SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  Schedule 13D

                    Under the Securities Exchange Act of 1934


                                  Premcor Inc.
           -----------------------------------------------------------
                                (Name of Issuer)


                                  Common Stock
           -----------------------------------------------------------
                         (Title of Class of Securities)


                                   74045Q 10 4
           -----------------------------------------------------------
                                 (CUSIP Number)


                            Donald P. de Brier, Esq.
                        Occidental Petroleum Corporation
                            10889 Wilshire Boulevard
                          Los Angeles, California 90024
                                 (310) 208-8800
           -----------------------------------------------------------
            (Name, Address and Telephone Number of Person Authorized
                     to Receive Notices and Communications)


                                  June 6, 2002
           -----------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)


If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-l(e), 13d-1(f) or 13d-1(g), check the following box
[ ]


                               Page 1 of 20 Pages



                              CUSIP No. 74045Q 10 4
                                        -----------


(1)  Names of reporting persons.                            Occidental Petroleum
                                                            Corporation
     I.R.S. Identification Nos. of above persons            95-4035997
     (entities only).

(2)  Check the appropriate box if a member of a group       (a)

     (see instructions)                                     (b)

(3)  SEC use only.

(4)  Source of funds (see instructions).                    OO

(5)  Check if disclosure of legal proceedings is
     required pursuant to Items 2(d) or 2(e).

(6)  Citizenship or place of organization.                  Delaware

Number of shares beneficially owned by each reporting
person with:

     (7)  Sole voting power.                                1,633,636

     (8)  Shared voting power.                              6,101,010

     (9)  Sole dispositive power.                           1,633,636

     (10) Shared dispositive power.                         6,101,010

(11) Aggregate amount beneficially owned by each            7,734,646
     reporting person

(12) Check if the aggregate amount in Row (11)
     excludes certain shares (see instructions).

(13) Percent of class represented by amount in Row          13.5%
     (11).

(14) Type of reporting person (see instructions).           CO


                               Page 2 of 20 Pages



                              CUSIP No. 74045Q 10 4
                                        -----------


(1)  Names of reporting persons.                            Occidental C.O.B.
                                                            Partners
     I.R.S. Identification Nos. of above persons            73-1484588
     (entities only).

(2)  Check the appropriate box if a member of a group       (a)

     (see instructions)                                     (b)

(3)  SEC use only.

(4)  Source of funds (see instructions).                    OO

(5)  Check if disclosure of legal proceedings is
     required pursuant to Items 2(d) or 2(e).

(6)  Citizenship or place of organization.                  Delaware

Number of shares beneficially owned by each reporting
person with:

     (7)  Sole voting power.

     (8)  Shared voting power.                              6,101,010

     (9)  Sole dispositive power.

     (10) Shared dispositive power.                         6,101,010

(11) Aggregate amount beneficially owned by each            6,101,010
     reporting person

(12) Check if the aggregate amount in Row (11)
     excludes certain shares (see instructions).

(13) Percent of class represented by amount in Row          10.6%
     (11).

(14) Type of reporting person (see instructions).           PN


                               Page 3 of 20 Pages



                              CUSIP No. 74045Q 10 4
                                        -----------


(1)  Names of reporting persons.                            Placid Oil Company
     I.R.S. Identification Nos. of above persons            72-0395174
     (entities only).

(2)  Check the appropriate box if a member of a group       (a)

     (see instructions)                                     (b)

(3)  SEC use only.

(4)  Source of funds (see instructions).                    OO

(5)  Check if disclosure of legal proceedings is
     required pursuant to Items 2(d) or 2(e).

(6)  Citizenship or place of organization.                  Delaware

Number of shares beneficially owned by each reporting
person with:

     (7)  Sole voting power.

     (8)  Shared voting power.                              6,101,010

     (9)  Sole dispositive power.

     (10) Shared dispositive power.                         6,101,010

(11) Aggregate amount beneficially owned by each            6,101,010
     reporting person

(12) Check if the aggregate amount in Row (11)
     excludes certain shares (see instructions).

(13) Percent of class represented by amount in Row          10.6%
     (11).

(14) Type of reporting person (see instructions).           CO


                               Page 4 of 20 Pages



                              CUSIP No. 74045Q 10 4
                                        -----------


(1)  Names of reporting persons.                            OXY USA Inc.
     I.R.S. Identification Nos. of above persons            73-1166880
     (entities only).

(2)  Check the appropriate box if a member of a group       (a)

     (see instructions)                                     (b)

(3)  SEC use only.

(4)  Source of funds (see instructions).                    OO

(5)  Check if disclosure of legal proceedings is
     required pursuant to Items 2(d) or 2(e).

(6)  Citizenship or place of organization.                  Delaware

Number of shares beneficially owned by each reporting
person with:

     (7)  Sole voting power.

     (8)  Shared voting power.                              6,101,010

     (9)  Sole dispositive power.

     (10) Shared dispositive power.                         6,101,010

(11) Aggregate amount beneficially owned by each            6,101,010
     reporting person

(12) Check if the aggregate amount in Row (11)
     excludes certain shares (see instructions).

(13) Percent of class represented by amount in Row          10.6%
     (11).

(14) Type of reporting person (see instructions).           CO


                               Page 5 of 20 Pages



                              CUSIP No. 74045Q 10 4
                                        -----------


(1)  Names of reporting persons.                            Occidental Oil and
                                                            Gas Holding
                                                            Corporation
     I.R.S. Identification Nos. of above persons            95-2864974
     (entities only).

(2)  Check the appropriate box if a member of a group       (a)

     (see instructions)                                     (b)

(3)  SEC use only.

(4)  Source of funds (see instructions).                    OO

(5)  Check if disclosure of legal proceedings is
     required pursuant to Items 2(d) or 2(e).

(6)  Citizenship or place of organization.                  California

Number of shares beneficially owned by each reporting
person with:

     (7)  Sole voting power.

     (8)  Shared voting power.                              6,101,010

     (9)  Sole dispositive power.

     (10) Shared dispositive power.                         6,101,010

(11) Aggregate amount beneficially owned by each            6,101,010
     reporting person

(12) Check if the aggregate amount in Row (11)
     excludes certain shares (see instructions).

(13) Percent of class represented by amount in Row          10.6%
     (11).

(14) Type of reporting person (see instructions).           CO


                               Page 6 of 20 Pages



                              CUSIP No. 74045Q 10 4
                                        -----------


(1)  Names of reporting persons.                            Occidental Petroleum
                                                            Investment Co.
     I.R.S. Identification Nos. of above persons            95-2584267
     (entities only).

(2)  Check the appropriate box if a member of a group       (a)

     (see instructions)                                     (b)

(3)  SEC use only.

(4)  Source of funds (see instructions).                    OO

(5)  Check if disclosure of legal proceedings is
     required pursuant to Items 2(d) or 2(e).

(6)  Citizenship or place of organization.                  California

Number of shares beneficially owned by each reporting
person with:

     (7)  Sole voting power.

     (8)  Shared voting power.                              6,101,010

     (9)  Sole dispositive power.

     (10) Shared dispositive power.                         6,101,010

(11) Aggregate amount beneficially owned by each            6,101,010
     reporting person

(12) Check if the aggregate amount in Row (11)
     excludes certain shares (see instructions).

(13) Percent of class represented by amount in Row          10.6%
     (11).

(14) Type of reporting person (see instructions).           PN


                               Page 7 of 20 Pages



ITEM 1.  SECURITY AND ISSUER.

Title of class of equity security:           Common Stock

Issuer:                                      Premcor Inc.

Address of principal executive offices:      1700 East Putnam Street, Suite 500
                                             Old Greenwich, Connecticut 06870


ITEM 2.  IDENTITY AND BACKGROUND.

Occidental Petroleum Corporation ("Occidental"):
- ------------------------------------------------

     state of organization:        Delaware

     principal business:           engaged, through its subsidiaries and
                                   affiliates, in the production, development
                                   and marketing of natural resources and
                                   chemicals

     principal business address:   10889 Wilshire Boulevard
                                   Los Angeles, California 90024

Occidental C.O.B. Partners ("OXY Partners"):
- --------------------------------------------

     state of organization:        Delaware

     principal business:           general partnership, formed to engage in
                                   buying, selling, delivering and dealing in
                                   crude oil, and in any and all lawful
                                   activities directly or indirectly related or
                                   incidental to that business

     principal business address:   110 West 7th Street
                                   P.O. Box 300
                                   Tulsa, Oklahoma 74102

Placid Oil Company ("Placid"):
- ------------------------------

     state of organization:        Delaware

     principal business:           oil and gas exploration and production in the
                                   United States Gulf Coast, Canada and the
                                   Netherlands

     principal business address:   10889 Wilshire Boulevard
                                   Los Angeles, California 90024


                               Page 8 of 20 Pages



OXY USA Inc. ("OXY USA"):
- -------------------------

     state of organization:        Delaware

     principal business:           domestic oil and gas exploration and
                                   production

     principal business address:   5 Greenway Plaza
                                   Houston, Texas 77046

Occidental Oil and Gas Holding Corporation ("OOGHC"):
- -----------------------------------------------------

     state of organization:        California

     principal business:           holding company for oil and gas entities

     principal business address:   10889 Wilshire Boulevard
                                   Los Angeles, California 90024

Occidental Petroleum Investment Co. ("OPIC"):
- ---------------------------------------------

     state of organization:        California

     principal business:           holding company

     principal business address:   10889 Wilshire Boulevard
                                   Los Angeles, California 90024


     The name, business address and current principal occupation or employment
of each of the executive officers and directors of Occidental, Placid, OXY USA,
OOGHC, and OPIC (collectively, the "Companies") are set forth below. Unless
otherwise indicated, the business address of each such person is 10889 Wilshire
Boulevard, Los Angeles, California 90024. All such persons listed below are
citizens of the United States except Mr. Syriani, who is a citizen of Lebanon;
Dr. Segovia, who is a citizen of Colombia; and Mr. Feick, who is a citizen of
Canada. Unless otherwise indicated, each occupation set forth opposite an
individual's name refers to employment with Occidental. Directors of Occidental
are identified by an asterisk (*).

Name and Business Address             Present Principal Occupation or Employment
- -------------------------             ------------------------------------------

Ray R. Irani*                         Chairman of the Board and Chief Executive
                                      Officer of Occidental

Dale R. Laurance*(4)                  President of Occidental; Chairman of the
                                      Board, President and Chief Executive
                                      Officer of OOGHC

Ronald W. Burkle*                     Managing Partner and majority owner of The
9130 West Sunset Boulevard            Yucaipa Companies
Los Angeles, California 90069


                               Page 9 of 20 Pages


Name and Business Address             Present Principal Occupation or Employment
- -------------------------             ------------------------------------------

John S. Chalsty*                      Senior Advisor, Credit Suisse First Boston
11 Madison Avenue
New York, New York 10010

Edward P. Djerejian*                  Director, James A. Baker III Institute for
Rice University, MS-40                Public Policy
6100 Main Street
Houston, Texas 77005-1892

John E. Feick*                        President and Chief Executive Officer of
230, 319-2nd Avenue, SW               Matrix Solutions, Inc.
Calgary, Alberta, Canada T2P OC5

Irvin W. Maloney*                     Retired Chairman and Chief Executive
                                      Officer, Dataproducts Corporation

Rudolfo Segovia*                      Member of Executive Committee of
Carrera 9A No. 99-02 OF. 1001         Inversiones Sanford
Santafe de Bogota, D.C. Colombia

Aziz D. Syriani*                      President and Chief Operating Officer of
505 Park Avenue - 11th Floor          The Olayan Group
New York, New York 10022

Rosemary Tomich*                      Owner of the Hope Cattle Company and the
                                      A.S. Tomich Construction Company; Chairman
                                      of the Board of Directors and Chief
                                      Executive Officer, Livestock Clearing,
                                      Inc.

