Document:

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                          FIRST AMENDMENT TO OMNIBUS AGREEMENT

         WHEREAS, Shamrock Logistics Operations, L.P. ("Operations") entered
into that certain Omnibus Agreement (the "Agreement") with Ultramar Diamond
Shamrock Corporation, on behalf of itself and its affiliates, effective April
16, 2001;

         WHEREAS, the Agreement provided for certain purchase options to be
exercisable by Operations, including an option to purchase a petroleum
products terminal at Ringgold, Texas for $6.5 million; and

         WHEREAS, the parties desire to amend the Agreement to provide for a
lower option purchase price to be payable to purchase the Ringgold terminal;

         THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which is acknowledged, the parties agree that the Option
Purchase Amount provided under the Agreement relating to the Ringgold Storage
Facility is hereby amended to be $5,200,000, effective November 1, 2001.

         IN WITNESS WHEREOF, the undersigned have set their hands hereto this
November 1, 2001.

                                       ULTRAMAR DIAMOND SHAMROCK
                                       CORPORATION, ON BEHALF OF ITSELF
                                       AND ITS AFFILIATES

                                       /s/ William R. Klesse
                                       --------------------------------
                                       William R. Klesse, its Executive
                                       Vice President

                                       SHAMROCK LOGISTICS OPERATIONS, L.P.
                                           BY: RIVERWALK LOGISTICS, L.P.,
                                           ITS GENERAL PARTNER
                                                 BY: SHAMROCK LOGISTICS
                                                 GP, LLC, ITS GENERAL
                                                 PARTNER

                                                 /s/ Curtis V. Anastasio
                                                 -------------------------
                                                 Curtis V. Anastasio, its
                                                 President and CEO<Page>

                                                                   EXHIBIT 10.12

                            RESTRICTED UNIT AGREEMENT

     This Restricted Unit Agreement ("Agreement"), effective as of the date set
forth at the end of this Agreement ("Grant Date"), is between VALERO L.P., a
Delaware limited partnership ("Valero LP"), and NAME, a Participant in the
Valero GP, LLC 2000 Long-Term Incentive Plan for Valero L.P. ("Participant");
who agree as follows:

     1.   INTRODUCTION. Pursuant to the 2000 Long-Term Incentive Plan for Valero
L.P. (as may be amended, the "Plan"), the board of directors of Valero GP, LLC
(the "General Partner") awarded X,XXX common Units of Valero LP ("Restricted
Units") under the plan to the participant. The parties hereby enter to into this
Agreement to evidence the terms conditions and restrictions applicable to the
Restricted Units.

     2.   THE PLAN, RESTRICTIONS ON TRANSFER, VESTING. The Participant has read
and understands the Plan, which is incorporated herein by reference for all
purposes, and agrees to the terms and conditions applicable to the Restricted
Units and the rights and powers of Valero LP and the General Partner as provided
therein. In addition, the Participant agrees as follows:

          2.01 Except as provided in the Plan and this Agreement, Restricted
     Units may not be sold, exchanged, pledged, hypothecated, transferred,
     garnished or otherwise disposed of or alienated prior to vesting. The
     Participant agrees that certificates representing the Restricted Units may
     be imprinted with a legend to this effect.

          2.02 The Restricted Units granted hereunder are subject to the
     following Restricted Periods, and will vest and accrue to Participant in
     the following increments; XXX Units on JANUARY 21, 2003; XXX Units on
     JANUARY 21, 2004; and XXX Units on JANUARY 21, 2005. The restrictions may
     terminate prior to the expiration of such period as set forth in the Plan
     Upon vesting, for each Restricted Unit granted hereunder, the Participant
     will be entitled to receive and unrestricted Common Unit of Valero LP.

          2.03 Valero LP shall retain all certificates representing Restricted
     Units, together with stockpowers executed by the Participant pertaining to
     such Restricted Units, until the restriction on such Units described in the
     Plan or contained in this Agreement lapse.

          2.04 If Restricted Units are forfeited, the transfer agent of Valero
     LP is instructed, upon confirmation by the Secretary of the General Partner
     of such forfeiture, to surrender the certificate representing such shares
     for cancellation.

     3.   DER GRANT. Subject to the following, the award of Restricted Units
granted hereunder includes a tandem Award of a number DERs equal to the number
of Restricted Units granted hereunder. Each DER shall entitle the Participate to
receive cash payments equal to the cash distributions made by Valero LP with
respect to its outstanding Common Units generally, provided that no cash
distributions shall be payable to or on behalf of the Participant with respect
to record dates before the Grant Date, or with respect to any record date
occuring after the Grant Date on which the Participant has forfeited the
Restricted Units per the terms of the Plan. The DERs shall lapse on the earlier
of (i) the date on which the Restricted Units are forfeited, (ii) the dates in
tandem

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with the vesting schedule for the Restricted Units set forth above, or (iii) a
Change of Control. In addition, subject to any forfeiture, the Participant will
have the right to vote such Restricted Units and to exercise all other rights,
powers and privileges of a holder of Valero LP Common Units with respect to such
Restricted Units, with the exception that the Participant will not be entitled
to delivery of the certificate(s) representing such Restricted Units until the
Restriction Period applicable to such Restricted Units or a portion thereof
shall have expired and unless all other vesting requirements with respect
thereto have been fulfilled.

     4.   LIMITATION. The Participant shall have no rights with respect to any
Restricted Units not expressly conferred by the Plan or this Agreement.

