VALERO ENERGY CORP/TX
10-Q, 1999-08-13
PETROLEUM REFINING
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<PAGE>   1
===============================================================================


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

                                   FORM 10-Q

(Mark One)
[X]      QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934

                  FOR THE QUARTERLY PERIOD ENDED JUNE 30, 1999

                                       OR

[ ]      TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934

         For the transition period from _____________ to _____________


                         Commission file number 1-13175



                           VALERO ENERGY CORPORATION
             (Exact name of registrant as specified in its charter)

                    Delaware                           74-1828067
         (State or other jurisdiction of           (I.R.S. Employer
         incorporation or organization)            Identification No.)

                                One Valero Place
                               San Antonio, Texas
                    (Address of principal executive offices)
                                     78212
                                   (Zip Code)

                                 (210) 370-2000
              (Registrant's telephone number, including area code)

                                   ---------

         Indicate by check mark whether the registrant (1) has filed all
reports required to be filed by Section 13 or 15(d) of the Securities Exchange
Act of 1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.

                       Yes      X              No
                               ---                   ---

                                   ---------

         Indicated below is the number of shares outstanding of the
registrant's only class of common stock, as of August 1, 1999.

<TABLE>
<CAPTION>
                                                                              Number of
                                                                                 Shares
                                 Title of Class                               Outstanding
                                 --------------                               -----------

<S>                                                                        <C>
                        Common Stock, $.01 Par Value                          56,241,188
</TABLE>


===============================================================================

<PAGE>   2


                   VALERO ENERGY CORPORATION AND SUBSIDIARIES

                                     INDEX





<TABLE>
<CAPTION>
                                                                                                              Page
                                                                                                              ----
<S>   <C>                                                                                                     <C>
PART I.  FINANCIAL INFORMATION

  Item 1.  Financial Statements

      Consolidated Balance Sheets - June 30, 1999 and December 31, 1998.....................................   3

      Consolidated Statements of Income - For the Three Months Ended and
        Six Months Ended June 30, 1999 and 1998.............................................................   4

      Consolidated Statements of Cash Flows - For the Six Months Ended
        June 30, 1999 and 1998..............................................................................   5

      Notes to Consolidated Financial Statements............................................................   6

  Item 2.  Management's Discussion and Analysis of Financial Condition
      and Results of Operations.............................................................................  12

  Item 3.  Quantitative and Qualitative Disclosures About Market Risk.......................................  24

PART II.  OTHER INFORMATION.................................................................................  27

  Item 1.  Legal Proceedings................................................................................  27

  Item 4.  Submission of Matters to a Vote of Security Holders..............................................  27

  Item 6.  Exhibits and Reports on Form 8-K.................................................................  27

SIGNATURE...................................................................................................  28
</TABLE>






                                       2
<PAGE>   3



PART I - FINANCIAL INFORMATION

ITEM 1.  FINANCIAL STATEMENTS


                   VALERO ENERGY CORPORATION AND SUBSIDIARIES
                          CONSOLIDATED BALANCE SHEETS
                             (THOUSANDS OF DOLLARS)

<TABLE>
<CAPTION>
                                                                           June 30,
                                                                            1999               December 31,
                                                                          (Unaudited)              1998
                                                                         -------------        --------------
<S>                                                                       <C>                 <C>
                     ASSETS

CURRENT ASSETS:
  Cash and temporary cash investments ................................    $     5,804         $    11,199
  Receivables, less allowance for doubtful accounts of
    $1,600 (1999) and $1,150 (1998) ..................................        302,428             283,456
  Inventories ........................................................        329,612             316,405
  Current deferred income tax assets .................................         79,946               4,851
  Prepaid expenses and other .........................................         20,359              23,799
                                                                          -----------         -----------
                                                                              738,149             639,710
                                                                          -----------         -----------
PROPERTY, PLANT AND EQUIPMENT - including
  construction in progress of $147,467 (1999)
  and $179,136 (1998), at cost .......................................      2,628,453           2,572,190
    Less:  Accumulated depreciation ..................................        655,578             612,847
                                                                          -----------         -----------
                                                                            1,972,875           1,959,343
                                                                          -----------         -----------

DEFERRED CHARGES AND OTHER ASSETS ....................................        158,960             126,611
                                                                          -----------         -----------
                                                                          $ 2,869,984         $ 2,725,664
                                                                          ===========         ===========

        LIABILITIES AND STOCKHOLDERS' EQUITY

CURRENT LIABILITIES:
  Short-term debt ....................................................    $    31,000         $   160,000
  Accounts payable ...................................................        422,022             283,183
  Accrued expenses ...................................................         60,139              54,561
                                                                          -----------         -----------
                                                                              513,161             497,744
                                                                          -----------         -----------

LONG-TERM DEBT .......................................................        916,104             822,335
                                                                          -----------         -----------

DEFERRED INCOME TAXES ................................................        271,606             210,389
                                                                          -----------         -----------

DEFERRED CREDITS AND OTHER LIABILITIES ...............................        112,989             109,909
                                                                          -----------         -----------

COMMON STOCKHOLDERS' EQUITY:
  Common stock, $.01 par value - 150,000,000 shares authorized;
    issued 56,314,798 (1999 and 1998) shares .........................            563                 563
  Additional paid-in capital .........................................      1,100,615           1,112,726
  Accumulated deficit ................................................        (42,419)            (17,618)
  Treasury stock, 99,353 (1999) and 378,130 (1998) shares, at cost ...         (2,635)            (10,384)
                                                                          -----------         -----------
                                                                            1,056,124           1,085,287
                                                                          -----------         -----------
                                                                          $ 2,869,984         $ 2,725,664
                                                                          ===========         ===========
</TABLE>

                See Notes to Consolidated Financial Statements.



                                       3
<PAGE>   4

                   VALERO ENERGY CORPORATION AND SUBSIDIARIES
                       CONSOLIDATED STATEMENTS OF INCOME
                (THOUSANDS OF DOLLARS, EXCEPT PER SHARE AMOUNTS)
                                  (UNAUDITED)


<TABLE>
<CAPTION>
                                                               Three Months Ended                     Six Months Ended
                                                                    June 30,                               June 30,
                                                        -------------------------------         -------------------------------
                                                            1999               1998                1999                1998
                                                        -----------         -----------         -----------         -----------

<S>                                                     <C>                 <C>                 <C>                 <C>
OPERATING REVENUES ..................................   $ 1,824,450         $ 1,448,104         $ 3,161,553         $ 2,810,463
                                                        -----------         -----------         -----------         -----------

COSTS AND EXPENSES:
  Cost of sales and operating expenses ..............     1,808,653           1,346,460           3,096,000           2,638,729
  Write-down of inventories to market value .........          --                  --                  --                37,673
  Selling and administrative expenses ...............        14,540              18,585              32,728              35,915
  Depreciation expense ..............................        21,990              18,735              45,038              36,239
                                                        -----------         -----------         -----------         -----------
    Total ...........................................     1,845,183           1,383,780           3,173,766           2,748,556
                                                        -----------         -----------         -----------         -----------

OPERATING INCOME (LOSS) .............................       (20,733)             64,324             (12,213)             61,907

OTHER INCOME, NET ...................................         1,066                 482                 987                 437

INTEREST AND DEBT EXPENSE:
  Incurred ..........................................       (16,013)             (8,292)            (30,301)            (15,868)
  Capitalized .......................................         1,495               1,125               3,326               1,879
                                                        -----------         -----------         -----------         -----------

INCOME (LOSS) BEFORE INCOME TAXES ...................       (34,185)             57,639             (38,201)             48,355

INCOME TAX EXPENSE (BENEFIT) ........................       (12,100)             17,700             (13,400)             14,300
                                                        -----------         -----------         -----------         -----------

NET INCOME (LOSS) ...................................   $   (22,085)        $    39,939         $   (24,801)        $    34,055
                                                        ===========         ===========         ===========         ===========

EARNINGS (LOSS) PER SHARE OF COMMON STOCK ...........   $      (.39)        $       .71         $      (.44)        $       .61

  Weighted average common shares outstanding
(in thousands) ......................................        56,162              56,201              56,109              56,175

EARNINGS (LOSS) PER SHARE OF COMMON STOCK -
  ASSUMING DILUTION .................................   $      (.39)        $       .70         $      (.44)        $       .59

  Weighted average common shares outstanding -
    assuming dilution (in thousands) ................        56,162              57,353              56,109              57,319

DIVIDENDS PER SHARE OF COMMON STOCK .................   $       .08         $       .08         $       .16         $       .16
</TABLE>


                See Notes to Consolidated Financial Statements.



                                       4
<PAGE>   5

                   VALERO ENERGY CORPORATION AND SUBSIDIARIES
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                             (THOUSANDS OF DOLLARS)
                                  (UNAUDITED)


<TABLE>
<CAPTION>
                                                                              Six Months Ended
                                                                                   June 30,
                                                                         ---------------------------
                                                                            1999              1998
                                                                         ---------         ---------

<S>                                                                      <C>               <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net income (loss) .............................................        $ (24,801)        $  34,055
  Adjustments to reconcile net income (loss)
    to net cash provided by operating activities:
      Depreciation expense ......................................           45,038            36,239
      Amortization of deferred charges and other, net ...........           26,090            18,733
      Write-down of inventories to market value .................             --              37,673
      Changes in current assets and current liabilities .........          114,472            13,453
      Deferred income tax expense (benefit) .....................          (13,800)            3,000
      Changes in deferred items and other, net ..................              880              (460)
                                                                         ---------         ---------
        Net cash provided by operating activities ...............          147,879           142,693
                                                                         ---------         ---------

CASH FLOWS FROM INVESTING ACTIVITIES:
  Capital expenditures ..........................................          (58,270)          (68,942)
  Deferred turnaround and catalyst costs ........................          (52,763)          (39,886)
  Earn-out payment in connection with Basis acquisition .........             --             (10,325)
  Other, net ....................................................             (127)              857
                                                                         ---------         ---------
    Net cash used in investing activities .......................         (111,160)         (118,296)
                                                                         ---------         ---------

CASH FLOWS FROM FINANCING ACTIVITIES:
  Increase (decrease) in short-term debt, net ...................         (129,000)            3,000
  Long-term borrowings ..........................................          592,794           103,741
  Long-term debt reduction ......................................         (501,000)         (125,000)
  Common stock dividends ........................................           (8,978)           (8,986)
  Issuance of common stock ......................................            4,696               933
  Purchase of treasury stock ....................................             (626)           (1,442)
                                                                         ---------         ---------
    Net cash used in financing activities .......................          (42,114)          (27,754)
                                                                         ---------         ---------

NET DECREASE IN CASH AND TEMPORARY
  CASH INVESTMENTS ..............................................           (5,395)           (3,357)

CASH AND TEMPORARY CASH INVESTMENTS AT
  BEGINNING OF PERIOD ...........................................           11,199             9,935
                                                                         ---------         ---------

CASH AND TEMPORARY CASH INVESTMENTS AT
  END OF PERIOD .................................................        $   5,804         $   6,578
                                                                         =========         =========
</TABLE>


                See Notes to Consolidated Financial Statements.



                                       5
<PAGE>   6


                   VALERO ENERGY CORPORATION AND SUBSIDIARIES

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


1.  BASIS OF PRESENTATION

         The consolidated financial statements included herein have been
prepared by Valero Energy Corporation ("Valero") and subsidiaries (collectively
referred to as the "Company"), without audit, pursuant to the rules and
regulations of the Securities and Exchange Commission ("SEC"). However, all
adjustments have been made to the accompanying financial statements which are,
in the opinion of the Company's management, necessary for a fair presentation
of the Company's results for the periods presented. Certain information and
footnote disclosures normally included in financial statements prepared in
accordance with generally accepted accounting principles have been condensed or
omitted pursuant to such rules and regulations, although the Company believes
that the disclosures are adequate to make the information presented herein not
misleading. Certain prior period amounts have been reclassified for comparative
purposes.

2.  ACQUISITION OF PAULSBORO REFINERY

         On September 16, 1998, the Company and Mobil Oil Corporation ("Mobil")
entered into an asset sale and purchase agreement for the acquisition by the
Company of substantially all of the assets and the assumption of certain
liabilities related to Mobil's 155,000 barrel-per-day ("BPD") refinery in
Paulsboro, New Jersey ("Paulsboro Refinery"). The acquisition was accounted for
using the purchase method of accounting and the purchase price was allocated to
the assets acquired and liabilities assumed based on estimated fair values,
pending the completion of an independent appraisal. Pursuant to the purchase
method of accounting, the accompanying Consolidated Statements of Income for
the three months ended and six months ended June 30, 1998 do not include the
results of operations of the Paulsboro Refinery.