Stephen I. Chazen                     Chief Financial Officer and Executive Vice
                                      President - Corporate Development of
                                      Occidental; Executive Vice President of
                                      Placid; Executive Vice President of OXY
                                      USA; Executive Vice President of OOGHC

Donald P. de Brier                    Executive Vice President, Secretary and
                                      General Counsel of Occidental

Richard W. Hallock                    Executive Vice President - Human Resources
                                      of Occidental

J. Roger Hirl                         Executive Vice President of Occidental
5005 LBJ Freeway
Dallas, Texas 75244


                              Page 10 of 20 Pages



Name and Business Address             Present Principal Occupation or Employment
- -------------------------             ------------------------------------------

John W. Morgan (1)(2)                 Executive Vice President - Operations of
                                      Occidental; President of Placid; President
                                      of OXY USA; Executive Vice President -
                                      Worldwide Production of OOGHC; Vice
                                      President of OPIC

S. P. Dominick, Jr.                   Vice President and Controller of
                                      Occidental; Vice President and Controller
                                      of OPIC

J. R. Havert                          Vice President and Treasurer of
                                      Occidental; Vice President and Treasurer
                                      of Placid; Vice President and Treasurer of
                                      OXY USA; Vice President and Treasurer of
                                      OOGHC; Vice President and Treasurer of
                                      OPIC

Kenneth J. Huffman                    Vice President - Investor Relations of
                                      Occidental

Anthony R. Leach                      Vice President - Finance of Occidental;
                                      President of OPIC

Robert M. McGee                       Vice President of Occidental

Lawrence P. Meriage                   Vice President - Communications and Public
                                      Affairs of Occidental; Vice President -
                                      Communications and Public Affairs of OOGHC

Donald L. Moore                       Vice President and Chief Information
5 East Greenway Plaza                 Officer of Occidental
Houston, Texas 77046-0504

R. Casey Olson                        Vice President of Occidental; Executive
5 East Greenway Plaza                 Vice President - Business Development of
Houston, Texas 77046-0504             Placid; Executive Vice President of OXY
                                      USA; Executive Vice President of OOGHC

Richard A. Swan                       Vice President - Health, Environment and
                                      Safety of Occidental

Aurmond A. Watkins, Jr.               Vice President - Tax of Occidental; Vice
                                      President of OXY USA

Jim A. Leonard (1)(2)(3)(4)           Senior Assistant Controller of Occidental;
                                      Senior Vice President - Finance of Placid;
                                      Senior Vice President - Finance of OXY
                                      USA; Senior Vice President - Finance of
                                      OOGHC


                              Page 11 of 20 Pages



Name and Business Address             Present Principal Occupation or Employment
- -------------------------             ------------------------------------------

Michael L. Preston (1)(2)(3)          Vice President and General Counsel of
                                      OOGHC; Vice President and General Counsel
                                      of Placid; Vice President and General
                                      Counsel of OXY USA

John M. Winterman                     Executive Vice President - Worldwide
5 East Greenway Plaza                 Exploration and Business Development of
Houston, Texas 77046-0504             OOGHC; Executive Vice President -
                                      Exploration of Placid; Executive Vice
                                      President - Worldwide Exploration of OXY
                                      USA

James S. Lyerly                       Senior Vice President - Financial Planning
                                      and Analysis of OOGHC; Senior Vice
                                      President - Financial Planning and
                                      Analysis of Placid; Senior Vice President
                                      - Financial Planning and Analysis of OXY
                                      USA

D. Bradley Childers                   Vice President - International Business
5 East Greenway Plaza                 Development of OOGHC; Vice President -
Houston, Texas 77046-0504             Business Development of Placid; Vice
                                      President - Business Development of OXY
                                      USA

Jo Ellen Drisko                       Vice President - Asset Management of OXY
2480 Fortune Drive, Suite 300         USA; Vice President - Asset Management of
Lexington, Kentucky 40509             Placid

D. Nathan Meehan                      Vice President - Engineering and Technical
5 East Greenway Plaza                 Services of OOGHC; Vice President -
Houston, Texas 77046-0504             Engineering of Placid; Vice President -
                                      Engineering of OXY USA

Patrick Oenbring                      Vice President - Permian Basin of OXY USA;
580 Westlake Park Boulevard           Vice President - Permian Basin of Placid
Houston, Texas 77079

Paul A. Parsons                       Vice President - Finance of Placid
580 Westlake Park Boulevard
Houston, Texas 77079

Linda S. Peterson (4)                 Assistant Secretary of Occidental; Vice
                                      President and Secretary of Placid; Vice
                                      President and Secretary of OXY USA; Vice
                                      President and Secretary of OOGHC;
                                      Assistant Secretary of OPIC

Stephen J. Pettit                     Assistant Secretary of OXY USA; Assistant
580 Westlake Park Boulevard           Secretary and Vice President of Placid
Houston, Texas 77079


                              Page 12 of 20 Pages



Name and Business Address             Present Principal Occupation or Employment
- -------------------------             ------------------------------------------

Damir Vrcek                           Vice President of OXY USA; Vice President
5 East Greenway Plaza                 of Placid
Houston, Texas 77046-0504

Antonio D'Amico                       Vice President and General Counsel of
                                      OOGHC

Peter G. Vincent                      Vice President - Human Resources of OOGHC

John W. Alden (4)                     Assistant Treasurer and Assistant
                                      Secretary of Occidental; Vice President
                                      and Secretary of OPIC

- ------------------
(1)      Director of Placid
(2)      Director of OXY USA
(3)      Director of OOGHC
(4)      Director of OPIC


     During the last five years none of the Companies or the natural persons
named above (a) has been convicted in a criminal proceeding (excluding traffic
violations or similar misdemeanors) (b) was a party to a civil proceeding of a
judicial or administrative body of competent jurisdiction and as a result of
such proceeding was or is subject to a judgment, decree or final order enjoining
future violations of, or prohibiting or mandating activities subject to, federal
or state securities laws or finding any violation with respect to such laws.


ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

     On June 6, 2002, pursuant to a Warrant Exercise and Share Exchange
Agreement, dated as of April 26, 2002 (the "Exercise and Exchange Agreement"),
by and among Occidental Petroleum corporation ("Occidental") Oxy C.O.B.Partners,
a Delaware general partnership ("Oxy Partners"), Blackstone Capital Partners III
Merchant Banking Fund L.P., a Delaware limited partnership, Blackstone Offshore
Capital Partners III L.P., a Delaware limited partnership, Blackstone Family
Investment Partnership III L.P., a Delaware limited partnership, Premcor and
Sabine River Holding Corp., a Delaware corporation ("Sabine") and a
majority-owned subsidiary of Premcor, Occidental exchanged 681,818 shares of the
Common Stock of Sabine for 1,363,636 shares of Premcor Common Stock.

     The remaining 6,371,010 shares of Premor Common Stock held by Occidental
and its affiliate, Oxy Partners, were acquired from Premcor in a series of
transactions beginning in 1995 prior to Premcor becoming a publicly traded
company.


                              Page 13 of 20 Pages



ITEM 4.  PURPOSE OF TRANSACTION.

     Directly and through Oxy Partners, Occidental currently holds its Premcor
Shares for investment purposes only with a view toward maximizing long-term
shareholder value for Occidental's shareholders and not for the purpose of
controlling Premcor.

     Other than as set forth in Item 6 of this Schedule 13 D, Occidental
currently has no plans which relate to or would result in or any of the actions
listed in clauses (a) through (j) of Item 4 of Schedule 13D. However, Occidental
reviews and analyzes on a continuing basis its investments in each of its
subsidiaries and other operations, including the Premcor Shares, in order to
determine whether shareholder value for Occidental's shareholders is better
served by holding those investments, increasing or disposing of or monetizing
those investments or recapitalizing or otherwise restructuring those
investments. With respect to the Premcor Shares, these reviews and analyses are
based upon a variety of factors, including without limitation, the price of, and
other market conditions relating to, the Premcor Shares, the investment return
on the Premcor Shares, Premcor's business and prospects, other investment and
business opportunities available to Occidental, general stock market and
economic conditions, tax considerations and other factors deemed relevant.


ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER.

(a)  Occidental:         aggregate number of shares held:             7,734,646
     -----------         percentage of class:                             13.5%

     Oxy Partners:       aggregate number of shares held:             6,101,010
     -------------       percentage of class:                             10.6%

     Placid:             aggregate number of shares held:             6,101,010
     -------             percentage of class:                             10.6%

     OXY USA:            aggregate number of shares held:             6,101,010
     --------            percentage of class:                             10.6%

     OOGHC:              aggregate number of shares held:             6,101,010
     ------              percentage of class:                             10.6%

     OPIC:               aggregate number of shares held:             6,101,010
     -----               percentage of class:                             10.6%

                                                                          
(b)  Occidental:         sole power to vote or direct the vote:                 1,633,636
     -----------         shared power to vote or direct the vote:               6,101,010
                         sole power to dispose or direct the disposition:       1,633,636
                         shared power to dispose or direct the disposition:     6,101,010
Page 14 of 20 Pages Oxy Partners: sole power to vote or direct the vote: 0 ------------- shared power to vote or direct the vote: 6,101,010 sole power to dispose or direct the disposition: 0 shared power to dispose or direct the disposition: 6,101,010 Placid: sole power to vote or direct the vote: 0 ------- shared power to vote or direct the vote: 6,101,010 sole power to dispose or direct the disposition: 0 shared power to dispose or direct the disposition: 6,101,010 OXY USA: sole power to vote or direct the vote: 0 -------- shared power to vote or direct the vote: 6,101,010 sole power to dispose or direct the disposition: 0 shared power to dispose or direct the disposition: 6,101,010 OOGHC: sole power to vote or direct the vote: 0 ------ shared power to vote or direct the vote: 6,101,010 sole power to dispose or direct the disposition: 0 shared power to dispose or direct the disposition: 6,101,010 OPIC: sole power to vote or direct the vote: 0 ----- shared power to vote or direct the vote: 6,101,010 sole power to dispose or direct the disposition: 0 shared power to dispose or direct the disposition: 6,101,010
(c) On April 29, 2002, as part of a reorganization of Premcor, and pursuant to a Warrant Exercise and Share Exchange Agreement, dated as of April 26, 2002 (the "Exercise and Exchange Agreement"), by and among Occidental Oxy Partners, Blackstone Capital Partners III Merchant Banking Fund L.P., a Delaware limited partnership, Blackstone Offshore Capital Partners III L.P., a Delaware limited partnership, Blackstone Family Investment Partnership III L.P., a Delaware limited partnership, Premcor and Sabine, Occidental exercised a warrant to acquire 30,00 shares of the Common Stock of Sabine for an aggregate exercise price of $2,700 (two thousand seven hundred dollars), and exchanged the shares so acquired for 270,000 shares of the Common Stock of Premcor. Occidental also agreed to exchange its 681,818 shares of the Common Stock of Sabine for 1,363,636 shares of Premcor Common Stock if Premcor at some future date completed a restructuring of the debt with respect to the Port Arthur coking unit (the "PACC Restructuring"). In addition, on that date, Oxy Partners exchanged its 6,101,010 shares of Class F Common Stock for 6,101,010 shares of Common Stock. On June 6, 2002, Premcor completed the PACC Restructuring and Occidental exchanged its Sabine shares for 1,363,636 shares of Premcor Common Stock. ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO SECURITIES OF THE ISSUER. Pursuant to the Second Amended and Restated Stockholders' Agreement, dated as of November 3, 1997 (the "Amended Stockholders' Agreement"), between Oxy Partners and Page 15 of 20 Pages Premcor, which by the terms of Exercise and Exchange Agreement became applicable to the Premcor Shares acquired by Occidental upon Exchange of its Sabine Shares, the Premcor Shares held by Occidental and its affiliates are not transferable except in compliance with the Amended Stockholders' Agreement. In addition, the Amended Stockholders' Agreement (i) provides that, so long as Occidental and its affiliates own at least 10% of the fully diluted shares of Premcor, Occidental has the right to designate one director for election to the board, (ii) gives Premcor a right of first refusal to acquire the shares in the event Occidental receives an offer from a third party to purchase the shares for cash or cash equivalents, and (iii) grants registration rights to Occidental if Premcor is a public company. Except for the Stockholders' Agreement, there are currently no other effective contracts, arrangements, understandings or relationships (legal or otherwise) among the persons named in Item 2 and between such person and any other person with respect to any securities of Premcor. ITEM 7. MATERIAL TO BE FILED AS EXHIBITS. Exhibit 1 Agreement Pursuant to Rule 13d-1(k) Exhibit 2 Second Amended and Restated Stockholders' Agreement, dated as of November 3, 1997, between Oxy Partners and Premcor, Inc. Exhibit 3 Form of Warrant Exercise and Share Exchange Agreement, dated as of April 26, 2002 (the "Exercise and Exchange Agreement"), by and among Occidental Oxy Partners, Blackstone Capital Partners III Merchant Banking Fund L.P., a Delaware limited partnership, Blackstone Offshore Capital Partners III L.P., a Delaware limited partnership, Blackstone Family Investment Partnership III L.P., a Delaware limited partnership, Premcor and Sabine Page 16 of 20 Pages SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. June 17, 2002 OCCIDENTAL PETROLEUM CORPORATION By: /s/ STEPHEN I. CHAZEN ------------------------------------------------- Name: Stephen I. Chazen Title: Chief Financial Officer and Executive Vice President - Corporate Development OCCIDENTAL C.O.B. PARTNERS by OXY USA Inc., its managing partner By: /s/ STEPHEN I. CHAZEN ------------------------------------------------- Name: Stephen I. Chazen Title: Executive Vice President PLACID OIL COMPANY By: /s/ STEPHEN I. CHAZEN ------------------------------------------------- Name: Stephen I. Chazen Title: Executive Vice President OXY USA INC. By: /s/ STEPHEN I. CHAZEN ------------------------------------------------- Name: Stephen I. Chazen Title: Executive Vice President OCCIDENTAL OIL AND GAS HOLDING CORPORATION By: /s/ STEPHEN I. CHAZEN ------------------------------------------------- Name: Stephen I. Chazen Title: Executive Vice President Page 17 of 20 Pages OCCIDENTAL PETROLEUM INVESTMENT CO. By: /s/ J. R. HAVERT ------------------------------------------------- Name: J. R. Havert Title: Vice President and Treasurer Page 18 of 20 Pages



                                                                       EXHIBIT 1

                                    AGREEMENT

     Pursuant to Rule 13d-1(k) promulgated under the Securities Exchange Act of
1934, as amended, the undersigned agree that the Schedule 13D to which this
Agreement is attached as Exhibit 1 is filed on behalf of each of us. This
Agreement may be executed in two or more counterparts, each of which shall be
deemed an original, but all of which together shall constitute one and the same
agreement.


