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1 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D UNDER THE SECURITIES EXCHANGE ACT OF 1934 Shamrock Logistics, L.P. - -------------------------------------------------------------------------------- (Name of Issuer) Common Units - -------------------------------------------------------------------------------- (Title of Class of Securities) 819357 10 4 ---------------------------------------------- (CUSIP Number) Curtis V. Anastasio President and Chief Executive Officer 6000 North Loop 1604 West San Antonio, Texas 78249 (210) 592-2000 - -------------------------------------------------------------------------------- (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) April 16, 2001 ---------------------------------------------- (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 Rule 13d-1(e), Rule 13d-1(f) or Rule 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 Rule 13d-7(b) 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).

2 SCHEDULE 13D - ---------------------- ------------------ CUSIP NO. 819357 10 4 PAGE 2 OF 24 PAGES - ---------------------- ------------------ - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Ultramar Diamond Shamrock Corporation - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS* OO; see Item 3 - -------------------------------------------------------------------------------- 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 - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER 4,424,322 Common Units of Shamrock Logistics, L.P. NUMBER OF ------------------------------------------------------------- SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY -0- EACH ------------------------------------------------------------- REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH 4,424,322 Common Units of Shamrock Logistics, L.P. ------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,424,322 Common Units of Shamrock Logistics, 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) 46.1% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON HC, CO - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT!

3 SCHEDULE 13D - ---------------------- ------------------ CUSIP NO. 819357 10 4 PAGE 3 OF 24 PAGES - ---------------------- ------------------ - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON TPI Petroleum, Inc. - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS* OO; see Item 3 - -------------------------------------------------------------------------------- 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 - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER -0- NUMBER OF ------------------------------------------------------------- SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY 4,424,322 Common Units of Shamrock Logistics, L.P. EACH ------------------------------------------------------------- REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH -0- ------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 4,424,322 Common Units of Shamrock Logistics, L.P. - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,424,322 Common Units of Shamrock Logistics, 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) 46.1% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON HC, CO - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT!

4 SCHEDULE 13D - ---------------------- ------------------ CUSIP NO. 819357 10 4 PAGE 4 OF 24 PAGES - ---------------------- ------------------ - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Diamond Shamrock Refining and Marketing Company - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS* OO; see Item 3 - -------------------------------------------------------------------------------- 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 - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER -0- NUMBER OF ------------------------------------------------------------- SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY 4,424,322 Common Units of Shamrock Logistics, L.P. EACH ------------------------------------------------------------- REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH -0- ------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 4,424,322 Common Units of Shamrock Logistics, L.P. - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,424,322 Common Units of Shamrock Logistics, 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) 46.1% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON HC, CO - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT!

5 SCHEDULE 13D - ---------------------- ------------------ CUSIP NO. 819357 10 4 PAGE 5 OF 24 PAGES - ---------------------- ------------------ - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Sigmor Corporation - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS* OO; see Item 3 - -------------------------------------------------------------------------------- 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 - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER -0- NUMBER OF ------------------------------------------------------------- SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY 4,424,322 Common Units of Shamrock Logistics, L.P. EACH ------------------------------------------------------------- REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH -0- ------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 4,424,322 Common Units of Shamrock Logistics, L.P. - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,424,322 Common Units of Shamrock Logistics, 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) 46.1% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON HC, CO - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT!

6 SCHEDULE 13D - ---------------------- ------------------ CUSIP NO. 819357 10 4 PAGE 6 OF 24 PAGES - ---------------------- ------------------ - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON The Shamrock Pipe Line Corporation - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS* OO; see Item 3 - -------------------------------------------------------------------------------- 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 - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER -0- NUMBER OF ------------------------------------------------------------- SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY 4,424,322 Common Units of Shamrock Logistics, L.P. EACH ------------------------------------------------------------- REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH -0- ------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 4,424,322 Common Units of Shamrock Logistics, L.P. - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,424,322 Common Units of Shamrock Logistics, 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) 46.1% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON HC, CO - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT!