     5.   MISCELLANEOUS. All capitalized terms contained in this Agreement shall
have the definitions set forth in the Plan unless otherwise defined herein. This
Agreement shall be binding upon the parties hereto and their respective heirs,
legal representatives, successors and assigns.

     EFFECTIVE as of the 21ST day of JANUARY, 2002.

                                       VALERO L.P.
                                       by Riverwalk Logistics, L.P.
                                       its general partner
                                               by Valero GP, LLC
                                               its general partner

                                       William R. Klesse
                                       Executive Vice President

                                       -----------------------------------------
                                       NAME
                                       Participant<Page>

                                                                   EXHIBIT 10.13

                               OPERATING AGREEMENT

         THIS AGREEMENT is made and entered into as of the 1st day of January,
2002, by and among SHAMROCK LOGISTICS OPERATIONS, L.P., a Delaware limited
partnership (hereinafter referred to as "OPERATOR") and VALERO PIPELINE COMPANY,
a Delaware corporation ("VALERO") (with Operator and Valero each being referred
to herein as, a "Party" and collectively, the "Parties").

                              W I T N E S S E T H:
                              - - - - - - - - - -

         WHEREAS, Valero leases certain refined product pipeline assets,
terminals, pump stations and associated equipment, facilities and real estate
interests (collectively the "System") pursuant to that certain Pipeline and
Terminal Lease Agreement dated May 25, 2001 by and between Coastal Liquids
Partners, L.P., as lessor and Valero Marketing and Supply Company and Valero
Pipeline Company, collectively as lessee (the "Lease"), a copy of which is
attached hereto as Exhibit A and made a part hereof;

         WHEREAS, Valero desires to employ Operator to manage, operate, and
maintain the System; and

         WHEREAS, Operator is willing to manage, operate, and maintain the
System under the terms and conditions of this Agreement.

         NOW, THEREFORE, for and in consideration of the mutual covenants and
agreements herein contained, it is agreed by and among the Parties hereto as
follows:

                                    SECTION 1
                       APPOINTMENT, TERM, AND TERMINATION

1.1      Valero hereby appoints and employs Operator to manage, operate and
         maintain the System for and on behalf of Valero, and acting as Valero's
         agent in Valero's name, hereby authorizing and empowering Operator to
         do and perform any and all acts and things which Operator shall, in the
         exercise of its judgement, and consistent with the standard of care set
         forth in Section 2.2 below, know or determine is either necessary or
         proper for the management, operation, and maintenance of the System,
         subject to the specific limitations herein set forth and subject to the
         general authority of Valero as lessee of the System.

1.2      Either Party may terminate this Agreement upon at least thirty (30)
         days prior written notice to the other Party. Termination of this
         Agreement shall not release or discharge any Party from, or affect a
         Party's liabilities and obligations including, without limitation, its
         own indemnity obligations under this Agreement relating to the period
         prior to such termination.

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                                    SECTION 2
                    AGREEMENT, DUTIES AND POWERS OF OPERATOR

2.1      During the term of this Agreement, Operator, as agent and as operator
         for Valero, shall assume responsibility for the scheduling, operation,
         maintenance and repair of the System. Without limiting the generality
         of the foregoing and in accordance with Section 2.2 of this Agreement,
         Operator shall:

         (a)      Perform such activities as might be required to schedule,
                  receive, transport, deliver, and otherwise handle the volume
                  of refined products tendered for transportation in the System.

         (b)      Cause to be purchased for and in the name of Valero necessary
                  materials, supplies, and services for the use and benefit of
                  the System, as well as incur such expenses and cause Valero to
                  enter into such commitments as necessary in connection with
                  the proper operation, maintenance and repair of the System;
                  provided that any expenditures to be charged to Valero are
                  subject to the provisions of Section 4 hereof;

         (c)      Maintain continuous surveillance of the System, and
                  periodically inspect the System for damage and other unsafe
                  conditions, report any observed unsafe conditions to Valero
                  and perform or cause to be performed such repairs to the
                  System as required;

         (d)      Provide movement and scheduling services, including
                  nomination, processing, dispatching, creation and/or
                  collection of delivery tickets, bills of lading, inventories,
                  line balances, preparation of gain and loss reports necessary
                  to properly balance and account for all movements associated
                  with any portion of the System, and forecasts of volume
                  requirements to sustain sufficient inventories for the
                  terminals that are part of the System, including 30-day,
                  weekly, and daily forecasts;

         (e)      Monitor daily operations and perform and/or witness meter
                  calibrations and other means of measurement at regular
                  intervals to ensure measurement accuracy of the System within
                  generally accepted industry tolerances and standards. For
                  those meter calibrations not performed and/or witnessed by
                  Operator, Operator will use commercially reasonable efforts to
                  obtain calibration reports from independent third party
                  inspectors and operators;

         (f)      Maintain in a manner such that they shall be available for
                  periodic inspection, all as-built drawings or descriptions of
                  the System, construction and maintenance records, inspection
                  and testing records, operating procedures and manuals, custody
                  transfer documents, and such other records as may be required
                  by governmental authorities that have proper jurisdiction over
                  any portion of the System or as may be reasonably

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                  requested by Valero that are either provided by Valero or
                  generated by Operator under the terms of this Agreement;

         (g)      Maintain other suitable and proper records, including
                  operating records, and file such reports as required by
                  governmental agencies that have proper jurisdiction over any
                  portion of the System; and applicable regulations, or as
                  further set forth in this Agreement;

         (h)      Respond to emergencies in accordance with the standards sets
                  forth in Section 2.2 of this Agreement;

         (i)      Maintain and implement emergency plans as required by
                  applicable laws and regulations;