         Pursuant to the asset sale and purchase agreement, Mobil is entitled
to receive payments in any of the five years following the acquisition if
certain average refining margins during any of such years exceed a specified
level. Any payments under this earn-out arrangement, which will be determined
in September of each year beginning in 1999, are limited to $20 million in any
year and $50 million in the aggregate.

         In connection with the acquisition of the Paulsboro Refinery, Mobil
agreed to indemnify the Company for certain environmental matters and
conditions existing on or prior to the acquisition and the Company agreed to
assume Mobil's environmental liabilities, with certain limited exceptions
(including "superfund" liability for off-site waste disposal). Mobil's
indemnities and the periods of indemnification include (i) third party
environmental claims for a period of five years, (ii) governmental fines and/or
penalties for a period of five years, (iii) required remediation of known
environmental conditions for a period of five years, subject to a cumulative
deductible, (iv) required remediation of unknown environmental conditions for a
period of seven years, subject to a sharing arrangement with a cap on the
Company's obligation and subject to a cumulative deductible, and (v) certain
capital expenditures required by a governmental entity for a three-year period,
to the extent required to cure a breach of certain representations of Mobil
concerning compliance with environmental laws, subject to a specified
deductible. The Company's assumed liabilities include remediation obligations
to the New Jersey Department of Environmental Protection. These remediation
obligations relate primarily to clean-up costs associated with groundwater
contamination, landfill closure and post-closure monitoring costs, and tank
farm spill prevention costs. As of June 30, 1999, the



                                       6
<PAGE>   7

                  VALERO ENERGY CORPORATION AND SUBSIDIARIES

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)


Company has recorded approximately $20 million in Accrued Expenses and Deferred
Credits and Other Liabilities representing its best estimate of costs to be
borne by the Company related to these remediation obligations. The majority of
such costs are expected to be incurred in relatively level amounts over the
next 20 years.

         The following unaudited pro forma financial information of the Company
for the six months ended June 30, 1998 assumes that the acquisition of the
Paulsboro Refinery occurred at the beginning of such period. Such pro forma
information is not necessarily indicative of the results of future operations.
(Dollars in thousands, except per share amounts.)

<TABLE>
<S>                                                                                        <C>
     Operating revenues.............................................................       $3,329,658
     Operating income...............................................................           97,373
     Net income.....................................................................           49,490
     Earnings per common share......................................................              .88
     Earnings per common share - assuming dilution..................................              .86
</TABLE>

3.  INVENTORIES

         Refinery feedstocks and refined products and blendstocks are carried
at the lower of cost or market, with the cost of feedstocks purchased for
processing and produced products determined under the last-in, first-out
("LIFO") method of inventory pricing, and the cost of feedstocks and products
purchased for resale determined under the weighted average cost method. During
the first quarter of 1999, LIFO inventory quantities were reduced causing prior
year LIFO costs, which were lower than current year replacement costs, to be
charged to cost of sales. This LIFO liquidation resulted in a decrease in cost
of sales of $10.5 million and a decrease in the net loss of $6.8 million, or
$.12 per share, for the first six months of 1999. At June 30, 1999, the
replacement cost of the Company's LIFO inventories exceeded their LIFO carrying
values by approximately $92 million. Materials and supplies are carried
principally at weighted average cost not in excess of market. Inventories as of
June 30, 1999 and December 31, 1998 were as follows (in thousands):

<TABLE>
<CAPTION>
                                                      June 30,       December 31,
                                                        1999             1998
                                                     ---------       ------------

<S>                                                  <C>              <C>
     Refinery feedstocks ....................        $  67,881        $  80,036
     Refined products and blendstocks .......          200,743          174,125
     Materials and supplies .................           60,988           62,244
                                                     ---------        ---------
                                                     $ 329,612        $ 316,405
                                                     =========        =========
</TABLE>



                                       7
<PAGE>   8


                  VALERO ENERGY CORPORATION AND SUBSIDIARIES

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)


4.  STATEMENTS OF CASH FLOWS

         In order to determine net cash provided by operating activities, net
income (loss) has been adjusted by, among other things, changes in current
assets and current liabilities. The changes in the Company's current assets and
current liabilities are shown in the following table as an (increase)/decrease
in current assets and an increase/(decrease) in current liabilities (in
thousands). These amounts exclude, among other things, a $37.7 million noncash
write-down of inventory to market value in the first quarter of 1998 and
changes in cash and temporary cash investments, current deferred income tax
assets and short-term debt.

<TABLE>
<CAPTION>
                                                     Six Months Ended
                                                         June 30,
                                                --------------------------
                                                   1999             1998
                                                ---------         --------

<S>                                             <C>               <C>
     Receivables, net ..................        $ (18,966)        $ 43,672
     Inventories .......................          (14,080)           4,757
     Prepaid expenses and other ........            3,440            3,107
     Accounts payable ..................          138,500          (21,157)
     Accrued expenses ..................            5,578          (16,926)
                                                ---------         --------
        Total ..........................        $ 114,472         $ 13,453
                                                =========         ========
</TABLE>

         Cash flows related to interest and income taxes were as follows (in
thousands):

<TABLE>
<CAPTION>
                                                                   Six Months Ended
                                                                      June 30,
                                                               ------------------------
                                                                 1999            1998
                                                               --------        --------

<S>                                                            <C>             <C>
     Interest paid (net of amount capitalized) ........        $ 20,536        $ 13,390
     Income tax refunds received ......................           7,505           9,000
     Income taxes paid ................................             531           5,282
</TABLE>

         Noncash investing activities for the six months ended June 30, 1998
included various adjustments to property, plant and equipment and certain
current assets and current liabilities resulting from the completion of an
independent appraisal performed in connection with the May 1997 acquisition of
Basis Petroleum, Inc. ("Basis") and the allocation of the Basis purchase price
to the assets acquired and liabilities assumed.

5.  LONG-TERM DEBT

         In March 1999, the Company completed a public offering of $300 million
principal amount of 7 3/8% notes which are due on March 15, 2006. The notes
were issued under the Company's $600 million universal shelf registration
statement which was previously declared effective by the SEC on June 30, 1998.
Net proceeds from the financing of approximately $297.5 million were used to
pay down borrowings under the Company's revolving bank credit facility.

         Also in March 1999, the Company refinanced $25 million of its Series
1998 taxable, variable rate Waste Disposal Revenue Bonds with tax-exempt bonds.
These Series 1999 tax-exempt bonds have a fixed interest rate of 5.7% and
mature on April 1, 2032.




                                       8
<PAGE>   9


                   VALERO ENERGY CORPORATION AND SUBSIDIARIES

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)


6. EARNINGS PER SHARE

         The computation of basic and diluted per-share amounts, as required by
the Financial Accounting Standards Board's ("FASB") Statement of Financial
Accounting Standards ("SFAS") No. 128, is as follows (dollars and shares in
thousands, except per share amounts):

<TABLE>
<CAPTION>
                                                               Three Months Ended June 30,
                                            -----------------------------------------------------------------
                                                         1999                               1998
                                            -----------------------------        ----------------------------
                                                                    Per-                                Per-
                                             Net                    Share        Net                    Share
                                            (Loss)       Shares      Amt.        Income     Shares       Amt.
                                            ------       ------      ----        ------     ------       ----

<S>                                         <C>          <C>        <C>         <C>         <C>         <C>
Net income (loss).........................  $(22,085)                           $ 39,939
                                            ========                            ========

BASIC EARNINGS PER SHARE:
Net income (loss) available to
  common stockholders.....................  $(22,085)     56,162     $(.39)     $ 39,939     56,201      $ .71
                                                                     =====                               =====

EFFECT OF DILUTIVE SECURITIES:
Stock options.............................     --          --                     --          1,038
Performance awards........................     --          --                     --            114
                                            --------    --------                --------     ------

DILUTED EARNINGS PER SHARE:
Net income (loss) available to
  common stockholders
  plus assumed conversions................  $(22,085)     56,162     $(.39)     $ 39,939     57,353      $ .70
                                            ========     =======     =====      ========     ======      =====
</TABLE>


<TABLE>
<CAPTION>
                                                                Six Months Ended June 30,
                                            ------------------------------------------------------------------
                                                          1999                              1998
                                            -----------------------------        -----------------------------
                                                                    Per-                                Per-
                                              Net                   Share        Net                    Share
                                            (Loss)       Shares      Amt.        Income     Shares       Amt.
                                            ------       ------      ----        ------     ------       ----

<S>                                         <C>          <C>        <C>         <C>         <C>         <C>
Net income (loss).........................  $(24,801)                           $ 34,055
                                            ========                            ========

BASIC EARNINGS PER SHARE:
Net income (loss) available to
  common stockholders.....................  $(24,801)     56,109     $(.44)      $34,055     56,175     $ .61
                                                                     =====                              =====

EFFECT OF DILUTIVE SECURITIES:
Stock options.............................     --          --                      --         1,034
Performance awards........................     --          --                      --           110
                                            --------    --------                --------     ------

DILUTED EARNINGS PER SHARE:
Net income (loss) available to
  common stockholders
  plus assumed conversions................  $(24,801)     56,109     $(.44)     $ 34,055     57,319     $ .59
                                            ========     =======     =====      ========     ======     =====
</TABLE>



                                       9
<PAGE>   10

                   VALERO ENERGY CORPORATION AND SUBSIDIARIES

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)


         Because the Company reported a net loss for the three months and six
months ended June 30, 1999, various stock options and performance awards which
were granted to employees in connection with the Company's stock compensation
plans and were outstanding during such periods were not included in the
computation of diluted earnings per share because the effect would have been
antidilutive. At June 30, 1999, options to purchase approximately 6.4 million
common shares and performance awards totaling approximately 317,000 common
shares were outstanding.

7.  NEW ACCOUNTING PRONOUNCEMENTS

         In March 1998, the American Institute of Certified Public Accountants
("AICPA") issued Statement of Position ("SOP") No. 98-1, "Accounting for the
Costs of Computer Software Developed or Obtained for Internal Use." This SOP
provides guidance for determining when to capitalize or expense costs incurred
to develop or obtain internal-use software. This statement became effective for
the Company's financial statements beginning January 1, 1999, with its
requirements applied to costs incurred on or after such date. The adoption of
this SOP did not have a material effect on the Company's consolidated financial
statements.

         In June 1998, the FASB issued SFAS No. 133, "Accounting for Derivative
Instruments and Hedging Activities." SFAS No. 133 establishes accounting and
reporting standards requiring that every derivative instrument (including
certain derivative instruments embedded in other contracts) be recorded in the
balance sheet as either an asset or liability measured at its fair value. The
statement requires that changes in a derivative's fair value be recognized
currently in earnings unless specific hedge accounting criteria are met.
Special accounting for qualifying hedges allows a derivative's gains and losses
to offset related results on the hedged item in the income statement, and
requires that a company must formally document, designate, and assess the
effectiveness of transactions that receive hedge accounting. As issued, this
statement was to become effective for the Company's financial statements
beginning January 1, 2000. However, in June 1999, the FASB issued SFAS No. 137
which delayed for one year the effective date of SFAS No. 133. As a result,
SFAS No. 133 will become effective for the Company's financial statements
beginning January 1, 2001 and is not allowed to be applied retroactively to
financial statements of prior periods. At such effective date, SFAS No. 133
must be applied to (i) all freestanding derivative instruments and (ii) all
embedded derivative instruments required by the statement to be separated from
their host contracts (or, at the Company's election, only those derivatives
embedded in hybrid instruments issued, acquired or substantively modified on or
after January 1, 1998 or January 1, 1999). The Company is currently evaluating
the impact on its financial statements of adopting this statement. Adoption of
this statement could result in increased volatility in the Company's earnings
and other comprehensive income.

