

          10.  Effective Date of Agreement. This Agreement shall become
effective: (i) upon the execution and delivery hereof by the parties hereto or
(ii) if, at the time this Agreement is executed and delivered, it is necessary
for the Registration Statement or a post-effective amendment thereto to be
declared effective before the offering of the Units may commence, when
notification of the effectiveness of the Registration Statement or such post-
effective amendment has been released by the Commission.  Until such time as
this Agreement shall have become effective, it may be terminated by the
Partnership by notifying you, or by you, by notifying the Partnership.

          If any one or more of the Underwriters shall fail or refuse to
purchase Units which it or they are obligated to purchase hereunder on the
Closing Date, and the aggregate number of Units which such defaulting
Underwriter or Underwriters are obligated but fail or refuse to purchase is not
more than one-tenth of the aggregate number of the Units which the Underwriters
are obligated to purchase on the Closing Date, each non-defaulting Underwriter
shall be obligated, severally, in the proportion which the number of Firm Units
set forth opposite its name in Schedule I hereto bears to the aggregate number
of Firm Units set forth opposite the names of all non-defaulting Underwriters or
in such other proportion as you may specify in accordance with Section 20 of the
Master Agreement Among Underwriters of Salomon Smith Barney Inc., to purchase
the Units which such defaulting Underwriter or Underwriters are obligated, but
fail or refuse, to purchase.  If any one or more of the Underwriters shall fail
or refuse to purchase Units which it or they are obligated to purchase on the
Closing Date and the aggregate number of Units with respect to which such
default occurs is more than one-tenth of the aggregate number of Units which the
Underwriters are obligated to purchase on the Closing Date and arrangements
satisfactory to you and the Partnership for the purchase of such Units by one or
more non-defaulting Underwriters or other party or parties approved by you and
the Partnership are not made within 36 hours after such default, this Agreement
will terminate without liability on the part of any party hereto (other than the
defaulting Underwriter).  In any such case which does not result in termination
of this Agreement, either you or the Partnership shall have the right to
postpone the Closing Date, but in no event for longer than seven days, in order
that the required changes, if any, in the Registration Statement and the
Prospectus or any other documents or arrangements may be effected.  If any one
or more of the Underwriters shall fail or refuse to purchase Additional Units
which it or they are obligated to purchase hereunder on the Option Closing Date,
each non-defaulting Underwriter shall be obligated, severally, in the proportion
which the number of Firm Units set forth opposite its name in Schedule I hereto
bears to the aggregate number of Firm Units set forth opposite the names of all
non-defaulting Underwriters or in such other proportion as you may specify in
accordance with Section 20 of the Master Agreement Among Underwriters of Salomon
Smith Barney Inc., to purchase the Additional Units which such defaulting
Underwriter or Underwriters are obligated, but fail or refuse, to purchase.  Any
action taken under this paragraph shall not relieve any defaulting Underwriter
from liability in respect of any such default of any such Underwriter under this
Agreement.  The term "Underwriter" as used in this Agreement includes, for all
purposes of this Agreement, any party not listed in Schedule I hereto who, with
your approval and the approval of the Partnership, purchases Units which a
defaulting Underwriter is obligated, but fails or refuses, to purchase.

                                      -39-
<PAGE>

          Any notice under this Section 10 may be given by telegram, telecopy or
telephone but shall be subsequently confirmed by letter.

          11.  Termination of Agreement.  This Agreement shall be subject to
termination in your absolute discretion, without liability on the part of any
Underwriter to any Plains Party, by notice to the Partnership, if prior to the
Closing Date or any Option Closing Date (if different from the Closing Date and
then only as to the Additional Units), as the case may be, (i) trading in the
Common Units shall have been suspended by the Commission or the NYSE or trading
in securities generally on the New York Stock Exchange, the American Stock
Exchange or the Nasdaq National Market shall have been suspended or limited or
minimum prices shall have been established, (ii) a banking moratorium shall have
been declared either by federal or New York or Texas state authorities, or (iii)
there shall have occurred any outbreak or escalation of hostilities, declaration
by the United States of a national emergency or war, or other calamity or crisis
the effect of which on financial markets is such as to make it, in the sole
judgment of the Underwriters, impractical or inadvisable to proceed with the
offering or delivery of the Units as contemplated by the Prospectus (exclusive
of any supplement thereto).  Notice of such termination may be given to the
Partnership by telegram, telecopy or telephone and shall be subsequently
confirmed by letter.