         (j)      Act as coordinator for Valero in contacts with government
                  agencies relating to the physical operation and maintenance of
                  the System, as required by applicable laws, regulations,
                  permit conditions or right-of way agreements including any
                  "one-call" systems;

         (k)      Provide, operate, and maintain a telemetry and data
                  communications system which is functionally equivalent to the
                  telemetry and data communications systems used by the System
                  on the date hereof for the safe and efficient use of the SCADA
                  System;

         (l)      Maintain, update, or change, as necessary, operating manuals,
                  monitoring programs, contingency plans, and training programs
                  that are provided by Valero for the purpose of satisfying or
                  complying with applicable laws, rules, regulations, and other
                  requirements of governmental authorities that have proper
                  jurisdiction over the operation of the System;

         (m)      Comply in all material respects with Valero's obligations
                  regarding management, operation, and maintenance of the System
                  contained in the Lease provided that Operator determines, in
                  its sole judgment, that such conduct is legally permissible;
                  and

         (n)      Any and all other functions and services necessary and/or
                  appropriate for the safe, efficient, and legally permissible
                  operation of the System.

2.2      Operator agrees to perform all services hereunder in a manner
         consistent with the usual and customary practices, codes, and standards
         of a prudent operator in the refined products pipeline industry and in
         accordance with valid and applicable laws, rules, and regulations of
         any government authorities having proper jurisdiction over any portion
         of the System.

2.3      If and to the extent that any fees, tariff revenues, and other income
         are received or collected by Operator which are related to the System,
         including tariff revenues

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         for shipment of refined products across the System and fees associated
         with the System's terminal operations, all such fees, tariff revenues,
         and other income shall inure to the benefit of and become the property
         of Valero. Operator will submit all such fees to Valero immediately
         upon receipt thereof.

         2.4 Notwithstanding anything in this Agreement to the contrary, Valero
             may, at its option except where prohibited by applicable law, rule,
             or regulation, participate in any business plan development,
             operational planning, and oversight activities related to the
             System.

                                    SECTION 3
                         ADDITIONAL SERVICES OF OPERATOR

3.1      CATHODIC PROTECTION. During the term of this Agreement, Operator will
         maintain cathodic protection for the System in accordance with the
         standard set forth in Section 2.2 hereof. Such maintenance includes,
         but is not limited to, periodic inspection and testing of the cathodic
         protection.

3.2      RIGHT OF WAY MAINTENANCE AND FLY OVERS.

        (a)       During the term of this Agreement, Operator will maintain the
                  System right of way, including all pump stations and Terminals
                  along its course. Such maintenance includes, but is not
                  limited to, mowing, repairing and maintaining signs and
                  markers, and repairing and maintaining fences.

         (b)      Lessee shall, in accordance with Section 2.2 hereof, inspect
                  the surface conditions on or adjacent to the System
                  right-of-way. Methods of inspection include walking, driving,
                  flying or other appropriate means of traversing the
                  right-of-way.

                                    SECTION 4
                COMPENSATION OF OPERATOR AND CAPITAL EXPENDITURES

4.1      COMPENSATION OF OPERATOR. For the services to be performed by Operator
         and/or its affiliates pursuant to this Agreement, Valero shall pay
         Operator as follows:

         (a)      On or before the 15th day of each calendar month, Operator
                  will allocate to Valero a monthly cost share for the following
                  internal support services: (i) pipeline right-of-way
                  management, (ii) general administrative services, (iii)
                  pipeline and terminals engineering services, (iv) corrosion
                  control management, (v) pipeline safety and regulatory
                  services, (vi) control center management, and (vii) SCADA and
                  terminal automation services (collectively, the "Internal
                  Support Services" and individually, a "Internal Support
                  Service"). The percentage of costs to be allocated to the
                  System for each Internal Support Service is different. The
                  formula for determine the percentage for each Internal Support
                  Service is set forth below:

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                  (1) For items nos. 4.1(a)(i),(ii), and (iii) generally
                      described above, the allocated percentage is determined by
                      dividing (x) the total number of miles of pipeline located
                      within the System by (y) the total number of miles of
                      pipeline that have been maintained by Operator during the
                      same period of time.

                  (2) For items nos. 4.1(a)(iv), (v), and (vi) generally
                      described above, the allocated percentage is based on (x)
                      a good faith estimate of the number of man-hours spent
                      managing any portion of the System for each Internal
                      Support Service compared to (y) a good faith estimate of
                      the number of total man-hours that were expended during
                      the same time period for the same Internal Support Service
                      in connection with all pipeline systems maintained by
                      Operator.

                  (3) For item no 4.1(a)(vii) generally described above, the
                      allocated percentage is determined by dividing (x) the
                      total number of SCADA and terminal automation units
                      located within the System by (y) the total number of SCADA
                      and terminal automation units that have been maintained by
                      Operator during the same period of time. .

         (b)      For all other out-of-pocket costs including, but not limited
                  to, materials, equipment rental, support services (including,
                  without limitation, outside legal, accounting, and
                  environmental, health, and safety ["EH&S"] fees), utility
                  costs, repairs made or incurred by Operator according to this
                  Agreement, expense projects (subject to the provisions of
                  Section 4.2(a), below), capital projects approved by Valero
                  and emergency expenditures incurred and paid by Operator
                  and/or its affiliates in connection with the performance of
                  its obligations hereunder, Operator shall provide Valero with
                  supporting documentation for all such costs, expenses, and
                  liabilities. Operator will invoice Valero by the 15th day of
                  each calendar month for all such reimbursable costs incurred
                  by Operator in connection with the System during the preceding
                  calendar month, and Valero will pay Operator or its designee
                  within ten (10) days after its receipt of Operator's invoice.