June 17, 2002               OCCIDENTAL PETROLEUM CORPORATION


                            By:  /s/ STEPHEN I. CHAZEN
                               -------------------------------------------------
                               Name:  Stephen I. Chazen
                               Title: Chief Financial Officer and Executive Vice
                                      President - Corporate Development


                            OCCIDENTAL C.O.B. PARTNERS
                            by OXY USA Inc., its managing partner


                            By:  /s/ STEPHEN I. CHAZEN
                               -------------------------------------------------
                               Name:  Stephen I. Chazen
                               Title: Executive Vice President


                            PLACID OIL COMPANY


                            By:  /s/ STEPHEN I. CHAZEN
                               -------------------------------------------------
                               Name:  Stephen I. Chazen
                               Title: Executive Vice President


                            OXY USA INC.


                            By:  /s/ STEPHEN I. CHAZEN
                               -------------------------------------------------
                               Name:  Stephen I. Chazen
                               Title: Executive Vice President


                                 Page 19 of 20 Pages



                            OCCIDENTAL OIL AND GAS HOLDING CORPORATION


                            By:  /s/ STEPHEN I. CHAZEN
                               -------------------------------------------------
                               Name:  Stephen I. Chazen
                               Title: Executive Vice President


                            OCCIDENTAL PETROLEUM INVESTMENT CO.


                            By:  /s/ J. R. HAVERT
                               -------------------------------------------------
                               Name:  J. R. Havert
                               Title: Vice President and Treasurer


                              Page 20 of 20 Pages



                         SECONDED AMENDED AND RESTATED

                            STOCKHOLDERS' AGREEMENT

                                    between

                                CLARK USA, INC.