          12.  Information Furnished by the Underwriters.  The statements set
forth in the last paragraph on the cover page, and the statements in the first,
third, eighth, ninth, tenth and twelfth paragraphs under the caption
"Underwriting" in any Prepricing Prospectus and in the Prospectus, constitute
the only information furnished by or on behalf of the Underwriters through you
as such information is referred to in Sections 6(a) and 7 hereof.

          13.  Miscellaneous.  Except as otherwise provided in Sections 5, 10
and 11 hereof, notice given pursuant to any provision of this Agreement shall be
in writing and shall be delivered (i) if to any of the Plains Parties, at the
office of the Partnership at 500 Dallas, Suite 700, Houston, Texas 77002,
Attention:  Michael R. Patterson, or (ii) if to you, care of Salomon Smith
Barney Inc., 388 Greenwich Street, New York, New York 10013, Attention: Manager,
Investment Banking Division.

          This Agreement has been and is made solely for the benefit of the
several Underwriters, the Plains Parties, their directors and officers, and the
other controlling persons referred to in Section 7 hereof and their respective
successors and assigns, to the extent provided herein, and no other person shall
acquire or have any right under or by virtue of this Agreement. Neither the term
"successor" nor the term "successors and assigns" as used in this Agreement
shall include a purchaser from any Underwriter of any of the Units in his status
as such purchaser.

          14.  Applicable Law; Counterparts.  This Agreement shall be governed
by and construed in accordance with the laws of the State of New York applicable
to contracts made and to be performed within the State of New York.

                                      -40-
<PAGE>

          This Agreement may be signed in various counterparts which together
constitute one and the same instrument.  If signed in counterparts, this
Agreement shall not become effective unless at least one counterpart hereof
shall have been executed and delivered on behalf of each party hereto.

                                      -41-
<PAGE>

          Please confirm that the foregoing correctly sets forth the agreement
among the Plains Parties and the Underwriters.

                              Very truly yours,

                              PLAINS ALL AMERICAN PIPELINE, L.P.

                              By: PLAINS ALL AMERICAN INC.
                                     its General Partner


                                  By:
                                     -----------------------------------------
                                     Name: Greg L. Armstrong
                                     Title:  Chairman of the Board and Chief
                                             Executive Officer

                              PLAINS MARKETING, L.P.

                              By: PLAINS ALL AMERICAN INC.
                                     its General Partner


                                  By:
                                     -----------------------------------------
                                     Name: Greg L. Armstrong
                                     Title:  Chairman of the Board and Chief
                                             Executive Officer

                              ALL AMERICAN PIPELINE, L.P.

                              By: PLAINS ALL AMERICAN INC.
                                     its General Partner


                                  By:
                                     -----------------------------------------
                                     Name: Greg L. Armstrong
                                     Title:  Chairman of the Board and Chief
                                             Executive Officer
<PAGE>

                              PLAINS SCURLOCK PERMIAN, L.P.

                              By: PLAINS ALL AMERICAN INC.
                                     its General Partner


                                  By:
                                     -----------------------------------------
                                     Name: Greg L. Armstrong
                                     Title:  Chairman of the Board and Chief
                                             Executive Officer

                              PLAINS ALL AMERICAN INC.


                                  By:
                                     -----------------------------------------
                                     Name: Greg L. Armstrong
                                     Title:  Chairman of the Board and Chief
                                             Executive Officer

                              PAAI LLC

                              By:  PLAINS ALL AMERICAN INC.
                                     its Sole Member

                                  By:
                                     -----------------------------------------
                                     Name: Greg L. Armstrong
                                     Title:  Chairman of the Board and Chief
                                                   Executive Officer

                              SCURLOCK PERMIAN, LLC


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

                              SCURLOCK PERMIAN PIPE LINE, LLC


                                  By:
                                     -----------------------------------------
                                     Name:
                                     Title:
<PAGE>

Confirmed as of the date first
above mentioned on behalf of
the Underwriters named in Schedule I
hereto.

SALOMON SMITH BARNEY INC.
GOLDMAN, SACHS & CO.
A.G. EDWARDS & SONS, INC.
FIRST UNION SECURITIES, INC.

