UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D
                    Under the Securities Exchange Act of 1934
                               (Amendment No. 2)*



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

                                   Valero L.P.
--------------------------------------------------------------------------------
                                (Name of Issuer)

               Common Units representing limited partner interests
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   91913W 10 4
                                 --------------
                                 (CUSIP Number)

                                 Jay D. Browning
                            Valero Energy Corporation
                                One Valero Place
                            San Antonio, Texas 78212
                                 (210) 370-2000
--------------------------------------------------------------------------------
            (Name, Address and Telephone Number of Person Authorized
                     to Receive Notices and Communications)


                                 August 11, 2003
                      ------------------------------------
                  (Date of Event which Requires Filing of this
                                   Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  that is the subject of this  Schedule  13D, and is filing this
schedule because of ss.ss.240.13d-1(e),  240.13d-1(f) or 240.13d-1(g), check the
following box [ ].

Note:  Schedules  filed in paper format shall include a signed original and five
copies of the  schedule,  including  all exhibits.  See  ss.240.13d-7  for other
parties to whom copies are to be sent.

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).





                                  SCHEDULE 13D

CUSIP No.                               91913W 10 4           Page 2 of 12 Pages

--------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          I.R.S.   IDENTIFICATION  NOS. OF ABOVE PERSONS  (ENTITIES ONLY)
                     Valero Energy Corporation
                     74-1828067
--------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
                                                                    (a)    [ ]

                                                                    (b)    [ ]
--------------------------------------------------------------------------------
3         SEC USE ONLY


--------------------------------------------------------------------------------
4         SOURCE OF FUNDS *
                   OO
--------------------------------------------------------------------------------
5         CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
          TO ITEMS 2(d) OR  2(e)                                           [ ]
--------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION

                   Delaware
--------------------------------------------------------------------------------
           NUMBER OF             7       SOLE VOTING POWER
            SHARES                         621,729 Common Units of Valero L.P.
         BENEFICIALLY            -----------------------------------------------
           OWNED BY              8       SHARED VOTING POWER
             EACH                          -0-
           REPORTING             -----------------------------------------------
            PERSON               9       SOLE DISPOSITIVE POWER
             WITH                          621,729 Common Units of Valero L.P.
                                 -----------------------------------------------
                                 10      SHARED DISPOSITIVE POWER
                                           -0-
--------------------------------------------------------------------------------
11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                  621,729 Common Units of Valero L.P.
--------------------------------------------------------------------------------
12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES *
                                                                            [ ]
--------------------------------------------------------------------------------
13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                  4.63%
--------------------------------------------------------------------------------
14        TYPE OF REPORTING PERSON *

                   HC, CO
--------------------------------------------------------------------------------

                                       *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                                   SCHEDULE 13D

CUSIP No.                               91913W 10 4           Page 3 of 12 Pages
--------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
          TPI Petroleum, Inc.
          38-0757140
--------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                        (a)    [ ]
                                                        (b)    [ ]
--------------------------------------------------------------------------------
3         SEC USE ONLY


--------------------------------------------------------------------------------
4         SOURCE OF FUNDS*

                   OO
--------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
          PURSUANT TO ITEMS 2(d) OR  2(e)                      [ ]

--------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION
                   Michigan
--------------------------------------------------------------------------------
           NUMBER OF             7       SOLE VOTING POWER
            SHARES                              -0-
         BENEFICIALLY            -----------------------------------------------
           OWNED BY              8       SHARED VOTING POWER
             EACH                        614,572 Common Units of Valero L.P.
           REPORTING             -----------------------------------------------
            PERSON               9       SOLE DISPOSITIVE POWER
             WITH                               -0-
                                 -----------------------------------------------
                                 10      SHARED DISPOSITIVE POWER
                                         614,572 Common Units of Valero L.P.
--------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                   614,572 Common Units of Valero L.P.
--------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                               [ ]
--------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                   4.57%
--------------------------------------------------------------------------------
14        TYPE OF REPORTING PERSON

                   HC, CO
--------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  SCHEDULE 13D

CUSIP No.                               91913W 10 4           Page 4 of 12 Pages
--------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                   Diamond Shamrock Refining and Marketing Company
                   74-2505379
--------------------------------------------------------------------------------

2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                      (a)    [ ]
                                                      (b)    [ ]
--------------------------------------------------------------------------------
3         SEC USE ONLY