                                      and

                          OCCIDENTAL C.O.B. PARTNERS



                         Dated as of November 3, 1997



                               TABLE OF CONTENTS

Page ---- ARTICLE I DEFINITIONS SECTION 1.01. Certain Defined Terms........................................ 1 ARTICLE II CORPORATE GOVERNANCE SECTION 2.01. Composition of the Board..................................... 6 SECTION 2.02. Removal...................................................... 6 SECTION 2.03. Vacancies.................................................... 7 ARTICLE III TRANSFER OF SHARES SECTION 3.01. General Restriction.......................................... 7 SECTION 3.02. Legends...................................................... 7 SECTION 3.03. Certain Restrictions on Transfer............................. 8 SECTION 3.04. Right of First Refusal....................................... 9 SECTION 3.05. Transferees to Execute Agreement............................. 11 SECTION 3.06. [RESERVED] SECTION 3.07. [RESERVED] SECTION 3.08. Improper Sale or Encumbrance................................. 12 ARTICLE IV ADDITIONAL AGREEMENTS SECTION 4.01. Registration Rights.......................................... 12 SECTION 4.02. Incidental Registration...................................... 14 SECTION 4.03. Registration Procedures...................................... 15 SECTION 4.04. Preparation, Reasonable Investigation........................ 18 SECTION 4.05. Indemnification.............................................. 19 SECTION 4.06. Contribution................................................. 21
SECTION 4.07. Certain Information........................................ 23 ARTICLE V REPRESENTATIONS AND WARRANTIES OF THE PARTIES SECTION 5.01. Representations and Warranties of Each Party............... 23 ARTICLE VI MISCELLANEOUS SECTION 6.01. Notices.................................................... 24 SECTION 6.02. Public Announcements....................................... 25 SECTION 6.03. Headings................................................... 25 SECTION 6.04. Severability............................................... 25 SECTION 6.05. Entire Agreement........................................... 25 SECTION 6.06. Assignment................................................. 26 SECTION 6.07. Parties in Interest........................................ 26 SECTION 6.08. Amendment.................................................. 26 SECTION 6.09. Governing Law.............................................. 26 SECTION 6.10. Counterparts............................................... 26 SECTION 6.11. Specific Performance....................................... 26 SECTION 6.12. Termination................................................ 27
SECOND AMENDED AND RESTATED STOCKHOLDERS' AGREEMENT, dated as of November 3, 1997 (this "Agreement"), between CLARK USA, INC., a Delaware corporation (the "Company"), and OCCIDENTAL C.O.B. PARTNERS, a Delaware general partnership ("Oxy Partners" and, together with the Company, the "Parties"). WHEREAS, the Company and Oxy Partners have entered into a Stockholders' Agreement dated as of December 1, 1995; WHEREAS, the Company and Oxy Partners have entered into an Amended and Restated Stockholders' Agreement dated as of October 1, 1997 (the "First Amended and Restated Stockholders' Agreement"); WHEREAS, the Company and Oxy Partners desire to amend and restate the First Amended and Restated Stockholders' Agreement as provided herein; NOW, THEREFORE, in consideration of the premises and the mutual agreements and covenants hereinafter set forth, the Parties hereby agree as follows: ARTICLE I DEFINITIONS SECTION 1.01. Certain Defined Terms. As used in this Agreement, the following terms have the following meanings: "Accepting Party" has the meaning specified in Section 3.04(b). "affiliate" of a specified Person means a Person who, directly or indirectly through one or more intermediaries, controls, is controlled by, or is under common control with, such specified Person. "Agreement" means this Second Amended and Restated Stockholders' Agreement. "beneficial owner" or "beneficially own" has the meaning given such term in Rule 13d-3 under the Exchange Act as in effect on the date hereof; provided that beneficial ownership under Rule 13d-3(1)(i) shall be determined based on whether a Person has a right to acquire beneficial ownership within 60 days or thereafter. "Board" means the Board of Directors of the Company. "Business Day" means any day that is not a Saturday, a Sunday or other day on which 2 banks are required or authorized by law to be closed in the City of New York. "Capital Stock" means, with respect to any Person at any time, any and all shares, interests, participation or other equivalents (however designated, whether voting or non-voting) of capital stock, partnership interests (whether general or limited) or equivalent ownership interests in or issued by such Person and any and all warrants, options or other rights to purchase or acquire any of the foregoing. "Cash Equivalents" means (a) marketable direct obligations issued or unconditionally guaranteed by the United States government or issued by any agency thereof and backed by the full faith and credit of the United States, in each case maturing within one year from the date of acquisition thereof, (b) marketable direct obligations issued by any state of the United States or any political subdivision of any such state or any public instrumentality thereof maturing within one year from the date of acquisition thereof and, at the time of acquisition, having the highest rating obtainable from any of Standard & Poor's Corporation, Moody's Investors Service, Inc. or Duff & Phelps Credit Rating Co. or (c) commercial paper maturing not more than one year from the date of issuance thereof and, at the time of acquisition, having the highest rating obtainable from either Standard & Poor's Corporation or Moody's Investors Service, Inc. "Cause" has the meaning specified in Section 2.02(c). "Clark Capital Stock" means the Common Stock, Class A Common Stock, Class D Common Stock, Class E Common Stock, Class F Common Stock and Preferred Stock. "Class A Common Stock" means the Class A Common Stock, par value $.01 per share, of the Company. "Class D Common Stock" means the Class D Common Stock, par value $.01 per share, of the Company. "Class E Common Stock" means the Class E Common Stock, par value $.01 per share, of the Company. "Class F Common Stock" means the Class F Common Stock, par value $.01 per share, of the Company. "Common Stock" means the Common Stock, par value $.01 per share, of the Company. "Company" means Clark USA, Inc., a Delaware corporation. "control" (including the terms "controlled by" and "under common control with"), with 3 respect to the relationship between or among two or more Persons, means the possession, directly or indirectly or as trustee or executor, of the power to direct or cause the direction of the affairs or management of a Person, whether through the ownership of voting securities, as trustee or executor, by contract or otherwise. "Director" means a member of the Board. "Encumbrance" means any security interest, lien, claim, pledge, limitation on voting rights, charge or other encumbrance of any nature whatsoever. "Exchange Act" means the Securities Exchange Act of 1934, as amended. "Fully Diluted Shares" as of any date means the aggregate of (i) the number of Shares issued and outstanding as of such date (other than Shares held in the treasury of the Company or held by any Subsidiary of the Company) and (ii) the number of Shares issuable as of such date upon (x) the exercise of any then exercisable outstanding options, warrants or similar instruments (other than any such instruments held by the Company or any Subsidiary of the Company) and (y) the exercise of any then exercisable conversion or exchange rights (other than any such rights held by the Company or any Subsidiary of the Company). "Governmental Entity" means any administrative, governmental or regulatory authority or body or any court or tribunal, domestic or foreign. "Laws" means any federal, state, local or foreign law, statute, ordinance, rule, regulation, order, judgment or decree. "Marketable Securities" means securities that are (a) (i) securities of or other interests in any Person that are traded on a national securities exchange, reported on by NASDAQ or otherwise actively traded over-the-counter or (ii) debt securities of a Person that has debt or equity securities that are so traded or so reported on and in which a nationally recognized securities firm has agreed to make a market, and (b) not subject to restrictions on transfer as a result of any applicable contractual provisions or the provisions of the Securities Act or any other applicable Law. "Minimum Sale Price" has the meaning specified in Section 3.04(d). "NASDAQ" means the National Association of Securities Dealers, Inc. National Market System. "Nominee" has the meaning specified in Section 2.03(a). 4 "Notice of Acceptance" has the meaning specified in Section 3.04(b). "Offer" has the meaning specified in Section 3.04(a). "Offer Notice" has the meaning specified in Section 3.04(a). "Offer Notice Date" has the meaning specified in Section 3.04(b). "Offer Period" has the meaning specified in Section 3.04(b). "Offer Price" has the meaning specified in Section 3.04(a). "Offered Shares" has the meaning specified in Section 3.04(a). "Other Stockholders" means all of the stockholders of the Company, except for Oxy Partners, who shall agree to be bound by Article II hereof. "Oxy Director" has the meaning specified in Section 2.01. "Oxy Partners" means Occidental C.O.B. Partners, a Delaware general partnership "Oxy Shares" means the Shares owned from time to time by Oxy Partners and any Person to whom any of such shares are transferred from time to time. "Oxy Sub" means Occidental C.O.B. Co., Inc., a Delaware corporation. "Parties" means the Company and Oxy Partners. "Permitted Assignees" has the meaning specified in Section 3.04(b). "Permitted Transferee" means (a) the Company or any Subsidiary of the Company, (b) Oxy Partners or (c) any affiliate of Oxy Partners; provided, however, that any such affiliate shall cease to be a Permitted Transferee in the event it shall cease to be an affiliate of Oxy Partners. "Person" means an individual, partnership, corporation (including a business trust), limited liability company, joint stock company, trust, unincorporated association, joint venture or other entity, or a government or any political subdivision or agency thereof. "Preferred Stock" means the preferred stock, par value $0.01 per share, of the Company. "Prospective Seller" has the meaning specified in Section 3.04(a). 5 "Prospective Transferee" has the meaning specified in Section 3.05(a). "Public Offering" means an underwritten public offering of equity securities of the Company pursuant to a registration statement that has been declared effective by the SEC under the Securities Act, in which such equity securities are widely distributed and after which such equity securities are traded on a national securities exchange or reported on by NASDAQ. "Recapitalization" means any stock split, dividend or combination, or any recapitalization, merger, consolidation, exchange or other similar reorganization. "Restricted Shares" means all Shares other than (a) Shares that have been registered under a registration statement pursuant to the Securities Act, (b) Shares with respect to which a Sale has been made in reliance on and in accordance with Rule 144 and (c) Shares with respect to which the holder thereof shall have delivered to the Company either (i) an opinion, in form and substance reasonably satisfactory to the Company, of counsel, who shall be reasonably satisfactory to the Company, or (ii) a "no action" letter from the staff of the SEC, to the effect that subsequent transfers of such Shares may be effected without registration under the Securities Act or compliance with Rule 144. "Rule 144" means Rule 144 (or any successor provision) under the Securities Act. "Rule 144 Transaction" means any Sale of Oxy Shares made in reliance upon Rule 144 (as in effect on the date hereof) that complies with paragraphs (d), (e), (f) and (g) thereof (as in effect on the date hereof); provided that, if, at the time of such Sale, the seller would otherwise be entitled to rely upon paragraph (k) of Rule 144 in connection with such Sale, the number of Oxy Shares included in such Sale, together with all other Sales of Oxy Shares by such seller and its affiliates within any three-month period that includes the date of such Sale, shall not exceed 1,500,000 Oxy Shares. "Sale" means any sale, assignment, transfer, distribution or other disposition of Shares or of a participation therein, whether voluntarily or by operation of law. "SEC" means the Securities and Exchange Commission, and any successor commission or agency having similar powers. "Securities Act" means the Securities Act of 1933, as amended. "Share" means any share of Clark Capital Stock and any securities issued in respect thereof, or in substitution therefor, in connection with any Recapitalization. "Stockholder" means each Person (other than the Company) who shall be a party to this 6 Agreement, whether in connection with the execution and delivery hereof as of the date hereof, pursuant to Section 3.05, or otherwise (other than any Person who is a signatory to this Agreement solely for purposes of being bound by Article II), so long as such Person shall beneficially own any Shares or any options, warrants or similar rights to acquire Shares. "Subsidiary" means, with respect to any Person, any corporation, partnership, limited liability company, joint venture, association or other entity controlled by such Person directly or indirectly through one or more intermediaries. "Third Party" means, with respect to any Stockholder, any other Person other than a Permitted Transferee. "Trading Day" has the meaning specified in Section 3.04(g). ARTICLE II CORPORATE GOVERNANCE SECTION 2.01. Composition of the Board. So long as Oxy Partners and its affiliates own in the aggregate at least 10% of the Fully Diluted Shares, Oxy Partners shall be entitled to designate one Director for election to the Board (the "Oxy Director"). Each Other Stockholder then entitled to vote for the election of Directors to the Board shall vote all voting Shares owned or held of record by such Person at any meeting of stockholders of the Company, or execute a written consent with respect to all such Shares owned or held of record by such Person, in favor of the election of the Oxy Director as a Director. In the event Oxy Partners and its affiliates shall at any time not own in the aggregate at least 10% of the Fully Diluted Shares, Oxy Partners and such affiliates shall cause the Oxy Director to tender his or her written resignation as a Director to the Secretary of the Company as soon as practicable. SECTION 2.02. Removal. (a) Upon the written request of Oxy Partners, each Other Stockholder shall vote all of his, her or its voting Shares in favor of the removal of the Oxy Director. Each of the Other Stockholders agrees that, if, at any time, he, she or it is then entitled to vote for the removal of Directors, he, she or it will not vote any of his, her or its voting Shares in favor of the removal of the Oxy Director unless such removal shall be for Cause (as defined below) or Oxy Partners shall have consented to or directed such removal in writing. (b) Upon the written request of an Other Stockholder that designated a Director, each Stockholder shall vote all of his, her or its voting Shares in favor of the removal of such Director. Each Stockholder agrees that, if, at any time, he, she or it is then entitled to vote for the removal of Directors, he, she or it will not vote any of his, her or its voting Shares in favor of the removal 7 of a Director designated by any of the Other Stockholders unless the Other Stockholder that designated such Director to the Board shall have consented to or directed such removal in writing. (c) Removal for "Cause" shall mean removal of a Director because of such Director's (a) willful and continued failure to substantially perform his or her duties as a Director, (b) willful conduct which is significantly injurious to the Company, monetarily or otherwise, (c) conviction for, or guilty plea to, a felony or a crime involving moral turpitude or (d) abuse of illegal drugs or other controlled substances or habitual intoxication. SECTION 2.03. Vacancies. (a) If, as a result of death, disability, retirement, resignation, removal (with or without Cause) or otherwise, there shall exist or occur any vacancy on the Board due to the absence of a Director who shall have been designated pursuant to Section 2.01, and the requirements of Section 2.01 shall remain satisfied in all respects, (i) Oxy Partners may designate, in a writing executed by Oxy Partners, another individual to fill such vacancy and to serve as a Director (the "Nominee") and (ii) each Other Stockholder then entitled to vote for the election of Directors shall vote his, her or its voting Shares at any meeting of stockholders of the Company, or execute a written consent with respect to all such Shares, as the case may be, in favor of the election of the Nominee as a Director. (b) If, as a result of death, disability, retirement, resignation, removal (with or without Cause) or otherwise, there shall exist or occur any vacancy on the Board due to the absence of a Director who shall have been designated by one of the Other Stockholders, (i) the Other Stockholder who designated such director may designate, in a writing executed by such Other Stockholder, a Nominee and (ii) each Stockholder shall vote his, her or its voting Shares at any meeting of stockholders of the Company, or execute a written consent with respect to all such Shares, as the case may be, in favor of the election of the Nominee as a Director. ARTICLE III TRANSFER OF SHARES SECTION 3.01. General Restriction. No Stockholder shall, directly or indirectly, make or solicit any Sale of, or create, incur, assume or suffer to exist any Encumbrance with respect to, any Oxy Share beneficially owned by such Stockholder, except in compliance with the Securities Act and the rules and regulations thereunder and this Agreement. SECTION 3.02. Legends. (a) The Company shall affix to each certificate evidencing Oxy Shares issued to Stockholders a legend in substantially the following form: 8 "THE SECURITIES EVIDENCED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED. NO REGISTRATION OF TRANSFER OF SUCH SECURITIES WILL BE MADE ON THE BOOKS OF THE ISSUER UNLESS SUCH TRANSFER IS MADE IN CONNECTION WITH AN EFFECTIVE REGISTRATION STATEMENT UNDER SUCH ACT OR PURSUANT TO AN EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF SUCH ACT OR SUCH ACT DOES NOT APPLY. THE SECURITIES EVIDENCED BY THIS CERTIFICATE ARE SUBJECT TO CERTAIN RESTRICTIONS ON TRANSFER AS SET FORTH IN AN AMENDED AND RESTATED STOCKHOLDERS' AGREEMENT DATED AS OF OCTOBER 1, 1997, AS IT MAY BE AMENDED FROM TIME TO TIME, A COPY OF WHICH IS ON FILE AT THE PRINCIPAL EXECUTIVE OFFICES OF THE ISSUER. NO REGISTRATION OF TRANSFER OF SUCH SECURITIES WILL BE MADE ON THE BOOKS OF THE ISSUER UNLESS AND UNTIL SUCH RESTRICTIONS SHALL HAVE BEEN COMPLIED WITH." (b) In the event that any Oxy Shares shall cease to be Restricted Shares, the Company shall, upon the written request of the holder thereof, issue to such holder a new certificate evidencing such Oxy Shares without the first paragraph of the legend required by Section 3.02(a) endorsed thereon. (c) In the event that any Oxy Shares shall cease to be subject to the restrictions on transfer set forth in this Agreement as provided in Section 3.03(b), the Company shall, upon the written request of the holder thereof, issue to such holder a new certificate evidencing such Oxy Shares without the second paragraph of the legend required by Section 3.02(a) endorsed thereon. SECTION 3.03. Certain Restrictions on Transfer. (a) Each Stockholder agrees that it will not, directly or indirectly, make or solicit any Sale of, or create, incur, assume or suffer to exist any Encumbrance (other than a pledge or hypothecation of Oxy Shares to one or more bona fide financial institutions and any foreclosure thereof, in each case subject to Section 3.05) with respect to, any Oxy Share beneficially owned by such Stockholder other than (i) any Sale to a Permitted Transferee, (ii) any Sale for cash, Cash Equivalents or Marketable Securities that is made in compliance with the procedures, and subject to the limitations, set forth in Section 3.04, (iii) any Sale pursuant to a Public Offering or (iv) any Sale in a Rule 144 Transaction. Notwithstanding the foregoing, except as otherwise expressly provided in this Agreement, all Sales permitted by the foregoing clauses (i) and (ii) shall be subject to, and shall not be made other than in compliance with, the provisions of Sections 3.01, 3.02 and 3.05. (b) The restrictions on transfer set forth in this Agreement shall cease to apply (i) as to any particular Oxy Shares at such time as such Oxy Shares are sold pursuant to a Public Offering or a Rule 144 Transaction and (ii) upon the termination of this Agreement. 