8.  LITIGATION AND CONTINGENCIES

         Prior to July 31, 1997, Valero was a wholly owned subsidiary of Valero
Energy Corporation ("Energy"). Energy was engaged in both the refining and
marketing business and the natural gas related services business. On July 31,
1997, Energy spun off Valero to Energy's stockholders and merged its remaining
natural gas related services business with a wholly owned subsidiary of PG&E
Corporation ("PG&E") (the "Restructuring"). Energy and certain of its natural
gas related subsidiaries, as well as the Company, have been sued by Teco
Pipeline Company ("Teco") regarding the operation of the 340-mile



                                      10
<PAGE>   11

                   VALERO ENERGY CORPORATION AND SUBSIDIARIES

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (CONTINUED)


West Texas pipeline in which a subsidiary of Energy holds a 50% undivided
interest. In 1985, a subsidiary of Energy sold a 50% undivided interest in the
pipeline and entered into a joint venture through an ownership agreement and an
operating agreement, each dated February 28, 1985, with the purchaser of the
interest. In 1988, Teco succeeded to that purchaser's 50% interest. A
subsidiary of Energy has at all times been the operator of the pipeline.
Notwithstanding the written ownership and operating agreements, the plaintiff
alleges that a separate, unwritten partnership agreement exists, and that the
defendants have exercised improper dominion over such alleged partnership's
affairs. The plaintiff also alleges that the defendants acted in bad faith by
negatively affecting the economics of the joint venture in order to provide
financial advantages to facilities or entities owned by the defendants and by
allegedly usurping for the defendants' own benefit certain opportunities
available to the joint venture. The plaintiff asserts causes of action for
breach of fiduciary duty, fraud, tortious interference with business
relationships, professional malpractice and other claims, and seeks
unquantified actual and punitive damages. Energy's motion to compel arbitration
was denied, but Energy has filed an appeal. Energy has also filed a
counterclaim alleging that the plaintiff breached its own obligations to the
joint venture and jeopardized the economic and operational viability of the
pipeline by its actions. Energy is seeking unquantified actual and punitive
damages. Although PG&E previously acquired Teco and now owns both Teco and
Energy, PG&E's Teco acquisition agreement purports to assign the benefit or
detriment of this lawsuit to the former shareholders of Teco. Pursuant to the
agreement by which the Company was spun off to Energy's stockholders in
connection with the Restructuring, the Company has agreed to indemnify Energy
with respect to this lawsuit to the extent of 50% of the amount of any final
judgment or settlement amount not in excess of $30 million, and 100% of that
part of any final judgment or settlement amount in excess of $30 million.

         The Company is also a party to additional claims and legal proceedings
arising in the ordinary course of business. The Company believes it is unlikely
that the final outcome of any of the claims or proceedings to which the Company
is a party would have a material adverse effect on the Company's financial
statements; however, due to the inherent uncertainty of litigation, the range
of possible loss, if any, cannot be estimated with a reasonable degree of
precision and there can be no assurance that the resolution of any particular
claim or proceeding would not have an adverse effect on the Company's results
of operations for the interim period in which such resolution occurred.

9.  SUBSEQUENT EVENTS

         On July 29, 1999, the Company's Board of Directors declared a regular
quarterly cash dividend of $.08 per common share payable September 8, 1999, to
holders of record at the close of business on August 11, 1999.




                                      11
<PAGE>   12


ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
         OF OPERATIONS


RESULTS OF OPERATIONS

SECOND QUARTER 1999 COMPARED TO SECOND QUARTER 1998

     FINANCIAL HIGHLIGHTS (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)


<TABLE>
<CAPTION>
                                                                                 Three Months Ended June 30,
                                                           ------------------------------------------------------------------
                                                                                                                Change
                                                                                                     ------------------------
                                                               1999               1998 (1)             Amount             %
                                                           ------------         ------------         ----------         -----

<S>                                                        <C>                  <C>                  <C>                   <C>
     Operating revenues ...........................        $  1,824,450         $  1,448,104         $  376,346            26%
     Cost of sales ................................          (1,680,888)          (1,234,326)          (446,562)          (36)
     Operating costs:
         Cash (fixed and variable) ................            (115,098)            (102,818)           (12,280)          (12)
         Depreciation and amortization ............             (33,738)             (27,504)            (6,234)          (23)
     Selling and administrative expenses (including
         related depreciation expense) ............             (15,459)             (19,132)             3,673            19
                                                           ------------         ------------         ----------
             Total operating income (loss) ........        $    (20,733)        $     64,324         $  (85,057)         (132)
                                                           ============         ============         ==========

     Other income, net ............................        $      1,066         $        482         $      584           121
     Interest and debt expense, net ...............        $    (14,518)        $     (7,167)        $   (7,351)         (103)
     Income tax (expense) benefit .................        $     12,100         $    (17,700)        $   29,800           168
     Net income (loss) ............................        $    (22,085)        $     39,939         $  (62,024)         (155)
     Earnings (loss) per share of common stock -
         assuming dilution ........................        $       (.39)        $        .70         $    (1.09)         (156)

     Earnings before interest, taxes, depreciation
         and amortization ("EBITDA") ..............        $     15,129         $     93,299         $  (78,170)          (84)
     Ratio of EBITDA to interest incurred .........                 .9x                11.3x            (10.4)x           (92)
</TABLE>


- ---------
(1)  Excludes the operations of the Paulsboro Refinery which commenced
     September 17, 1998.



                                      12
<PAGE>   13



                              OPERATING HIGHLIGHTS

<TABLE>
<CAPTION>
                                                                Three Months Ended June 30,
                                                       -----------------------------------------------
                                                                                         Change
                                                                                 ---------------------
                                                        1999        1998 (1)      Amount          %
                                                       -------      -------      -------       -------

<S>                                                    <C>          <C>          <C>           <C>
Sales volumes (Mbbls per day) ....................       1,037          873          164            19%
Throughput volumes (Mbbls per day) ...............         716(2)       550          166            30
Average throughput margin per barrel .............     $  2.20      $  4.27      $ (2.07)          (48)
Operating costs per barrel:
    Cash (fixed and variable) ....................     $  1.76      $  2.05      $  (.29)          (14)
    Depreciation and amortization ................         .52          .55         (.03)           (5)
                                                       -------      -------      -------
        Total operating costs per barrel .........     $  2.28      $  2.60      $  (.32)          (12)
                                                       =======      =======      =======

Charges:
    Crude oils:
        Sour .....................................          43%          29%          14%           48%
        Heavy sweet ..............................          16           26          (10)          (38)
        Light sweet ..............................           9           13           (4)          (31)
                                                       -------      -------      -------
            Total crude oils .....................          68           68          --             --
    High-sulfur residual fuel oil ("resid") ......           3           11           (8)          (73)
    Low-sulfur resid .............................           7            1            6           600
    Other feedstocks and blendstocks .............          22           20            2            10
                                                       -------      -------      -------
        Total charges ............................         100%         100%         -- %           --
                                                       =======      =======      =======

Yields:
    Gasolines and blendstocks ....................          53%          54%          (1)%          (2)%
    Distillates ..................................          28           28          --             --
    Petrochemicals ...............................           4            4          --             --
    Lubes and asphalts ...........................           3          --             3            --
    Other products ...............................          12           14           (2)          (14)
                                                       -------      -------      -------
        Total yields .............................         100%         100%         -- %           --
                                                       =======      =======      =======
</TABLE>

               AVERAGE MARKET REFERENCE PRICES AND DIFFERENTIALS
                    (U.S. GULF COAST) (DOLLARS PER BARREL)


<TABLE>
<CAPTION>
                                                                       Three Months Ended June 30,
                                                               -----------------------------------------------
                                                                                                   Change
                                                                                            ------------------
                                                                 1999            1998        Amount        %
                                                               ---------      ---------     --------      ----

<S>                                                           <C>            <C>            <C>             <C>
Feedstocks:
    West Texas Intermediate ("WTI") crude oil .........        $   17.63      $   14.65     $   2.98        20%
    WTI less sour crude oil (Arab medium) (3) .........        $    2.85      $    3.92     $  (1.07)      (27)
    WTI less heavy sweet crude oil (Cabinda) (3) ......        $    1.29      $     .94     $    .35        37
    WTI less high-sulfur resid (Singapore) (3) ........        $    2.36      $    1.33     $   1.03        77

Products:
    Conventional 87 gasoline less WTI .................        $    2.85      $    4.75     $  (1.90)      (40)
    No. 2 fuel oil less WTI ...........................        $    (.62)     $    1.76     $  (2.38)     (135)
    Propylene less WTI ................................        $   (1.90)     $    1.47     $  (3.37)     (229)
</TABLE>


- ---------
(1)  Excludes the operations of the Paulsboro Refinery which commenced
     September 17, 1998.
(2)  Includes 177 Mbbls per day related to the Paulsboro Refinery.
(3)  Excludes $.25 to $.50 per barrel for other delivery-related costs into the
     Company's refineries.



                                      13
<PAGE>   14


         The Company reported a net loss for the second quarter of 1999 of
$22.1 million, or $.39 per share, compared to net income of $40.0 million, or
$.70 per share, for the second quarter of 1998. The decline in second quarter
results was due primarily to exceptionally weak refining industry fundamentals
in the 1999 period which resulted in the lowest refining margins in over 15
years, and, to a lesser extent, to increased interest expense. Partially
offsetting the decreases in income resulting from these factors were
significant reductions in cash operating costs (excluding the effect of the
Paulsboro Refinery which was acquired in September 1998) and selling and
administrative expenses resulting from the Company's comprehensive cost
reduction efforts.

         Operating revenues increased $376.3 million, or 26%, to $1.8 billion
during the second quarter of 1999 compared to the same period in 1998 due to a
19% increase in average daily sales volumes and a $1.10, or 6%, increase in the
average sales price per barrel. The increase in sales volumes was due to
additional volumes attributable to the acquisition of the Paulsboro Refinery.
The increase in sales prices was attributable primarily to markedly higher
crude oil prices resulting from a decision by OPEC in March 1999 to reduce
crude oil production. However, refined product prices did not increase as much
as crude oil prices due to above-average refined product inventory levels.
Inventories continued to be at above-average levels due to high refinery
utilization rates, higher gasoline imports and weak distillate demand.

         Operating income decreased $85.1 million during the second quarter of
1999 compared to the second quarter of 1998 resulting in an operating loss in
the 1999 period of $20.7 million. This decrease in operating income was due
primarily to an approximate $70 million decrease in total throughput margins.
Also contributing to the decrease in operating income was the inclusion in the
1999 quarter of approximately $31 million of operating costs attributable to
the Paulsboro Refinery. Partially offsetting these decreases was an approximate
$13 million decrease in operating costs for all refineries exclusive of the
Paulsboro Refinery, as well as an approximate $4 million decrease in selling
and administrative expenses (including related depreciation expense), resulting
mainly from a Company-wide effort to reduce costs.

         Total throughput margins were negatively affected, both in total and
on a per-barrel basis, by (i) significantly lower gasoline and distillate
margins (average distillate margins were negative in the 1999 second quarter)
resulting primarily from the change in crude oil prices noted above in the
discussion of operating revenues, and (ii) lower petrochemical margins
resulting from continuing depressed demand for petrochemical feedstocks due to
the Asian economic crisis. Total throughput margins were also negatively
affected by an approximate $19 million decrease in benefits from the Company's
price risk management program, including an approximate $7 million decrease in
results from trading activities. Partially offsetting the effects of the above
factors was a positive contribution to total throughput margins from the
Paulsboro Refinery.

         The above-noted decrease in operating costs for all refineries
exclusive of the Paulsboro Refinery was due to a $16 million decrease in cash
operating expenses resulting mainly from lower maintenance, fuel and other
costs, partially offset by a $3 million increase in depreciation expense and
amortization of deferred turnaround and catalyst costs.

         Net interest and debt expense increased $7.4 million to $14.5 million
during the second quarter of 1999 compared to the same period in 1998 due
primarily to an increase in borrowings resulting from the acquisition of the
Paulsboro Refinery.

         Income taxes decreased $29.8 million, from a $17.7 million expense
during the second quarter of 1998 to a $12.1 million benefit during the second
quarter of 1999, due primarily to the decrease in pre-tax income.


                                      14
<PAGE>   15

YEAR-TO-DATE 1999 COMPARED TO YEAR-TO-DATE 1998

     FINANCIAL HIGHLIGHTS (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)


<TABLE>
<CAPTION>
                                                                                 Six Months Ended June 30,
                                                          ----------------------------------------------------------------------
                                                                                                                Change
                                                                                                    ----------------------------
                                                              1999               1998 (1)             Amount               %
                                                          ------------         ------------         ----------          --------

<S>                                                       <C>                  <C>                  <C>                 <C>
Operating revenues ....................................   $  3,161,553         $  2,810,463         $  351,090               12%
Cost of sales .........................................     (2,835,848)          (2,422,102)          (413,746)             (17)
Operating costs:
    Cash (fixed and variable) .........................       (234,540)            (199,582)           (34,958)             (18)
    Depreciation and amortization .....................        (68,865)             (52,443)           (16,422)             (31)
Selling and administrative expenses (including
    related depreciation expense) .....................        (34,513)             (36,756)             2,243                6
                                                          ------------         ------------         ----------
Operating income (loss), before inventory
    write-down ........................................        (12,213)              99,580           (111,793)            (112)
Write-down of inventories to market value .............           --                (37,673)            37,673              100
                                                          ------------         ------------         ----------
    Total operating income (loss) .....................   $    (12,213)        $     61,907         $  (74,120)            (120)
                                                          ============         ============         ==========

Other income, net .....................................   $        987         $        437         $      550              126
Interest and debt expense, net ........................   $    (26,975)        $    (13,989)        $  (12,986)             (93)
Income tax (expense) benefit ..........................   $     13,400         $    (14,300)        $   27,700              194
Net income (loss) .....................................   $    (24,801)        $     34,055         $  (58,856)            (173)
Earnings (loss) per share of common stock -
    assuming dilution .................................   $       (.44)        $        .59         $    (1.03)            (175)

Earnings before interest, taxes, depreciation
    and amortization ("EBITDA") .......................   $     60,240         $    154,057(2)      $  (93,817)             (61)
Ratio of EBITDA to interest incurred ..................            2.0x                 9.7x              (7.7)x            (79)
</TABLE>

- ---------
(1)  Excludes the operations of the Paulsboro Refinery which commenced
     September 17, 1998.
(2)  Excludes the $37.7 million pre-tax write-down of inventories to market
     value.