4.2      LIMITATIONS ON EXPENDITURES.

         (a)      Operator will obtain prior approval for expenditures of
                  $250,000 or more that Operator considers necessary for the
                  benefit of the System.

         (b)      Operator will comply with Valero's Authorization For
                  Expenditure ("AFE") policy, as such policy may be amended from
                  time to time. A current copy of the Valero's AFE policy is
                  attached to this Agreement as Exhibit "B" and made a part
                  hereof.

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4.3      EMERGENCY EXPENDITURES. In cases of emergency, as such is determined in
         Operator's sole discretion, Operator may proceed with expenditures for
         required work when such is necessary in Operator's judgement to keep
         the System operating, to restore the System to operating condition, or
         to eliminate or minimize damage to property or injury to death of
         persons, without the necessity of submitting such proposed expenditures
         in advance for approval by Valero. In such event, Operator shall, as
         soon as practical, notify Valero promptly by telephone, then confirmed
         in writing (by facsimile or overnight mail) of the existence or
         occurrence of the emergency. Such notice shall set forth the nature of
         the emergency, the corrective actions taken, and the estimated cost of
         such corrective action.

                                    SECTION 5
                                    INSURANCE

5.1      INSURANCE.

         (a)      During the entire term of this Agreement, Valero, at its own
                  cost, shall insure the System against all risks of physical
                  loss or damage. Valero will have its insurers waive their
                  rights of subrogation against Operator.

         (b)      During the entire term of this Agreement, Operator, at its own
                  cost and expense, shall provide (i) at least $5 Million in
                  General Comprehensive Liability Insurance coverage in
                  connection with its operation and maintenance of the System,
                  and (ii) maintain Workers' Compensation and Occupational
                  Disease Insurance in accordance with applicable Texas law, to
                  the same extent Operator insures its own assets of a similar
                  nature; provided, however, Operator may self-insure itself
                  against such risks provided it qualifies as a self-insurer
                  pursuant to the applicable Texas law. Operator will have its
                  insurers waive their rights of subrogation against Valero.

5.2      INSURANCE REQUIREMENTS FOR CONTRACTORS. Operator shall require all
         contractors and subcontractors employed by Operator under this
         Agreement to maintain insurance coverage similar in nature and amount
         that Operator generally requires such contractors to have for work
         performed on its own assets of a similar nature.

         Operator will make a reasonable good faith effort as promptly as
         practical to obtain from such contractors and subcontractors insurance
         certificates showing compliance with Operator's insurance requirements
         and to cause their insurers to name Operator and Valero as additional
         insured under all policies. Operator will make a reasonable good faith
         effort as promptly as practical to cause such contractors and
         subcontractors, to the extent permitted under applicable law, to

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         have their underwriters or insurers waive subrogation rights against
         Operator and Valero.

                                    SECTION 6
                           INDEMNIFICATION AND CLAIMS

6.1      INDEMNIFICATION BY VALERO. EXCEPT AS OTHERWISE SPECIFICALLY PROVIDED
         FOR IN SECTIONS 6.2 AND 6.3, BELOW, AND REGARDLESS OF THEORY OR
         THEORIES ALLEGED INCLUDING, WITHOUT LIMITATION, NEGLIGENCE (WHETHER
         SOLE, JOINT, OR CONCURRENT), STRICT LIABILITY, BREACH, OR VIOLATION OF
         LAW, RULE, OR REGULATION OF OR BY OPERATOR OR ANY THIRD PARTY, VALERO
         SHALL RELEASE, INDEMNIFY, HOLD HARMLESS, AND DEFEND OPERATOR, ITS
         SUBSIDIARIES AND CORPORATE AFFILIATES, AS WELL THE OFFICERS, DIRECTORS,
         EMPLOYEES, AGENTS, AND REPRESENTATIVES OF OPERATOR, ITS SUBSIDIARIES
         AND CORPORATE AFFILIATES (COLLECTIVELY, THE "SLO INDEMNITEES" AND
         INDIVIDUALLY, THE "SLO INDEMNITEE"), FROM AND AGAINST ANY AND ALL
         DAMAGES (AS DEFINED BELOW) ARISING OUT OF OR IN ANY WAY RELATING TO THE
         OPERATION, MAINTENANCE, OWNERSHIP, INSPECTION, TESTING, ALTERATION,
         REPLACEMENT, CHANGE IN SIZE OF, REPAIR, EXPANSION, TRANSITION,
         ENVIRONMENTAL REMEDIATION, OR MANAGEMENT OF THE SYSTEM TO THE EXTENT
         ANY SUCH DAMAGES ARE CAUSED BY (A) THE NEGLIGENCE OR WILLFUL MISCONDUCT
         OF VALERO, OR ANY OF ITS OFFICERS, DIRECTORS, EMPLOYEES, AGENTS, AND
         REPRESENTATIVES OR (B) ANY FACT, CIRCUMSTANCE, ACTION, OMISSION, OR
         CONDITION OCCURRING OR EXISTING AND RELATING TO THE SYSTEM PRIOR TO THE
         EFFECTIVE DATE OF THIS AGREEMENT, AS DETERMINED BY EITHER MUTUAL
         AGREEMENT OF THE PARTIES OR A FINAL, NON-APPEALABLE JUDGMENT OF A
         JUDICIAL BODY HAVING PROPER JURISDICTION OVER THE SUBJECT MATTER IN
         QUESTION. FOR PURPOSES OF THIS SECTION 6.1 AND SECTIONS 6.2 AND 6.3,
         BELOW, THE TERM "DAMAGES" SHALL MEAN ANY AND ALL (I) OBLIGATIONS, (II)
         LIABILITIES, (III) DAMAGES (INCLUDING BUT NOT LIMITED TO, INJURY TO OR
         DEATH OF PERSONS AND DAMAGES TO OR DESTRUCTION OR LOSS OF PROPERTY),
         (IV) LOSSES, (V) ACTIONS, (VI) SUITS, (VII) CLAIMS, (VIII) JUDGMENTS,
         ORDERS, DIRECTIVES, INJUNCTIONS, DECREES, FINES, PENALTIES,
         ASSESSMENTS, OR AWARDS OF ANY AUTHORITY, BUREAU, OR AGENCY, AND (IX)
         COSTS AND EXPENSES (INCLUDING, BUT NOT LIMITED TO, REASONABLE AND
         NECESSARY ATTORNEYS' FEES).