7 SCHEDULE 13D - ---------------------- ------------------ CUSIP NO. 819357 10 4 PAGE 7 OF 24 PAGES - ---------------------- ------------------ - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Diamond Shamrock Refining Company, L.P. - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS* OO; see Item 3 - -------------------------------------------------------------------------------- 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 - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER -0- NUMBER OF ------------------------------------------------------------- SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY 4,424,322 Common Units of Shamrock Logistics, L.P. EACH ------------------------------------------------------------- REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH -0- ------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 4,424,322 Common Units of Shamrock Logistics, L.P. - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,424,322 Common Units of Shamrock Logistics, 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) 46.1% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON HC, PN - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT!

8 SCHEDULE 13D - ---------------------- ------------------ CUSIP NO. 819357 10 4 PAGE 8 OF 24 PAGES - ---------------------- ------------------ - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON TPI Pipeline Corporation - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS* OO; see Item 3 - -------------------------------------------------------------------------------- 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 - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER -0- NUMBER OF ------------------------------------------------------------- SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY 4,424,322 Common Units of Shamrock Logistics, L.P. EACH ------------------------------------------------------------- REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH -0- ------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 4,424,322 Common Units of Shamrock Logistics, L.P. - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,424,322 Common Units of Shamrock Logistics, 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) 46.1% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON HC, CO - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT!

9 SCHEDULE 13D - ---------------------- ------------------ CUSIP NO. 819357 10 4 PAGE 9 OF 24 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; see Item 3 - -------------------------------------------------------------------------------- 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 - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER -0- NUMBER OF ------------------------------------------------------------- SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY 4,424,322 Common Units of Shamrock Logistics, L.P. EACH ------------------------------------------------------------- REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH -0- ------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 4,424,322 Common Units of Shamrock Logistics, L.P. - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,424,322 Common Units of Shamrock Logistics, 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) 46.1% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON HC, limited liability company - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT!

10 PAGE 10 OF 24 PAGES ORIGINAL REPORT ON SCHEDULE 13D Item 1. Security and Issuer This statement on Schedule 13D is being filed by Ultramar Diamond Shamrock Corporation, TPI Petroleum, Inc., TPI Pipeline Corporation, Diamond Shamrock Refining and Marketing Company, Sigmor Corporation, The Shamrock Pipe Line Corporation, Diamond Shamrock Refining Company, L.P. and UDS Logistics, LLC (collectively, the "Reporting Persons"). This statement relates to the common units representing limited partner interests (the "Common Units") of Shamrock Logistics, L.P., a Delaware limited partnership (the "Partnership"), which has its principal executive offices at 6000 North Loop 1604 West, San Antonio, Texas 78249-1112. Item 2. Identity and Background (a) - (b) The information required to be filed in response to paragraphs (a) and (b) of Item 2 with respect to the Reporting Persons is set forth on Schedule I. (c) The information required to be filed in response to paragraph (c) of Item 2 with respect to the Reporting Persons is as follows: 1. Ultramar Diamond Shamrock Corporation ("UDS") is principally engaged in the refining and retailing of high-quality refined products and convenience store merchandise. The executive officers and directors of Ultramar Diamond Shamrock Corporation are listed on Appendix A hereto. UDS holds the 4,424,322 Common Units, representing a 46.1% ownership interest in the Partnership, through UDS Logistics, LLC, its indirect wholly owned subsidiary. UDS is the direct owner of 100% of each of Diamond Shamrock Refining and Marketing Company ("DSRMC") and TPI Petroleum Inc. DSRMC holds a 45.023544% member interest in UDS Logistics, LLC. DSRMC also is the owner of 100% of each of Diamond Shamrock Refining Company, L.P. (through DSRMC's subsidiaries Sigmor Corporation and D-S Venture Company, LLC), Sigmor Corporation and The Shamrock Pipe Line Corporation, each of which holds a 5.414771%, 29.498522% and 13.544178% member interest in UDS Logistics, LLC, respectively. The remaining 6.518985% member interests in UDS Logistics, LLC is held by TPI Pipeline Corporation, a direct wholly owned subsidiary of TPI Petroleum Inc. As a result, UDS and each of the following direct and indirect subsidiaries of UDS, DSRMC, TPI Petroleum, Inc., TPI Pipeline Corporation, Sigmor Corporation, The Shamrock Pipe Line Corporation, and Diamond Shamrock Refining Company, L.P., may be deemed to beneficially own the Common Units acquired by UDS Logistics. 2. TPI Petroleum, Inc. is the direct owner of 100% of TPI Pipeline Corporation and is principally engaged in the refining and marketing of petroleum products. The executive officers and directors of TPI Petroleum, Inc. are listed on Appendix B hereto. 3. DSRMC is the direct owner of 45.023544% of the member interests of UDS Logistics, LLC, 100% of each of Sigmor Corporation, The Shamrock Pipe Line Corporation and Diamond Shamrock Refining Company, L.P. and is principally engaged in the refining and marketing of petroleum products. The executive officers and directors of DSRMC are listed on Appendix C hereto.