                                      15
<PAGE>   16

                              OPERATING HIGHLIGHTS

<TABLE>
<CAPTION>
                                                                         Six Months Ended June 30,
                                                          -----------------------------------------------------------
                                                                                                     Change
                                                                                            -------------------------
                                                            1999            1998 (1)         Amount              %
                                                          -------           --------        -------           -------

<S>                                                       <C>               <C>             <C>               <C>
Sales volumes (Mbbls per day) ....................          1,043               845             198               23%
Throughput volumes (Mbbls per day) ...............            707(2)            539             168               31
Average throughput margin per barrel .............        $  2.54           $  3.98(3)      $ (1.44)             (36)
Operating costs per barrel:
    Cash (fixed and variable) ....................        $  1.83           $  2.05         $  (.22)             (11)
    Depreciation and amortization ................            .54               .54            --               --
                                                          -------           -------         -------
        Total operating costs per barrel .........        $  2.37           $  2.59         $  (.22)              (8)
                                                          =======           =======         =======

Charges:
    Crude oils:
        Sour .....................................             47%               31%             16%              52%
        Heavy sweet ..............................             14                21              (7)             (33)
        Light sweet ..............................             10                13              (3)             (23)
                                                          -------           -------         -------
            Total crude oils .....................             71                65               6                9
    High-sulfur resid ............................              3                11              (8)             (73)
    Low-sulfur resid .............................              6                 3               3              100
    Other feedstocks and blendstocks .............             20                21              (1)              (5)
                                                          -------           -------         -------
        Total charges ............................            100%              100%           --  %            --
                                                          =======           =======         =======

Yields:
    Gasolines and blendstocks ....................             52%               54%             (2)%             (4)
    Distillates ..................................             29                28               1                4
    Petrochemicals ...............................              4                 4            --               --
    Lubes and asphalts ...........................              3              --                 3             --
    Other products ...............................             12                14              (2)             (14)
                                                          -------           -------         -------
        Total yields .............................            100%              100%           --  %            --
                                                          =======           =======         =======
</TABLE>


               AVERAGE MARKET REFERENCE PRICES AND DIFFERENTIALS
                    (U.S. GULF COAST) (DOLLARS PER BARREL)


<TABLE>
<CAPTION>
                                                                            Six Months Ended June 30,
                                                               -------------------------------------------------
                                                                                                   Change
                                                                                            --------------------
                                                                 1999            1998        Amount          %
                                                               ---------      ---------     --------      ------

<S>                                                            <C>            <C>           <C>          <C>
Feedstocks:
    WTI crude oil .....................................        $   15.34      $   15.30     $    .04       -- %
    WTI less sour crude oil (Arab medium) (4) .........        $    2.95      $    3.58     $   (.63)      (18)
    WTI less heavy sweet crude oil (Cabinda) (4) ......        $    1.13      $    1.29     $   (.16)      (12)
    WTI less high-sulfur resid (Singapore) (4) ........        $    1.68      $    2.59     $   (.91)      (35)

Products:
    Conventional 87 gasoline less WTI .................        $    2.26      $    3.78     $  (1.52)      (40)
    No. 2 fuel oil less WTI ...........................        $    (.16)     $    1.77     $  (1.93)     (109)
    Propylene less WTI ................................        $   (1.10)     $    2.68     $  (3.78)     (141)
</TABLE>


- ---------
(1)  Excludes the operations of the Paulsboro Refinery which commenced
     September 17, 1998.
(2)  Includes 175 Mbbls per day related to the Paulsboro Refinery.
(3)  Excludes a $.39 per barrel reduction resulting from the effect of the
     $37.7 million pre-tax write-down of inventories to market value.
(4)  Excludes $.25 to $.50 per barrel for other delivery-related costs into the
     Company's refineries.



                                      16
<PAGE>   17

          The Company reported a net loss for the first six months of 1999 of
$24.8 million, or $.44 per share, compared to net income of $34.1 million, or
$.59 per share, for the first six months of 1998. The results for the 1998
period were reduced by a $37.7 million ($23.9 million after-tax) write-down in
the carrying amount of the Company's refinery inventories resulting from a
significant decline in feedstock and refined product prices during the 1998
first quarter. Excluding the effect of the 1998 inventory write-down, results
for the first six months of 1999 were significantly below 1998 levels for the
same period due primarily to extremely weak refining industry fundamentals in
the 1999 period, the effect of significant downtime at the Company's Corpus
Christi refinery in early 1999 due to a major maintenance turnaround and
expansion of the heavy oil cracker and related units, and increased interest
expense. Partially offsetting the decreases in income resulting from these
factors were significant reductions in cash operating costs (excluding the
effect of the Paulsboro Refinery which was acquired in September 1998) and
selling and administrative expenses resulting from the Company's comprehensive
cost reduction efforts, increased benefits from the Company's price risk
management activities, and a benefit to income related to a permanent reduction
in LIFO inventories during the first quarter of 1999 (see Note 3 of Notes to
Consolidated Financial Statements).

         Operating revenues increased $351.1 million, or 12%, to $3.2 billion
during the first six months of 1999 compared to the same period in 1998 due to
a 23% increase in average daily sales volumes, partially offset by a $1.62, or
9%, decrease in the average sales price per barrel. The increase in sales
volumes was due primarily to additional volumes attributable to the September
1998 acquisition of the Paulsboro Refinery, while the decrease in sales prices
was due to the industry's high level of refined product inventories which
resulted in depressed refined product prices.

         Excluding the effect of the $37.7 million inventory write-down in the
first six months of 1998 described above, operating income decreased $111.8
million during the first six months of 1999 compared to the same period in 1998
resulting in an operating loss in the 1999 period of $12.2 million. This
decrease in operating income was due primarily to an approximate $63 million
decrease in total throughput margins, approximately $66 million of operating
costs attributable to the Paulsboro Refinery in the 1999 period, and a $9
million increase in depreciation expense and amortization of deferred
turnaround and catalyst costs for all refineries exclusive of the Paulsboro
Refinery. Partially offsetting these decreases was an approximate $24 million
reduction in cash operating costs for all refineries exclusive of the Paulsboro
Refinery resulting mainly from lower maintenance and fuel costs as well as
other cost-reduction efforts, and an approximate $2 million decrease in selling
and administrative expenses (including related depreciation expense) due mainly
to Company-wide cost reduction initiatives.

         Total throughput margins were negatively affected, both in total and
on a per-barrel basis, by (i) significantly lower gasoline and distillate
margins resulting primarily from the depressed refined product prices noted
above and higher crude oil prices attributable to OPEC production cuts
announced in March 1999, (ii) a decrease in feedstock discounts relative to
WTI, and (iii) lower petrochemical margins resulting from continuing depressed
demand for petrochemical feedstocks due to the Asian economic crisis. The
negative effect on throughput margins resulting from the changes in gasoline
and distillate margins and feedstock discounts was partially offset by a
positive contribution from the Paulsboro Refinery in the 1999 period, an
approximate $15 million increase in benefits from the Company's price risk
management program, including an approximate $6 million increase in gains from
trading activities, and a $10.5 million benefit resulting from the liquidation
of LIFO inventories in the 1999 period.

         Net interest and debt expense increased $13.0 million, or 93%, to
$27.0 million during the first six months of 1999 compared to the same period
in 1998 due primarily to an increase in borrowings resulting from the
acquisition of the Paulsboro Refinery in September 1998.



                                      17
<PAGE>   18


         Income taxes decreased $27.7 million, from a $14.3 million expense
during the first six months of 1998 to a $13.4 million benefit during the same
period in 1999, due primarily to a decrease in pre-tax income.

OUTLOOK

         Thus far in the third quarter of 1999, gasoline margins have improved
significantly from second quarter levels, rising above average historical
levels, and are in excess of third quarter 1998 margins. This improvement has
been due to a decline in gasoline inventories resulting from strong demand and
a moderation of refinery utilization rates and European imports. Heating oil
margins, although still below historical averages and third quarter 1998
levels, have recovered substantially from the negative margins in the 1999
second quarter and are approaching third quarter 1998 margins due to declining
inventories resulting from reduced production. If these trends continue, and
combined with anticipated benefits from the Company's cost-cutting initiatives
begun earlier in 1999, earnings for the third quarter of 1999 should be
significantly higher than earnings reported for the third quarter of 1998.

LIQUIDITY AND CAPITAL RESOURCES

         Net cash provided by operating activities was $147.9 million during
the first six months of 1999, a $5.2 million increase compared to the same
period in 1998. The net cash provided by operating activities for the 1999
period was achieved primarily through a $114.5 million decrease in the amount
of cash utilized for working capital purposes, as detailed in Note 4 of Notes
to Consolidated Financial Statements. In the first six months of 1999, both
accounts receivable and accounts payable increased due to a significant
increase in commodity prices from December 31, 1998 to June 30, 1999. Combined
with concerted efforts by the Company during such period to collect accounts
receivable, which helped reduce the increase in receivables resulting from
higher commodity prices, the Company realized a net decrease in cash utilized
for working capital purposes. Included in the changes in current assets and
current liabilities for the 1998 period was a decrease in both accounts
receivable and accounts payable due primarily to a reduction in commodity
prices from December 31, 1997 to June 30, 1998. During the first six months of
1999, cash provided by operating activities, proceeds from the issuance of the
7 3/8% notes described in Note 5 of Notes to Consolidated Financial Statements
(approximately $298 million) and a portion of existing cash balances were
utilized to reduce bank borrowings, fund capital expenditures and deferred
turnaround and catalyst costs, and pay common stock dividends.

         The Company currently maintains an unsecured $835 million revolving
bank credit and letter of credit facility that matures in November 2002 and is
available for general corporate purposes including working capital needs and
letters of credit. Borrowings under this facility bear interest at either LIBOR
plus a margin, a base rate or a money market rate. The Company is also charged
various fees and expenses in connection with this facility, including a
facility fee and various letter of credit fees. The interest rate and fees
under the credit facility are subject to adjustment based upon the credit
ratings assigned to the Company's long-term debt. The credit facility includes
certain restrictive covenants including a coverage ratio, a capitalization
ratio, and a minimum net worth test. As of June 30, 1999, outstanding
borrowings and letters of credit under this committed bank credit and letter of
credit facility totaled approximately $295 million. The Company also has
uncommitted short-term bank credit facilities under which amounts up to $130
million may be borrowed, along with uncommitted bank letter of credit
facilities totaling $285 million. As of June 30, 1999, $31 million was
outstanding under the short-term bank credit facilities, and letters of credit
totaling approximately $48 million were outstanding under the uncommitted
letter of credit facilities. As of June 30, 1999, the Company's debt to
capitalization ratio was 47.3%.



                                      18
<PAGE>   19


         During the first six months of 1999, the Company reduced its exposure
to increases in interest rates and increased its financial flexibility by (i)
issuing $300 million of seven-year 7 3/8% notes under its $600 million shelf
registration statement and using the net proceeds to reduce variable rate bank
borrowings and (ii) refinancing $25 million of its taxable, variable rate
industrial revenue bonds with tax-exempt 5.7% fixed rate bonds. See Note 5 of
Notes to Consolidated Financial Statements.

         As described in Note 2 of Notes to Consolidated Financial Statements,
Mobil is entitled to receive payments from the Company in any of the five years
following the Company's September 1998 acquisition of the Paulsboro Refinery if
certain average refining margins during any of such years exceed a specified
level. Based on margin levels since the acquisition date, no earn-out payments
are currently anticipated to be made to Mobil in 1999.

         During the first six months of 1999, the Company expended
approximately $111 million for capital investments, including capital
expenditures of $58 million and deferred turnaround and catalyst costs of $53
million. The deferred turnaround and catalyst costs related primarily to (i) a
major maintenance turnaround of the heavy oil cracker and related units at the
Corpus Christi refinery in the first quarter, (ii) a catalyst change for the
Corpus Christi hydrodesulfurization unit in the second quarter, and (iii) a
turnaround and catalyst change of the Texas City Residfiner also in the second
quarter. For total year 1999, the Company currently expects to incur
approximately $175 million for capital investments, including approximately
$110 million for capital expenditures and approximately $65 million for
deferred turnaround and catalyst costs. The capital expenditure estimate
includes approximately $20 million for computer system projects and
approximately $10 million for projects related to environmental control and
protection.