--------------------------------------------------------------------------------
4         SOURCE OF FUNDS*
                   OO
--------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
          TO ITEMS 2(d) OR  2(e)                             [ ]
--------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION
                   Delaware
--------------------------------------------------------------------------------
           NUMBER OF             7       SOLE VOTING POWER
            SHARES                              -0-
         BENEFICIALLY            -----------------------------------------------
           OWNED BY              8       SHARED VOTING POWER
             EACH                        621,729 Common Units of Valero L.P.
           REPORTING             -----------------------------------------------
            PERSON               9       SOLE DISPOSITIVE POWER
             WITH                               -0-
                                 -----------------------------------------------
                                 10      SHARED DISPOSITIVE POWER
                                         621,729 Common Units of Valero L.P.
--------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   621,729 Common Units of Valero L.P.
--------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                 [ ]
--------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                   4.63%
--------------------------------------------------------------------------------
14        TYPE OF REPORTING PERSON
                   HC, CO
--------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!





                                  SCHEDULE 13D

CUSIP No.                               91913W 10 4           Page 5 of 12 Pages
--------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
             Sigmor Corporation
             75-1828463
--------------------------------------------------------------------------------

2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                              (a)    [ ]
                                                              (b)    [ ]
--------------------------------------------------------------------------------
3         SEC USE ONLY

--------------------------------------------------------------------------------
4         SOURCE OF FUNDS*
                   OO
--------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) OR  2(e)                                        [ ]
--------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION
                   Delaware
-------------------------------- ------- ---------------------------------------
           NUMBER OF             7       SOLE VOTING POWER
            SHARES                             -0-
         BENEFICIALLY            -----------------------------------------------
           OWNED BY              8       SHARED VOTING POWER
             EACH                        614,572 Common Units of Valero L.P.
           REPORTING             -----------------------------------------------
            PERSON               9       SOLE DISPOSITIVE POWER
             WITH                              -0-
                                 -----------------------------------------------
                                 10      SHARED DISPOSITIVE POWER
                                         614,572 Common Units of Valero L.P.
--------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   614,572 Common Units of Valero L.P.
--------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                    [ ]
--------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
               4.57%
--------------------------------------------------------------------------------
14        TYPE OF REPORTING PERSON
                   HC, CO
--------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!





                                  SCHEDULE 13D


CUSIP No.                               91913W 10 4           Page 6 of 12 Pages
--------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
             The Shamrock Pipe Line Corporation
             75-6012115
--------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                               (a)    [ ]
                                                               (b)    [ ]
--------------------------------------------------------------------------------
3         SEC USE ONLY


--------------------------------------------------------------------------------
4         SOURCE OF FUNDS*
                   OO
--------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) OR  2(e)                                         [ ]
--------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION
                   Delaware
--------------------------------------------------------------------------------
           NUMBER OF             7       SOLE VOTING POWER
            SHARES                               -0-
         BENEFICIALLY            -----------------------------------------------
           OWNED BY              8       SHARED VOTING POWER
             EACH                        614,572 Common Units of Valero L.P.
           REPORTING             -----------------------------------------------
            PERSON               9       SOLE DISPOSITIVE POWER
             WITH                                 -0-
                                 -----------------------------------------------
                                 10      SHARED DISPOSITIVE POWER
                                         614,572 Common Units of Valero L.P.
--------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   614,572 Common Units of Valero L.P.
--------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                    [ ]
--------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                   4.57%
--------------------------------------------------------------------------------
14        TYPE OF REPORTING PERSON
                   HC, CO
--------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!





                                  SCHEDULE 13D

CUSIP No.                               91913W 10 4           Page 7 of 12 Pages
--------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
             Diamond Shamrock Refining Company, L.P.
             74-2691167
--------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                               (a)    [ ]
                                                               (b)    [ ]
--------------------------------------------------------------------------------
3         SEC USE ONLY


--------------------------------------------------------------------------------
4         SOURCE OF FUNDS*
                   OO
--------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) OR  2(e)                                         [ ]
--------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION
                   Delaware
--------------------------------------------------------------------------------
           NUMBER OF             7       SOLE VOTING POWER
            SHARES                               -0-
         BENEFICIALLY            -----------------------------------------------
           OWNED BY              8       SHARED VOTING POWER
             EACH                        614,572 Common Units of Valero L.P.
           REPORTING             -----------------------------------------------
            PERSON               9       SOLE DISPOSITIVE POWER
             WITH                                -0-
                                 -----------------------------------------------
                                 10      SHARED DISPOSITIVE POWER
                                         614,572 Common Units of Valero L.P.
--------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   614,572 Common Units of Valero L.P.
--------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                       [ ]
--------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                   4.57%
--------------------------------------------------------------------------------

14        TYPE OF REPORTING PERSON
                   HC, PN
--------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!





