ULTRAMAR DIAMOND SHAMROCK CORP
11-K, 1999-06-28
PETROLEUM REFINING
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549



                                    FORM 11-K



         [X] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES
                              EXCHANGE ACT OF 1934

For the year ended December 31, 1998


                                       OR


       [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES
                              EXCHANGE ACT OF 1934

For the transition period from __________ to __________.



                        Commission File Number 333-27701



                    A. UDS 401(k) Retirement Savings Plan

                    B. Ultramar Diamond Shamrock Corporation
                       6000 North Loop 1604
                       San Antonio, TX 78249-1112

<PAGE>


                       UDS 401(k) RETIREMENT SAVINGS PLAN
            Index to Financial Statements and Supplemental Schedules
                           December 31, 1998 and 1997


                                                                           Page

Report of Independent Public Accountants..................................    3

Financial Statements:

  Statement of Net Assets Available for Plan Benefits with Fund
    Information as of December 31, 1998...................................    4

  Statement of Net Assets Available for Plan Benefits with Fund
    Information as of December 31, 1997...................................    7

  Statement of Changes in Net Assets Available for Plan Benefits with
    Fund Information for the Year Ended December 31, 1998.................    9

  Notes to Financial Statements...........................................   15

Supplemental Schedules:

  Schedule I - Line 27a - Schedule of Assets Held for Investment
    Purposes as of December 31, 1998......................................   23

  Schedule II - Line 27b - Schedule of Loans or Fixed Income
    Obligations as of December 31, 1998....................................  24

  Schedule III - Line 27d - Schedule of Reportable Transactions
    for the Year Ended December 31, 1998..................................   25

  Schedule IV - Line 27e - Schedule of Nonexempt Transactions
    for the Year Ended December 31, 1998..................................   29

Signature.................................................................   30

Consent of Independent Public Accountants.................................   31

<PAGE>

                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS


To the Employee Benefits Committee of the
UDS 401(k) Retirement Savings Plan:

We have audited the  accompanying  statements  of net assets  available for plan
benefits with fund  information of the UDS 401(k)  Retirement  Savings Plan (the
Plan) as of December 31, 1998 and 1997, and the related  statement of changes in
net assets  available for plan benefits with fund information for the year ended
December 31, 1998.  These  financial  statements  and the schedules  referred to
below are the responsibility of the Plan's management.  Our responsibility is to
express an opinion on these  financial  statements  and  schedules  based on our
audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion,  the financial  statements  referred to above present fairly, in
all material respects, the net assets available for plan benefits of the Plan as
of December 31, 1998 and 1997, and the changes in net assets  available for plan
benefits for the year ended  December 31, 1998,  in  conformity  with  generally
accepted accounting principles.

Our audits  were  performed  for the  purpose of forming an opinion on the basic
financial statements taken as a whole. The supplemental schedules of assets held
for investment purposes as of December 31, 1998 included as Schedule I, loans or
fixed  income  obligations  as of  December  31, 1998  included as Schedule  II,
reportable  transactions  for the year  ended  December  31,  1998  included  as
Schedule III, and nonexempt  transactions  for the year ended  December 31, 1998
included as Schedule IV are presented for the purpose of additional analysis and
are not a required part of the basic financial  statements but are supplementary
information  required  by the  Department  of Labor  Rules and  Regulations  for
Reporting and Disclosure  under the Employee  Retirement  Income Security Act of
1974. The Fund  Information  in the statements of net assets  available for plan
benefits and the statements of changes in net assets available for plan benefits
is presented for purposes of additional  analysis rather than to present the net
assets  available for plan benefits and changes in net assets available for plan
benefits of each fund. The supplemental schedules and Fund Information have been
subjected  to the  auditing  procedures  applied  in  the  audits  of the  basic
financial  statements  and, in our  opinion,  is fairly  stated in all  material
respects in relation to the basic financial statements taken as a whole.

San Antonio, Texas
June 25, 1999

<PAGE>
<TABLE>
<CAPTION>
                       UDS 401(k) RETIREMENT SAVINGS PLAN
    STATEMENT OF NET ASSETS AVAILABLE FOR PLAN BENEFITS WITH FUND INFORMATION
                                DECEMBER 31, 1998


                                                         Vanguard        Vanguard       Vanguard        Vanguard         Vanguard
                                                        500 Index     International  International     Long Term         PRIMECAP
                                                          Fund         Growth Fund     Value Fund    Corporate Fund        Fund
                                                        ---------     -------------  -------------   --------------      --------
<S>                                                    <C>              <C>             <C>             <C>              <C>
Assets
Investments, at fair value:
  Registered investment companies                      $20,240,168      $1,632,828      $781,985       $2,629,504      $23,299,306
  Collective trust                                              --              --            --               --               --
  Self-directed investments                                     --              --            --               --               --
  Ultramar Diamond Shamrock Corporation
      Common Stock                                              --              --            --               --               --
  Participant loans                                             --              --            --               --               --

                                                        20,240,168       1,632,828       781,985        2,629,504       23,299,306
                                                       -----------      ----------       -------       ----------      -----------

Contributions receivable:
  Employer                                                  91,427           6,842         4,465           10,592          102,335
  Employee                                                 310,675          19,175        21,467           40,298          354,201
                                                       -----------      ----------      --------       ----------      -----------
                                                           402,102          26,017        25,932           50,890          456,536
                                                       -----------      ----------      --------       ----------      -----------

Net assets available for plan benefits                 $20,642,270      $1,658,845      $807,917       $2,680,394      $23,755,842
                                                       ===========      ==========      ========       ==========      ===========

The accompanying notes are an integral part of this financial statement.
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
                       UDS 401(k) RETIREMENT SAVINGS PLAN
 STATEMENT OF NET ASSETS AVAILABLE FOR PLAN BENEFITS WITH FUND INFORMATION (Continued)
                                DECEMBER 31, 1998


                                                          Vanguard         Vanguard        Vanguard          Vanguard     Vanguard
                                                      Total Bond Market   U.S. Growth     Wellington        Windsor II  Money Market
                                                         Index Fund          Fund            Fund              Fund       Reserves
                                                      -----------------   -----------     ----------        ----------  ------------
<S>                                                      <C>              <C>             <C>               <C>           <C>
Assets
Investments, at fair value:
  Registered investment companies                        $3,752,337       $8,827,344      $30,377,371      $ 9,964,561    $     --
  Collective trust                                               --               --               --               --          --
  Self-directed investments                                      --               --               --               --          --
  Ultramar Diamond Shamrock Corporation
      Common Stock                                               --               --               --               --          --
  Participant loans                                              --               --               --               --          --
                                                          3,752,337        8,827,344       30,377,371        9,964,561          --
                                                         ----------       ----------      -----------       ----------      ------

Contributions receivable:
  Employer                                                   11,157           48,331          115,824           41,016          --
  Employee                                                   35,449          172,582          365,311          118,990          --
                                                         ----------       ----------      -----------       ----------      ------
                                                             46,606          220,913          481,135          160,006          --
                                                         ----------       ----------      -----------       ----------      ------

Net assets available for plan benefits                   $3,798,943       $9,048,257      $30,858,506      $10,124,567    $     --
                                                         ==========       ==========      ===========       ==========      ======

The accompanying notes are an integral part of this financial statement.
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
                       UDS 401(k) RETIREMENT SAVINGS PLAN
 STATEMENT OF NET ASSETS AVAILABLE FOR PLAN BENEFITS WITH FUND INFORMATION (Continued)
                                DECEMBER 31, 1998

                                                                                                        Ultramar
                                                                                                        Diamond
                                                                                                        Shamrock
                                                          Vanguard                         Self-       Corporation
                                                         Retirement      Participant     Directed      Common Stock
                                                        Savings Trust       Loans       Investments       Fund             Total
                                                        -------------    -----------    -----------    ------------        ------
<S>                                                      <C>              <C>             <C>          <C>              <C>
Assets
Investments, at fair value:
  Registered investment companies                        $        --      $       --      $    --                       $101,505,404
  Collective trust                                        26,074,686              --           --              --         26,074,686
  Self-directed investments                                       --             --       $64,831              --             64,831
  Ultramar Diamond Shamrock Corporation
      Common Stock                                                --              --           --       8,460,398          8,460,398
  Participant loans                                               --       5,055,048           --              --          5,055,048
                                                          ----------       ---------      -------       ---------       ------------
                                                          26,074,686       5,055,048       64,831       8,460,398        141,160,367
                                                          ----------       ---------      -------      ----------       ------------
Contributions receivable:
  Employer                                                   114,702              --           --          39,083            585,774
  Employee                                                   320,559              --           --          60,231          1,818,938
                                                         -----------      ----------      -------      ----------       ------------
                                                             435,261              --           --          99,314          2,404,712
                                                         -----------      ----------      -------      ----------       ------------

Net assets available for plan benefits                   $26,509,947      $5,055,048      $64,831      $8,559,712       $143,565,079
                                                         ===========      ==========      =======      ==========       ============

The accompanying notes are an integral part of this financial statement.
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
                       UDS 401(k) RETIREMENT SAVINGS PLAN
    STATEMENT OF NET ASSETS AVAILABLE FOR PLAN BENEFITS WITH FUND INFORMATION
                                DECEMBER 31, 1997

                                                                            Participant Directed
                                          -----------------------------------------------------------------------------------------
                                                                        Vanguard
                                           Vanguard       Vanguard      Long Term      Vanguard     Vanguard       Vanguard
                                           500 Index    International   Corporate     U.S. Growth  Wellington    Money Market
                                             Fund        Value Fund       Fund           Fund         Fund         Reserves
                                          ----------    -------------   ---------     -----------  ----------    ------------
<S>                                       <C>             <C>           <C>           <C>          <C>           <C>
Assets
Investments, at fair value:
  Registered investment companies         $13,773,480     $793,823      $1,509,450    $3,146,825   $10,737,932   $5,347,974
  Collective trust                                 --           --              --            --            --           --
  Self-directed investments
  Ultramar Diamond Shamrock Corporation
    Common Stock                                   --           --              --            --            --           --
  Participant loans                                --           --              --            --            --           --
                                          -----------     --------      ----------    ----------   -----------   ----------
                                           13,773,480      793,823       1,509,450     3,146,825    10,737,932    5,347,974
                                          -----------     --------      ----------    ----------   -----------   ----------

Contributions receivable:
  Employer                                     26,097        2,281           3,063         7,945        19,021       16,365
  Employee                                     95,946        9,740          11,474        30,399        70,521       47,321
                                          -----------     --------      ----------    ----------   -----------   ----------
                                              122,043       12,021          14,537        38,344        89,542       63,686
                                          -----------     --------      ----------    ----------   -----------   -----------

Net assets available for plan benefits    $13,895,523     $805,844      $1,523,987    $3,185,169   $10,827,474   $5,411,660
                                          ===========     ========      ==========    ==========   ===========   ==========

The accompanying notes are an integral part of this financial statement.
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
                       UDS 401(k) RETIREMENT SAVINGS PLAN
 STATEMENT OF NET ASSETS AVAILABLE FOR PLAN BENEFITS WITH FUND INFORMATION (Continued)
                                DECEMBER 31, 1997

                                              Participant Directed                          Non-Participant Directed
                                           ---------------------------                      ------------------------
                                             Vanguard                                          Ultramar Diamond
                                            Retirement     Participant     Self-Directed      Shamrock Corporation
                                           Savings Trust      Loans         Investments        Common Stock Fund           Total
                                           -------------   -----------     -------------      --------------------         -----
<S>                                        <C>             <C>               <C>                   <C>                   <C>
Assets
Investments, at fair value:
  Registered investment companies          $       --      $       --        $     --              $     --              $35,309,484
  Collective trust                          2,133,200              --              --                    --                2,133,200
  Self-directed investments                        --              --         351,808                    --                  351,808
  Ultramar Diamond Shamrock Corporation
    Common Stock                                   --              --              --               366,669                  366,669
  Participant loans                                --       2,625,887              --                    --                2,625,887
                                           ----------       ---------        --------              --------              -----------
                                            2,133,200       2,625,887         351,808               366,669               40,787,048
                                           ----------       ---------        --------              --------               ----------
Contributions receivable:
  Employer                                      2,004              --              --                 7,889                   84,665
  Employee                                      6,830              --              --                    --                  272,231
                                           ----------      ----------        --------              --------             ------------
                                                8,834              --              --                 7,889                  356,896
                                           ----------      ----------        --------              --------              -----------

Net assets available for plan benefits     $2,142,034      $2,625,887        $351,808              $374,558              $41,143,944
                                           ==========      ==========        ========              ========               ==========

The accompanying notes are an integral part of this financial statement.
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
                       UDS 401(k) RETIREMENT SAVINGS PLAN
 STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR PLAN BENEFITS WITH FUND INFORMATION
                      FOR THE YEAR ENDED DECEMBER 31, 1998

                                                      Vanguard      Vanguard        Vanguard        Vanguard         Vanguard
                                                      500 Index   International   International     Long Term        PRIMECAP
                                                        Fund       Growth Fund     Value Fund     Corporate Fund       Fund
                                                     -----------  -------------   -------------   --------------     --------
<S>                                                  <C>           <C>              <C>            <C>             <C>
Additions to net assets:
  Investment income:
    Interest and dividend income                     $   293,579   $   32,746       $ 56,838       $  158,133      $   754,378
    Net realized gain (loss) on sale of investments    1,756,669      (33,250)       113,649          (18,723)        (289,605)
    Net unrealized appreciation (depreciation)
      in fair value of investments                     1,962,415       28,130        (31,831)          14,094        2,043,013
                                                     -----------   ----------        -------       ----------      -----------
                                                       4,012,663       27,626        138,656          153,504        2,507,786
                                                     -----------   ----------        -------       ----------      -----------
  Contributions:
    Employer                                             555,245       53,966         24,445           56,234          619,303
    Employee                                           1,703,628      150,947        111,269          197,090        1,657,127
                                                     -----------   ----------        -------       ----------      -----------
                                                       2,258,873      204,913        135,714          253,324        2,276,430
                                                     -----------   ----------        -------       ----------      -----------

Asset transfers in from other plans                      318,974    1,589,056         51,422           34,622       17,681,820
                                                     -----------   ----------       --------       ----------      -----------

Total additions                                        6,590,510    1,821,595        325,792          441,450       22,466,036
                                                     -----------   ----------        -------       ----------      -----------

Deductions from net assets:
  Benefits paid to participants                        1,615,997      309,537         66,549          439,008        4,442,507
                                                     -----------   ----------       --------       ----------      ----------

Interfund transfers                                    1,772,234      146,787       (257,170)       1,153,965        5,732,313
                                                     -----------   ----------        -------       ----------      ----------

Net increase (decrease) in net assets
  available for plan benefits                          6,746,747    1,658,845          2,073        1,156,407      23,755,842

Net assets available for plan benefits:
  Beginning of year                                   13,895,523           --        805,844        1,523,987               --
                                                     -----------   ----------        -------       ----------      -----------
  End of year                                        $20,642,270   $1,658,845       $807,917       $2,680,394      $23,755,842
                                                     ===========   ==========       ========       ==========      ==========

The accompanying notes are an integral part of this financial statement.
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
                       UDS 401(k) RETIREMENT SAVINGS PLAN
 STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR PLAN BENEFITS WITH FUND INFORMATION (Continued)
                      FOR THE YEAR ENDED DECEMBER 31, 1998

                                                       Vanguard
                                                      Total Bond    Vanguard     Vanguard        Vanguard         Vanguard
                                                        Market     U.S. Growth  Wellington      Windsor II      Money Market
                                                      Index Fund      Fund         Fund            Fund           Reserves
                                                      ----------   -----------  ----------      ----------      ------------
<S>                                                   <C>          <C>          <C>             <C>              <C>
Additions to net assets:
  Investment income:
    Interest and dividend income                      $  163,282   $  528,568   $ 3,242,277     $ 1,016,205      $   77,622
    Net realized gain (loss) on sale of investments       20,650      506,042       570,746        (220,620)             --
    Net unrealized appreciation (depreciation)
      in fair value of investments                        40,050      797,597    (1,937,414)       (656,596)             --
                                                      ----------   ----------   -----------     -----------      ----------
                                                         223,982    1,832,207     1,875,609         138,989          77,622
                                                      ----------   ----------   -----------     -----------      ----------
  Contributions:
    Employer                                              56,232      280,062       847,372         291,680          34,779
    Employee                                             164,224      892,690     2,221,758         860,588          86,922
                                                      ----------   ----------   -----------     -----------      ----------
                                                         220,456    1,172,752     3,069,130       1,152,268         121,701
                                                      ----------   ----------   -----------     -----------      ----------

Asset transfers in from other plans                    3,129,317      303,666    12,450,981       7,099,578
                                                      ----------   ----------   -----------     -----------      ----------

Total additions                                        3,573,755    3,308,625    17,395,720       8,390,835         199,323
                                                      ----------   ----------   -----------     -----------      ----------

Deductions from net assets:
  Benefits paid to participants                          959,625      442,335     3,758,625       1,358,024         401,173
                                                      ----------   ----------   -----------     -----------      ----------

Interfund transfers                                    1,184,813    2,996,798     6,393,937       3,091,756      (5,209,810)
                                                      ----------    ---------   -----------     -----------      ----------

Net increase (decrease) in net assets
  available for plan benefits                          3,798,943    5,863,088    20,031,032      10,124,567      (5,411,660)

Net assets available for plan benefits:
  Beginning of year                                           --    3,185,169    10,827,474              --       5,411,660
                                                      ----------   ----------   -----------     -----------      ----------
  End of year                                         $3,798,943   $9,048,257   $30,858,506     $10,124,567      $       --
                                                      ==========   ==========   ===========     ===========      ==========

The accompanying notes are an integral part of this financial statement.
</TABLE>
<PAGE>
<TABLE>
<CAPTION>

                       UDS 401(k) RETIREMENT SAVINGS PLAN
 STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR PLAN BENEFITS WITH FUND INFORMATION (Continued)
                      FOR THE YEAR ENDED DECEMBER 31, 1998

                                                         CIGNA           CIGNA         CIGNA         CIGNA         CIGNA
                                                      Fixed Income    Lifetime 20   Lifetime 30    Lifetime 40   Lifetime 50
                                                        Account          Fund          Fund           Fund          Fund
                                                      ------------    -----------   -----------    -----------   -----------
<S>                                                   <C>              <C>           <C>            <C>           <C>
Additions to net assets:
  Investment income:
    Interest and dividend income                      $   191,363      $      --     $      --      $     --      $     --
    Net realized gain (loss) on sale of investments            --         24,112        30,431        27,165        12,942
    Net unrealized appreciation (depreciation)
      in fair value of investments                             --             --            --            --            --
                                                      -----------      ---------     ---------      --------      --------
                                                          191,363         24,112        30,431        27,165        12,942
                                                      -----------      ---------     ---------      --------      --------

  Contributions:
    Employer                                              153,651          7,802         9,990         8,277         3,737
    Employee                                              356,805        15,573         22,087        20,058        10,948
                                                      -----------      ---------     ---------      --------      --------
                                                          510,456         23,375        32,077        28,335        14,685
                                                      -----------      ---------     ---------      --------      --------

Asset transfers in from other plans                    11,965,900        231,968       321,255       310,479       162,733
                                                      -----------      ---------     ---------      --------      --------

Total additions                                        12,667,719        279,455       383,763       365,979       190,360
                                                      -----------      ---------     ---------      --------      --------

Deductions from net assets:
  Benefits paid to participants                           477,113          4,913         4,990         5,287           115
                                                      -----------      ---------     ---------      --------      --------

Interfund transfers                                   (12,190,606)     (274,542)     (378,773)      (360,692)     (190,245)
                                                      -----------      ---------     ---------      --------      --------

Net increase (decrease) in net assets
  available for plan benefits                                  --             --            --            --            --

Net assets available for plan benefits:
  Beginning of year                                            --             --            --            --            --
                                                      -----------      ---------     ---------      --------      --------
  End of year                                         $        --      $      --     $      --      $     --      $     --
                                                      ===========      =========     =========      ========      ========

The accompanying notes are an integral part of this financial statement.
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
                       UDS 401(k) RETIREMENT SAVINGS PLAN
 STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR PLAN BENEFITS WITH FUND INFORMATION (Continued)
                      FOR THE YEAR ENDED DECEMBER 31, 1998

                                                                                Fidelity      Fidelity          Fidelity
                                                                                Advisor        Advisor          Advisor
                                                       CIGNA       CIGNA       Income and      Growth           Strategic
                                                    Lifetime 60   Balanced       Growth     Opportunities     Opportunities
                                                       Fund       Account        Account       Account           Account
                                                    -----------   --------     ----------   -------------     -------------
<S>                                                   <C>         <C>          <C>            <C>              <C>
Additions to net assets:
  Investment income:
    Interest and dividend income                      $    --     $     --     $       --     $       --       $       --
    Net realized gain (loss) on sale of investments     1,638       13,401        486,726        446,491          447,708
    Net unrealized appreciation (depreciation)
      in fair value of investments                         --           --             --             --               --
                                                      -------     --------     ----------     ----------       ----------
                                                        1,638       13,401        486,726        446,491          447,708
                                                      -------     --------     ----------     ----------       ----------

  Contributions:
    Employer                                            1,481        6,558         73,819         69,575           47,644
    Employee                                            3,743        7,752        130,558        154,841           86,950
                                                      -------     --------     ----------     ----------       ----------
                                                        5,224       14,310        204,377        224,416          134,594
                                                      -------     --------     ----------     ----------       ----------

Asset transfers in from other plans                    30,239      154,052      5,970,116      4,465,650        3,362,638
                                                      -------     --------     ----------     ----------       ----------

Total additions                                        37,101      181,763      6,661,219      5,136,557        3,944,940
                                                      -------     --------     ----------     ----------       ----------

Deductions from net assets:
  Benefits paid to participants                            71        1,626        163,375         49,812           79,490
                                                      -------     --------     ----------     ----------       ----------

Interfund transfers                                   (37,030)    (180,137)    (6,497,844)    (5,086,745)      (3,865,450)
                                                      -------     --------     ----------     ----------       ----------

Net increase (decrease) in net assets
  available for plan benefits                              --           --             --             --               --

Net assets available for plan benefits:
  Beginning of year                                        --           --             --             --               --
                                                      -------     --------     ----------     ----------       ----------
  End of year                                         $    --     $     --     $       --     $       --       $       --
                                                      =======     ========     ==========     ==========       ==========

The accompanying notes are an integral part of this financial statement.
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
                       UDS 401(k) RETIREMENT SAVINGS PLAN
 STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR PLAN BENEFITS WITH FUND INFORMATION (Continued)
                      FOR THE YEAR ENDED DECEMBER 31, 1998


                                                                                              Warburg        Warburg        CIGNA
                                                                  INVESCO     Twentieth       Pincus          Pincus        Stock
                                                                Industrial     Century       Emerging     International    Market
                                                                  Income        Ultra         Growth          Equity        Index
                                                                  Account      Account        Account         Account      Account
                                                                ----------    ----------     ----------    -------------   -------
<S>                                                              <C>          <C>            <C>            <C>          <C>
Additions to net assets:
  Investment income:
    Interest and dividend income                                 $      -     $        -     $        -     $      -     $        -
    Net realized gain (loss) on sale of investments                33,057        217,680        280,040       32,175        152,344
    Net unrealized appreciation (depreciation)
      in fair value of investments                                     --             --             --           --             --
                                                                 --------     ----------     ----------     --------     ----------
                                                                   33,057        217,680        280,040       32,175        152,344
                                                                 --------     ----------     ----------     --------     ----------
  Contributions:
    Employer                                                        7,112         29,092         31,110        6,046         21,611
    Employee                                                       17,235         66,047         59,163       14,049         54,099
                                                                 --------     ----------     ----------     --------     ----------
                                                                   24,347         95,139         90,273       20,095         75,710
                                                                 --------     ----------     ----------     --------     ----------

Asset transfers in from other plans                               353,566      1,388,073      2,297,049      356,165      1,081,413
                                                                 --------     ----------     ----------     --------     ----------

Total additions                                                   410,970      1,700,892      2,667,362      408,435      1,309,467
                                                                 --------     ----------     ----------     --------     ----------

Deductions from net assets:
  Benefits paid to participants                                     1,042          6,335         58,090          847           (250)
                                                                 --------     ----------     ----------     --------     ----------

Interfund transfers                                              (409,928)    (1,694,557)    (2,609,272)    (407,588)    (1,309,717)
                                                                 --------     ----------     ----------     --------     ----------
Net increase (decrease) in net assets
  available for plan benefits                                          --             --             --           --             --

Net assets available for plan benefits:
  Beginning of year                                                    --             --             --           --             --
                                                                 --------     ----------     ----------     --------     ----------
  End of year                                                    $     --     $       --     $       --     $     --     $       --
                                                                 ========     ==========     ==========     ========     ==========

The accompanying notes are an integral part of this financial statement.
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
                                                  UDS 401(k) RETIREMENT SAVINGS PLAN
                   STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR PLAN BENEFITS WITH FUND INFORMATION (Continued)
                                                 FOR THE YEAR ENDED DECEMBER 31, 1998


                                                                                                        Ultramar
                                                                                                        Diamond
                                                                                                        Shamrock
                                                                                                       Corporation
                                                             Vanguard                                    Common
                                                            Retirement   Participant    Self-Directed    Stock
                                                          Savings Trust     Loans        Investments      Fund            Total
                                                          -------------  -----------    -------------  -----------        ------
<S>                                                         <C>           <C>             <C>          <C>             <C>

Additions to net assets:
  Investment income:
    Interest and dividend income                            $ 1,293,376   $  382,915      $  4,074     $   316,037        8,511,393
    Net realized gain (loss) on sale of investments                  --           --        (1,259)       (637,920)       3,972,289
    Net unrealized appreciation (depreciation)
      in fair value of investments                                   --           --         6,905      (3,087,739)        (821,376)
                                                            -----------   ----------      --------      ----------     ------------
                                                              1,293,376      382,915         9,720      (3,409,622)      11,662,306
                                                            -----------   ----------      --------      ----------     ------------
  Contributions:
    Employer                                                    824,660           --            --         297,171        4,418,654
    Employee                                                  1,994,088           --            --         506,867       11,567,106
                                                            -----------   ----------      --------      ----------     ------------
                                                              2,818,748           --            --         804,038       15,985,760
                                                            -----------   ----------      --------      ----------     ------------

Asset transfers in from other plans                           8,816,490    2,710,659            --      12,081,038       98,718,919
                                                            -----------   ----------      --------      ----------     ------------

Total additions                                              12,928,614    3,093,574         9,720       9,475,454      126,366,985
                                                            -----------   ----------      --------     -----------     ------------

Deductions from net assets:
  Benefits paid to participants                               6,857,098      664,413       296,697       1,481,406       23,945,850
                                                            -----------   ----------      --------     -----------     ------------

Interfund transfers                                          18,296,397           --            --         191,106               --
                                                            -----------   ----------      --------     -----------     ------------

Net increase (decrease) in net assets
  available for plan benefits                                24,367,913    2,429,161      (286,977)      8,185,154      102,421,135

Net assets available for plan benefits:
  Beginning of year                                           2,142,034    2,625,887       351,808         374,558       41,143,944
                                                            -----------   ----------      --------     -----------     ------------
  End of year                                               $26,509,947   $5,055,048      $ 64,831     $ 8,559,712     $143,565,079
                                                            ===========   ==========      ========     ===========     ============

The accompanying notes are an integral part of this financial statement.
</TABLE>
<PAGE>


                       UDS 401(k) RETIREMENT SAVINGS PLAN

                          NOTES TO FINANCIAL STATEMENTS
                           December 31, 1998 and 1997


NOTE 1:  DESCRIPTION OF PLAN

The following  description of the UDS 401(k) Retirement Savings Plan (the Plan),
formerly the Ultramar Diamond Shamrock  Corporation U.S. Savings Incentive Plan,
provides  only  general  information.  Participants  should  refer  to the  Plan
agreement,  effective  January 1, 1998,  for a more complete  description of the
Plan's provisions.

Plan Merger
Effective  January 1, 1998,  the Ultramar  Diamond  Shamrock  401(k)  Retirement
Savings  Plan was merged into the Ultramar  Diamond  Shamrock  Corporation  U.S.
Savings Incentive Plan.  Effective April 1, 1998, the Total Petroleum,  Inc. Tax
Reduction Thrift Plan and the Total Petroleum, Inc. Retail Thrift Plan were also
merged into the Ultramar  Diamond Shamrock  Corporation  U.S. Savings  Incentive
Plan.  Effective January 1, 1998, the Ultramar Diamond Shamrock Corporation U.S.
Savings Incentive Plan was renamed the UDS 401(k)
Retirement Savings Plan.

Effective  December 31, 1998,  Ultramar Energy Inc. U.S. Savings  Incentive Plan
merged with the Plan.

From January 1, 1998 through March 31, 1998,  participants' accounts included in
the Ultramar  Diamond  Shamrock 401(k)  Retirement  Savings Plan continued to be
processed by CG Trust Company.  Participant  account  balances were  transferred
from CG  Trust  Company  and  Fidelity  Management  Trust  Company  to  Vanguard
Fiduciary Trust Company's investment funds with similar investment objectives on
March 31, 1998. These transfers into the Plan are included in Asset transfers in
from  other  plans  in the  accompanying  Statement  of  Changes  in Net  Assets
Available for Plan Benefits with Fund  Information  for the year ended  December
31, 1998.  Participants were allowed to transfer their account balances to other
funds within the Plan subsequent to the merger of the plans.

General

The Plan is a defined  contribution  plan  covering  all  eligible  employees of
Ultramar Diamond Shamrock Corporation (the Company).  Eligible employees include
all non-union  employees and certain union employees who have completed one year
of service  and who are at least 21 years old (18 years old after  December  31,
1998). The Plan is subject to the provisions of the Employee  Retirement  Income
Security Act of 1974 (ERISA), as amended.

The Company is the Sponsor of the Plan. The Plan is administered by the Employee
Benefits Committee (the Administrator)  which consists of at least three members
appointed  by the Chief  Executive  Officer  of the  Company.  The  trustee  and
recordkeeper of the Plan is Vanguard Fiduciary Trust Company.

<PAGE>

Contributions

Participants can contribute from 1% to 15% of their compensation,  as defined in
the Plan.  In  addition,  rollover  contributions  may be made by any  employee,
including  any  employee  who is not yet  eligible to  participate  in the Plan.
Effective  January 1, 1998, the Company will contribute $0.60 for every $1.00 of
the  participant's  contribution up to 6% of compensation.  The Company matching
contributions  are  invested  in the  same  investment  fund(s)  and in the same
proportion as the participant's current investment options.

The Company may make discretionary  Company contributions to the Plan for a Plan
year, subject to certain limitations.  For the years ended December 31, 1998 and
1997, the Company did not make additional discretionary Company contributions to
the Plan.

The Internal Revenue Code (IRC)  establishes an annual  limitation on the amount
of individual  pre-tax salary  deferral  contributions.  For 1998 and 1997, this
limit was $10,000 and $9,500, respectively.

Participant Accounts

Each  participant's  account  is  valued  on a daily  basis  and is equal to the
participant's  and the  Company's  contributions  plus  investment  income  less
benefits paid to the  participant,  loans,  and  administrative  expenses of the
Plan.

Vesting

Participants vest immediately in their contributions, rollover contributions and
actual earnings thereon. Participants become 100% vested in Company matching and
discretionary  contributions  and related  earnings after five years of service.
However,  a participant  will be vested in 100% of his account  balance upon his
death, disability,  attainment of Normal Retirement Age, as defined in the Plan,
termination  or  partial  termination  of the Plan or a change  in  control,  as
defined in the Plan.

A participant who as of December 31, 1997  participated in the Ultramar  Diamond
Shamrock  Corporation U.S. Savings  Incentive Plan is 100% vested in his account
balance under the Plan. A participant  who as of March 31, 1998  participated in
the Total Petroleum, Inc. Tax Reduction Thrift Plan or the Total Petroleum, Inc.
Retail  Thrift  Plan is 100%  vested in his account  balance  under the Plan.  A
participant  who as of December 31, 1997  participated  in the Ultramar  Diamond
Shamrock  Corporation  401(k)  Retirement  Savings  Plan  and  in  the  National
Convenience  Stores,  Incorporated  Profit Sharing Plan  immediately  before the
merger of these two plans,  with  three or more  years of vesting  service as of
July 1, 1996, is 100% vested in his account  balance.  A  participant  who as of
December 31, 1998  participated in the Ultramar Energy Inc. U.S. Savings Plan is
vested 100% in his account balance.

<PAGE>

Investment Options

During the year ended  December  31,  1998,  participants  were able to allocate
their  contributions  and transfer existing account balances among the following
investment options:

    -- Vanguard 500 Index Fund seeks to provide  long-term growth of capital and
       income from  dividends  by holding all of the 500 stocks that make up the
       unmanaged  Standard & Poor's 500  Composite  Stock Price Index,  a widely
       recognized benchmark of U.S. stock market performance.

    -- Vanguard  International  Growth Fund seeks to provide long-term growth of
       capital by investing in stocks of high-quality,  seasoned companies based
       outside  the  United  States.  Stocks  are  selected  from  more  than 15
       countries.

    -- Vanguard  International  Value Fund seeks to provide  long-term growth of
       capital  and  income by  investing  in a  diversified  group of large and
       medium-sized companies based outside of the United States.

    -- Vanguard Long-Term Corporate Fund seeks to provide a high and sustainable
       level of interest income by investing primarily in a diversified group of
       long-term bonds issued by corporations with strong credit ratings.

    -- Vanguard  PRIMECAP Fund seeks long-term growth of capital by investing in
       stocks of companies with  above-average  prospects for continued earnings
       growth, strong industry positions, and skilled management teams.

    -- Vanguard  Total Bond  Market  Index Fund seeks to provide a high level of
       interest  income by attempting to match the  performance of the unmanaged
       Lehman  Brothers  Aggregate  Bond  Index,  which is a  widely  recognized
       measure of the entire taxable U.S. bond market.

    -- Vanguard U.S. Growth Fund seeks to provide long-term growth of capital by
       investing in large, high-quality, seasoned U.S. companies with records of
       exceptional growth and above-average prospects for future growth.

    -- Vanguard  Wellington Fund seeks to provide income and long-term growth of
       capital  without  undue  risk to capital  by  investing  about 65% of its
       assets in stocks and the remaining 35% in bonds.

    -- Vanguard Windsor II Fund seeks to provide long-term growth of capital and
       income from dividends by investing in a diversified group of out-of-favor
       stocks of  large-capitalization  companies.  The stocks generally sell at
       prices below the overall market average compared to their dividend income
       and future return potential.

    -- Vanguard Money Market  Reserves seeks to provide high income and a stable
       share price of $1 by investing in short-term,  high-quality  money market
       instruments issued by financial institutions, non-financial corporations,
       the U.S.
       government, and federal agencies.

    -- Vanguard Retirement Savings Trust seeks stability of principal and a high
       level of current  income  consistent  with a two- to  three-year  average
       maturity.  The trust is a tax-exempt  collective trust invested primarily
       in investment  contracts  issued by insurance  companies  and  commercial
       banks,  and  similar  types of  fixed-principal  investments.  The  trust
       intends to maintain a constant  net asset  value of $1.00 per share.  The
       contracts  are fully benefit  responsive  and are recorded at fair value.
       The average  yield for the year ended  December  31, 1998 was 6.15%.  The
       crediting  interest  rate as of December  31, 1998 and 1997 was 5.93% and
       6.23%, respectively.

    -- Self-Directed   Investments   are  used  to  account  for   participants'
       self-directed  investments  attributable to rollover  contributions  from
       designated   prior   plans.   Current   participants,   excluding   those
       participants  from the prior  plan with this  provision,  are not able to
       contribute to self-directed investments as an investment election.

    -- Ultramar Diamond Shamrock  Corporation Common Stock Fund seeks to provide
       the potential for long-term growth through  increases in the value of the
       stock and  reinvestment  of its  dividends.  This fund is a unitized fund
       that includes stock and cash. The fund had 883,378 units and 12,230 units
       at December 31, 1998 and 1997, respectively.  Net asset value at December
       31, 1998 and 1997 was $9.58 and $12.65, respectively.

From January 1, 1998  through  March 31, 1998,  participants  previously  in the
Ultramar  Diamond  Shamrock  401(k)  Retirement  Savings  Plan  allocated  their
contributions among the Ultramar Diamond Shamrock  Corporation Common Stock Fund
and the following investment options:

    -- CIGNA Fixed Income Account invests in long-term fixed income  securities,
       such as corporate bonds and commercial  mortgages.  The principal and net
       credit  interest  are  fully  guaranteed  by  Connecticut   General  Life
       Insurance  Company  (CIGNA).  The contracts are included in the financial
       statements at contract value,  which approximates fair value, as reported
       to the Plan by CIGNA. Contract value represents  contributions made under
       the contract,  plus earnings,  less Plan  withdrawals and  administration
       expenses.

    -- CIGNA Lifetime Funds - These five groups of funds are  established by age
       of investor. They are invested primarily in common stocks or other equity
       securities  and various debt  instruments.  The allocation of investments
       between  fixed  income  and  equity  securities  for the five  groups  is
       generally as follows:

       CIGNA Lifetime 20 Fund  - 20% Fixed, 80% Equity
       ----------------------
       CIGNA Lifetime 30 Fund  - 30% Fixed, 70% Equity
       ----------------------
       CIGNA Lifetime 40 Fund  - 35% Fixed, 65% Equity
       ----------------------
       CIGNA Lifetime 50 Fund  - 45% Fixed, 55% Equity
       ----------------------
       CIGNA Lifetime 60 Fund  - 65% Fixed, 35% Equity
       ----------------------

    -- CIGNA Balanced  Account invests in pooled income (bonds),  equity (common
       stock), and cash equivalent (money market) accounts.

    -- Fidelity  Advisor  Income  &  Growth  Account  invests  in a  diversified
       portfolio of equity and fixed-income securities.

    -- Fidelity  Advisor Growth  Opportunities  Account invests in common stocks
       and securities convertible into common stocks.

    -- Fidelity  Advisor  Strategic  Opportunities  Account invests in stocks of
       domestic  and  foreign  companies  believed  to be  involved  in  special
       situations, such as technological advances or discoveries.

    -- INVESCO  Industrial  Income  Account  invests  in shares  of the  INVESCO
       Industrial Income Fund, a mutual fund of INVESCO Funds Group, Inc.

    -- Twentieth  Century Ultra Account invests in common stocks of medium sized
       companies.

    -- Warburg Pincus  Emerging  Growth Account invests in a portfolio of equity
       securities of domestic emerging growth companies.

    -- Warburg Pincus  International Equity Account invests in marketable equity
       securities of non-United  States  issues.  Up to 35% of the Fund's assets
       may be invested in the  securities  of companies  having their  principal
       business activities in the United States.

    -- CIGNA Stock Market Index  Account  invests in various  investments.  This
       fund's investment objective is to approximate the total return of the S &
       P 500 Index, thereby providing investors with long-term growth of capital
       and income.  From time to time,  this account  engages in limited futures
       transactions.  Such  transactions are recorded at market value and do not
       have a material impact on the financial statements of the Plan.

Effective January 1, 1999, the following  investment option will be available to
participants:

    -- Vanguard  Extended Market Index Fund seeks  long-term  growth of capital.
       Funds are  invested  in a large  sample of stocks  that  matches  certain
       characteristics of the Wilshire 4500 Equity Index.

Transfers

Plan participants can transfer the balances in any of the investment  options on
a daily basis.

Participant Loans

Participants may borrow from their vested account balance a minimum of $1,000 up
to a maximum  equal to the  lesser of  $50,000  or 50% of their  vested  account
balance.  The  participant  may elect a  repayment  term of up to five years for
general purpose loans or up to 10 years for the purchase of a primary residence.
The loan is secured by a lien on the  participant's  vested account  balance and
bears  interest  at a  reasonable  rate  as  determined  by  the  Administrator.
Principal and interest is repaid through payroll  deductions.  A participant can
have only one loan  outstanding  at any time and must wait  three  months  after
paying off a loan before initiating a new loan.

Payment of Benefits

On  termination  of service,  a participant  can choose a lump-sum  distribution
equal to the vested  interest of his or her account or can defer receipt of such
distribution,  depending on the terminated participant's vested account balance.
If the vested account balance is less than $5,000,  the  distribution can not be
deferred. If the vested account balance is more than $5,000, the participant can
consent to the  distribution,  or can defer to a later date,  not later than the
normal retirement date. If the participant takes no action,  the distribution is
made at normal  retirement  date.  Optional  forms of payments are  available to
certain participants as described in the Plan agreement.

In the event of hardship,  participants can elect to withdraw a portion of their
vested account  balance,  subject to tax penalties and the cessation of elective
deferral contributions under certain circumstances.

Forfeitures

In the  event a  participant  terminates  before  becoming  100%  vested  in the
employer contributions,  the nonvested employer contribution amounts held in the
participant's account will be forfeited.  If the terminated participant receives
a  distribution  from the vested portion of his account,  the nonvested  amounts
remaining in the  participant's  account are treated as a forfeiture.  Forfeited
amounts  are  used to  reduce  future  employer  contributions  or  defray  Plan
administrative  costs.  During  1998,  employer  contributions  were  reduced by
approximately  $82,000 from forfeited nonvested  accounts.  At December 31, 1998
and  1997,   approximately  $159,000  and  $62,000,   respectively,   in  unused
forfeitures were available for future use under the Plan.

NOTE 2:  SUMMARY OF ACCOUNTING POLICIES

Basis of Accounting

The Plan's financial statements are prepared on the accrual basis of accounting.
Benefits paid to participants are recorded when paid.

Use of Estimates

The preparation of financial  statements in conformity  with generally  accepted
accounting principles requires management to make estimates and assumptions that
affect the reported amounts of assets,  liabilities,  and changes  therein,  and
disclosure of contingent  assets and  liabilities.  Actual  results could differ
from those estimates.

Investment Valuation and Income Recognition

Investments  in  registered  investment  companies  are valued at quoted  market
prices which  represent the net asset value of shares held by the Plan as of the
balance sheet date. The Plan's  investment in the collective  trust is valued at
fair value.  Self-directed  investments are valued at quoted market prices as of
the balance sheet date.  Participant loans are valued at cost which approximates
fair value.  The Company's  common stock is valued at its quoted market price as
of the balance sheet date.

Purchases and sales of investments are recorded on a trade-date basis.  Interest
income  is  recorded  on  the  accrual  basis.  Dividends  are  recorded  on the
ex-dividend  date.  Capital  gain  distributions  are  included in interest  and
dividend income.

Net Appreciation (Depreciation) in Fair Value of Investments

The Plan's method of accounting  for the  classification  of realized  gains and
losses  and  unrealized   appreciation   (depreciation)  of  investments  is  in
accordance with the rules enacted by the Department of Labor. The computation of
realized  gains and losses on the sale of investments is based on the fair value
(rather than historical  cost) of Plan assets at the beginning of the year or at
the time of purchase if purchased during the year, compared to the sale price of
the investment.  The computation of unrealized  appreciation  (depreciation)  of
investments  is based  on the  difference,  if any,  between  fair  value at the
beginning of the year plus current year purchases  compared to fair value at the
end of the year.

Plan Expenses

The Company pays the  administrative  expenses of the Plan and provides  certain
other services at no cost to the Plan.

Risks and Uncertainties

The Plan's  investments,  in  general,  are  exposed to various  risks,  such as
interest rate,  credit and overall market  volatility  risk. Due to the level of
risk associated with certain investment  securities,  it is reasonably  possible
that changes in the value of investment  securities  will occur in the near term
and that such changes could materially affect participants' account balances and
amounts presented in the statements of net assets available for plan benefits.

NOTE 3:  PLAN TERMINATION

Although  it has not  expressed  any intent to do so, the  Company has the right
under the Plan to discontinue or reduce its  contributions  and to terminate the
Plan at any time subject to the provisions of ERISA.

NOTE 4:  TAX STATUS

The Internal Revenue Service has determined and informed the Company by a letter
dated  September  22,  1995,  that the Plan and  related  trust are  designed in
accordance with applicable  sections of the IRC. The Plan has been amended since
receiving the determination letter.  However, the Company believes that the Plan
continues to qualify and to operate as designated.

<PAGE>

NOTE 5:  PARTY-IN-INTEREST TRANSACTIONS

Certain Plan  investments  are shares of registered  investment  companies and a
trust  managed by an  affiliate of the Trustee and shares of common stock of the
Company.   Transactions  in  these  investments  qualify  as   party-in-interest
transactions.

NOTE 6:  RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500

The following is a reconciliation  of net assets available for plan benefits per
the financial statements to the Form 5500:
<TABLE>
<CAPTION>
                                                                                           December 31,
                                                                                     1998                1997
                                                                                     ----                ----
<S>                                                                               <C>                 <C>
Net assets available for plan benefits per the financial statements               $143,565,079        $41,143,944
Amounts allocated to withdrawing participants                                       (1,151,538)           (75,207)
                                                                                  ------------        ------------
Net assets available for plan benefits per the Form 5500                          $142,413,541        $41,068,737
                                                                                  ============        ===========
</TABLE>

The  following is a  reconciliation  of benefits  paid to  participants  per the
financial statements to the Form 5500:

<TABLE>
<CAPTION>
                                                                                                  Year Ended
                                                                                              December 31, 1998
<S>                                                                                              <C>

Benefits paid to participants per the financial statements                                       $23,945,850
Add:  Amounts allocated to withdrawing participants at end of year                                 1,151,538
Less:  Amounts allocated to withdrawing participants at beginning of period                          (75,207)
                                                                                                 ------------
Benefits paid to participants per the Form 5500                                                  $25,022,181
                                                                                                 ===========
</TABLE>
<PAGE>

NOTE 7:  NONEXEMPT TRANSACTION

For the year ended December 31, 1998,  the Company  failed to remit  participant
contributions  totaling  $1,117,220  to the Plan within the  required  period as
specified by  applicable  Department  of Labor  regulations.  This resulted in a
prohibited  extension of credit to the Company.  This  transaction  represents a
nonexempt transaction.

<PAGE>
<TABLE>
<CAPTION>
                                                                     SCHEDULE I

                       UDS 401(k) RETIREMENT SAVINGS PLAN

           Line 27a - Schedule of Assets Held for Investment Purposes
                                December 31, 1998

                                                                                                               Current
      Identity of Issue                    Description of Issue                                Cost             Value
      -----------------                    --------------------                                ----            --------
<S>                                   <C>                                                  <C>               <C>
*  The Vanguard Group                 Vanguard 500 Index Fund                              $ 18,277,752      $ 20,240,168
*  The Vanguard Group                 Vanguard International Growth Fund                      1,604,698         1,632,828
*  The Vanguard Group                 Vanguard International Value Fund                         813,817           781,985
*  The Vanguard Group                 Vanguard Long Term Corporate Fund                       2,615,410         2,629,504
*  The Vanguard Group                 Vanguard PRIMECAP Fund                                 21,256,293        23,299,306
*  The Vanguard Group                 Vanguard Total Bond Market Index Fund                   3,712,287         3,752,337
*  The Vanguard Group                 Vanguard U.S. Growth Fund                               8,029,758         8,827,344
*  The Vanguard Group                 Vanguard Wellington Fund                               32,314,785        30,377,371
*  The Vanguard Group                 Vanguard Windsor II Fund                               10,621,157         9,964,561
*  The Vanguard Group                 Vanguard Retirement Savings Trust                      26,074,686        26,074,686

*  Ultramar Diamond                   Ultramar Diamond Shamrock Corporation
       Shamrock Corporation             Common Stock Fund                                    11,608,847         8,460,398

*  UDS 401(k) Retirement              Participant loans -
       Savings Plan                     Interest rates range from 7% - 11%                            -         5,055,048

Self-directed investments:
 Salomon Smith Barney Inc.            Concert Social Awareness Fund Class A                          **            17,651
 Salomon Smith Barney Inc.            Smith Barney Money Funds                                    6,924             6,924
 Salomon Smith Barney Inc.            Smith Barney Appreciation Fund                                 **            16,078
 Salomon Smith Barney Inc.            Government Backed Trust CL T-1                                 **             8,065
 Salomon Smith Barney Inc.            Government Backed Trust CTF                                    **             7,134
 Salomon Smith Barney Inc.            Government Trust CTF CL 3-C-REG                                               8,979
                                                                                       ----------------  ----------------
                                                                                                     **
                                                                                                  6,924            64,831
                                                                                       ----------------   ---------------

                                                                                           $136,936,414      $141,160,367
                                                                                       ================      ============

*    Parties-in-interest to the Plan.
**   Historical cost information is not available.
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
                                                                     SCHEDULE II

                       UDS 401(k) RETIREMENT SAVINGS PLAN

            Line 27b - Schedule of Loans or Fixed Income Obligations
                                December 31, 1998

                                               Amount Received During      Unpaid
                                  Original         Reporting Year        Balance at                               Amount Overdue
         Identity and              Amount          --------------          End of                                 --------------
      Address of Obligor          of Loan     Principal     Interest        Year       Description of Loan    Principal     Interest
      ------------------          -------     ---------     --------        ----       -------------------    ---------     --------
<S>                              <C>            <C>           <C>       <C>           <C>                      <C>           <C>
David J. Biederstadt                                                                  Loan made 4/8/93
354 E. 32nd St.                                                                       bears interest at
Loveland, CO  80538              $ 3,300.00     $ 0.00        $ 0.00     $   101.49   7.00% per year.          $  101.49     $  0.59

Charlotte I. Looper                                                                   Loan made 7/21/95
8728 Rambling Road                                                                    bears interest at
Oklahoma City, OK 73132            8,000.00       0.00          0.00       5,872.68   10.00% per year.          1,126.40      403.42

Patricia Hutchinson                                                                   Loan made 9/25/98
207 Morningside                                                                       bears interest at
League City, TX  77573             2,156.97       0.00          0.00       2,156.97   10.50% per year.             76.66       51.50

Charles R. Sayles                                                                     Loan made 12/12/96
PO Box 288                                                                            bears interest at
Azle, TX  76098                   12,556.00       0.00          0.00      10,212.80   9.25% per year.           1,906.45      711.35

James Satterfield                                                                     Loan made 9/9/94
RR19 Box 2675                                                                         bears interest at
Texarkana, AR  71854               8,000.00     766.43         18.57         194.55   8.25% per year.             194.55        1.34
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
                                                                    SCHEDULE III

                       UDS 401(k) RETIREMENT SAVINGS PLAN

                Line 27d - Schedule of Reportable Transactions **
                          Year Ended December 31, 1998

                                                                                                    Current Value
                                                                                      Historical     of Asset on      Net
   Identity of                                           Purchase       Selling        Cost of       Transaction      Gain
  Party Involved          Description of Asset            Price          Price          Asset            Date        (Loss)
  --------------          --------------------            -----          -----          -----            ----         ----
<S>                       <C>                           <C>            <C>            <C>            <C>            <C>
Single Transactions:
The Vanguard Group *      Vanguard PRIMECAP
                            Fund                        $25,455,178      N/A          $25,455,178    $25,455,178       N/A

The Vanguard Group *      Vanguard Total Bond
                            Market Index Fund             3,129,316      N/A            3,129,316      3,129,316       N/A

The Vanguard Group *      Vanguard Wellington
                            Fund                         20,342,847      N/A           20,342,847     20,342,847       N/A

The Vanguard Group *      Vanguard Wellington
                            Fund                          2,726,483      N/A            2,726,483      2,726,483       N/A

The Vanguard Group *      Vanguard Windsor II
                            Fund                         10,958,769      N/A           10,958,769     10,958,769       N/A

The Vanguard Group *      Vanguard Retirement
                            Savings Trust                20,991,610      N/A           20,991,610     20,991,610       N/A

Connecticut General       Fidelity Advisor Income
  Life Insurance            And Growth Account            N/A          $6,485,360       4,721,887      6,485,360    $1,763,473
  Company *

Connecticut General       Fidelity Advisor Growth
  Life Insurance            Opportunities Account         N/A           5,150,389       3,532,036      5,150,389     1,618,353
  Company *

Connecticut General       Fidelity Advisor
  Life Insurance          Strategic                       N/A           3,859,191       2,710,482      3,859,191     1,148,709
  Company *                 Opportunities Account

Connecticut General       Warburg Pincus
  Life Insurance            Emerging Growth
  Company *                 Account                       N/A           2,622,969       1,954,765      2,622,969       668,204

Ultramar Diamond          Ultramar Diamond
  Shamrock                  Shamrock Corporation
  Corporation*              Stock Fund                   12,208,652      N/A           12,208,652     12,208,652       N/A
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
                                                       SCHEDULE III (Continued)

                       UDS 401(k) RETIREMENT SAVINGS PLAN

                Line 27d - Schedule of Reportable Transactions **
                          Year Ended December 31, 1998
                                                                                                    Current Value
                                                                                      Historical      of Asset on     Net
   Identify of                                           Purchase       Selling         Cost of       Transaction     Gain
  Party Involved          Description of Asset            Price          Price           Asset            Date       (Loss)
  --------------          --------------------            -----          -----           -----            ----        ----
<S>                       <C>                           <C>           <C>             <C>            <C>              <C>
Series of Transactions:
The Vanguard Group *      Vanguard 500 Index Fund       $14,024,669      N/A          $14,024,669    $14,024,669       N/A

The Vanguard Group *      Vanguard 500 Index Fund         N/A         $11,277,065      10,826,270     11,277,065      $450,795

The Vanguard Group *      Vanguard International
                            Growth Fund                   2,236,731      N/A            2,236,731      2,236,731       N/A

The Vanguard Group *      Vanguard International
                            Growth Fund                   N/A             598,783         631,949        598,783       (33,166)

The Vanguard Group *      Vanguard Long-Term
                            Corporate Fund                3,279,245      N/A            3,279,245      3,279,245       N/A

The Vanguard Group *      Vanguard Long-Term
                            Corporate Fund                N/A           2,154,562       2,148,682      2,154,562         5,880

The Vanguard Group *      Vanguard PRIMECAP
                            Fund                         29,147,914      N/A           29,147,914     29,147,914       N/A

The Vanguard Group *      Vanguard PRIMECAP
                            Fund                          N/A           7,602,016       7,888,937      7,602,016      (286,921)

The Vanguard Group *      Vanguard Total Bond
                            Market Index Fund             6,342,300      N/A            6,342,300      6,342,300       N/A

The Vanguard Group *      Vanguard Total Bond
                            Market Index Fund             N/A           2,650,663       2,630,528      2,650,663        20,135

The Vanguard Group *      Vanguard U.S. Growth
                            Fund                          7,284,159      N/A            7,284,159      7,284,159       N/A

The Vanguard Group *      Vanguard U.S. Growth
                            Fund                          N/A           2,907,279       2,803,903      2,907,279       103,376

The Vanguard Group *      Vanguard Wellington
                            Fund                         28,852,823      N/A           28,852,823     28,852,823       N/A

The Vanguard Group *      Vanguard Wellington
                            Fund                          N/A           7,846,716       7,883,926      7,846,716       (37,210)
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
                                                        SCHEDULE III (Continued)

                       UDS 401(k) RETIREMENT SAVINGS PLAN

                Line 27d - Schedule of Reportable Transactions **
                          Year Ended December 31, 1998

                                                                                                    Current Value
                                                                                      Historical      of Asset on     Net
      Identity of                                        Purchase       Selling         Cost of       Transaction     Gain
     Party Involved       Description of Asset            Price          Price           Asset            Date       (Loss)
     --------------       --------------------            -----          -----           -----            ----        ----
<S>                       <C>                           <C>           <C>             <C>            <C>              <C>
Series of Transactions (continued):
The Vanguard Group *      Vanguard Windsor II
                            Fund                        $14,037,242      N/A          $14,037,242    $14,037,242       N/A

The Vanguard Group *      Vanguard Windsor II
                            Fund                          N/A         $3,195,465        3,414,388      3,195,465   $  (218,923)

The Vanguard Group *      Vanguard Money
                            Market Reserves               1,889,564      N/A            1,889,564      1,889,564       N/A

The Vanguard Group *      Vanguard Money
                            Market Reserves               N/A          7,237,538        7,237,538      7,237,538             -

The Vanguard Group *      Vanguard Retirement
                            Savings Trust                40,539,198      N/A           40,539,198     40,539,198       N/A

The Vanguard Group *      Vanguard Retirement
                            Savings Trust                 N/A         16,597,712       16,597,712     16,597,712             -

Connecticut General       Fidelity Advisor Income
  Life Insurance            and Growth Account              439,552      N/A              439,552        439,552       N/A
  Company *

Connecticut General       Fidelity Advisor Income
  Life Insurance            and Growth Account            N/A          6,752,721        4,922,922      6,752,721     1,829,799
  Company *

Connecticut General       Fidelity Advisor Growth
  Life Insurance            Opportunities Account           618,840      N/A              618,840        618,840       N/A
  Company *

Connecticut General       Fidelity Advisor Growth
  Life Insurance            Opportunities Account         N/A          5,287,601        3,630,478      5,287,601     1,657,123
  Company *

Connecticut General       Fidelity Advisor
  Life Insurance          Strategic                         330,844      N/A              330,844        330,844       N/A
  Company *                 Opportunities Account

Connecticut General       Fidelity Advisor
  Life Insurance          Strategic                       N/A          4,045,292        2,851,598      4,045,292     1,193,694
  Company *                 Opportunities Account
</TABLE>
<TABLE>
<CAPTION>
                                                        SCHEDULE III (Continued)

                                                  UDS 401(k) RETIREMENT SAVINGS PLAN

                                           Line 27d - Schedule of Reportable Transactions **
                                                     Year Ended December 31, 1998

                                                                                                    Current Value
                                                                                      Historical      of Asset on     Net
      Identity of                                        Purchase       Selling         Cost of       Transaction     Gain
     Party Involved       Description of Asset            Price          Price           Asset            Date       (Loss)
     --------------       --------------------            -----          -----           -----            ----        ----
<S>                       <C>                           <C>           <C>             <C>            <C>              <C>
Series of Transactions (continued):
Connecticut General       Warburg Pincus
  Life Insurance            Emerging Growth
  Company *                 Account                      $  321,463      N/A           $  321,463     $  321,463       N/A

Connecticut General       Warburg Pincus
  Life Insurance            Emerging Growth
  Company *                 Account                       N/A         $2,849,386        2,138,517      2,849,386      $710,869

Ultramar Diamond          Ultramar Diamond
  Shamrock                  Shamrock Corporation
 Corporation *              Stock Fund                    2,506,905      N/A            2,506,905      2,506,905       N/A

Ultramar Diamond          Ultramar Diamond
  Shamrock                  Shamrock Corporation
 Corporation *              Stock Fund                    N/A          2,776,343        3,437,021      2,776,343      (660,678)

*    Represents a party-in-interest.

**   Single  transaction  or a series  of  transactions  in  excess of 5% of the
     current  value of the Plan's assets as of the beginning of the plan year as
     defined  in 29  CFR  2520.103-6  of  the  Department  of  Labor  Rules  and
     Regulations  for Reporting and Disclosure  under ERISA.  The purchase price
     and selling price are net of related transaction expense.
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
                                                                    SCHEDULE IV

                       UDS 401(k) RETIREMENT SAVINGS PLAN

                  Line 27e - Schedule of Nonexempt Transactions
                          Year Ended December 31, 1998



                             Relationship to plan,
    Identity of               employer or other
    party involved              party-in-interest          Description of transactions         Amount        Interest
    --------------           ---------------------         ---------------------------         ------        --------
<S>                            <C>                         <C>                                 <C>           <C>
Ultramar Diamond               Employer                    Participant contributions were
  Shamrock Corporation                                     not remitted to the Plan in a
                                                           timely manner:

                                                           Deemed loan:  June 20, 1998
                                                           Remitted:  June 23, 1998            $1,117,220     $979
</TABLE>
<PAGE>

                                    SIGNATURE

The Plan.  Pursuant to the requirements of the Securities  Exchange Act of 1934,
the trustees (or other persons who  administer  the employee  benefit plan) have
duly  caused this  annual  report to be signed on its behalf by the  undersigned
hereunto duly authorized as of June 25, 1999.


UDS 401(k) Retirement Savings Plan

By:  /s/     Penelope Viteo
             Penelope Viteo
             Member, Employee Benefits Committee and
             Vice President, Ultramar Diamond Shamrock Corporation
<PAGE>

                                  Exhibit 23.1
                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

As independent public accountants, we hereby consent to the incorporation of our
reports  dated June 25,  1999  included  in this Form 11-K,  into the  Company's
previously filed Registration Statement File No. 333-27701.

                                                         /s/ ARTHUR ANDERSEN LLP


San Antonio, Texas
June 25, 1999


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