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6.2      INDEMNIFICATION BY OPERATOR. OPERATOR SHALL RELEASE, INDEMNIFY, HOLD
         HARMLESS, AND DEFEND VALERO AND ITS SUBSIDIARIES AND CORPORATE
         AFFILIATES, AS WELL AS THEIR OFFICERS, DIRECTORS, EMPLOYEES, AGENTS,
         AND REPRESENTATIVES (COLLECTIVELY, THE "VALERO INDEMNITEES") (UPON
         VALERO'S REQUEST) FROM AND AGAINST ANY AND ALL DAMAGES ARISING OUT OF
         OR IN ANY WAY RELATING TO THE OPERATION, MAINTENANCE, INSPECTION,
         TESTING, ALTERATION, REPLACEMENT, CHANGE IN SIZE OF, REPAIR, EXPANSION,
         TRANSITION, ENVIRONMENTAL REMEDIATION OR MANAGEMENT OF THE SYSTEM, TO
         THE EXTENT CAUSED BY THE NEGLIGENCE OR WILLFUL MISCONDUCT OF OPERATOR,
         ITS EMPLOYEES, AGENTS, CONTRACTORS, REPRESENTATIVES, OR ITS AFFILIATES,
         OR ANY EMPLOYEES, AGENTS, CONTRACTORS, OR REPRESENTATIVES OF ITS
         AFFILIATES AS DETERMINED BY EITHER MUTUAL AGREEMENT OF THE PARTIES OR A
         FINAL, NON-APPEALABLE JUDGMENT OF A JUDICIAL BODY HAVING PROPER
         JURISDICTION OVER THE SUBJECT MATTER IN QUESTION. NOTWITHSTANDING
         OPERATOR'S INDEMNITY OBLIGATIONS SET FORTH IN THIS SECTION 6.2, UNDER
         NO CIRCUMSTANCES SHALL SLO OR ANY SLO INDEMNITEE BE LIABLE TO VALERO OR
         ANY THIRD PARTY FOR, AND SHALL BE SPECIFICALLY RELEASED BY VALERO FROM
         AND AGAINST, ANY DAMAGES TO THE EXTENT THEY ARE CAUSED BY ANY FACT,
         CIRCUMSTANCE, ACTION, OMISSION, OR CONDITION OCCURRING OR EXISTING THAT
         (i) RELATES TO OR IS OTHERWISE ASSOCIATED WITH THE OPERATION,
         MAINTENANCE, OWNERSHIP, INSPECTION, TESTING, ALTERATION, REPLACEMENT,
         CHANGE IN SIZE OF, REPAIR, EXPANSION, TRANSITION, ENVIRONMENTAL
         REMEDIATION, OR MANAGEMENT OF THE SYSTEM PRIOR TO THE EFFECTIVE DATE OF
         THIS AGREEMENT, AND (ii) WAS CAUSED BY ANY ACT OR OMISSION OF VALERO,
         ANY VALERO INDEMNITEE, OR ANY PERSON OR ENTITY THAT OWNED OR OPERATED
         ANY PORTION OF THE SYSTEM PRIOR TO THE EFFECTIVE DATE OF THIS
         AGREEMENT.

6.3      INDEMNIFICATION BY CONTRACTORS. TO THE SAME EXTENT OPERATOR REQUIRES
         CONTRACTORS AND SUBCONTRACTORS TO INDEMNIFY OPERATOR WHILE PERFORMING
         WORK ON OR SERVICES FOR ITS OWN PIPELINE AND TERMINALING ASSETS,
         OPERATOR SHALL REQUIRE ALL CONTRACTORS AND SUBCONTRACTORS THAT WORK ON
         OR PROVIDE SERVICES FOR ANY PORTION OF THE SYSTEM (COLLECTIVELY, THE
         "OPERATOR'S CONTRACTORS") TO INDEMNIFY, DEFEND (UPON OPERATOR'S
         REQUEST), AND HOLD HARMLESS BOTH OPERATOR,

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         ITS EMPLOYEES AND ITS AFFILIATES, AND VALERO AND THE VALERO INDEMNITEES
         FROM AND AGAINST ALL DAMAGES TO THE EXTENT CAUSED BY THE NEGLIGENCE OR
         WILLFUL MISCONDUCT OF SUCH CONTRACTOR OR SUBCONTRACTOR, OR ONE OF THEIR
         RESPECTIVE EMPLOYEES AS DETERMINED BY EITHER MUTUAL AGREEMENT OF THE
         AFFECTED PARTIES OR A FINAL, NON-APPEALABLE JUDGMENT OF A JUDICIAL BODY
         HAVING PROPER JURISDICTION OVER THE SUBJECT MATTER IN QUESTION. .