                                  SCHEDULE 13D

CUSIP No.                               91913W 10 4           Page 8 of 12 Pages
--------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
            TPI Pipeline Corporation
            38-1347772
--------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                (a)    [ ]
                                                                (b)    [ ]
--------------------------------------------------------------------------------
3         SEC USE ONLY


--------------------------------------------------------------------------------
4         SOURCE OF FUNDS*
                   OO
--------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) OR  2(e)                                          [ ]
--------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION
                   Michigan
--------------------------------------------------------------------------------
           NUMBER OF             7       SOLE VOTING POWER
            SHARES                               -0-
         BENEFICIALLY            -----------------------------------------------
           OWNED BY              8       SHARED VOTING POWER
             EACH                        614,572 Common Units of Valero L.P.
           REPORTING             -----------------------------------------------
            PERSON               9       SOLE DISPOSITIVE POWER
             WITH                                -0-
                                 -----------------------------------------------
                                 10      SHARED DISPOSITIVE POWER
                                         614,572 Common Units of Valero L.P.
--------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   614,572 Common Units of Valero L.P.
--------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                      [ ]
--------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                   4.57%
--------------------------------------------------------------------------------
14        TYPE OF REPORTING PERSON
                   HC, CO
--------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!





                                  SCHEDULE 13D

CUSIP No.                               91913W 10 4           Page 9 of 12 Pages
--------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                   UDS Logistics, LLC
                   85-0470977
--------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                  (a)    [ ]
                                                                  (b)    [ ]
--------------------------------------------------------------------------------
3         SEC USE ONLY


--------------------------------------------------------------------------------
4         SOURCE OF FUNDS*
                   OO
--------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) OR  2(e)                                            [ ]
--------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION
                   Delaware
--------------------------------------------------------------------------------
           NUMBER OF             7       SOLE VOTING POWER
            SHARES                               -0-
         BENEFICIALLY            -----------------------------------------------
           OWNED BY              8       SHARED VOTING POWER
             EACH                        614,572 Common Units of Valero L.P.
           REPORTING             -----------------------------------------------
            PERSON               9       DISPOSITIVE POWER
             WITH                                -0-
                                 -----------------------------------------------
                                 10      SHARED DISPOSITIVE POWER
                                        614,572 Common Units of Valero L.P.
--------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   614,572 Common Units of Valero L.P.
--------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                         [ ]
--------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                   4.57%
--------------------------------------------------------------------------------
14        TYPE OF REPORTING PERSON
                   HC, CO
--------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!






                                                             Page 10 of 12 Pages


Item 1.  Security and Issuer

     This  Amendment  No.2 (the  "Amendment")  to Schedule 13D is being filed by
Valero Energy Corporation ("Valero Energy") and certain of its subsidiaries, TPI
Petroleum,  Inc.,  Diamond  Shamrock  Refining  and  Marketing  Company,  Sigmor
Corporation,  The Shamrock  Pipe Line  Corporation,  Diamond  Shamrock  Refining
Company,  L.P., TPI Pipeline  Corporation and UDS Logistics  (collectively,  the
"Subsidiaries"  and together with Valero  Energy,  the  "Reporting  Persons") to
amend  the  Schedule  13D that was  previously  filed on March  25,  2003.  This
statement  relates to the common units  representing  limited partner  interests
(the  "Common  Units") of Valero  L.P.,  a  Delaware  limited  partnership  (the
"Partnership"),  which has its principal  executive offices at One Valero Place,
San Antonio, Texas 78212.

Item 2.  Identity and Background

     The  information  previously  furnished in response to Item 2 is amended to
add the following:

     On August 11,  2003,  the  Partnership  completed  a public  offering  (the
"Offering") of 1,236,250 common units  representing  limited partner  interests,
including common units issuable pursuant to an over-allotment  option granted to
the underwriter,  under the Partnership's  shelf registration  statement on Form
S-3 (Registration No. 333-89978).  The sale price of the common units was $41.15
per unit with an  underwriting  discount of $1.85.  The Offering  increased  the
amount of Common Units  outstanding from 12,205,822 to 13,442,072  Common Units,
reducing Valero Energy's  ownership of the Partnership's  Common Units to 4.63%.
Of the 13,442,072 Common Units outstanding,  73,319 are owned by an affiliate of
Valero Energy. The voting and dispositive rights with respect to 66,162 of these
73,319 Common Units have been relinquished.  Accordingly, these 66,162 units are
not included in the Common Units beneficially owned by the Reporting Person.

Item 4.  Purpose of Transaction

     The  information  previously  furnished in response to Item 4 is amended to
add the following:

     The  purpose of the  Offering  was to  generate  net  proceeds  for working
capital and general  partnership  purposes,  including  future  acquisitions and
expansion capital projects.

Item 5.  Interest in Securities of the Partnership

     The  information  previously  furnished in response to Item 5 is amended to
add the following:

     The following Reporting Persons,  TPI Petroleum,  Inc., Sigmor Corporation,
The Shamrock Pipe Line Corporation, Diamond Shamrock Refining Company, L.P., TPI
Pipeline  Corporation and UDS Logistics,  are deemed to be the beneficial owners
of 614,572  Common  Units,  which  constitute  approximately  4.57% of the total
issued and  outstanding  Common Units as of August 11, 2003 (based on 13,442,072
Common Units  outstanding  after giving effect to the  Offering.)  The following
Reporting  Persons,  Valero Energy and Diamond  Shamrock  Refining and Marketing
Company,  are deemed to be the beneficial owners of 621,729 Common Units,  which
constitute  approximately 4.63% of the total issued and outstanding Common Units
as of August 11, 2003. The Reporting  Persons also hold,  through UDS Logistics,
9,599,322  subordinated  units  representing  limited  partner  interests in the
Partnership.  Assuming the financial tests set forth in the agreement of limited
partnership of the  Partnership are met, all 9,599,322  subordinated  units will
automatically  convert into Common Units on a one-for-one basis on the first day
after the record date for  distributions  in respect of the quarter ending March
31, 2006. Further, all subordinated units will automatically convert into Common
Units on a one-for-one  basis prior to such date if the  unitholders  remove the
general  partner  of the  Partnership  without  cause and the units  held by the
general partner and its affiliates are not voted in favor of the removal.

     On August 11,  2003,  the  Reporting  Persons  ceased to be the  beneficial
owners of more than five percent of the Common Units.


                                                             Page 11 of 12 Pages

Item 6.  Contracts, Arrangements, Understandings or Relationships with respect
         to Securities of the Company

     The  information  previously  furnished in response to Item 6 is amended to
add the following:

     The Partnership entered into an Underwriting Agreement dated August 5, 2003
with Lehman Brothers Inc., (the "Underwriter") pursuant to which the Partnership
agreed to issue and sell to the Underwriter  1,075,000  Common Units and granted
to the  Underwriter  an option to purchase an additional  161,250  Common Units,
which the Underwriter exercised on August 6, 2003.



                                    Signature

     After reasonable  inquiry and to the best of our knowledge and belief,  the
undersigned  certify that the  information  set forth in this statement is true,
complete and correct.



Date: August 11, 2003            Valero Energy Corporation



                                 By:  /s/Jay D. Browning
                                    --------------------------------------------
                                 Name: Jay D. Browning
                                 Title: Vice President and Corporate Secretary


                                 TPI Petroleum, Inc.



                                 By:  /s/Jay D. Browning
                                    --------------------------------------------
                                 Name: Jay D. Browning
                                 Title: Vice President and Secretary


                                 Diamond Shamrock Refining and Marketing Company



                                 By:  /s/Jay D. Browning
                                    --------------------------------------------
                                 Name: Jay D. Browning
                                 Title: Vice President and Secretary




                                                             Page 12 of 12 Pages



                                 Sigmor Corporation



                                  By:  /s/Jay D. Browning
                                     -------------------------------------------
                                  Name: Jay D. Browning
                                  Title: Vice President and Secretary



                                  The Shamrock Pipe Line Corporation



                                  By:  /s/Jay D. Browning
                                     -------------------------------------------
                                  Name: Jay D. Browning
                                  Title: Vice President and Secretary



                                  Diamond Shamrock Refining Company, L.P.



                                  By:  /s/Jay D. Browning
                                     -------------------------------------------
                                  Name: Jay D. Browning
                                  Title: Vice President and Secretary



                                  TPI Pipeline Corporation



                                  By:  /s/Jay D. Browning
                                     -------------------------------------------
                                  Name: Jay D. Browning
                                  Title: Vice President and Secretary



                                  UDS Logistics, LLC



                                  By:  /s/Corky Davis
                                     -------------------------------------------
                                  Name: Corky Davis
                                  Title: Secretary