9 SECTION 3.04. Right of First Refusal. (a) If any Stockholder receives from a Third Party dealing at arm's length a bona fide offer to purchase for cash, Cash Equivalents or Marketable Securities (an "Offer") any of the Oxy Shares owned or held by such Stockholder, and such Stockholder intends to sell such Oxy Shares to such Third Party, such Stockholder (for purposes of this Section 3.04, the "Prospective Seller") shall provide the Company written notice of such Offer (an "Offer Notice"). The Offer Notice shall identify the Third Party making the Offer, the number and class (or classes) of Oxy Shares with respect to which the Prospective Seller has such an Offer (the "Offered Shares"), the price per Offered Share at which a sale is proposed to be made, determined in accordance with Section 3.04(g) ("Offer Price"), the form of consideration in which the Offer Price is proposed to be paid, and all other material terms and conditions of the Offer. (b) The receipt of an Offer Notice by the Company from a Prospective Seller (the date of such receipt being referred to herein as the "Offer Notice Date") shall constitute an offer by such Prospective Seller to sell to the Company and any assignee or assignees of the Company ("Permitted Assignees") the Offered Shares at the Offer Price in cash. Such offer shall be irrevocable during the Offer Period (as hereinafter defined). The Company and any Permitted Assignees shall have the right to accept such offer as to any or all of the Offered Shares by giving a written notice of acceptance (the "Notice of Acceptance") to the Prospective Seller prior to the expiration of the Offer Period (the Company or any Permitted Assignee so accepting such offer, an "Accepting Party"); provided, however, that the Company and any Permitted Assignees shall provide a single Notice of Acceptance to the Prospective Seller and such Notice of Acceptance must accept the offer as to all of the Offered Shares on the same terms and conditions as the Offer (other than as expressly set forth herein). If the Company or any Permitted Assignee so accepts the Prospective Seller's offer, such Person will purchase for cash from the Prospective Seller, and the Prospective Seller will sell to such Accepting Party, such number of Offered Shares as to which such Accepting Party shall have accepted the Prospective Seller's offer (which must total, as to all Accepting Parties, all of the Offered Shares). The price per Offered Share to be paid by such Accepting Party shall be the Offer Price. The Notice of Acceptance shall specify (i) each Accepting Party's acceptance of the Prospective Seller's offer and (ii) the number of Offered Shares to be purchased by each Accepting Party. "Offer Period" means (i) in the event the Third Party making the Offer is engaged in the refining business, the twenty Business Day period commencing on the date the Offer Notice is received by the Company, or (ii) in all other cases, the ten Business Day period commencing on the date the Offer Notice is received by the Company. (c) The consummation of such purchases by and sales to the Accepting Parties shall take place on such date, not later than 90 days after receipt of the Offer Notice by the Company (or such longer period as may be specified in the Offer Notice), as the Accepting Parties and the Prospective Seller shall select. Upon the consummation of such purchase and sale, the Prospective Seller shall (i) deliver to the Accepting Party certificates evidencing the Offered 10 Shares purchased and sold duly endorsed in blank or accompanied by written instruments of transfer in form satisfactory to such Accepting Party duly executed by the Prospective Seller, and (ii) assign all its rights under this Agreement with respect to the Offered Shares purchased and sold pursuant to an instrument of assignment reasonably satisfactory to such Accepting Party. (d) In the event that (i) the Company shall have received an Offer Notice from a Prospective Seller but the Prospective Seller shall not have received from the Company and its Permitted Assignees a Notice of Acceptance with respect to all the Offered Shares prior to the expiration of the Offer Period or (ii) an Accepting Party shall have given a Notice of Acceptance to the Prospective Seller but such Accepting Party shall have failed to consummate, other than as a result of the fault of the Prospective Seller, a purchase of the Offered Shares with respect to which such Notice of Acceptance was given within 90 days after receipt of the Offer Notice by the Company (or such longer period as may be specified in the Offer Notice), such Prospective Seller shall have the right thereafter to make a sale of the Offered Shares so long as all the Offered Shares that are sold by the Prospective Seller (which number of Offered Shares shall be not less than the number of Offered Shares specified in such Offer Notice) are sold for cash, Cash Equivalents or Marketable Securities (i) within 180 days after the date of receipt of such Offer Notice by the Company, (ii) at an amount not less than the Minimum Sale Price (as hereinafter defined) and (iii) to the Third Party that made the Offer. "Minimum Sale Price" means (x) if the Prospective Seller's right to sell the Offered Shares results from the event described in clause (i) of the preceding sentence, (A) an amount equal to 97 percent of the Offer Price set forth in the Offer Notice if such sale is consummated within 30 days after the expiration of the Offer Period or (B) an amount equal to 95 percent of the Offer Price set forth in the Offer Notice if such sale is consummated thereafter, or (y) if the Prospective Seller's right to sell the Offered Shares results from the event described in clause (ii) of the preceding sentence, an amount equal to 90 percent of the Offer Price set forth in the Offer Notice. (e) In the event (i) that the Company shall have received an Offer Notice from a Prospective Seller, (ii) the Prospective Seller shall not have received a Notice of Acceptance for all the Offered Shares prior to the expiration of the Offer Period and (iii) such Prospective Seller shall not have sold the remaining Offered Shares before the expiration of the 180-day period in accordance with paragraph (d) above, then such Prospective Seller shall not give another Offer Notice for a period of 120 days after the last day of such 180-day period. (f) Anything in this Section 3.04 or in Section 3.03(a) to the contrary notwithstanding, the provisions of this Section 3.04 shall not be applicable to Sales of Clark Capital Stock described in clauses (i), (iii) and (iv) of Section 3.03(a). (g) For the purpose of determining the Offer Price with respect to an Offer that contemplates the payment of consideration in the form of Cash Equivalents or Marketable Securities, the value of such Cash Equivalents or Marketable Securities shall be determined as 11 set forth in this Section 3.04(g). The value of Cash Equivalents shall be the fair market value of such Cash Equivalents as of the Offer Notice Date as determined by a nationally recognized investment banking firm selected by the Company and reasonably acceptable to the Prospective Seller. The value of Marketable Securities shall be, if such securities are listed or admitted to trading on a national securities exchange, the average of the last sale prices for such securities during the twenty consecutive Trading Days preceding the Offer Notice Date, as reported in the principal consolidated transaction reporting system for securities listed on the principal national securities exchange on which such securities are listed or admitted to trading or, if such securities are not listed or admitted to trading on any national securities exchange, the average during the twenty consecutive Trading Days preceding the Offer Notice Date of the last quoted price or, if not so quoted, the average of the high bid and low asked prices in the over-the-counter market, as reported by NASDAQ or such other system then in use, or, if on any such date such shares are not quoted by any such organization, the average of the closing bid and asked prices as furnished by a professional market maker making a market in such shares selected by a majority of the Directors. If no market maker is making a market in such securities at such time, the fair value of such securities on the Offer Notice Date shall be determined in good faith by a nationally recognized investment banking firm selected by the Company and reasonably acceptable to the Prospective Seller (the fees and expenses of which shall be paid one-half by the Company and one-half by the Prospective Seller). If such securities are not publicly held or not so listed or traded, the value of such securities shall mean the fair value of such securities as of the Offer Notice Date as determined in good faith by a nationally recognized investment banking firm selected by the Company and reasonably acceptable to the Prospective Seller (the fees and expenses of which shall be paid one-half by the Company and one-half by the Prospective Seller), whose determination shall be conclusive for all purposes. The term "Trading Day" shall mean, if such securities are listed or admitted to trading on any national securities exchange, a day on which the principal national securities exchange on which such shares are listed or admitted to trading is open for the transaction of business or, if such shares are not so listed or admitted, a Business Day. SECTION 3.05. Transferees to Execute Agreement. (a) Each Stockholder agrees that it will not, directly or indirectly, make any Sale of, or create, incur, assume or suffer to exist any Encumbrance with respect to, any Oxy Shares beneficially owned by such Stockholder unless, contemporaneously with or prior to the consummation of any such Sale or the creation, incurrence, assumption or existence of such Encumbrance, the Person to whom such Sale is proposed to be made or the Person in whose favor such Encumbrance is proposed to be created, incurred, assumed or suffered to exist, in any case, (a "Prospective Transferee"), executes and delivers to the Company its written agreement, in form and substance reasonably satisfactory to the Company, whereby such Prospective Transferee (i) confirms that, with respect to the Oxy Shares that are the subject of such Sale or Encumbrance, it shall be deemed to be a Stockholder for purposes of this Agreement and agrees to be bound by all the terms of this Agreement, and (ii) represents and warrants that, upon the consummation of such Sale or the creation, incurrence, 12 assumption or existence of such Encumbrance, such agreement is a legal, valid and binding obligation of such Prospective Transferee enforceable against such Prospective Transferee in accordance with its terms, subject to the effect of any applicable bankruptcy, reorganization, insolvency, moratorium or similar laws affecting creditors' rights generally and subject, as to enforceability, to the effect of general principles of equity (regardless of whether such enforceability is considered in a proceeding in equity or at law). Upon the execution and delivery by such Prospective Transferee of the agreement referred to in the preceding sentence, such Prospective Transferee shall be deemed a Stockholder for purposes of this Agreement and shall have the rights and be subject to the obligations of a Stockholder under this Agreement, in each case with respect to the Oxy Shares beneficially owned by such Prospective Transferee or in respect of which such Encumbrance shall have been created, incurred, assumed or suffered to exist. (b) Anything in this Section 3.05 or in Section 3.03 to the contrary notwithstanding, the provisions of this Section 3.05 will not be applicable to any Sale of Oxy Shares pursuant to a Public Offering or a Rule 144 Transaction. SECTION 3.06. [RESERVED]. SECTION 3.07. [RESERVED]. SECTION 3.08. Improper Sale or Encumbrance. Any attempt not in compliance with this Agreement to make any Sale of, or create, incur or assume any Encumbrance with respect to, any Oxy Shares shall be null and void and of no force and effect, the purported transferee shall have no rights or privileges in or with respect to the Company, and the Company shall not give any effect in the Company's stock records to such attempted Sale or Encumbrance. ARTICLE IV ADDITIONAL AGREEMENTS SECTION 4.01. Registration Rights. (a) If the Company is a Public Company, upon the written request of Oxy Partners or any Permitted Transferee of Oxy Partners requesting that the Company effect the registration under the Securities Act of all or part of the Oxy Shares held by such Person and specifying the intended method of disposition thereof, the Company shall promptly give written notice of such requested registration to all other holders of Shares, and thereupon will, as expeditiously as possible, use its commercially reasonable efforts to effect the registration under the Securities Act of the Oxy Shares that the Company has been so requested to register by such holder, provided that (i) the Company shall be obligated to register Oxy Shares pursuant to this Section 4.01(a) on only one occasion, (ii) the Company shall not be 13 obligated to file a registration statement relating to any registration request under this Section 4.01(a) if with respect thereto the managing underwriter, the SEC, the Securities Act or the rules and regulations thereunder, or the form on which the registration statement is to be filed, would require the conduct of an audit other than the regular audit conducted by the Company at the end of its fiscal year, in which case the filing may be delayed until the completion of such regular audit (unless the holders of the Oxy Shares to be registered agree to pay the expenses of the Company in connection with such an audit other than the regular audit); provided, however, that the work required to be performed to enable the Company's auditors to issue their consent or a "cold comfort" letter shall not be deemed to be an audit, and (iii) if the Company, in its sole discretion, determines that the filing of a registration statement in the near future pursuant to this Section 4.01 would interfere with any financing, acquisition, corporate reorganization or other similar transaction involving the Company or any Subsidiary of the Company or that such registration would require disclosure of non-public information that the Company deems advisable not to disclose, then the Company's obligation to file a registration statement shall be deferred for a period not to exceed 180 days. (b) If any registration requested pursuant to this Section 4.01 that is proposed by the Company to be effected by the filing of a registration statement on Form S-3 (or any successor or similar short-form registration statement) shall be in connection with an underwritten public offering, and if the managing underwriter shall advise the Company in writing that, in its opinion, the use of another form of registration statement is of material importance to the success of such proposed offering, then such registration shall be effected on such other form. (c) A registration requested pursuant to this Section 4.01 shall not be deemed to have been effected unless it has become effective and, even in that event, such registration shall not be deemed to have been effected if within 180 days after it has become effective, the offering of Oxy Shares pursuant to such registration is interfered with by any stop order, injunction or other order or requirement of the SEC or other governmental agency or court (unless such stop order, injunction or other order or requirement arises out of or in connection with an action or failure to act or misstatement or omission by the Person requesting such registration). (d) If a requested registration pursuant to this Section 4.01 involves an underwritten offering, Oxy Partners shall have the right to select the lead underwriter or underwriters and managers to administer the offering, which shall be nationally recognized investment banking firms reasonably satisfactory to the Company, and the Company shall have the right to select a co-manager for the offering. (e) If a requested registration pursuant to this Section 4.01 involves an underwritten offering and the managing underwriter advises the Company in writing that, in its opinion, the number of securities requested to be included in such registration (including securities issued or to be issued by the Company that are not Oxy Shares) should be limited because the inclusion of 14 all of such securities is likely to adversely impact the purchase price obtained for such securities, the Company shall include in such registration securities in the following order of priority: first, Oxy Shares requested to be included in such registration pursuant to this Section 4.01 and second, any other securities of the Company. (f) For purposes of this Agreement, the Company shall be deemed to be a "Public Company" if, as of any date of