                                    SECTION 7
                             PROPERTY ADMINISTRATION

7.1      Operator, in the name of and as agent for Valero, will perform all
         Property Administration (as hereinafter generally defined) necessary
         for the operation of the System. If Operator, in its sole discretion,
         determines that any part of the Property Administration can be
         performed more efficiently and economically by a contract agent,
         Operator may employ such contract agent and review such agent's work at
         any time and from time to time to ensure that the Property
         Administration is performed at a reasonable cost. "Property
         Administration" means the acquisition, maintenance and administration
         (including, but not limited to, the making of required payments) of all
         contracts and grants (including, but not limited to, right of way
         agreements, easements, leases, permits, and licenses) concerning
         Valero's rights to use or occupy the real property of other parties or
         rights granted to other parties (other than Operator or affiliates of
         Operator) to use Valero's real property.

                                    SECTION 8
                                     RECORDS

8.1      RECORDS. Valero shall remain responsible and liable for preparing,
         filing (where applicable), and maintaining any and all records,
         reports, data, manuals, policies, procedures or other materials of any
         kind, nature, or format that was required by applicable law, rule, or
         regulation for any period of time prior to the effective date of this
         Agreement. In the event Operator becomes aware of any records, reports,
         data, manuals, policies, procedures or other materials of any kind,
         nature, or format that were required by applicable law, rule, or
         regulation for any period of time prior to the effective date of this
         Agreement that have not been properly prepared, filed or maintained,
         Operator will promptly notify Valero of such fact. On a going forward
         basis after the effective date of this Agreement, Operator will prepare
         and preserve for and in the name of Valero a complete set of operating
         records in accordance with the system of accounts prescribed by the
         Federal Energy Regulatory Commission ("FERC"), and/or any other federal
         or state agency having regulatory jurisdiction over the System, or as
         may be reasonably required by Valero. Operator shall furnish all such
         information and reports

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         regarding the operation or maintenance of the System as might be
         reasonably required by Valero or by any federal or state agency having
         appropriate jurisdiction over the System. Operator shall provide Valero
         the opportunity to remove and retain a copy of such records at any time
         during the term of this Agreement or within a reasonable period of time
         thereafter.

8.2      PERIODIC REPORTS AND STATEMENTS. On a going forward basis, Operator and
         Valero will act diligently and in good faith to jointly prepare,
         review, and file with the appropriate regulatory agency, in the name of
         Valero, all reports required by applicable law in connection with
         environmental, health and safety matters, construction permits, and/or
         the ownership and operation of the System (collectively, the
         "Regulatory Reports"). Notwithstanding the foregoing, Valero shall be
         solely responsible and liable for preparing, reviewing, filing, and
         maintaining all Regulatory Reports that were either due to be filed or
         were based on the ownership or operation of the System prior to the
         effective time of this Agreement. Operator will promptly notify Valero
         of any deficiency in the preparation, filing or maintenance of such
         reports upon discovery thereof by Operator.

                                    SECTION 9
                              LAWS AND REGULATIONS

9.1      This Agreement is subject to all present and future valid orders,
         rules, and regulations of any regulatory body having proper
         jurisdiction over the ownership or operation of the System, and to the
         laws of the United States or any states having proper jurisdiction over
         the ownership or operation of the System; and in the event this
         Agreement or any provision hereof shall be found to be contrary to or
         in conflict with any such order, rule, regulation, or law, this
         Agreement shall be deemed modified to the extent necessary to comply
         with such order, rule, regulation, or law, but only for the period of
         time such order, rule, regulation or law is in effect.

                                       10
<Page>

                                   SECTION 10
                                  FORCE MAJEURE

10.1     To the extent that any Party is rendered unable, wholly or in part, by
         an event of force majeure (as hereinafter defined) to perform any of
         its obligations under this Agreement, it is agreed that such Party upon
         giving notice and full particulars of such event of force majeure
         (including its known or estimated duration) in writing, or by facsimile
         transmission or similar electronic transmission device to the other
         Parties, as soon as practicable after the occurrence of the cause
         relied on, shall be relieved of its obligations hereunder during the
         continuance of the cause of the event of force majeure, but for no
         longer period. Such Party shall not be liable to the other Parties for
         any losses or damages regardless of the nature thereof and however so
         occurring, whether such losses or damages be direct or indirect,
         immediate or remote, by reason of an event of force majeure. Such Party
         shall use commercially reasonable efforts to mitigate the effects of
         such event of force majeure. If an event of force majeure renders a
         Party unable, wholly or in part, to carry out its obligations under
         this Agreement, the Parties shall determine if any adjustments are
         necessary in the charges to be paid as set forth in Section 4 hereof
         during the period such Party is unable to perform because of the event
         of force majeure.

         The term "force majeure" as employed herein shall mean, cover, and
         include the following:

         (a)      Acts of God, including but not limited to, earthquakes,
                  landslides, floods, washouts, lightning, tornadoes, and
                  storms;

         (b)      Acts of Government including but not limited to, imposition of
                  laws, orders, rules, judgments, judicial actions, and
                  regulations when conformity thereto directly or indirectly
                  renders any Party unable to perform any of its obligations
                  under this Agreement;

         (c)      Acts of Civil Disorder, including but not limited to, acts of
                  sabotage, acts of the public enemy or terrorists, acts of war
                  (declared or undeclared), insurrections, riots, mass protests,
                  or demonstrations;

         (d)      Acts or Threats of Industrial Disorders, including but not
                  limited to, strikes, lockouts and picketing, when such acts or
                  threats of industrial disorder directly or indirectly render a
                  Party unable to perform its obligations under this Agreement;
                  provided, however, that the settlement of labor disputes to
                  prevent or end any such industrial disorder shall be entirely
                  within the discretion of such Party that is experiencing or
                  suffering under such disorder and the above requirement that
                  such Party use reasonable efforts to mitigate the effects of
                  an event of force majeure, shall not require settlement of
                  labor disputes by acceding to the demands

                                       11
<Page>

                  of the opposing party when such course is inadvisable in the
                  discretion of the adversely impacted Party;

         (e)      Shortages of product, equipment, and materials which are
                  beyond the reasonable control of such Party; and

         (f)      Any other cause (other than the ability to pay money) beyond
                  the reasonable control of such Party declaring force majeure.

                                   SECTION 11
                                 CONFIDENTIALITY

11.1     Operator agrees that any information which has been or shall be
         disclosed by Valero, directly or indirectly, to Operator, or developed
         by Operator, and in either case is supplied or generated in the course
         of performing services hereunder (collectively, "Confidential
         Information"), shall be maintained in confidence by Operator and shall
         be used by Operator only for the purposes of performing the services
         described herein. Except where required by applicable law, rule,
         regulation, order, judgment, or decree, Operator shall not disclose to
         others (other than to Valero or its affiliates or designees unless such
         disclosure is likewise restricted or prohibited by applicable law,
         rule, regulation, order, judgment, or decree), duplicate, or use in any
         manner, except as provided herein, all or any part of any Confidential
         Information. Operator shall limit access to such Confidential
         Information to those of Operator's employees, agents, contractors, or
         other representatives who reasonably require the same to carry out the
         purposes of this Agreement. No Confidential Information disclosed to
         Operator hereunder shall be passed on to or disclosed by Operator to
         any of its corporate affiliates (unless such information pertains
         solely to such affiliate) except with the prior written approval of
         Valero and the affected shipper on the System. Confidential Information
         shall not include any information which is acquired by Operator in the
         course of its activities outside of the scope of this Agreement or
         which becomes part of the public domain or literature without breach of
         this Agreement.

                                   SECTION 12
                     ACTIONS UPON TERMINATION OF OPERATIONS

12.1     RETURN OF SUPPLIES AND MATERIALS. Upon termination of this Agreement,
         Operator shall provide Valero the opportunity to remove and retain all
         operating supplies and materials purchased by Operator on Valero's
         behalf.

12.2     RETURN OF RECORDS. Upon termination of this Agreement, Operator shall
         deliver to Valero, at a location designated by Valero, all records,
         data, drawings, and information in Operator's custody that pertain to
         the System and the prior operation thereof.

                                       12
<Page>

                                   SECTION 13
                                     NOTICES

13.1     All notices or other communications required or permitted by this
         Agreement shall be sufficiently given if in writing (including telex,
         fax or telegram) and personally delivered or sent by operator telex or
         by registered or certified mail, return receipt requested, as follows:

                  To Valero, as follows:

                           Valero Pipeline Company
                           One Valero Place
                           San Antonio, TX  78212-3186
                           Attention:  Rick Bluntzer

                  With copy of all legal notices to:

                           Valero Energy Corporation
                           One Valero Place
                           San Antonio, TX  78212-3186
                           Attention:  Commercial Law Department

                  All copies of all invoices to:

                           Valero Energy Corporation
                           One Valero Place
                           San Antonio, TX  78212-3186
                           Attention:  Accounts Payable

                  To Operator, as follows:

                           Shamrock Logistics Operations, L.P.
                           6000 North Loop 1604 West
                           San Antonio, Texas 78249
                           Attention:  President

                  With a copy to:

                           Shamrock Logistics Operations, L.P.
                           6000 North Loop 1604 West
                           San Antonio, Texas 78249
                           Attention:  Legal Department

         or to such other address as hereafter shall be furnished as provided in
         this Section.

                                   SECTION 14

                                       13
<Page>

                             ENTIRETY OF AGREEMENTS

14.1     This Agreement, as well as the Lease and AFE policy, constitute the
         entire agreement between the Parties with respect to the operation,
         maintenance, and management of the System by Operator, and no
         modification or amendment hereto shall be binding upon either Party
         unless expressly agreed to in writing by all Parties.

                                   SECTION 15
                               FEDERAL COMPLIANCE

15.1     Insofar as applicable hereto, each Party hereto shall comply with
         Executive Order No. 11246, as amended, and the rules and regulations
         issued thereunder, to ensure that applicants are employed, and that
         employees are treated during employment without regard to their race,
         creed, color, sex or national origin. Also, if applicable, each Party
         hereto shall comply with all provisions of the Vietnam Era Veterans'
         Readjustment Assistance Act of 1974 and the rules and regulations
         issued thereunder, including 41 C.F.R., Chapter 60, Part 60-250. Each
         Party hereto shall also, if applicable, comply with all provisions of
         the Rehabilitation Act of 1973, and the rules and regulations issued
         thereunder including 41 C.F.R., Chapter 60, Part 60-740. All acts,
         orders, rules and regulations hereinafter referred to are hereby
         incorporated by reference unless this Agreement is excepted by
         appropriate Federal law, rules, regulations or orders.

                                   SECTION 16
                              CAPTIONS OR HEADINGS

16.1     The headings appearing at the beginning of each Section and at the
         beginning of various subsections are all inserted and included solely
         for convenience and shall never be considered or given any effect in
         construing this Agreement or any provisions hereof or liabilities of
         the respective parties or in ascertaining intent, if any question of
         intent should arise.

                                   SECTION 17
                                  ASSIGNABILITY

17.1     The rights, duties and privileges under this Agreement shall not be
         assigned by either Party without the prior written consent of the other
         Party.

                                   SECTION 18
                                  GOVERNING LAW

18.1     This Agreement shall be construed in accordance with, and governed by,
         the laws of the State of Texas without regard to the conflicts-of-laws
         rules of Texas.

                                       14
<Page>

                                   SECTION 19
                                     WAIVER

19.1     No waiver by either party of any default of the other Party under this
         Agreement shall operate as a waiver of any future default, whether of
         like or different character.

                                   SECTION 20
                     CLAIMS; ALTERNATIVE DISPUTE RESOLUTION

20.1     MEDIATION. If there is ever a controversy, dispute, and claim
         (collectively, "Claim") that arises out of, in connection with, or in
         relation to the interpretation, performance, nonperformance, validity
         or breach of this Agreement, or otherwise arising out of, or in any way
         related to, this Agreement, including any claim based in contract,
         tort, strict liability, statute, or constitution (collectively, a
         "Dispute"), the Party initiating the Claim or Dispute shall first give
         notice of the Claim or Dispute to the other Party. Executives (of each
         Party) having authority to settle such Claim or Dispute shall then meet
         and negotiate to resolve the Claim or Dispute. If such executives fail
         to meet or are unable to resolve all issues surrounding the Claim or
         Dispute in question within 30 days after the notice from the Party
         initiating the Claim or Dispute, the Parties shall endeavor to settle
         the matter by mediation. Each Party shall be liable for fifty percent
         (50%) of all costs and expense attributed to selecting and retaining a
         mediator. All other costs of the mediation shall be borne by the Party
         incurring such costs. If the Claim or Dispute has not been resolved by
         mediation within 60 days after the mediator has commenced such
         mediation, either Party shall be free to pursue arbitration as
         specified under Section 20.2, below

20.2     ARBITRATION. Any Claim or Dispute which could not be fully resolved
         under the provisions of Section 20.1, above, shall be determined by
         arbitration conducted in Houston, Texas, before and in accordance with
         the then-existing Rules for Complex Arbitration (the "Rules") of the
         American Arbitration Association (the "AAA"), and any judgment rendered
         by the arbitrators shall be final, binding and unappealable, and
         judgment may be entered by any state or Federal court having
         jurisdiction thereof. Valero and Operator shall each select one such
         arbitrator, and the two arbitrators so selected shall select the third
         arbitrator. Each arbitrator shall sign an oath agreeing to be bound by
         the Code of Ethics for Arbitrators in Commercial Disputes promulgated
         by the AAA for Neutral Arbitrators. It is the intent of the Parties to
         avoid the appearance of impropriety due to bias or partiality on the
         part of any arbitrator. Prior to each arbitrator's formal appointment,
         such arbitrator shall disclose to the Parties and the other arbitrators
         any financial, fiduciary, kinship or other relationship with any Party.
         For the purpose of this Section, "appearance of impropriety" shall be
         defined as such relationship or behavior as would cause a reasonable
         person to believe that bias or partiality on the part of the arbitrator
         may exist in favor of any Party. Any award or portion thereof, whether
         preliminary or final, shall be in a written opinion

                                       15
<Page>

         containing findings of fact and conclusions of law signed by each
         arbitrator. The arbitrators shall hear and determine any preliminary
         issue of law asserted by a Party to be dispositive of any claim or for
         summary judgment, pursuant to such terms and procedures as the
         arbitrators deem appropriate. It is the intent of the Parties that,
         barring extraordinary circumstances, any arbitration hearing shall be
         concluded within two months of the date the statement of claim is
         received by the AAA. The arbitrators shall use their best efforts to
         issue the final award or awards within a period of 30 days after
         closure of the proceedings. Failure to do so shall not be a basis for
         challenging the award. The Parties and the arbitrators shall treat all
         aspects of the arbitration proceedings, including discovery, testimony,
         and other evidence, briefs and the award, as strictly confidential. The
         Parties intend that the provisions to arbitrate set forth in this
         Section be valid, enforceable and irrevocable. In their award, the
         arbitrators shall allocate, in their discretion, among the parties to
         the arbitration all costs of the arbitration, including the fees and
         expenses of the arbitrators and reasonable attorneys' fees, costs and
         expert witness expense of the Parties. In addition, the arbitrators
         shall be entitled, if appropriate, to award (i) only actual monetary or
         compensatory damages or (ii) specific performance as called for under
         the terms of this Agreement. The undersigned agree to comply with any
         award made in any such arbitration proceedings that has become final in
         accordance with the Rules and agree to the entry of a judgment in any
         jurisdiction upon any award rendered in such proceedings becoming final
         under the Rules.

IN WITNESS WHEREOF, the parties have executed this agreement effective as of the
date first written above.

                                       SHAMROCK LOGISTICS OPERATIONS, L.P.

                                          By and through its General Partner,
                                          Riverwalk Logistics, G.P.

                                             By and Through its General Partner,
                                             Shamrock Logistics GP, L.L.C.

                                       By:/s/ Curtis V. Anastasio
                                          --------------------------------------
                                              Curtis V. Anastasio,
                                              President

                                       16
<Page>

                                       VALERO PIPELINE COMPANY

                                       By:/s/ J. R. Bluntzer
                                          --------------------------------------
                                       Name:  J.R. Bluntzer
                                       Title: Vice President

                                       17

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