By:  SALOMON SMITH BARNEY INC.


By:
   ------------------------------------
     Authorized Representative
<PAGE>

                                   SCHEDULE I
                       Plains All American Pipeline, L.P.
<TABLE>
<CAPTION>
                                                 Number of Firm Units
          Underwriter                              to be Purchased
- -------------------------------                  --------------------
<S>                                             <C>

Salomon Smith Barney Inc. ......................
Goldman, Sachs & Co. ...........................
A.G. Edwards & Sons, Inc. ......................
First Union Securities, Inc. ...................
                                                           ---------
Total                                                      2,600,000
                                                           =========
</TABLE>
<PAGE>

                                   EXHIBIT A

<TABLE>
<CAPTION>
Entity                                   Jurisdiction in which registered or qualified
- --------------------------------   ----------------------------------------------------------
<S>                                <C>
Partnership                        Texas
Plains Marketing, L.P.             Arizona, California, Colorado, Florida, Illinois, Kansas,
                                   Louisiana, Mississippi, New Mexico, Oklahoma, Texas
All American Pipeline, L.P.        Arizona, California, New Mexico
Plains Scurlock Permian, L.P.      Texas
Plains All American Inc.           Alabama, Arizona, California, Colorado, Florida,
                                   Illinois, Kansas, Louisiana, Mississippi, New Mexico, Oklahoma,
                                   Texas
Scurlock Permian, LLC              Alabama, Arkansas, Colorado, Illinois, Indiana, Kansas,
                                   Kentucky, Louisiana, Minnesota, Mississippi, Missouri,
                                   Montana, Nebraska, New Mexico, North Dakota, Oklahoma,
                                   South Dakota, Texas, Utah, Wyoming
Scurlock Permian Pipe Line,        Illinois, Louisiana, Mississippi, North Dakota, Texas
 LLC
</TABLE>

                                       1
<PAGE>

                                   EXHIBIT B

   [Letterhead of officer, director or holder of Common Units or Subordinated
                                     Units]

                       Plains All American Pipeline, L.P.
                        Public Offering of Common Units
                        -------------------------------

Salomon Smith Barney Inc.
Goldman, Sachs & Co.
A.G. Edwards & Sons, Inc.
First Union Securities, Inc.
c/o Salomon Smith Barney, Inc.
388 Greenwich Street
New York, New York 10013

Dear Sirs:

          This letter is being delivered to you in connection with the proposed
Underwriting Agreement (the "Underwriting Agreement") among Plains All American
Pipeline, L.P., a Delaware limited partnership (the "Partnership"), Plains
Marketing, L.P., All American Pipeline, L.P., Plains Scurlock Permian, L.P.,
Plains All American Inc., PAAI LLC, Scurlock Permian, LLC, Scurlock Permian Pipe
Line, LLC, Salomon Smith Barney Inc., Goldman, Sachs & Co., A.G. Edwards & Sons,
Inc., and First Union Securities, Inc., relating to an underwritten public
offering of common units representing limited partner interests (the "Common
Units") of the Partnership.

          To induce you to enter into the Underwriting Agreement, the
undersigned agrees that it will not offer, sell, contract to sell or otherwise
dispose of any Common Units or Subordinated Units (as defined in the
Underwriting Agreement), any securities that are convertible into, or
exercisable or exchangeable for, or that represent the right to receive, Common
Units or Subordinated Units or any securities that are senior to or pari passu
with Common Units for a period of 90 days after the date of the Prospectus (as
defined in the Underwriting Agreement) without the prior written consent of
Salomon Smith Barney Inc.

         If for any reason the Underwriting Agreement is terminated before the
Closing Date (as defined in the Underwriting Agreement), the agreement set forth
above shall likewise be terminated.

                    Yours very truly,

                    [Signature of officer, director or common Unitholder]

                    [Name and address of officer, director or common Unitholder]

                                       1

<PAGE>

                                                                     EXHIBIT 5.1

                                 September 29, 1999



Plains All American Pipeline, L.P.
500 Dallas
Suite 700
Houston, Texas 77002

Gentlemen:

          We have acted as counsel to Plains All American Pipeline, L.P., a
Delaware limited partnership (the "Partnership"), and Plains All American Inc.,
a Delaware corporation and the general partner of the Partnership, in connection
with the registration under the Securities Act of 1933, as amended (the "Act"),
of the offering and sale of up to an aggregate of 2,600,000 common units
representing limited partner interests in the Partnership (the "Common Units").