determination, any Shares shall have been sold in a Public Offering and any Shares are registered under the Exchange Act. SECTION 4.02. Incidental Registration. If the Company at any time proposes to register any Shares under the Securities Act for Sale in a Public Offering, whether or not for its own account, on a form and in a manner that would permit registration of Oxy Shares under the Securities Act for Sale in such Public Offering, the Company shall give prompt written notice to all holders of Oxy Shares of its intention to do so, specifying the form and manner and the other relevant facts involved in such proposed registration (including, without limitations the identity of the managing underwriter). Upon the written request of any holder of Oxy Shares delivered to the Company within ten days after such notice shall have been given to such holder (which request shall specify the number of Oxy Shares intended to be disposed of by such holder and the intended method of disposition thereof), the Company shall use its commercially reasonable efforts to effect the registration under the Securities Act, as expeditiously as is reasonable, of all Oxy Shares that the Company has been so requested to register by the holders of Oxy Shares, to the extent requisite to permit the Sale of the Oxy Shares to be so registered in such Public Offering; provided, however, that: (a) if, at any time after giving such written notice of its intention to register any of such Shares proposed to be registered by the Company and prior to the effective date of the registration statement filed in connection with such registration, the Company shall determine for any reason not to register such Shares, the Company may, at its election, give written notice of such determination to each holder of Oxy Shares that has requested to register Oxy Shares and thereupon the Company shall be relieved of its obligation to register any Oxy Shares in connection with such registration; (b) if the managing underwriter of such Public Offering shall advise the Company that, in its judgment, the number of Shares proposed to be included in such Public Offering should be limited because the inclusion of Oxy Shares is likely to adversely impact the purchase price obtained for the Shares initially proposed to be included in such Public Offering by the Company (whether or not for its own account), then the Company shall promptly advise each holder of such Oxy Shares thereof and may require, by written notice to each such holder accompanying such advice, that, to the extent necessary to meet such limitation, the number of Oxy Shares to be included in such registration shall be reduced, and all holders of Oxy Shares proposing to sell Shares in such Public Offering shall share pro rata in the number of Shares to be 15 excluded from such offering, such sharing to be based on the respective numbers of Shares as to which they have requested registration; and (c) the Company shall not be obligated to effect any registration of Oxy Shares under this Section 4.02 that is incidental to the registration of any of its Shares or other securities in connection with any merger, acquisition, exchange offer, dividend reinvestment plan or stock option, stock purchase, savings or other employee benefit plan. SECTION 4.03. Registration Procedures. (a) If and whenever the Company is required to use its commercially reasonable efforts to effect the registration of any Oxy Shares as provided in Section 4.01 or 4.02, the Company will as expeditiously as is reasonably practicable: (i) prepare and file with the SEC on any appropriate form a registration statement with respect to such Oxy Shares and use its commercially reasonable efforts to cause such registration statement to become effective; (ii) prepare and file with the SEC such amendments (including post- effective amendments) and supplements to such registration statement and the prospectus used in connection therewith as may be necessary to keep such registration statement effective and to comply with the provisions of the Securities Act and the rules and regulations thereunder with respect to the disposition of all Oxy Shares and other securities covered by such registration statement until the earlier of (A) such time as all such Oxy Shares and other securities have been disposed of in accordance with the intended methods of disposition by the seller or sellers thereof set forth in such registration statement and (B) the expiration of 180 days from the date such registration statement first becomes effective (or such other period as may be agreed upon by the Company and the managing underwriter); (iii) furnish to each seller of such Oxy Shares such number of conformed copies of such registration statement and of each such amendment and supplement thereto (in each case including all exhibits), such number of copies of the prospectus included in such registration statement (including each preliminary prospectus and any summary prospectus), in conformity with the requirements of the Securities Act and the rules and regulations thereunder, such documents incorporated by reference in such registration statement or prospectus, and such other documents, as such seller may reasonably request in order to facilitate the sale or disposition of such Oxy Shares; (iv) use its commercially reasonable efforts to register or qualify all Oxy Shares covered by such registration statement under such other securities or "blue sky" laws of such U.S. jurisdictions as each seller shall reasonably request, and do any and all other acts and things that may be necessary to enable such seller to consummate the disposition in such jurisdictions of its Oxy Shares covered by such registration statement, except that the Company shall not for any 16 such purpose be required to qualify generally to do business as a foreign corporation in any jurisdiction wherein it is not so qualified, or to subject itself to taxation in respect of doing business in any such jurisdiction, or to consent to general service of process in any such jurisdiction; (v) enter into such customary agreements (including an underwriting agreement in customary form), which may include indemnification provisions in favor of underwriters and other persons in addition to, or in substitution for the provisions of Section 4.06, and take such other actions as sellers of a majority of Oxy Shares or the underwriters, if any, reasonably request in order to expedite or facilitate the disposition of such Oxy Shares; (vi) furnish to each seller of Oxy Shares (x) a signed counterpart, addressed to such seller, of any opinion of counsel for the Company, dated the date of the closing under the underwriting agreement with respect to such Public Offering, and (y) a signed counterpart, if requested by such seller, managing underwriter or other seller of securities included in such registration, addressed to such seller, of any "cold comfort" letter signed by the independent public accountants in customary form and covering matters of the type customarily covered by "cold comfort" letters as the managing underwriter or seller of such Oxy Shares shall reasonably request (provided that Oxy Shares constitute at least 25% of the securities covered by such registration statement, unless such a "cold comfort" letter or letters are provided to the Company, managing underwriter or other selling holders in connection with such registration); (vii) immediately notify each seller of Oxy Shares covered by such registration statement at any time when a prospectus relating thereto is required to be delivered under the Securities Act and the rules and regulations thereunder, of the happening of any event as a result of which the prospectus included in such registration statement, as then in effect, includes an untrue statement of a material fact or omits to state any material fact required to be stated therein or necessary to make the statements therein not misleading in the light of the circumstances then existing or if it is necessary to amend or supplement such prospectus to comply with law, and at the request of any such seller prepare and furnish to such seller a reasonable number of copies of a supplement to or an amendment of such prospectus as may be necessary so that, as thereafter delivered to the purchasers of such Oxy Shares or other securities, such prospectus shall not include an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading in the light of the circumstances then existing and shall otherwise comply in all material respects with law and so that such prospectus, as amended or supplemented, will comply with law; (viii) otherwise use its commercially reasonable efforts to comply with all applicable rules and regulations of the SEC, and make available to its security holders, as soon as reasonably practicable, an earnings statement which shall satisfy the provisions of Section 11(a) of the Securities Act and the rules and regulations thereunder; 17 (ix) use its commercially reasonable efforts to list such Oxy Shares on each securities exchange or quotation system on which Shares are then listed or quoted, if such Oxy Shares are not already so listed or quoted and if such listing is then permitted under the rules of such exchange or quotation system, and provide a transfer agent and registrar for such Oxy Shares not later than the effective date of such registration statement; (x) cooperate with the holders of Oxy Shares covered by the registration statement and the managing underwriter or agent, if any, to facilitate the timely preparation and delivery of certificates (not bearing any restrictive legends) representing securities to be sold under the registration statement, and enable such securities to be in such denominations and registered in such names as the managing underwriter or agent, if any, or such holders may request; (xi) notify counsel for the holders of Oxy Shares included in such registration statement and the managing underwriter or agent, immediately (i) when the registration statement, or any post-effective amendment to the registration statement, shall have become effective, or any supplement to the prospectus or any amendment prospectus shall have been filed, (ii) of the receipt of any comments from the SEC, (iii) of any request of the SEC to amend the registration statement or amend or supplement the prospectus or for additional information, and (iv) of the issuance by the SEC of any stop order suspending the effectiveness of the registration statement or of any order preventing or suspending the use of any preliminary prospectus, or of the suspension of the qualification of the registration statement for offering or sale in any jurisdiction, or of the institution or threatening of any proceedings for any of such purposes; (xii) make every commercially reasonable effort to prevent the issuance of any stop order suspending the effectiveness of the registration statement or of any order preventing or suspending the use of any preliminary prospectus and, if any such order is issued, to obtain the withdrawal of any such order at the earliest possible moment; (xiii) if requested by the managing underwriter or agent or any holder of Oxy Shares covered by the registration statement, promptly incorporate in a prospectus supplement or post-effective amendment such information as the managing underwriter or agent or such holder reasonably requests to be included therein, including, without limitation, with respect to the number of Oxy Shares being sold by such holder to such underwriter or agent, the purchase price being paid therefor by such underwriter or agent and with respect to any other terms of the underwritten offering of the Oxy Shares to be sold in such offering; and make all required filings of such prospectus supplement or post-effective amendment as soon as practicable after being notified of the matters incorporated in such prospectus supplement or posteffective amendment; (xiv) cooperate with each seller of Oxy Shares and each underwriter or agent participating in the disposition of such Oxy Shares and their respective counsel in connection 18 with any filings required to be made with the National Association of Securities Dealers, Inc.; and (xv) issue to any underwriter to which any holder of Oxy Shares may sell such Oxy Shares in connection with any such registration (and to any direct or indirect transferee of any such underwriter) certificates evidencing Oxy Shares without the legends described in Section 3.02(a). The Company may require each seller of Oxy Shares as to which any registration is being effected to furnish the Company with such information regarding such seller and the distribution of such Oxy Shares as the Company may from time to time reasonably request in writing in connection therewith. (b) Each holder of Oxy Shares agrees, if so required by the managing underwriters, not to effect any public sale or distribution (including any sale pursuant to Rule 144) of Shares (other than as part of such Public Offering) within 7 days prior to the anticipated effective date of the registration statement with respect to such underwritten public offering or 180 days after the effective date of such registration statement. (c) The Company agrees, if so required by the managing underwriters in connection with such Public Offering of Oxy Shares pursuant to Section 4.01 or Section 4.02, not to effect any public sale or distribution of any of its equity securities or securities convertible into or exchangeable or exercisable for any of such equity securities within the seven days prior to the anticipated effective date of the registration statement with respect to such Public Offering or 180 days after the effective date of such registration statement, except as part of such Public Offering or except in connection with a dividend reinvestment plan, a stock option, stock purchase, savings or other employee benefit plan, or an acquisition, merger or exchange offer. SECTION 4.04. Preparation, Reasonable Investigation. In connection with the preparation and filing of a registration statement pursuant to Section 4.01 or Section 4.02, the Company will give the holders of Oxy Shares on whose behalf such Oxy Shares are to be so registered and their underwriters, if any, and their respective counsel, accountants and other agents the opportunity to participate in the preparation of such registration statement, each prospectus included therein or filed with the SEC, and each amendment thereof or supplement thereto, and will give each of them such access to its books and records and such opportunities to discuss the business of the Company with its officers and the independent public accountants who have issued a report on its financial statements as shall be necessary, in the opinion of such holders and such underwriters or their respective counsel, to conduct a reasonable investigation within the meaning of the Securities Act. 19 SECTION 4.05. Indemnification. (a) In the event of any registration of Oxy Shares pursuant to Section 4.01 or Section 4.02, the Company shall indemnify and hold harmless the seller of any Oxy Shares covered by such registration statement, its directors and officers, general and limited partners (and directors and officers thereof and, if such seller is a portfolio or investment fund, its investment advisors), each other Person who participates as an underwriter in the Public Offering of such Oxy Shares, each officer and director of each such underwriter, and each other Person, if any, who controls such seller or any such underwriter within the meaning of Section 15 of the Securities Act, against any losses, claims, damages, liabilities and expenses (including, without limitation, reasonable attorneys' fees and any and all reasonable expenses incurred in investigating, preparing or defending against any litigation, commenced or threatened, or any claim, and any and all amounts paid in settlement of any such claim or litigation) to which such seller or any such director or officer or participating or controlling Person may become subject under the Securities Act, the Exchange Act, the rules and regulations thereunder or otherwise, insofar as such losses, claims, damages, liabilities or expenses (or actions or proceedings in respect thereof) arise out of or are based upon (i) any untrue statement or alleged untrue statement of any material fact contained in the registration statement under which such Oxy Shares were registered under the Securities Act, any preliminary prospectus, final prospectus or summary prospectus included therein, or any amendment or supplement thereto, or any document incorporated by reference therein, (ii) any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, or (iii) any failure by the Company to comply with the requirements of the Securities Act, the Exchange Act, any state securities laws or any rule or regulation promulgated under any of the foregoing, and the Company will reimburse such seller, and each such director, officer, underwriter and controlling Person for any legal or any other expenses reasonably incurred by them in connection with investigating or defending any such loss, claim, liability, action or proceeding; provided, however, that the Company shall not be liable in any such case to the extent that any such loss, claim, damage, liability (or action or proceeding in respect thereof) or expense arises out of or is based upon (i) an untrue statement or alleged untrue statement or omission or alleged omission made in such registration statement, any such preliminary prospectus, final prospectus, summary prospectus, amendment or supplement in reliance upon and in conformity with written information furnished to the Company for use in the preparation thereof by such seller or underwriter, as the case may be, or (ii) an untrue statement or alleged untrue statement or omission or alleged omission made in any preliminary prospectus but notified to such seller and underwriter prior to any sale of Oxy Shares and subsequently corrected by the Company in any final prospectus, amendment or supplement made available to such seller or underwriter but which final prospectus, amendment or supplement was not used by such seller or underwriter in the sale of Oxy Shares that gave rise to such loss, claim, damage, liability (or action or proceeding in respect thereof) or expense. Such indemnity shall remain in full force and effect regardless of any investigation made by or on behalf of such seller or any such director, officer, underwriter or controlling Person and shall survive the transfer of such Oxy Shares by such seller. 