         On July 29, 1999, the Company's Board of Directors declared a regular
quarterly cash dividend of $.08 per common share payable September 8, 1999, to
holders of record at the close of business on August 11, 1999.

         The Company believes it has sufficient funds from operations, and to
the extent necessary, from the public and private capital markets and bank
markets, to fund its ongoing operating requirements. The Company expects that,
to the extent necessary, it can raise additional funds from time to time
through equity or debt financings; however, except for borrowings under bank
credit agreements or offerings under its universal shelf registration statement
that may occur from time to time, the Company has no other specific financing
plans.

NEW ACCOUNTING PRONOUNCEMENTS

         As discussed in Note 7 of Notes to Consolidated Financial Statements,
various new financial accounting pronouncements have been issued by the AICPA
and FASB which either became effective for the Company's financial statements
beginning in 1999 or become effective in 2001. Except for SFAS No. 133,
"Accounting for Derivative Instruments and Hedging Activities," for which the
impact has not yet been determined, the adoption of these statements has not
had a material effect on the Company's consolidated financial statements.



                                      19
<PAGE>   20

YEAR 2000 READINESS DISCLOSURE

BACKGROUND

         The transition to January 1, 2000 poses problems for almost all users
of information technology ("IT"). These potential problems result from the fact
that many computer programs created in the past were programmed to identify
calendar dates with only the last two digits of the year. As a result, such
programs are unable to distinguish between the year 1900 and the year 2000,
potentially resulting in miscalculations, malfunctions or failures of such
programs. In addition to its potential effect on computer systems, the century
date change may also result in malfunctions or failures of non-IT equipment
which contain embedded systems with date-sensitive functions. These potential
consequences are generally referred to as the "Year 2000" problem.

STATE OF READINESS

         In 1996, in order to improve business processes, reduce costs,
integrate business information, improve access to such information, and provide
flexibility for ongoing business changes, the Company began the implementation
of new client/server based systems which will run substantially all of the
Company's principal business software applications. These new systems have been
represented as Year 2000 compliant by their respective manufacturers and were
substantially implemented by the end of 1998.

         In order to verify the Year 2000 compliance of the above noted
systems, and address the Year 2000 problem with respect to other IT systems and
non-IT embedded systems, the Company has developed a compliance plan with
respect to those systems and services that are deemed to be critical to the
Company's operations and safety of its employees. This plan is divided into the
following sections, which represent major business areas that are potentially
affected by the Year 2000 problem: Business Systems (includes IT hardware,
software and network systems serving the Company's corporate, refining,
marketing and supply areas); Plant Facilities (includes non-IT embedded systems
such as process control systems and the physical equipment and facilities at
the Company's refineries); and Office Facilities/Aviation (includes telephone,
security and environmental systems and office equipment at the Company's office
facilities and aviation-related equipment and software). Implementation of the
Company's Year 2000 compliance plan is led by a Management Oversight Committee,
which includes members of executive management, and Year 2000 coordinators for
each of the business areas described above. The compliance plan is monitored
weekly by the business area coordinators and progress reported monthly to the
Management Oversight Committee. The compliance plan includes the following
phases and scheduled completion dates:

<TABLE>
<CAPTION>
                                                                                                    Scheduled
                                       Compliance Plan Phase                                    Completion Date
- ----------------------------------------------------------------------------------------        ---------------

<S>                                                                                             <C>
o    Form internal Year 2000 organizations, both at the corporate and refinery level,
         to pursue relevant action plans.                                                            Completed

o    Inventory affected systems and services for all business areas and prioritize
         the importance of each particular system to the Company and its operations
         as either high, medium, or low priority.                                                    Completed (1)

o    Assess the compliance of inventoried items by contacting the vendor or
         manufacturer to determine whether the system is Year 2000 compliant.                        Completed (1)

o    Develop action plans to remediate (fix, replace, or discard) each of the
         non-compliant high and medium priority items (those items believed by
         the Company to have a risk involving the safety of individuals,
</TABLE>




                                      20
<PAGE>   21


<TABLE>
<S>                                                                                             <C>

         significant damage to equipment, the environment, or communications,
         or a significant loss of revenues).                                                         Completed (1)

o    Remediate the non-compliant high and medium priority items by implementing
         the plans developed above.                                                                  8/31/99 (2)

o    Validate Year 2000 compliance by testing, wherever possible, all high and
         medium priority items.                                                                      8/31/99 (2)

o    Develop contingency plans for (i) the most critical high-priority items, even if
         validated as compliant, and (ii) all high and medium priority items that cannot
         be tested.                                                                                  9/30/99 (3)
</TABLE>

- ---------
(1)  Although the Company-wide inventory, assessment and planning phases have
     been completed, other non- compliant items may be discovered during the
     remediation and testing phases.
(2)  The Company currently expects the remediation and testing phases to be
     substantially complete for each of its major business areas by August 31,
     1999. Items for which remediation and/or testing is not expected to be
     complete by such date are anticipated to be remediated and/or tested prior
     to December 31, 1999.
(3)  The Company currently expects that each of its major business areas will
     have substantially completed its contingency plans by September 30, 1999.
     Plans remaining uncompleted at such date will be finalized, and completed
     plans will be refined, during the 1999 fourth quarter.

         The Company currently anticipates that completion of its Year 2000
compliance plan will be performed primarily by Company personnel. However, in
certain cases, outside contractors or consultants have been engaged to assist
in the Company's Year 2000 efforts and may be required in the future.
Presently, no significant IT projects have been delayed due to the
implementation of the Company's Year 2000 compliance plan. The following table
indicates, as of August 5, 1999, the status of the Company's progress in
completing the remediation and testing phases of its compliance plan. The
"Remediated" percentages reported below represent the estimated percentage of
total inventoried items (high, medium and low priority items for Business
Systems and Office Facilities/Aviation, and high and medium priority items for
Plant Facilities) that are now remediated. For Business Systems, the "Tested"
percentage represents the percentage of total inventoried items that are now
tested. However, for Office Facilities/Aviation and Plant Facilities, not all
inventoried items will be tested due to various factors. Therefore, for these
areas, the "Tested" percentage represents a percentage of items to be tested.

<TABLE>
<CAPTION>
                                                                                   Remediated       Tested
                                                                                   ----------       ------

<S>                                                                               <C>            <C>
     Business Systems...........................................................       96%            87%
     Office Facilities/Aviation.................................................       94 (1)        100
     Plant Facilities...........................................................       99             96
</TABLE>

- ---------

(1)  Declined from 96% as disclosed in the Company's first quarter 1999 Form
     10-Q due to the inclusion of additional inventoried items which were not
     included in the prior disclosure.

         In addition to the major business areas described above, the Company's
External Service Providers (third-party relationships material to the Company's
operations, including (i) service providers for the Company's Business Systems,
Plant Facilities and Office Facilities/Aviation described above, (ii) "supply"
relationships such as major suppliers of refinery feedstocks, (iii) "marketing"
relationships such as major customers and pricing services, and (iv)
"logistics" relationships such as pipelines, terminals, ships, barges and
storage facilities) could equally be affected by the Year 2000 problem, which
in turn could have an impact on the Company's business. For that reason, Year
2000 compliance of the External Service Providers



                                      21
<PAGE>   22

which the Company believes to be critical is also being assessed as part of the
Company's Year 2000 compliance plan. Over 70 Year 2000 questionnaires have been
sent to External Service Providers deemed to be critical. Additionally,
approximately 700 questionnaires have been sent to External Service Providers
classified as either high or low priority. As of August 5, 1999, responses have
been received for approximately 66% of the total questionnaires sent (78% of
critical service providers). The percentage of questionnaires received for
critical service providers declined from 83% as reported in the Company's first
quarter 1999 Form 10-Q due to a re-prioritization of External Service Providers
during the 1999 second quarter. A risk assessment of the responses is expected
to be completed by August 31, 1999 for all critical and high priority External
Service Providers, and contingency plans are expected to be developed for all
critical External Service Providers by September 30, 1999. Contingency plans
may also be developed for certain External Service Providers not deemed to be
critical depending upon their priority and level of risk.

COSTS

         Total external costs incurred to date in connection with the
completion of the Company's Year 2000 compliance plan are approximately $1
million. The estimated total external costs to complete the Company's Year 2000
compliance plan are currently estimated to be approximately $4 million. The
Company does not separately track internal costs, principally consisting of
payroll and related costs for its information systems group and certain other
employees, incurred in connection with its Year 2000 compliance efforts. The
above amounts do not include costs associated with the implementation of the
new client/server based systems described under "State of Readiness."

RISKS

         The scheduled completion dates and costs of compliance noted above are
the current best estimates of the Company's management and are believed to be
reasonably accurate. In the event unanticipated problems are encountered which
cause the compliance plan to fall behind schedule, the Company may need to
devote more resources to completing the plan and additional costs may be
incurred. If the Company were not able to satisfactorily complete its Year 2000
compliance plan, including identifying and resolving problems encountered by
the Company's External Service Providers, potential consequences could include,
among other things, unit downtime at or damage to the Company's refineries,
delays in transporting refinery feedstocks and refined products, impairment of
relationships with significant suppliers or customers, loss of accounting data
or delays in processing such data, and loss of or delays in internal and
external communications. The occurrence of any or all of the above could result
in a material adverse effect on the Company's results of operations, liquidity
or financial condition. Although the Company currently believes that it will
satisfactorily complete its Year 2000 compliance plan as described above prior
to January 1, 2000, there can be no assurance that the plan will be completed
by such time or that the Year 2000 problem will not adversely affect the
Company and its business.

CONTINGENCY PLANS

         During the second quarter of 1999, the Company made substantial
progress in developing Year 2000 contingency plans for its Business Systems,
Plant Facilities and Office Facilities/Aviation business areas, as well as for
various key corporate departments and certain critical External Service
Providers. These plans consist of documenting established plans of action to be
followed in the event certain assumed Year 2000 disruption scenarios occur
during the period January 1-15, 2000 and are designed to accomplish the
following objectives: (i) continue critical Company business operations; (ii)
minimize the decisions and effort required to continue business operations;
(iii) minimize dependence on any one person to continue business operations;



                                      22
<PAGE>   23

(iv) minimize the risks to the Company in terms of diminished cash flow,
income, assets or customer relations; and (v) establish lines of communication
to be followed while the plans are in action. As discussed above, the Company
currently anticipates that contingency planning will be substantially complete
by September 30, 1999.

YEAR 2000 INFORMATION AND READINESS DISCLOSURE ACT

         To the maximum extent permitted by applicable law, the above
information is being designated as a "Year 2000 Readiness Disclosure" pursuant
to the "Year 2000 Information and Readiness Disclosure Act" which was signed
into law on October 19, 1998.

FORWARD-LOOKING STATEMENTS

         The foregoing discussion contains certain estimates, predictions,
projections and other "forward-looking statements" (within the meaning of
Section 27A of the Securities Act of 1933 and Section 21E of the Securities
Exchange Act of 1934) that involve various risks and uncertainties. While these
forward-looking statements, and any assumptions upon which they are based, are
made in good faith and reflect the Company's current judgment regarding the
direction of its business, actual results will almost always vary, sometimes
materially, from any estimates, predictions, projections, assumptions, or other
future performance suggested herein. Some important factors (but not
necessarily all factors) that could affect the Company's sales volumes, growth
strategies, future profitability and operating results, or that otherwise could
cause actual results to differ materially from those expressed in any
forward-looking statement include the following: renewal or satisfactory
replacement of the Company's feedstock arrangements as well as market,
political or other forces generally affecting the pricing and availability of
refinery feedstocks and refined products; accidents or other unscheduled
shutdowns affecting the Company's, its suppliers' or its customers' pipelines,
plants, machinery or equipment; excess industry capacity; competition from
products and services offered by other energy enterprises; changes in the cost
or availability of third-party vessels, pipelines and other means of
transporting feedstocks and products; cancellation of or failure to implement
planned capital projects and realize the various assumptions and benefits
projected for such projects; the failure to avoid or correct a material Year
2000 problem, including internal problems or problems encountered by third
parties; state and federal environmental, economic, safety and other policies
and regulations, any changes therein, and any legal or regulatory delays or
other factors beyond the Company's control; weather conditions affecting the
Company's operations or the areas in which the Company's products are marketed;
rulings, judgments, or settlements in litigation or other legal matters,
including unexpected environmental remediation costs in excess of any reserves;
the introduction or enactment of federal or state legislation which may
adversely affect the Company's business or operations; and changes in the
credit ratings assigned to the Company's debt securities and trade credit. All
subsequent written and oral forward-looking statements attributable to the
Company or persons acting on its behalf are expressly qualified in their
entirety by the foregoing. The Company undertakes no obligation to publicly
release the result of any revisions to any such forward-looking statements that
may be made to reflect events or circumstances after the date hereof or to
reflect the occurrence of unanticipated events.