11 PAGE 11 OF 24 PAGES 4. Sigmor Corporation owns 29.498522% of the member interests of UDS Logistics, LLC and is principally engaged in the ownership and leasing of real estate. The executive officers and directors of Sigmor Corporation are listed on Appendix D hereto. 5. The Shamrock Pipe Line Corporation owns 13.544178% of the member interests of UDS Logistics, LLC and is primarily engaged in the ownership and operation of pipelines. The executive officers and directors of The Shamrock Pipe Line Corporation are listed on Appendix E hereto. 6. Diamond Shamrock Refining Company, L.P. owns 5.414771% of the member interests of UDS Logistics, LLC and is primarily engaged in the ownership and operation of refineries and pipelines. 7. TPI Pipeline Corporation owns 6.518985% of the member interests of UDS Logistics, LLC and is primarily engaged in the ownership and operation of pipelines. The executive officers and directors of TPI Pipeline Corporation are listed on Appendix F hereto. 8. UDS Logistics, LLC is the limited partner of Riverwalk Logistics, L.P., the general partner of the Partnership, and its sole purpose is to hold (i) the limited partner interest in Riverwalk Logistics and (ii) Common Units and the subordinated units of the Partnership. (d) During the last five years, none of the Reporting Persons have been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors). (e) During the last five years, none of the Reporting Persons have been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction as a result of which any of such persons was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws. (f) The information required to be filed in response to paragraph (f) of Item 2 with respect to the Reporting Persons is set forth on Schedule I. Item 3. Source and Amount of Funds or Other Consideration The Reporting Persons acquired beneficial ownership of 4,424,322 Common Units on April 16, 2001 in exchange for the contribution of an equity interest in an affiliated entity of the Partnership in connection with the Partnership's initial public offering. Item 4. Purpose of Transaction The Reporting Persons acquired the Common Units reported herein solely for the purpose of investment. The Reporting Persons may make additional purchases of Common Units either in the open market or in private transactions depending on the Partnership's business, prospects and financial condition, the market for the Common Units, general economic conditions, money and stock market conditions and other future developments.