20 (b) The Company may require, as a condition to including any Oxy Shares in any registration statement filed pursuant to Section 4.01 or Section 4.02, that the Company shall have received an undertaking satisfactory to it from (i) the prospective seller of such Oxy Shares, to indemnify and hold harmless the Company, each underwriter of such Shares, each officer and director of each such underwriter and each other Person, if any, who controls the Company or any such underwriter within the meaning of Section 15 of the Securities Act, and (ii) each underwriter of such Oxy Shares, to indemnify and hold harmless the Company, each officer and director of the Company, each prospective seller, each officer and director of each prospective seller and each other Person, if any, who controls the Company or any such prospective seller within the meaning of Section 15 of the Securities Act, against any losses, claims, damages, liabilities and expenses (including, without limitation, reasonable attorneys' fees and any and all reasonable expenses incurred in investigating, preparing or defending against any litigation, commenced or threatened, or any claim, and any and all amounts paid in settlement of any such claim or litigation) to which such Person or any such director or officer or participating or controlling Person may become subject under the Securities Act, the Exchange Act, the rules and regulations thereunder or otherwise, insofar as such losses, claims, damages, liabilities or expenses (or actions or proceedings in respect thereof) arise out of or are based upon (i) any untrue statement or alleged untrue statement of any material fact contained in the registration statement under which such Oxy Shares were registered under the Securities Act, any preliminary prospectus, final prospectus or summary prospectus included therein, or any amendment or supplement thereto, or any document incorporated by reference therein, in reliance upon and in conformity with written information furnished to the Company for use in the preparation thereof by the party from whom indemnification is sought hereunder, (ii) any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading in reliance upon and in conformity with written information furnished to the Company for use in the preparation thereof by the party from whom indemnification is sought hereunder, or (iii) any failure by the party from whom indemnification is sought to comply with the requirements of the Securities Act, the Exchange Act, any state securities laws or any rule or regulation promulgated under any of the foregoing and the indemnifying party will reimburse each indemnified party, and each such director, officer, underwriter and controlling Person for any legal or any other expenses reasonably incurred by them in connection with investigating or defending any such loss, claim, liability, action or proceeding. Such indemnity shall remain in full force and effect regardless of any investigation made by or on behalf of the Company or any such director, officer or controlling Person and shall survive the transfer of such Oxy Shares by such seller. (c) Promptly after receipt by an indemnified party of notice of the commencement of any action or proceeding (including any governmental investigation) involving a claim referred to in Section 4.05(a) or (b), such indemnified party will, if a claim in respect thereof is to be made against an indemnifying party, give written notice to the latter of the commencement of such action; provided, however, that the failure of any indemnified party to give notice as 21 provided herein shall not relieve the indemnifying party of its obligations under the preceding provisions of this Section 4.05, except to the extent that the indemnifying party is actually prejudiced by such failure to give notice. In case any such action is brought against an indemnified party, unless in such indemnified party's reasonable judgment a conflict of interest between such indemnified and indemnifying parties may exist in respect of such claim (in which case, the indemnifying party shall not be liable for the fees and expenses of more than one counsel for all sellers of Oxy Shares and more than one counsel for the underwriters in connection with any one action or separate but similar or related actions), the indemnifying party will be entitled to participate in and to assume the defense thereof, jointly with any other indemnifying party similarly notified, to the extent that it may wish with counsel reasonably satisfactory to such indemnified party, and after notice from the indemnifying party to such indemnified party of its election so to assume the defense thereof, the indemnifying party will not be liable to such indemnified party for any legal or other expenses subsequently incurred by the latter in connection with the defense thereof. No indemnifying party will consent to entry of any judgment or enter into any settlement which does not include as an unconditional term thereof, the giving by the claimant or plaintiff to such indemnified party of a release, in form and substance reasonably satisfactory to such indemnified party, from all liability in respect to such claim or litigation. No indemnified party will consent to the entry of any judgment or enter into any settlement with respect to such claim or litigation without the written consent of the indemnifying party. SECTION 4.06. Contribution. (a) If the indemnification provided for in Section 4.05 is unavailable to the indemnified parties in respect of any losses, claims, damages or liabilities referred to therein, then each indemnifying party and the Company shall contribute to the amounts paid or payable by such indemnified parties as a result of such losses, claims, damages or liabilities (i) as between the Company and the holders of Oxy Shares covered by a registration statement, on the one hand, and the underwriters, on the other, in such proportion as is appropriate to reflect the relative benefits received by the Company and such holders, on the one hand, and the underwriters, on the other, from the Public Offering of the Oxy Shares, or if such allocation is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits but also the relative fault of the Company and such holders, on the one hand, and of the underwriters, on the other, in connection with the statements or omissions that resulted in such losses, claims, damages or liabilities, as well as any other relevant equitable considerations, and (ii) as between the Company, on the one hand, and each holder of Oxy Shares covered by a registration statement, on the other, in such proportion as is appropriate to reflect the relative fault of the Company and of each such holder in connection with such statements or omissions, as well as any other relevant equitable considerations. The relative benefits received by the Company and such holders, on the one hand, and the underwriters, on the other, shall be deemed to be in the same proportion as the total proceeds from the Public Offering (net of underwriting discounts and commissions but before deducting expenses) received by the Company and such holders bear to the total underwriting discounts and 22 commissions received by the underwriters. The relative fault of the Company and such holders, on the one hand, and of the underwriters, on the other, shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the Company and such holders or by the underwriters. The relative fault of the Company, on the one hand, and of each such holder, on the other, shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact relates to information supplied by such party, and the parties' relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission. (b) The Company and the holders of Oxy Shares agree that it would not be just and equitable if contribution pursuant to this Section 4.06 were determined by pro rata allocation (even if the underwriters were treated as one entity for such purpose) or by any other method of allocation that does not take account of the equitable considerations referred to in the next preceding paragraph. The amount paid or payable by an indemnified party as a result of the losses, claims, damages or liabilities referred to in the next preceding paragraph shall be deemed to include, subject to the limitations set forth above, any legal or other expenses reasonably incurred by such indemnified party in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this Section 4.06, no underwriter shall be required to contribute any amount in excess of the amount by which the total price at which the Oxy Shares underwritten by it and distributed to the public were offered to the public pursuant to such Public Offering exceeds the amount of any damages that such underwriter has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission, and no holder of Oxy Shares shall be required to contribute any amount in excess of the amount by which the total price at which the Oxy Shares of such holder were offered to the public pursuant to such Public Offering exceeds the amount of any damages that such holder has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. Each holder's obligation to contribute pursuant to this Section 4.06 is several in the proportion that the proceeds of the Public Offering received by such holder bears to the total proceeds of the Public Offering received by all the holders of Oxy Shares and not joint. SECTION 4.07. Certain Information. In the event that and so long as the Company shall be a Public Company, it shall file all reports and other information required to be filed by Section 13 or 15(d) under the Exchange Act, as the case may be, within the respective time periods prescribed thereby for the filing of such reports and other information, as shall be necessary in order that the conditions to the availability of Rule 144 in connection with any Sale of Oxy Shares by a Stockholder shall be met. 23 ARTICLE V REPRESENTATIONS AND WARRANTIES OF THE PARTIES SECTION 5.01. Representations and Warranties of Each Party. Each Party hereby makes the following representations and warranties to the other Parties: (a) Organization and Qualification. Such entity is a corporation or a general partnership duly organized, validly existing and in good standing under the laws of its jurisdiction of organization. (b) Authority. Such entity has all requisite corporate or partnership power and authority to execute and deliver this Agreement, to perform its obligations hereunder and to consummate the transactions contemplated hereby. The execution and delivery of this Agreement by such entity and the consummation by it of the transactions contemplated hereby have been duly and validly authorized by all necessary corporate or partnership action and no other proceedings on the part of such entity are necessary to authorize this Agreement or to consummate the transactions contemplated hereby. This Agreement has been duly and validly executed and delivered by such entity and, assuming the due authorization, execution and delivery by the other parties thereto, constitutes a legal, valid and binding obligation of such entity, enforceable against such entity in accordance with its terms. (c) No Conflict; Required Filings and Consents. (i) The execution of and delivery of this Agreement by such entity do not, and the performance this Agreement by such entity will not, (A) conflict with or violate the Certificate of Incorporation, By-Laws or similar organizational documents of such entity, (B) conflict with or violate any Laws applicable to such entity or by which any of its properties or assets is bound or (C) result in any breach of or constitute a default (or an event that with notice or lapse of time or both would become a default) under, or give to others any rights of termination, amendment, acceleration or cancellation of, or result in the creation of an Encumbrance on any of the properties or assets of such entity pursuant to, any note, bond, mortgage, indenture, contract, agreement, lease, license, permit, franchise or other instrument or obligation to which such entity is a party or by which such entity or any of its properties is bound, except in any case for such conflicts, violations, breaches, defaults or other effects which would not prevent or materially delay the performance by such entity of its obligations hereunder. (ii) The execution and delivery of this Agreement by such entity do not, and the performance of this Agreement by such entity will not, require any consent, approval, authorization or permit of, or filing with or notification to, any Governmental Entity. 24 ARTICLE VI MISCELLANEOUS SECTION 6.01. Notices. All notices, requests, claims, demands and other communications hereunder shall be in writing and shall be given (and shall be deemed to have been duly given upon receipt) by delivery in person, by telecopy or by registered or certified mail (postage prepaid, return receipt requested) to the respective parties at the following addresses (or at such other address for a party as shall be specified in a notice given in accordance with this Section 6.01): (a) If to the Company: Clark USA, Inc. 8182 Maryland Avenue St. Louis, Missouri 63105-3721 Telecopier No.: (314) 854-1599 Attention: Maura Clark, Executive Vice President, Corporate Development and Chief Financial Officer With copies to: Mayer, Brown & Platt 190 South LaSalle Street Chicago, Illinois 60603-3441 Telecopier No.: (312) 701-7711 Attention: Richard S. Millard, Esq. (b) If to Oxy Partners: c/o Occidental Petroleum Corporation 10889 Wilshire Blvd. Los Angeles, California 90024 Telecopier No.: (310) 443-6812 Attention: Stephen I. Chazen Executive Vice President, Corporate Development With a copy to: Occidental Petroleum Corporation 25 10889 Wilshire Blvd. Los Angeles, California 90024 Telecopier No.: (310) 443-6333 Attention: General Counsel SECTION 6.02. Public Announcements. The Parties shall consult with each other before issuing any press release or otherwise making any public statements with respect to this Agreement and, except as may be required by Law or any listing agreement with any securities exchange, shall not issue any such press release or make any such public statement without the consent of the other parties. SECTION 6.03. Headings. The descriptive headings contained in this Agreement are for reference purposes only and shall not affect in any way the meaning or interpretation of this Agreement. SECTION 6.04. Severability. If any term or other provision of this Agreement is invalid, illegal or incapable of being enforced by any rule of Law or public policy, all other conditions and provisions of this Agreement shall nevertheless remain in full force and effect so long as the economic or legal substance of the transactions contemplated hereby is not affected in any manner materially adverse to any Party. Upon such determination that any term or other provision is invalid, illegal or incapable of being enforced, the Parties shall negotiate in good faith to modify this Agreement so as to effect the original intent of the Parties as closely as possible in an acceptable manner to the end that the transactions contemplated hereby are fulfilled to the extent possible. SECTION 6.05. Entire Agreement. This Agreement constitutes the entire agreement among the Parties and supersedes all prior agreements and undertakings, both written and oral, among the Parties, or any of them, with respect to the subject matter hereof. SECTION 6.06. Assignment. Except as otherwise provided herein, this Agreement shall be binding upon and shall inure to the benefit of the Parties and their respective successors and permitted assigns; provided, however, that this Agreement shall not inure to the benefit of any Prospective Transferee unless such Prospective Transferee shall have complied with the terms of Section 3.05. No Stockholder may assign any of its rights hereunder to any Person other than a transferee that has complied with the requirements of Section 3.05 in all respects. SECTION 6.07. Parties in Interest. Nothing in this Agreement, express or implied, is intended to or shall confer upon any Person other than the Parties and their respective successors and assigns any right, benefit or remedy of any nature whatsoever under or by reason of this Agreement. 26 SECTION 6.08. Amendment. (a) Any term of this Agreement may be amended and the observance of any such term may be waived (either generally or in a particular instance and either retroactively or prospectively) only with the written consent of the Company and Oxy Partners. (b) No failure or delay by any party in exercising any right, power or privilege under this Agreement shall operate as a waiver thereof nor shall any single or partial exercise thereof preclude any other or further exercise thereof or the exercise of any other right, power or privilege. The rights and remedies herein provided shall be cumulative and not exclusive of any rights or remedies provided by law. SECTION 6.09. Governing Law. This Agreement shall be governed by, and construed in accordance with, the laws of the State of New York applicable to contracts executed in and to be performed entirely within that State. All actions and proceedings arising out of or relating to this Agreement shall be heard and determined in a New York state or federal court sitting in the City of New York, and the Parties hereby irrevocably submit to the exclusive jurisdiction of such courts in any such action or proceeding and irrevocably waive the defense of an inconvenient forum to the maintenance of any such action or proceeding. SECTION 6.10. Counterparts. This Agreement may be executed (by original or telecopied signature) in one or more counterparts, and by the different Parties in separate counterparts, each of which when so executed shall be deemed to be an original but all of which taken together shall constitute one and the same agreement. SECTION 6.11. Specific Performance. The Parties agree that irreparable damage would occur in the event any provision of this Agreement was not performed in accordance with the terms hereof and that the parties shall be entitled to specific performance of the terms hereof, in addition to any other remedy at law or in equity. SECTION 6.12. Termination. This Agreement shall terminate on the tenth anniversary of the date hereof. After the eighth anniversary hereof the Parties shall use their commercially reasonable efforts to extend the terms of this Agreement for an additional ten year period. IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed as of the date first written above by their respective officers thereunto duly authorized. CLARK USA, INC. By: _________________________ Name: Title: OCCIDENTAL C.O.B. PARTNERS By OXY USA, Inc., its managing partner By: _________________________ Name: Title: The undersigned hereby agrees to be bound by the provisions of Article II hereof. BCP/CLARK HOLDINGS CORPORATION By: _________________________ Name: Title:
          WARRANT EXERCISE AND SHARE EXCHANGE AGREEMENT, dated as of April __,
2002 (this "Agreement"), by and among Occidental Petroleum Corporation, a
Delaware Corporation, ("Oxy Corp.") Occidental C.O.B. Partners, a Delaware
general partnership ("Oxy Partnership" (together with Oxy Corp., "Oxy"),
Blackstone Capital Partners III Merchant Banking Fund L.P., a Delaware limited
partnership ("BCP III"), Blackstone Offshore Capital Partners III L.P., a
Delaware limited partnership ("BOCP III"), Blackstone Family Investment
Partnership III L.P., a Delaware limited partnership ("BFIP III"; together with
BCP III and BOCP III, "Blackstone"), Premcor Inc., a Delaware corporation
("Premcor"), and Sabine River Holding Corp., a Delaware corporation ("Sabine").