          As the basis for the opinion hereinafter expressed, we have examined
such statutes, regulations, corporate records and documents, certificates of
corporate and public officials, and other instruments as we have deemed
necessary or advisable for the purposes of this opinion.  In such examination we
have assumed the authenticity of all documents submitted to us as originals and
the conformity with the original documents of all documents submitted to us as
copies.

          Based on the foregoing and on such legal considerations as we deem
relevant, we are of the opinion that:

     1.   The Partnership has been duly formed and is validly existing as a
limited partnership under the Delaware Revised Uniform Limited Partnership Act.

     2.   The Common Units will, when issued and paid for as described in the
Partnership's Registration Statement on Form S-1 (File No. 333-86907) relating
to the Common Units, as amended (the "Registration Statement"), be duly
authorized, validly issued, fully paid and nonassessable, except as such
nonassessability may be affected by the matters described in the prospectus
included in the Registration Statement (the "Prospectus") under the caption "The
Partnership Agreement--Limited Liability."

     We hereby consent to the use of this opinion as an exhibit to the
Registration Statement and to the reference to us under the caption "Validity of
the Common Units" in the Prospectus.

                              Very truly yours,


                              /s/ Andrews & Kurth L.L.P.
                              --------------------------------
                              Andrews & Kurth L.L.P.

<PAGE>

                                                                     EXHIBIT 3.9

                       CERTIFICATE OF LIMITED PARTNERSHIP

                                       OF

                         PLAINS SCURLOCK PERMIAN, L.P.

     The undersigned represents that it has formed a limited partnership
pursuant to the Delaware Revised Uniform Limited Partnership Act (the "Act") and
that the undersigned has executed this Certificate in compliance with the
requirements of the Act.  The undersigned further states:

     1. The name of the limited partnership is PLAINS SCURLOCK PERMIAN, L.P.
     (the "Partnership").

     2. The address of the registered office of the Partnership in the State of
     Delaware and the name and address of the registered agent of the
     Partnership required to be maintained by Section 17-104 of the Act at such
     address are as follows:

             Name and Address
            of Registered Agent         Address of Registered Office
      -------------------------------   ----------------------------
        Corporation Service Company           1013 Centre Road
             1013 Centre Road            Wilmington, DE 19805-1297
      Wilmington, Delaware 19805-1297

     3. The name and business address of the General Partner is as follows:

          General Partner               Address
      ------------------------   ---------------------
      Plains All American Inc.   500 Dallas, Suite 700
                                 Houston, Texas 77002

     WHEREFORE, the undersigned has executed this Certificate as of the 29th day
of April, 1999.

                                        PLAINS ALL AMERICAN INC.
                                           as General Partner


                                        By:  /s/ Michael R. Patterson
                                            -------------------------------
                                        Name:  Michael R. Patterson
                                        Title:  Senior Vice President

<PAGE>

                                                                     EXHIBIT 8.1



                               September 29, 1999




Plains All American Pipeline, L.P.
500 Dallas
Suite 700
Houston, Texas 77002


     Re:  Registration Statement on Form S-1

Ladies and Gentlemen:

          We have acted as special counsel in connection with the Registration
Statement on Form S-1, Registration No. 333-86907 (the "Registration Statement")
of Plains All American Pipeline, L.P. (the "Partnership"), relating to the
registration of the offering and sale (the "Offering") of 2,600,000 common units
representing limited partner interests in the Partnership (the "Common Units").
In connection therewith, we prepared the discussion set forth under the caption
"Tax Considerations" (the "Discussion") in the Registration Statement.
Capitalized terms used and not otherwise defined herein are used as defined in
the Registration Statement.

          The Discussion, subject to the qualifications stated therein,
constitutes our opinion as to the material United States federal income tax
consequences for purchasers of Common Units pursuant to the Offering.

          We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the use of our name in the Discussion.  The
issuance of such consent does not concede that we are an "expert" for the
purposes of the Securities Act of 1933.

                                             Very truly yours,

                                             /s/ ANDREWS & KURTH L.L.P.

                                             Andrews & Kurth L.L.P.

1117/1216


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