12 PAGE 12 OF 24 PAGES Item 5. Interest in Securities of the Company (a) There were 9,599,322 Common Units outstanding as of April 16, 2001, the date of the initial public offering. The Reporting Persons are deemed to be the beneficial owners of 4,424,322 Common Units, which constitute approximately 46.1% of the total issued and outstanding Common Units as of April 24, 2001. The Reporting Persons also hold, through UDS Logistics, LLC, 9,599,322 subordinated limited partner interests in the Partnership, which may be converted, generally not before March 31, 2006, into an equal number of Common Units upon satisfaction of the conditions described in the Registration Statement on Form S-1 (No. 333-43668 and No. 333-58588), incorporated herein by reference. (b) The number of Common Units as to which there is sole power to vote or to direct the vote, sole power to dispose or to direct the disposition, or shared power to dispose or direct the disposition for the Reporting Persons is set forth on the cover page of this Statement on Schedule 13D, and such information is incorporated herein by reference. (c) There have been no reportable transactions with respect to the Common Units within the last 60 days by the Reporting Persons except for the acquisition of beneficial ownership of units being reported on this Schedule 13D. (d) The Reporting Persons have the right to receive distributions from, and the proceeds from the sale of, the respective Common Units reported by such persons on the cover pages of this Statement on Schedule 13D. (e) Not applicable. Item 6. Contracts, Arrangements, Understandings or Relationships with respect to Securities of the Company The 4,424,322 Common Units acquired by the Reporting Persons were acquired in a private placement and are restricted securities. Certain transfer restrictions, voting rights of the Reporting Persons and registration rights granted by the Partnership and to which the Partnership is entitled are set forth in the Second Amended and Restated Agreement of Limited Partnership of the Partnership, a copy of the form of which is included as Appendix A to the Registration Statement on Form S-1 which has been incorporated by reference to this Schedule 13D. Item 7. Material to be filed as Exhibits Exhibit A: Registration Statement on Form S-1 for Shamrock Logistics, L.P. (333-43668) incorporated herein by reference. Exhibit B: Registration Statement on Form S-1 for Shamrock Logistics, L.P. (333-58588) incorporated herein by reference. Exhibit C: Joint Filing Agreement, dated April 26, 2001.

13 PAGE 13 OF 24 PAGES 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: April 26, 2001 ULTRAMAR DIAMOND SHAMROCK CORPORATION /s/ William R. Klesse ----------------------------------------------- Name: William R. Klesse Title: Executive Vice President, Operations TPI PETROLEUM, INC. /s/ C. V. Anastasio ----------------------------------------------- Name: C. V. Anastasio Title: Vice President DIAMOND SHAMROCK REFINING AND MARKETING COMPANY /s/ C. V. Anastasio ----------------------------------------------- Name: C. V. Anastasio Title: Vice President SIGMOR CORPORATION /s/ Steve Blank ----------------------------------------------- Name: Steve Blank Title: Vice President and Treasurer THE SHAMROCK PIPE LINE CORPORATION /s/ C. V. Anastasio ----------------------------------------------- Name: C. V. Anastasio Title: President

14 PAGE 14 OF 24 PAGES DIAMOND SHAMROCK REFINING COMPANY, L.P. /s/ Steve Blank ----------------------------------------------- Name: Steve Blank Title: Vice President and Treasurer TPI PIPELINE CORPORATION /s/ C. V. Anastasio ----------------------------------------------- Name: C. V. Anastasio Title: President UDS LOGISTICS, LLC /s/ Raymond Gaddy ----------------------------------------------- Name: Raymond Gaddy Title: President

15 PAGE 15 OF 24 PAGES SCHEDULE I STATE OF NAME INCORPORATION BUSINESS ADDRESS ---- ------------- ---------------- Ultramar Diamond Shamrock Delaware 6000 North Loop 1604 West Corporation San Antonio, Texas 78249-1112 TPI Petroleum, Inc. Michigan P.O. Box 696000 San Antonio, Texas 78269-6000 Diamond Shamrock Refining and Delaware P.O. Box 696000 Marketing Company San Antonio, Texas 78269-6000 Sigmor Corporation Delaware P.O. Box 696000 San Antonio, Texas 78269-6000 The Shamrock Pipe Line Corporation Delaware P.O. Box 696000 San Antonio, Texas 78269-6000 Diamond Shamrock Refining Delaware P.O. Box 696000 Company, L.P. San Antonio, Texas 78269-6000 TPI Pipeline Corporation Michigan P.O. Box 696000 San Antonio, Texas 78269-6000 UDS Logistics, LLC Delaware 5801 Osuna Road, NE Suite A-102 Albuquerque, NM 87109-2587