                                   WITNESSETH:
                                   -----------


          WHEREAS, Premcor's authorized capital stock includes 7,000,000 shares
of Class F Common Stock of Premcor, par value $0.01 per share (the "Premcor
Class F Common Stock"), of which 6,101,010 such shares are currently held by Oxy
Partnership (the "Existing Oxy F Shares");

          WHEREAS, (a) Oxy Corp. is also the holder of a warrant, dated as of
August 4, 1999 (the "Oxy Warrant"), to purchase 30,000 shares of common stock of
Sabine, par value $0.01 per share ("Oxy Warrant Shares"), at a per share price
equal to $0.09, (b) upon the exercise of the Oxy Warrant, Oxy has the option to
exchange all of such Oxy Warrant Shares for a total of 270,000 shares of Premcor
Class F Common Stock ("Oxy Exchange F Shares") pursuant to the Share Exchange
Agreement, dated as of August 4, 1999 (the "Share Exchange Agreement"), among
Oxy Corp, Sabine and Premcor and (c) Oxy Corp. owns 681,818 shares ("Oxy Sabine
Shares") of common stock of Sabine, par value $0.01 per share;

          WHEREAS, each of BCP III, BOCP III and BFIP III holds warrants, dated
as of August 4, 1999 (collectively, the "Blackstone Warrants"), to purchase an
aggregate of 2,430,000 shares (the "Blackstone Warrant Shares") of common stock
of Premcor, par value $0.01 per share ("Premcor Common Stock"), at a per share
price equal to $0.01;

          WHEREAS, Premcor is willing to issue to Oxy 1,363,636 shares of
Premcor's Common Stock, par value $0.01 per share in exchange for the Oxy Sabine
Shares, and Oxy is willing to surrender the Oxy Sabine Shares in exchange for
such shares of Premcor Common Stock;

          WHEREAS, Premcor is willing to issue to Oxy 270,000 of the Oxy
Exchange F Shares in exchange for the Oxy Warrant Shares; such shares to be then
exchanged for 270,000 shares of Premcor Common Stock;

          WHEREAS, for United States federal income tax purposes, the parties
intend (a) that the exchange by Oxy of the Oxy Sabine Shares and the Oxy Warrant
Shares for Premcor Class F Common Stock or Premcor Common Stock, as the case may
be, will qualify as a reorganization under the provisions of Section 368(a) of
the Internal Revenue Code of 1986, as


                                                                               2


amended (the "Code"), and (b) by executing this Agreement, to adopt a plan of
reorganization within the meaning of Section 368 of the Code and the treasury
regulations promulgated thereunder; and

          WHEREAS, in connection with a proposed initial public offering of
Premcor Common Stock (the "IPO"), the parties hereto have determined that it is
in their respective best interests for Premcor to have only one class of common
stock and for Oxy's direct share ownership in Sabine to be converted to Premcor
Common Stock and for such outcome to be effected by the following actions: (a)
Oxy to exchange the Existing Oxy F Shares for shares of Premcor Common Stock,
(b) Oxy to exercise the Oxy Warrant and to exchange the Oxy Warrant Shares for
the Oxy Exchange F Shares, (c) Oxy to exchange the Oxy Exchange F Shares for
shares of Premcor Common Stock (d) Blackstone to exercise the Blackstone
Warrants for shares of Premcor Common Stock, and (e) after the IPO, and at such
time as the restrictions to such ownership are removed, either through the
successful solicitation of the holders of the 12.50% Senior Secured Notes due
2009 of Port Arthur Finance Corp., an indirect subsidiary of Sabine, and the
completion of certain other conditions precedent or another restructuring that
would eliminate such ownership restrictions (the "PACC Restructuring"), Oxy to
exchange the Oxy Sabine Shares for the Premcor Common Stock.

          WHEREAS, the board of directors of Premcor has determined that it is
in the best interests of the stockholders of Premcor to enter into this
Agreement, and has approved on September 26, 2001 an agreement in a form
substantially similar to this Agreement.

          NOW, THEREFORE, in consideration of the premises and of the mutual
agreements herein contained, the parties hereto agree as follows:

          1.   Exercise of Oxy Warrant and Exchange of Oxy Warrant Shares.
Notwithstanding the terms and conditions of the Oxy Warrant and the Share
Exchange Agreement, Oxy and Sabine hereby agree that Oxy will exercise the Oxy
Warrant for 30,000 Oxy Warrant Shares pursuant to the terms and conditions of
the Oxy Warrant and surrender such 30,000 Oxy Warrant Shares to Premcor, whereby
Premcor shall (A) issue to Oxy 270,000 shares of Premcor Class F Common Stock in
exchange for the 30,000 Oxy Warrant Shares and (B) issue to Oxy 270,000 shares
of Premcor Common Stock in exchange for the 270,000 shares of Premcor Class F
Common Stock. Such shares will be registered in the same names as set forth in
Section 2 below. Such exercise and exchange shall occur immediately at the
written request of either Premcor or Oxy to the other party on the effective
date of the registration statement filed by Premcor in connection with the
proposed IPO.

          2.   Exchange of Oxy's Existing F Shares.  On the effective date of
the registration statement filed by Premcor in connection with the proposed IPO,
Oxy shall surrender all of the 6,101,010 Existing Oxy F Shares, in exchange for
6,101,010 shares of Premcor Common Stock to be registered in the same names as
the surrendered shares are registered (with any legends required by Section 3.02
of the Second Amended and Restated Stockholders' Agreement, dated as of November
3, 1997 (as modified, supplemented and amended from time to time, the
"Stockholders' Agreement"), between Clark USA, Inc. and Occidental C.O.B.
Partners).


                                                                               3


          3.   Exercise of the Blackstone Warrants. Notwithstanding the terms
and conditions of the Blackstone Warrants to the contrary, Blackstone and
Premcor hereby agree that Blackstone will exercise all of the Blackstone
Warrants for 2,430,000 Blackstone Warrant Shares pursuant to the terms and
conditions of the Blackstone Warrants. Such exercise shall occur immediately at
the written request of either Premcor or Blackstone to the other party on the
effective date of the registration statement filed by Premcor in connection with
the proposed IPO.

          4.   PACC Restructuring Exchange. Subsequent to the proposed IPO, but
immediately prior to the PACC Restructuring, Oxy will surrender to Premcor its
681,818 Oxy Sabine Shares in exchange for 1,363,636 shares of Premcor Common
Stock. Premcor will issue to Oxy the 1,363,636 shares of Premcor Common Stock in
exchange for the 681,818 Oxy Sabine Shares.

          5.   Termination of the Share Exchange Agreement.  Upon exercise of
the Oxy Warrant and exchange of the Oxy Warrant Shares as set forth in Section
1, the Share Exchange Agreement shall automatically terminate and thereafter be
of no further force or effect.

          6.   Adoption of the Stockholders' Agreement. From and after the
earliest Exchange Date, the parties hereto agree that the terms and conditions
of the Stockholders' Agreement shall apply to the all the shares of Premcor
Common Stock issued to Oxy pursuant to this Agreement.

          7.   Representations of Premcor. (a) Premcor represents and warrants
to Oxy that each of the shares of Oxy Warrant Shares, Premcor Class F Common
Stock and Premcor Common Stock, when issued in accordance with any Section of
this Agreement, shall be duly authorized, validly issued, fully paid,
nonassessable and free of preemptive rights.

          (b)  Premcor represents and warrants to Blackstone that the Blackstone
Warrant Shares shall be, upon exercise of the Blackstone Warrants, duly
authorized, validly issued, fully paid, nonassessable and free of preemptive
rights.

          8.   Covenants. (a) Each of the parties hereto covenants and agrees
that it shall not avoid or seek to avoid the observance or performance of any of
the terms of this Agreement, but will at all times in good faith assist in the
carrying out of all such terms and in the taking of all such action as may be
reasonably necessary or appropriate to protect the rights of the parties hereto
against impairment of their respective rights hereunder.

          (b)  Premcor shall at all times have authorized a sufficient number of
shares of Premcor Common Stock and Premcor Class F Common Stock so that Premcor
will be able to deliver the Premcor Common Stock and Premcor Class F Common
Stock, as the case may be, to Oxy and Blackstone in accordance with the terms of
this Agreement.

          (c)  Premcor covenants that any stock split, combination or
reclassification will result in appropriate adjustments, if needed, in the
number of shares of authorized Premcor Class F Common Stock.


                                                                               4


          (d)  Oxy covenants and agrees that, if there is a reasonable
likelihood that the PACC Restructuring will occur prior to the IPO, that it
shall in good faith promptly amend this agreement such that Premcor and Oxy can
accomplish the exchange pursuant to the PACC Restructuring at the ratio set
forth in Section 4 of this agreement; provided that no such exchange shall be
made until either (a) Oxy receives reasonable assurance that such exchange will
qualify as a reorganization under the provisions of Section 368(a) of the Code
or (b) Oxy receives reasonable indemnification from Premcor to compensate it for
any loss related to a failure of such exchange to qualify as a reorganization
under the provisions of Section 368(a) of the Code.

          9.   Term. Unless otherwise agreed to in writing by the parties
hereto, the term of this Agreement shall commence on the date hereof and end on
the date, if any, on which Premcor shall have advised Oxy and Blackstone that it
has abandoned its plans to consummate the IPO or the PACC Restructuring.

          10.  Successors. All the provisions of this Agreement by or for the
benefit of the parties hereto shall bind and inure to the benefit of their
respective successors and assigns.

          11.  No Assignment. No party hereto may assign its rights and
obligations hereunder without the prior consent of the other parties hereto.

          12.  Headings. The headings of sections of this Agreement have been
inserted for convenience of reference only, are not to be considered a part
hereof and shall in no way modify or restrict any of the terms or provisions
hereof.

          13.  Remedies; Amendment. The rights and remedies of the parties
hereto are cumulative and not exclusive of any rights or remedies which it would
otherwise have. This Agreement may only be amended or modified by a written
instrument signed by each of the parties hereto.

          14.  Severability. Whenever possible, each provision of this Agreement
will be interpreted in such manner as to be effective and valid under applicable
law, but if any provision of this Agreement is held to be invalid, illegal or
unenforceable in any respect under any applicable law or rule in any
jurisdiction, such invalidity, illegality or unenforceability will not affect
any other provision or any other jurisdiction, and such invalid, void or
otherwise unenforceable provisions shall be null and void. It is the intent of
the parties, however, that any invalid, void or otherwise unenforceable
provisions be automatically replaced by other provisions which are as similar as
possible in terms to such invalid, void or otherwise unenforceable provisions
but are valid and enforceable to the fullest extent permitted by law.

          15.  Governing Law. All questions concerning the construction,
interpretation and validity of this Agreement shall be governed by and construed
in accordance with the domestic laws of the State of New York.

          16.  Notices. All notices, demands and requests of any kind to be
delivered to any party hereto in connection with this Agreement shall be in
writing, (a) delivered personally, (b) sent by internationally-recognized
overnight courier, (c) sent by first class, registered or


                                                                               5

certified mail, return receipt requested or (d) by telecopy with confirmed
receipt (with hard copy to follow). Any notice, demand or request so delivered
shall constitute valid notice under this Agreement and shall be deemed to have
been received (i) on the day of actual delivery in the case of personal
delivery, (ii) on the next Business Day after the date when sent, in the case of
delivery by internationally-recognized overnight courier, (iii) on the fifth
Business Day after the date of deposit in the U.S. mail in the case of mailing
or (iv) one business day after being sent by telecopy with confirmed receipt
(with hard copy to follow). The mailing address of Premcor and Sabine is 8182
Maryland Avenue, St. Louis, Missouri 63105. The mailing address of Blackstone is
345 Park Avenue, 31st Floor, New York, New York 10154. The mailing address of
Oxy is 10889 Wilshire Boulevard, Los Angeles, California 90024. Any party hereto
may, from time to time by notice in writing served upon the other as aforesaid,
designate a different mailing address or a different person to which all such
notices, demands or requests thereafter are to be addressed.

          17.  Counterparts. This Agreement may be executed in counterparts,
each of which when so executed shall be deemed to be an original, and such
counterparts shall together constitute one and the same instrument.


                                                                               6

          IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the day and year first above written.

                        PREMCOR INC.


                        By:
                            ----------------------------------------------------
                            Name:
                            Title:


                        SABINE RIVER HOLDING CORP.


                        By:
                            ----------------------------------------------------
                            Name:
                            Title:


                        OCCIDENTAL PETROLEUM CORPORATION


                        By:
                            ----------------------------------------------------
                            Name:  Stephen I. Chazen
                            Title: Executive Vice President -- Corporate
                            Development and Chief Financial Officer


                        OCCIDENTAL C.O.B. PARTNERS
                        By: OXY USA Inc.
                            Its Managing Partner


                        By:
                            ----------------------------------------------------
                            Name:  Stephen I. Chazen
                            Title: Executive Vice President


                                                                               7

                        BLACKSTONE CAPITAL PARTNERS
                         III MERCHANT BANKING FUND L.P.


                        By: Blackstone Management Associates III
                        L.L.C., its general partner


                        By:
                            ----------------------------------------------------
                            Name:
                            Title:


                        BLACKSTONE OFFSHORE CAPITAL
                         PARTNERS III L.P.

                        By: Blackstone Management Associates III
                        L.L.C., its general partner


                        By:
                            ----------------------------------------------------
                            Name:
                            Title:


                        BLACKSTONE FAMILY INVESTMENT
                         PARTNERSHIP III L.P.

                        By: Blackstone Management Associates III
                        L.L.C., its general partner


                        By:
                            ----------------------------------------------------
                            Name:
                            Title: