EXHIBIT 21
ULTRAMAR DIAMOND SHAMROCK CORPORATION
SUBSIDIARIES
SUBSIDIARY STATE OF INCORPORATION
3007152 Nova Scotia Company Canada
3070336 Canada Inc. Canada
585043 Ontario Limited Canada
Arkansas Central, Inc. Arkansas
Arkansas LR, Inc. Arkansas
Arkansas NE, Inc. Arkansas
Arkansas NW, Inc. Arkansas
Arkansas SE, Inc. Arkansas
Arkansas SW, Inc. Arkansas
Autotronic Systems, Inc. Delaware
Barinco Insurance Ltd. Bermuda
Belvex, Inc. Texas
Big Diamond Number 1, Inc. Texas
Big Diamond, Inc. Texas
Bioremetec Inc. Canada
Canadian Marine Response Management Canada
Corporation Ltd.
Canadian Ultramar Company Canada
Canadian Ultramar Holding Corp. Delaware
Colonnade Assurance Limited Bermuda
Colonnade Vermont Insurance Company Vermont
Colorado Refining Company Colorado
Corporate Claims Management, Inc. Texas
Cush-Po, Inc. Oklahoma
D-S Mont Belvieu, Inc. Texas
D-S Splitter, Inc. Delaware
D-S Systems, Inc. Delaware
D-S United, Inc. Delaware
D-S Venture Company, L.l.c. Delaware
D-S World Energy, Inc. Delaware
D. S. E. Pipeline Company Delaware
Diamond Reforming, Inc. Delaware
Diamond Security Systems, Inc. Delaware
Diamond Shamrock Arizona, Inc. Delaware
Diamond Shamrock Boliviana, Ltd. California
Diamond Shamrock Leasing, Inc. Delaware
Diamond Shamrock of Bolivia, Inc. Delaware
Diamond Shamrock Pipeline Company Delaware
Diamond Shamrock Refining and Delaware
Marketing Company
Diamond Shamrock Refining Company, Delaware
L.P.
Diamond Shamrock Stations, Inc. Delaware
Dsrm National Bank N/A
Eastern Canada Response Corporation Canada
Ltd.
Emerald Corporation Delaware
Emerald Marketing, Inc. Texas
Emerald Pipe Line Corporation Delaware
Geo Williamson Fuels Ltd. Canada
Hanover Petroleum Corporation Delaware
Integrated Product Systems, Inc. Delaware
Kempco Petroleum Company Texas
Laurelglen Holdings, Inc. Delaware
Les Carburants Ultra-GNV ENR. Canada
Les Petroles D. Kirouac Inc. Canada
Metro Oil Co. Michigan
National Convenience Stores Delaware
Incorporated
National Money Orders Incorporated Texas
Navajo Sales Company, Inc. Arizona
Oceanic Tankers Agency Limited Canada
Petro/chem Environmental Services, Delaware
Inc.
Phoebus Energy Ltd. Bermuda
Robinson Oil Company (1987) Limited Canada
Sallans Fuels Limited Canada
Schepps Food Stores, Inc. Texas
Sea Eagle Insurance Company Hawaii
Shamrock Ventures, Ltd. Bermuda
Sigmor Beverage, Inc. Texas
Sigmor Corporation Delaware
Sigmor Pipeline Company Texas
Skelly-Belvieu Pipeline Company, Delaware
L.L.C.
Skipper Beverage Company, Inc. Texas
Stop'n Go Markets of Georgia, Inc. Georgia
Stop'n Go Markets of Texas, Inc. Texas
Sunshine Beverage Co. Texas
Texas Super Duper Markets, Inc. Texas
The Shamrock Pipe Line Corporation Delaware
TOC-DS Company Delaware
Total Engineering & Research Company Colorado
Total Petroleum, Inc. Michigan
Total Pipeline Corporation Michigan
UDS Capital I Delaware
UDS Capital II Delaware
UDS Corporation Delaware
UDS Funding I, L.P. Delaware
UDS Funding II, L.P. Delaware
Ultramar Acceptance Inc. Canada
Ultramar Credit Corporation Canada
Ultramar D.S., Inc. Texas
Ultramar Energy Inc. Delaware
Ultramar Inc. Nevada
Ultramar Ltee / Ultramar Ltd. Canada
Ultramar Services Inc. Canada
West Emerald Pipe Line Corporation Delaware
Xcel Products Company, Inc. Texas
Xral Storage and Terminaling Company Texas
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