                                      23
<PAGE>   24


ITEM 3.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

COMMODITY PRICE RISK

         The Company is exposed to market risks related to the volatility of
crude oil and refined product prices, as well as volatility in the price of
natural gas used in the Company's refining operations. In order to reduce the
risks of these price fluctuations, the Company uses derivative commodity
instruments to hedge certain refinery feedstock and refined product inventories
to reduce the impact of adverse price changes on these inventories before the
conversion of the feedstock to finished products and ultimate sale. The Company
also uses derivative commodity instruments to hedge the price risk of
anticipated transactions. Such transactions include anticipated feedstock,
product and natural gas purchases, and product sales. These instruments are
used to lock in purchase or sales prices or components of refining operating
margins, including feedstock discounts, crack spreads (i.e., the difference
between the price of crude oil and conventional gasoline or heating oil) and
premium product differentials. In addition, the Company uses derivative
commodity instruments for trading purposes using its fundamental and technical
analysis of market conditions to earn additional revenues. The types of
instruments used in the Company's hedging and trading activities described
above include price swaps, options, and futures contracts. The Company's
positions in derivative commodity instruments are monitored and managed on a
daily basis by a risk control group to ensure compliance with the Company's
stated risk management policy which has been approved by the Company's Board of
Directors.

         The following table provides information about the Company's
derivative commodity instruments, which mature in 1999, held to hedge refining
inventories as of June 30, 1999 (dollars in thousands, except per barrel
amounts). Volumes shown for swaps represent notional volumes which are used to
calculate amounts due under the agreements.

<TABLE>
<CAPTION>
                                                                                      Fixed Price
                                                                            ------------------------------
                                                                              Payor             Receiver
                                                                            ---------          -----------
<S>                                                                         <C>                <C>
         Swaps:
             Notional volumes (Mbbls).............................              --                   600
             Weighted average pay price (per bbl).................              --             $     .26
             Weighted average receive price (per bbl).............              --             $     .37
             Fair value...........................................              --             $      68

         Futures:
             Volumes (Mbbls)......................................              2,679              8,645
             Weighted average price (per bbl).....................           $  18.62          $   19.95
             Contract amount......................................           $ 49,879          $ 172,428
             Fair value...........................................           $ 52,948          $ 182,242
</TABLE>



                                      24
<PAGE>   25

         The following table provides information about the Company's
derivative commodity instruments held to hedge anticipated feedstock and
product purchases, product sales and refining margins as of June 30, 1999 and
which mature in 1999 or 2000 (dollars in thousands, except amounts per barrel).

<TABLE>
<CAPTION>
                                                         Mature in 1999                Mature in 2000
                                                     ----------------------        ----------------------
                                                          Fixed Price                   Fixed Price
                                                     ----------------------        ----------------------
                                                      Payor        Receiver         Payor        Receiver
                                                     -------      ---------        -------      ---------

<S>                                                  <C>          <C>              <C>         <C>
Futures:
    Volumes (Mbbls) .........................             14              5            250            402
    Weighted average price (per bbl) ........        $ 19.89        $ 19.24        $ 18.39        $ 18.20
    Contract amount .........................        $   279        $    96        $ 4,598        $ 7,316
    Fair value ..............................        $   299        $   103        $ 5,035        $ 8,160
</TABLE>

         In addition to the above, as of June 30, 1999, the Company was the
fixed price payor under certain swap contracts held to hedge anticipated
purchases of refinery feedstocks and refined products that mature in 2002 with
notional volumes totaling approximately 7.5 million barrels, a weighted average
pay price of $20.11 per barrel, a weighted average receive price of $17.72 per
barrel, and a net unrecognized fair value of approximately $5 million.

         The following table provides information about the Company's
derivative commodity instruments held or issued for trading purposes as of June
30, 1999 and which mature in 1999 or 2000 (dollars in thousands, except amounts
per barrel or per million British thermal units ("MMBtu")). Volumes shown for
swaps represent notional volumes which are used to calculate amounts due under
the agreements.

<TABLE>
<CAPTION>
                                                               Mature in 1999                    Mature in 2000
                                                          --------------------------        ---------------------------
                                                                 Fixed Price                       Fixed Price
                                                          --------------------------        ---------------------------
                                                            Payor           Receiver          Payor            Receiver
                                                          ---------         --------        ---------         ---------

<S>                                                       <C>               <C>             <C>               <C>
Swaps:
    Notional volumes (Mbbls) .....................           17,250           15,775           13,650           14,025
    Weighted average pay price (per bbl) .........        $    1.97         $   1.64        $    1.89         $   1.82
    Weighted average receive price (per bbl) .....        $    1.89         $   1.96        $    1.78         $   2.17
    Fair value ...................................        $  (1,393)        $  5,034        $  (1,481)        $  5,005

    Notional volumes (MMBtus) ....................              620              620             --               --
    Weighted average pay price (per MMBtu) .......        $    2.13         $   1.31             --               --
    Weighted average receive price (per MMBtu) ...        $    1.31         $   2.32             --               --
    Fair value ...................................        $    (504)        $    622             --               --

Options:
    Volumes (Mbbls) ..............................            1,500            2,400             --               --
    Weighted average strike price (per bbl) ......        $   17.59         $  11.59             --               --
    Contract amount ..............................        $     544         $    515             --               --
    Fair value ...................................        $   1,674         $  1,674             --               --

Futures:
    Volumes (Mbbls) ..............................           21,369           21,314            6,387            6,447
    Weighted average price (per bbl) .............        $   17.19         $  17.12        $   15.22         $  14.91
    Contract amount ..............................        $ 367,241         $364,919        $  97,237         $ 96,131
    Fair value ...................................        $ 415,242         $409,009        $ 115,800         $116,921
</TABLE>



                                      25
<PAGE>   26


INTEREST RATE RISK

         The Company's primary market risk exposure for changes in interest
rates relates to the Company's long-term debt obligations. The Company manages
its exposure to changing interest rates principally through the use of a
combination of fixed and floating rate debt and currently does not use
derivative financial instruments to manage such risk. See Management's
Discussion and Analysis of Financial Condition and Results of Operations
Liquidity and Capital Resources for a discussion of various initiatives
undertaken by the Company in the first six months of 1999 to reduce its
exposure to increases in interest rates and increase its financial flexibility.




                                      26
<PAGE>   27



PART II - OTHER INFORMATION

ITEM 1.  LEGAL PROCEEDINGS.

         On November 25, 1998, the Texas Natural Resources Conservation
Commission ("TNRCC") initiated an enforcement action against the Company's
Corpus Christi refinery alleging violations of state and federal air
regulations and proposed an Agreed Order settlement of $226,050. The TNRCC
alleged that nitrous oxide emission monitors were not installed in two utility
boiler stacks and certain record keeping and monitoring deficiencies. The
Company challenged the allegations and on June 16, 1999 a final settlement was
reached with the TNRCC for $111,000 in penalties. All deficiencies noted by the
TNRCC have been corrected.

         On June 11, 1999, the TNRCC notified the Company of its commencement
of proceedings against the Company's Texas City refinery concerning certain
record keeping deficiencies and alleged emissions exceedances which occurred
prior to the Company's acquisition of the refinery. Corrective action was
immediately taken and all contested matters have been resolved. Settlement
negotiations are ongoing with the TNRCC and the Company expects that the
penalties imposed will be less than $150,000.

ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.

         The Company's annual meeting of stockholders was held April 29, 1999.
Matters voted on at the meeting and the results thereof were (i) a proposal to
elect three Class II directors to serve until 2002: Ronald K. Calgaard
(approved with 50,578,078 affirmative votes, and 146,872 abstentions), William
E. Greehey (approved with 50,567,965 affirmative votes, and 156,985
abstentions), and Susan Kaufman Purcell (approved with 50,577,287 affirmative
votes, and 147,663 abstentions); and (ii) a proposal to ratify the appointment
of Arthur Andersen LLP as independent public accountants (approved with
50,687,560 affirmative votes, 20,259 negative votes, and 17,131 abstentions).
Directors whose term of office continued after the meeting were: Edward C.
Benninger, Robert G.
Dettmer, Ruben M. Escobedo, James L. Johnson and Lowell H. Lebermann.

ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K.

         (a)  Exhibits.

         *+10.18  Employment Agreement dated March 25, 1999, effective as of
                  April 29, 1999 between Valero Energy Corporation and
                  William E. Greehey.

        **27.1    Financial Data Schedule (reporting financial information as
                  of and for the six months ended June 30, 1999).

- --------------------------
 *   Filed herewith
+    Identifies a management contract or compensatory plan or arrangement
     required to be filed as an exhibit hereto pursuant to Item 6(a) of Form
     10-Q.
**   The Financial Data Schedule shall not be deemed "filed" for purposes of
     Section 11 of the Securities Act of 1933 or Section 18 of the Securities
     Exchange Act of 1934, and is included as an exhibit only to the electronic
     filing of this Form 10-Q in accordance with Item 601(c) of Regulation S-K
     and Section 401 of Regulation S-T.

         (b) Reports on Form 8-K. The Company did not file any Current Reports
on Form 8-K during the quarter ended June 30, 1999.




                                      27
<PAGE>   28


                                   SIGNATURE

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.



                                         VALERO ENERGY CORPORATION
                                                 (Registrant)


                                         By:  /s/ John D. Gibbons
                                             -----------------------------------
                                                  John D. Gibbons
                                                  Chief Financial Officer, Vice
                                                    President - Finance
                                                  (Duly Authorized Officer and
                                                  Principal Financial and
                                                  Accounting Officer)


Date: August 13, 1999



                                      28
<PAGE>   29
                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
    EXHIBIT
    NUMBER     DESCRIPTION
    -------    -----------

<S>            <C>
   *+10.18     Employment Agreement dated March 25, 1999, effective as of April
               29, 1999 between Valero Energy Corporation and William E.
               Greehey.

   **27.1      Financial Data Schedule (reporting financial information as of
               and for the six months ended June 30, 1999).
</TABLE>

- --------------------------
 *   Filed herewith
+    Identifies a management contract or compensatory plan or arrangement
     required to be filed as an exhibit hereto pursuant to Item 6(a) of Form
     10-Q.
**   The Financial Data Schedule shall not be deemed "filed" for purposes of
     Section 11 of the Securities Act of 1933 or Section 18 of the Securities
     Exchange Act of 1934, and is included as an exhibit only to the electronic
     filing of this Form 10-Q in accordance with Item 601(c) of Regulation S-K
     and Section 401 of Regulation S-T.



<PAGE>   1
                                                                  EXHIBIT 10.18

                             EMPLOYMENT AGREEMENT

         This Employment Agreement ("Agreement"), between Valero Energy
Corporation, a Delaware corporation ("Valero"), and William E. Greehey, a
resident of San Antonio, Texas, ("Mr. Greehey") is executed effective as of the
25th day of March 1999 ("Effective Date"). Valero and Mr. Greehey are sometimes
referred to herein individually as a "Party," and collectively as the
"Parties." The Parties hereby agree as follows:

         1. Employment. Valero hereby employs Mr. Greehey, and Mr. Greehey
hereby accepts employment with Valero, subject to the terms and conditions set
forth in this Agreement.

         2. Term. Subject to the provisions for termination of employment as
provided in Section 9(a), this Agreement shall be in effect beginning on the
Effective Date and ending on July 31, 2001 ("Initial Period"). If Mr. Greehey
notifies Valero at least ninety (90) calendar days prior to the end of the
Initial Period of his intention to extend this Agreement, then this Agreement
shall be extended on a month-to-month basis ("Extension Period"). Mr. Greehey
may terminate this Agreement within the Extension Period by giving Valero
ninety (90) calendar days written notice of termination.

         3. Compensation. Mr. Greehey's compensation during his employment
under the terms of this Agreement and prior to his retirement shall be as
follows:

                  (a) Base Salary. Valero shall pay to Mr. Greehey a base
         salary (the "Base Salary") of Nine Hundred Thousand Dollars ($900,000)
         per year. In addition, the Board of Directors of Valero shall in good
         faith consider granting annual increases to the Base Salary based upon
         such factors as Mr. Greehey's performance and the growth and
         profitability of Valero, but it shall have no obligation to grant any
         such increases in compensation; provided that, based upon the same
         such factors, the Board of Directors of Valero may thereafter reduce
         the Base Salary to an amount that is not below the amount first set
         forth above in this Paragraph 3(a). The Base Salary, as from time to
         time so increased or subsequently decreased, shall be payable in
         equal, semi-monthly installments on the 15th day and last day of each
         month or at such other times and in such installments as may be agreed
         between Valero and Mr. Greehey. All payments shall be subject to the
         deduction of payroll taxes, income tax withholdings, and similar
         deductions and withholdings as required by law.