16 PAGE 16 OF 24 PAGES APPENDIX A Executive Officers and Directors of Ultramar Diamond Shamrock Corporation Jean R. Gaulin President, Chief Executive Officer and Director (Chairman) W. Paul Eisman Executive Vice President - Corporate Development Timothy J. Fretthold Executive Vice President and Chief Administrative and Legal Officer Christopher L. Havens Executive Vice President - Marketing and Retail Operations William R. Klesse Executive Vice President - Operations Robert S. Shapard Executive Vice President and Chief Financial Officer Byron Allumbaugh Director E. Glenn Biggs Director W. E. Bradford Director H. Frederick Christie Director W. H. Clark Director Russel H. Herman Director Bob Marbut Director Katherine D. Ortega Director Madeleine Saint-Jacques Director C. Barry Schaefer Director Each of the foregoing persons is a United States citizen with the exception of Ms. Saint-Jacques, who is a Canadian citizen. The principal business address of Messrs. Gaulin, Eisman, Fretthold, Havens, Klesse and Shapard is 6000 North Loop 1604 West, San Antonio, Texas 78249-1112, and the present principal occupation or employment of each such person is serving as an employee of Ultramar Diamond Shamrock Corporation. The business address of Messrs. Bradford, Christie, Allumbaugh and Herman and Ms. Ortega is 6000 North Loop 1604 West, San Antonio, Texas 78249-1112. Each such person is retired. The principal business address of E. Glenn Biggs is 1250 N.E. Loop 410, Suite 333, San Antonio, TX 78209, and his present principal occupation or employment is serving as President of Biggs & Co., a corporation engaged in developmental projects and financial planning. The principal business address of W. H. Clark is 20 South Clark Street, Suite 2222, Two First National Plaza, Chicago, IL 60603, and his present principal occupation or employment is serving as President of W. "H" Clark Associates, Ltd., a business engaged in investment activities.

17 PAGE 17 OF 24 PAGES The principal business address of Bob Marbut is 888 Seventh Avenue, 27th Floor, New York, NY 10106, and his present principal occupation or employment is serving as Chairman and Chief Executive Officer of Argyle Communications, Inc. and Chairman of Hearst-Argyle Television, Inc., corporations engaged in broadcasting and publishing. The principal business address of Madeleine Saint-Jacques is 1600 Rene-Levesque West, Suite 1200, Montreal, Quebec H3H 1P9 Canada, and her present principal occupation or employment is serving as Chairman of the Board of Saint-Jacques Vallee Young and Rubicam Inc., a corporation engaged in advertising. The principal business address of C. Barry Schaefer is 399 Park Avenue, 18th Floor, New York, NY 10022, and his present principal occupation or employment is serving as Managing Director of The Bridgeford Group, an investment banking concern and President of C.B. Schaefer and Company, Inc., a financial advisory firm.

18 PAGE 18 OF 24 PAGES APPENDIX B Executive Officers and Directors of TPI Petroleum, Inc. NAME OFFICE ---- ------ Jean R. Gaulin Chief Executive Officer and President Timothy J. Fretthold Executive Vice President, Chief Administrative and Legal Officer and Director William R. Klesse Executive Vice President and Director Robert S. Shapard Executive Vice President, Chief Financial Officer and Director Christopher L. Havens Executive Vice President W. Paul Eisman Executive Vice President Robert S. Beadle Senior Vice President Stephan Motz Senior Vice President Doris Beaulieu Vice President and Chief Information Officer Curtis V. Anastasio Vice President Anthony P. Bartys Vice President Steven A. Blank Vice President and Treasurer K.K. Eaton Vice President John Emley Vice President Robert E. Kerns Vice President W. Rudd Marlowe Vice President Jerry D. McVicker Vice President Thomas M. O'Brien Vice President and Controller Charles Patry Vice President Michael D. Thompson Vice President L. Don Thurmond Vice President Penelope R. Viteo Vice President Harold D. Mallory Secretary Patrick D. Furlong Assistant Controller Ron Mechler Assistant Controller Warren Andrew Peters Assistant Controller Cheryl K. Trevor Assistant Secretary and Assistant Controller Claudine Ton Nu Assistant Secretary Daniel F. Frye, III Assistant Treasurer Margaret J. Gowans Assistant Treasurer Patti K. Meisetschleager Assistant Treasurer Each of the foregoing persons is a United States citizen with the exception of Messrs. Beaulieu, Motz, Patry and Thompson, who are Canadian citizens. The principal business address of each such persons is P.O. Box 696000, San Antonio, Texas 78269-6000, and the present principal occupation or employment of each such person is their position or positions as an executive officer and/or director of TPI Petroleum, Inc. and, if applicable, other affiliates of Ultramar Diamond Shamrock Corporation.

19 PAGE 19 OF 24 PAGES APPENDIX C Executive Officers and Directors of Diamond Shamrock Refining and Marketing Company NAME OFFICE ---- ------ Jean R. Gaulin Chief Executive Officer and President Timothy J. Fretthold Executive Vice President, Chief Administrative and Legal Officer and Director William R. Klesse Executive Vice President and Director Robert S. Shapard Executive Vice President, Chief Financial Officer and Director Christopher L. Havens Executive Vice President W. Paul Eisman Executive Vice President Robert S. Beadle Senior Vice President Stephan Motz Senior Vice President Curtis V. Anastasio Vice President Anthony P. Bartys Vice President Steven A. Blank Vice President and Treasurer Richard Boucher Vice President K.K. Eaton Vice President Robert E. Kerns Vice President W. Rudd Marlowe Vice President Jerry D. McVicker Vice President Thomas M. O'Brien Vice President and Controller Michael D. Thompson Vice President L. Don Thurmond Vice President Penelope R. Viteo Vice President Harold D. Mallory Secretary Rene Noel Controller Marcel Dupuis Controller Ron Mechler Assistant Controller Warren Andrew Peters Assistant Controller Cheryl K. Trevor Assistant Secretary and Assistant Controller Claudine Ton Nu Assistant Secretary Daniel F. Frye, III Assistant Treasurer Margaret J. Gowans Assistant Treasurer Patti K. Meisetschleager Assistant Treasurer Each of the foregoing persons is a United States citizen with the exception of Messrs. Motz, Boucher, Thompson, Noel and Dupuis, who are Canadian citizens. The principal business address of each such persons is P.O. Box 696000, San Antonio, Texas 78269-6000, and the present principal occupation or employment of each such person is their position or positions as an executive officer and/or director of Diamond Shamrock Refining and Marketing Company and, if applicable, other affiliates of Ultramar Diamond Shamrock Corporation.

20 PAGE 20 OF 24 PAGES APPENDIX D Executive Officers and Directors of Sigmor Corporation NAME OFFICE ---- ------ Jean R. Gaulin Chief Executive Officer and President Timothy J. Fretthold Executive Vice President, Chief Administrative and Legal Officer and Director William R. Klesse Executive Vice President and Director Christopher L. Havens Executive Vice President W. Paul Eisman Executive Vice President Robert S. Shapard Executive Vice President, Chief Financial Officer and Director Robert S. Beadle Senior Vice President Stephan Motz Senior Vice President Steven Blank Vice President and Treasurer Anthony P. Bartys Vice President K.K. Eaton Vice President Michael D. Thompson Vice President Penelope R. Viteo Vice President Thomas M. O'Brien Vice President and Controller Todd Walker Secretary Cheryl K. Trevor Assistant Controller and Assistant Secretary Claudine Ton Nu Assistant Secretary Each of the foregoing persons is a United States citizen with the exception of Messrs. Motz and Thompson, who are Canadian citizens. The principal business address of each such persons is P.O. Box 696000, San Antonio, Texas 78269-6000, and the present principal occupation or employment of each such person is their position or positions as an executive officer and/or director of Sigmor Corporation and, if applicable, other affiliates of Ultramar Diamond Shamrock Corporation.

21 PAGE 21 OF 24 PAGES APPENDIX E Executive Officers and Directors of The Shamrock Pipe Line Corporation NAME OFFICE ---- ------ Curtis V. Anastasio President Steven A. Blank Vice President and Treasurer William R. Klesse Executive Vice President and Director Rodney L. Reese Vice President Ronald C. McInturff Vice President Thomas M. O'Brien Vice President and Controller Todd Walker Secretary Daniel F. Frye, III Assistant Treasurer and Assistant Secretary Patti K. Meisetschleager Assistant Treasurer Robert L. Blaylock Assistant Controller and Assistant Secretary Cheryl K. Trevor Assistant Controller and Assistant Secretary Margaret J. Gowans Assistant Secretary and Assistant Treasurer Dane Williams Assistant Secretary Claudine Ton Nu Assistant Secretary Timothy J. Fretthold Director Robert S. Shapard Director Each of the foregoing persons is a United States citizen. The principal business address of each such persons is P.O. Box 696000, San Antonio, Texas 78269-6000, and the present principal occupation or employment of each such person is their position or positions as an executive officer and/or director of The Shamrock Pipe Line Corporation and, if applicable, other affiliates of Ultramar Diamond Shamrock Corporation.

22 PAGE 22 OF 24 PAGES APPENDIX F Executive Officers and Directors of TPI Pipeline Corporation NAME OFFICE ---- ------ Curtis V. Anastasio President Steven A. Blank Vice President and Treasurer William R. Klesse Executive Vice President and Director R.S. Beadle Senior Vice President Rodney L. Reese Vice President Ronald C. McInturff Vice President Thomas M. O'Brien Vice President and Controller Todd Walker Secretary Daniel F. Frye, III Assistant Treasurer and Assistant Secretary Patti K. Meisetschleager Assistant Treasurer Cheryl K. Trevor Assistant Controller and Assistant Secretary Margaret J. Gowans Assistant Secretary and Assistant Treasurer Dane Williams Assistant Secretary Claudine Ton Nu Assistant Secretary Timothy J. Fretthold Director Robert S. Shapard Director Each of the foregoing persons is a United States citizen. The principal business address of each such persons is P.O. Box 696000, San Antonio, Texas 78269-6000, and the present principal occupation or employment of each such person is their position or positions as an executive officer and/or director of TPI Pipeline Corporation and, if applicable, other affiliates of Ultramar Diamond Shamrock Corporation.

23 EXHIBIT INDEX Ex. No. Description of Exhibit - ------- ---------------------- 99.c Joint Filing Agreement

1 PAGE 23 OF 24 PAGES EXHIBIT C JOINT FILING AGREEMENT Each of the undersigned agrees that (i) the statement on Schedule 13D relating to the Common Units representing limited partner interests in Shamrock Logistics, L.P., has been adopted and filed on behalf of each of them, (ii) all future amendments to such statement on Schedule 13D will, unless written notice to the contrary is delivered as described below, be jointly filed on behalf of each of them, and (iii) the provisions of Rule 13d-1 (k) (1) under the Securities Exchange Act of 1934 apply to each of them. This agreement may be terminated with respect to the obligations to jointly file future amendments to such statement on Schedule 13D as to any of the undersigned upon such person giving written notice thereof to each of the other persons signature hereto, at the principal office thereof. This Agreement may be executed in any number of counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument. Date: April 26, 2001 ULTRAMAR DIAMOND SHAMROCK CORPORATION /s/ WILLIAM R. KLESSE --------------------------------------------- Name: William R. Klesse Title: Executive Vice President, Operations TPI PETROLEUM, INC. /s/ C.V. ANASTASIO --------------------------------------------- Name: C.V. Anastasio Title: Vice President DIAMOND SHAMROCK REFINING AND MARKETING COMPANY /s/ C.V. ANASTASIO --------------------------------------- Name: C.V. Anastasio Title: Vice President SIGMOR CORPORATION /s/ STEVE BLANK --------------------------------------- Name: Steve Blank Title: Vice President and Treasurer

2 PAGE 24 OF 24 PAGES THE SHAMROCK PIPE LINE CORPORATION /s/ C.V. ANASTASIO --------------------------------------- Name: C.V. Anastasio Title: President DIAMOND SHAMROCK REFINING COMPANY, L.P. /s/ STEVE BLANK --------------------------------------- Name: Steve Blank Title: Vice President and Treasurer TPI PIPELINE CORPORATION /s/ C.V. ANASTASIO --------------------------------------- Name: C.V. Anastasio Title: President UDS LOGISTICS, LLC /s/ RAYMOND GADDY --------------------------------------- Name: Raymond Gaddy Title: President