                  (b) Bonus. In addition to the Base Salary, Mr. Greehey shall
         be eligible to receive bonus compensation in such amounts and at such
         times as the Board of Directors of Valero shall from time to time
         determine. In the year of his retirement, Mr. Greehey shall be
         eligible to receive a pro-rata share of bonus compensation in such
         amount as the Board of Directors of Valero shall determine at the
         customary time annual bonuses are determined and paid to executive
         officers of Valero.

                  (c) Stock Option Grant. On the Effective Date, Mr. Greehey
         shall receive a nonqualified stock option grant (each an "Option") to
         purchase 860,000 shares of $.01 par



<PAGE>   2

         value common stock of Valero ("Common Stock"), with an exercise price
         per share equal to the fair market value of the Common Stock on the
         Effective Date. Fifty percent (50%) of the options shall vest on the
         first anniversary of the Effective Date and the remaining 50% shall
         vest on the second anniversary of the Effective Date, and the options
         shall have a total term of ten years from the Effective Date. These
         vesting periods shall not be modified by the accelerated vesting
         provisions set forth in Paragraph 7(f).

                  (d) Performance Share Award. On the Effective Date, Mr.
         Greehey shall receive an award of 150,000 Performance Shares under
         Valero's Executive Stock Incentive Plan. Fifty percent (50%) of the
         Performance Shares shall vest on the first anniversary of the
         Effective Date and the remaining 50% shall vest on the second
         anniversary of the Effective Date. The Performance Shares shall be
         available to be earned on each vesting date pursuant to established
         performance criteria set forth in the award agreement to be entered
         into between Mr. Greehey and Valero.

         4. Expenses and Benefits. During his employment, Mr. Greehey is
authorized to incur reasonable expenses in connection with the business of
Valero, including expenses for entertainment, travel and similar matters.
Valero will reimburse Mr. Greehey for such expenses upon presentation by Mr.
Greehey of such accounts and records as Valero may from time to time reasonably
require. Valero also agrees to provide Mr. Greehey with the following benefits
during employment:

                  (a) Insurance. Permanent life insurance in accordance with
         Paragraph 7(g) in addition to any life insurance under Valero's normal
         benefit plans.

                  (b) Employee Benefit Plans. Participation in any employee
         benefit plans now existing or hereafter adopted by Valero for its
         executives or other officers and employees.

                  (c) Club Memberships. Valero shall reimburse Mr. Greehey for
         all monthly dues and fees for Mr. Greehey's present country club
         memberships and for any expenses incurred by Mr. Greehey in connection
         with such club memberships in representing Valero's interests.

                  (d) Vacations. Mr. Greehey shall be entitled (in addition to
         the usual Valero holidays) to a paid vacation for a period in each
         calendar year not exceeding five weeks.

                  (e) Working Facilities. Mr. Greehey shall be furnished by
         Valero with an office, secretarial help and other facilities and
         services, including but not limited to, full use of Valero's mail and
         communication facilities and services reasonably suitable to his
         position and reasonably necessary for the performance of his duties
         under this Agreement.

                  (f) Tax Planning. Mr. Greehey will be furnished tax planning
         services by an independent certified public accounting firm of the
         type furnished to executive officers of Valero.

                  (g) Other. Such other items as Valero shall from time to time
         consider necessary or appropriate to assist Mr. Greehey in or to
         provide incentives or compensation for the performance of his duties
         under this Agreement.



<PAGE>   3

         5. Positions and Duties. Mr. Greehey is employed as Chief Executive
Officer of Valero and for no additional compensation shall, subject to his
being elected or re-elected as a director by Valero's stockholders, serve at
the discretion of the Board as its Chairman of the Board. In addition, if
requested to do so, Mr. Greehey shall serve as the chief executive officer or
as a member of the Board of Directors, or both, of any subsidiary or affiliate
of Valero. Such duties shall be performed at Valero's principal place of
business in San Antonio, Texas.

         6. Extent of Service. Mr. Greehey shall, during his employment under
the terms of this Agreement, devote substantially all of his working time,
attention, energies and business efforts to his duties as an employee of Valero
and to the business of Valero generally, and shall not, during the term of this
Agreement, engage in any other business activity whatsoever, whether or not
such business activity is pursued for gain, profit or other pecuniary
advantage; however, this Paragraph 6 shall not be construed to prevent Mr.
Greehey from serving as a member of the board of directors of other companies,
or from investing his personal, private assets as a passive investor in such
form or manner as will not require any active services on the part of Mr.
Greehey in the management or operation of the affairs of the companies,
partnerships, or other business entities in which any such passive investments
are made.

         7. Retirement. Notwithstanding the term and notice provisions of
Paragraph 2, Mr. Greehey may retire at any time as Chief Executive Officer of
Valero under the terms of this Agreement by giving Valero written notice of his
intention to retire ninety (90) days in advance of the designated retirement
date. Upon retirement, and provided that Valero has not terminated Mr. Greehey
for cause pursuant to Paragraph 9(a), Mr. Greehey shall no longer be employed
by Valero, but he shall have the following rights and obligations:

                  (a) Continuation as Chairman. Subject to his being elected or
         re-elected as a director by Valero's stockholders, Mr. Greehey agrees
         to continue serving at the discretion of the Board as Chairman of the
         Board of Valero for two years following his effective date of
         retirement;

                  (b) Duties. As Chairman of the Board of Valero, Mr. Greehey
         shall perform such duties as are reasonably required by a person
         holding such position. However, it is agreed and understood that Mr.
         Greehey shall not be obligated to devote any particular amount of time
         to the affairs of Valero over and above that which he determines is
         necessary to perform his duties as a director, and will be free to
         pursue other business interests provided the pursuit thereof does not
         violate any fiduciary duty owed to Valero in Mr. Greehey's capacity as
         Chairman of the Board or violate the provisions of Paragraphs 11 or
         12;

                  (c) Compensation. Mr. Greehey shall be paid for serving as
         Chairman of the Board for such two-year period an amount per annum
         equal to one-half of the Base Salary being paid to Mr. Greehey at the
         time of his retirement, which shall be payable in semi-monthly
         installments;

                  (d) Working Facilities. Valero shall provide Mr. Greehey with
         off-site office facilities and secretarial and other office services
         reasonably commensurate with


<PAGE>   4

         Mr. Greehey's position as retired Chief Executive Officer of Valero.
         The office facilities and secretarial and other services to be provided
         to Mr. Greehey following his retirement shall continue until December
         31, 2005.

                  (e) Annual Physical Examination. Valero shall pay for an
         annual physical examination for Mr. Greehey for the remainder of his
         life.

                  (f) Vesting and Option Exercise Periods. Upon retirement, Mr.
         Greehey's stock options, stock appreciation rights, restricted stock
         grants, performance share awards, and any other similar stock or
         long-term incentive rights or benefits previously granted to Mr.
         Greehey, which have not fully vested, shall immediately fully vest,
         except for any unvested stock options granted to Mr. Greehey pursuant
         to Paragraph 3(c). Mr. Greehey shall have the right to exercise any
         vested stock options or other similar stock or long-term incentive
         rights or benefits that have an option or exercise feature for the
         full remaining term thereof. Any outstanding performance share awards
         shall be deemed to have been earned at the target level for the full
         term and shares of Valero Common Stock representing such awards deemed
         earned at the target level shall promptly be issued to Mr. Greehey.

                  (g) Retirement Benefits and Supplemental Retirement Benefits.
         Mr. Greehey shall be entitled to all retirement benefits provided
         under the Valero Energy Corporation Pension Plan ("Pension Plan") and
         Supplemental Executive Retirement Plan ("SERP"), with the following
         supplemental benefits:

                           (i) retiree medical coverage consistent with
                  coverage amounts and/or deductibles and costs as provided to
                  other Valero retirees;

                           (ii) paid up permanent life insurance, in addition
                  to life insurance included in Valero's normal retirement
                  benefit plans, with cash value of at least $300,000;

                           (iii) a total of eight "points" under the SERP to be
                  added to his years of credited service, or his age, or
                  divided between both in such proportion that total eight, as
                  he elects at the time of his retirement (the amount per month
                  equal to the difference between Mr. Greehey's normal monthly
                  retirement benefit under the Pension Plan and the SERP with
                  the eight added points shall constitute a supplemental
                  monthly retirement payment, payable at the time each payment
                  is made under the Pension Plan; and for purposes of
                  calculating Mr. Greehey's monthly retirement benefits,
                  service shall be deemed continuous from August 19, 1963
                  through the date of retirement pursuant to this Agreement);
                  and

                           (iv) payments under any other employee benefit
                  plan(s), which are due as a result of separation of service.

                  Mr. Greehey shall not be entitled to participate in nor
         receive the benefits of any special "window" retirement or early
         retirement program, if any, that may from time to time be offered to
         other employees of Valero.

<PAGE>   5

         8. Death and Disability.

                  (a) Death.

                           (i) If during the term of Mr. Greehey's employment
                  under this Agreement and prior to the date of retirement Mr.
                  Greehey dies, then in addition to all other employee benefits
                  to which Mr. Greehey's estate, spouse or other beneficiaries
                  may be entitled, Valero shall pay in equal semi-monthly
                  installments to the beneficiary designated by Mr. Greehey, or
                  his estate if no such beneficiary has been designated in
                  writing to Valero, the Base Salary that Mr. Greehey would
                  have received if he had remained employed to the end of the
                  Initial Period or, if his employment has been extended
                  pursuant to Paragraph 2, to the end of the Extension Period.

                           (ii) If during the term of Mr. Greehey's service as
                  Chairman of the Board pursuant to Paragraph 7(a) Mr. Greehey
                  dies, then in addition to all other benefits to which Mr.
                  Greehey's estate, spouse or other beneficiaries may be
                  entitled, Valero shall pay in equal semi-monthly installments
                  to the beneficiary designated by Mr. Greehey, or his estate
                  if no such beneficiary has been designated in writing to
                  Valero, the compensation provided for in Paragraph 7(c) that
                  Mr. Greehey would have received if he had continued to serve
                  as Chairman of the Board for the remainder of the two-year
                  period following the end effective date of his retirement.

                  (b) Disability.

                           (i) If during the term of Mr. Greehey's employment
                  under this Agreement he becomes unable to perform his duties
                  as Chief Executive Officer as a result of illness or physical
                  injury as defined in Valero's Long Term Disability Plan, Mr.
                  Greehey shall be deemed to have retired and be entitled to
                  the benefits described in Paragraph 7(d), (e), (f) and (g).

                           (ii) If following his retirement as Chief Executive
                  Officer, Mr. Greehey is not elected or re-elected as a
                  director by Valero's stockholders or becomes unable to
                  perform his duties as Chairman of the Board, as determined by
                  a majority of the other Directors, Mr. Greehey's obligations
                  under Paragraph 7(a) and (b) shall cease; however, Mr.
                  Greehey shall be entitled to the balance of the remaining two
                  years' compensation for serving as Chairman of the Board, as
                  defined in Paragraph 7 (c), payable in semi-monthly
                  installments.

         9. Termination by Valero. Valero shall have the right to terminate Mr.
Greehey's employment as hereinafter provided.

                  (a) Termination for Cause. Valero shall have the right to
         terminate Mr. Greehey's employment under this Agreement for cause. As
         used herein, "cause" shall mean and be strictly limited to:

                           (i) Mr. Greehey's conviction of a crime constituting
                  a felony under federal or state law or involving moral
                  turpitude;


<PAGE>   6

                           (ii) an illegal act or acts that were intended to and
                  did defraud Valero; or

                           (iii) the willful refusal by Mr. Greehey to fulfill
                  responsibilities under this Agreement after written notice of
                  such willful refusal from the Board and the failure to
                  correct such refusal within 30 days from the date such notice
                  is given.

                  If Valero terminates this Agreement pursuant to the
         provisions of this Paragraph 9(a): (i) all compensation or other
         benefits due Mr. Greehey pursuant to Paragraphs 3 and 4, or 7(c), as
         the case may be, shall be paid by Valero to Mr. Greehey to the date of
         such termination; and (ii) all supplemental and additional benefits
         and rights granted to Mr. Greehey at retirement by Paragraph 7 shall
         be automatically revoked and become null and void; and, upon such
         payment by Valero of the amounts required under subparagraph (i), all
         obligations of Valero to Mr. Greehey shall be totally and completely
         satisfied, and Valero shall have no further obligations of any type to
         Mr. Greehey pursuant to this Agreement.

                  (b) Termination other than for Cause. Valero shall have the
         right to terminate Mr. Greehey's employment as Chief Executive Officer
         under this Agreement without cause, and Mr. Greehey's employment under
         this Agreement shall be deemed terminated upon the giving of ninety
         (90) days written notice to such effect by Valero to Mr. Greehey. A
         termination of employment other than as a result of death, retirement,
         disability, or in accordance with Paragraph 9(a) shall be deemed a
         termination without cause. In the event of termination without cause:

                           (i) Valero shall pay Mr. Greehey in cash a lump sum
                  amount equal to the product of Mr. Greehey's semi-monthly
                  Base Salary being paid to Mr. Greehey at the date of such
                  termination multiplied by the number of semi-monthly pay
                  periods remaining to the end of the Initial Period (or
                  successive monthly period if employment has been extended
                  pursuant to Paragraph 2), plus an amount equal to the highest
                  annual bonus paid to Mr. Greehey during the five years
                  preceding the time of such termination. Such amount shall be
                  paid within five business days of termination;

                           (ii) Mr. Greehey shall receive all the payments and
                  benefits to which he is entitled pursuant to Paragraph 7(f)
                  and (g); but shall not be entitled to receive any further
                  payments or benefits under Paragraph 7 after the date of such
                  termination, including any payment under 7(c).

                  (c) Termination as Chairman of the Board. If for any reason
         Mr. Greehey is removed by a majority of the other Directors as
         Chairman of the Board after his retirement as Chief Executive Officer,
         other than as a result of death or disability or for cause, he shall
         receive the balance of the remaining two years' compensation for
         serving as Chairman of the Board as defined in Paragraph 7(c), payable
         in semi-monthly installments.

         10. Executive Severance Agreement. In the event Mr. Greehey receives
any cash


<PAGE>   7

payments under that certain Executive Severance Agreement dated December 15,
1982 between Valero and Mr. Greehey, Valero shall be entitled to credit any cash
payments that are made to Mr. Greehey pursuant to his Executive Severance
Agreement against any cash payments that it is obligated to make under this
Agreement. Valero agrees that if remuneration or benefits of any form paid to
Mr. Greehey by Valero during or after his employment with Valero are excess
parachute payments as defined in Section 280G of the Internal Revenue Code of
1986, as amended ("Code"), and are subject to the 20% excise tax imposed by
Section 4999 of the Code, Valero shall pay Mr. Greehey a bonus no later than
seven days prior to the earliest of the due date for the excise tax return or
initial estimated payment, in an amount equal to the excise tax payable as a
result of the excess parachute payment and any additional federal income taxes
(including any additional excise taxes) payable by him as a result of the bonus,
assuming that he will be subject to federal income taxes at the highest
individual marginal rate. It is the intention of the Parties that the bonus be
"grossed up" so that the bonus contains sufficient funds to pay the excise and
all additional federal income taxes due as a result of the bonus payment so that
Mr. Greehey will suffer no detriment from the excise tax payable as a result of
the excess golden parachute payments.

         11. Disclosure of Confidential Information. Except to the extent
absolutely required in the performance of his duties and obligations to Valero
as expressly authorized herein, or by prior written consent of a duly
authorized officer or director of Valero, Mr. Greehey will not, directly or
indirectly, at any time during his employment with Valero, or at any time
subsequent to the termination thereof, for any reason whatsoever, with or
without cause, breach the confidence reposed in him by Valero by using,
disseminating, disclosing, divulging or in any manner whatsoever disclosing or
permitting to be divulged or disclosed in any manner to any person, firm,
corporation, association or other business entity, trade secrets, secret
methods or "Confidential Information" of Valero, nor will Mr. Greehey lecture
on or publish articles concerning any trade secrets, secret methods or
"Confidential Information" of Valero. As used herein, the term "Confidential
Information" means any and all information concerning Valero's products,
processes, sources of supply, and services, including information relating to
research, development, inventions, manufacture, purchasing, accounting,
engineering, marketing, merchandising, or the selling of any product or
products to any customers of Valero, disclosed to Mr. Greehey or known by Mr.
Greehey as a consequence of or through his employment by Valero (or any parent,
subsidiary or affiliated corporations of Valero) including, but not necessarily
limited to, any person, firm, corporation, association or other business entity
with which Valero has any type of agency agreement, or any shareholders,
directors, or officers of any such person, firm, corporation, association or
other business entity, if such information is not generally known in any
industry in which Valero is or may become engaged during the term of this
Agreement. On termination of employment with Valero, all documents, records,
notebooks, or similar repositories of or containing Confidential Information,
including all copies of any documents, records, notebooks, or similar
repositories of or containing Confidential Information, then in Mr. Greehey's
possession or in the possession of any third party under the control of Mr.
Greehey or pursuant to any agreement with Mr. Greehey, whether prepared by Mr.
Greehey or any other person, firm, corporation, association or other business
entity, will be delivered to Valero by Mr. Greehey.

         12. Noncompetition. Mr. Greehey recognizes and understands that in
performing the responsibilities of his employment, he will occupy a position of
fiduciary trust and confidence, pursuant to which he will develop and acquire
experience and knowledge with respect to Valero's


<PAGE>   8

business. It is the expressed intent and agreement of Mr. Greehey and Valero
that such knowledge and experience shall be used exclusively in the furtherance
of the interests of Valero and not in any manner which would be detrimental to
Valero's interests. Mr. Greehey further understands and agrees that Valero
conducts its business within a specialized market segment throughout the United
States, and that it would be detrimental to the interests of Valero if Mr.
Greehey used the knowledge and experience which he currently possesses or which
he acquires pursuant to his employment hereunder for the purpose of directly or
indirectly competing with Valero or for the purpose of aiding other persons or
entities in so competing with Valero. In consideration for the benefits herein,
Mr. Greehey therefore agrees that so long as he is employed by Valero and for a
period of the greater of (i) two years after termination of Mr. Greehey's
employment, or (ii) as long as he is receiving any payments under Paragraph
7(c), unless he first secures the written consent of Valero, Mr. Greehey will
not directly or indirectly invest, engage or participate in any entity in direct
or indirect competition with Valero's business or contract to do so, other than
investments in amounts aggregating less than 1% in any securities of any company
that is obligated under the 1934 Act to file periodic reports pursuant to
Section 13 thereunder. In the event that the provisions of this Paragraph 12
should ever be deemed to exceed the time or geographic limitations permitted by
applicable laws, then such provisions shall be reformed to the maximum time or
geographic limitations permitted by applicable law.

         13. Insurance. Valero may, in its sole and absolute discretion, at any
time after the Effective Date, apply for and procure, as owner and for its own
benefit, insurance on the life of Mr. Greehey, in such amounts and in such
forms as Valero may choose. Unless otherwise agreed by Valero, Mr. Greehey
shall have no interest whatsoever in any such policy or policies, but Mr.
Greehey shall, at Valero's request, submit to such medical examinations, supply
such information, and execute and deliver such documents as may be required by
the insurance company or companies to which Valero has applied for such
insurance.

         14. Acknowledgment of Mr. Greehey. Mr. Greehey hereby acknowledges that
his execution of this Agreement is given in consideration of the following, any
of which Mr. Greehey acknowledges is adequate consideration:

                  (i) Valero's employment of Mr. Greehey under the terms and
         conditions contained herein; and

                  (ii) The termination by Valero of any previous employment
         agreement between Valero and Mr. Greehey.

         15. Notice. Any notice, request, reply, instruction, or other
communication provided or permitted in this Agreement must be given in writing
and may be served by depositing same in the United States mail in certified or
registered form, postage prepaid, addressed to the Party to be notified with
return receipt requested, or by delivering the notice in person to such Party.
Unless actual receipt is required by any provision of this Agreement, notice
deposited in the United States mail in the manner herein prescribed shall be
effective on dispatch. For purposes of notice, the address of Mr. Greehey, his
spouse, any purported donee or transferee or any administrator, executor or
legal representative of Mr. Greehey or his estate, as the case may be, shall be
as follows:

<PAGE>   9

The address of Valero shall be:

                               Valero Energy Corporation
                               One Valero Place
                               P.O. Box 500
                               San Antonio, Texas 78212-3186 (78292-0500)
                               Attention: General Counsel

Valero and Mr. Greehey shall have the right from time to time and at any time
to change their respective addresses and shall have the right to specify as
their respective addresses any other address by giving at least ten days
written notice to the other Party as provided hereby.

         16. Termination of other Employment Agreements. On the Effective Date,
all other prior employment agreements between the Parties in effect on the
Effective Date shall terminate and forever be from the date null, void and of
no further force or effect whatsoever, and any and all such agreements shall be
superseded in their entirety by this Agreement.

         17. Litigation. In the event litigation shall be brought by either
Party to enforce or interpret any provision contained in this Agreement the
following provisions shall apply:

                  (a) if Mr. Greehey brings such an action, and it is not
         established by clear and convincing evidence that Mr. Greehey has no
         meritorious bases for such action, Valero shall pay all of Mr.
         Greehey's and Valero's legal fees incurred in connection with such
         litigation;

                  (b) in the event Valero brings such an action, and it is not
         established by clear and convincing evidence that Mr. Greehey has no
         meritorious defenses to such action, Valero shall pay all of Mr.
         Greehey's and Valero's legal fees incurred in connection with such
         litigation; and

                  (c) any claim by Valero of a right to terminate this
         Agreement pursuant to Paragraph 9(a) which is subjected to litigation
         must be established by Valero by clear and convincing evidence.

         18. Controlling Law. The execution, validity, interpretation, and
performance of this Agreement shall be determined and governed by the laws of
the State of Texas.

         19. Additional Instruments. Valero and Mr. Greehey shall execute and
deliver any and all additional instruments and agreements which may be
necessary or proper to carry out this Agreement.

         20. Entire Agreement. This Agreement contains the entire agreement of
the Parties. This Agreement may not be changed orally but only by an agreement
in writing signed by the Party against whom enforcement of any waiver, change,
modification, extension or discharge is sought.

         21. Separability. If any provision of the Agreement is rendered or
declared illegal or


<PAGE>   10

unenforceable by reason of any existing or subsequently enacted legislation or
by decree of a court of last resort, Valero and Mr. Greehey shall promptly meet
and negotiate substitute provisions for those rendered and declared illegal or
unenforceable, and all the remaining provisions of this Agreement shall remain
in full force and effect.

         22. Effect of Agreement. This Agreement shall be binding upon Mr.
Greehey and his heirs, executors, legal representatives, successors and
assigns, and Valero and its legal representatives, successors and assigns.

         23. Execution. This Agreement may be executed in multiple counterparts
each of which shall be deemed an original and all of which shall constitute one
instrument.

         24. Waiver of Breach. The waiver by Valero of a breach of any
provision of the Agreement by Mr. Greehey shall not operate or be construed as
a waiver by Valero of any subsequent breach by Mr. Greehey. The waiver by Mr.
Greehey of a breach of any provision of the Agreement by Valero shall not
operate or be construed as a waiver by Mr. Greehey of any subsequent breach by
Valero.


<PAGE>   11

         IN WITNESS WHEREOF, the Parties have executed this Agreement as of the
Effective Date.



                                           /s/ William E. Greehey
                                           -------------------------------------
                                           WILLIAM E. GREEHEY



                                           VALERO ENERGY CORPORATION


                                           By: /s/ Keith D. Booke
                                               ---------------------------------
                                                   Keith D. Booke,
                                                   Vice President-Administration
                                                   and Human Resources



<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEET AS OF JUNE 30, 1999 AND THE CONSOLIDATED STATEMENT OF
INCOME FOR THE SIX MONTHS ENDED JUNE 30, 1999 AND IS QUALIFIED IN ITS ENTIRETY
BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                           5,804
<SECURITIES>                                         0
<RECEIVABLES>                                  304,028
<ALLOWANCES>                                     1,600
<INVENTORY>                                    329,612
<CURRENT-ASSETS>                               738,149
<PP&E>                                       2,628,453
<DEPRECIATION>                                 655,578
<TOTAL-ASSETS>                               2,869,984
<CURRENT-LIABILITIES>                          513,161
<BONDS>                                        916,104
                                0
                                          0
<COMMON>                                           563
<OTHER-SE>                                   1,055,561
<TOTAL-LIABILITY-AND-EQUITY>                 2,869,984
<SALES>                                      3,161,553
<TOTAL-REVENUES>                             3,161,553
<CGS>                                        3,173,766
<TOTAL-COSTS>                                3,173,766
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              26,975
<INCOME-PRETAX>                               (38,201)
<INCOME-TAX>                                  (13,400)
<INCOME-CONTINUING>                           (24,801)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (24,801)
<EPS-BASIC>                                      (.44)
<EPS-DILUTED>                                    (.44)


</TABLE>


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