EXHIBIT 10.6

  AMENDMENT NUMBER ONE, dated as of January 26, 1994 (this "Amendment"), to 
CREDIT AGREEMENT, dated as of November 30, 1990, and Amended and Restated as of 
February 10, 1993, as thereafter amended (the "Credit Agreement"), among CLARK 
REFINING & MARKETING, INC. (formerly CLARK OIL & REFINING CORPORATION), a 
Delaware corporation (the "Company"), the banks signatory thereto (each a "Bank"
and, collectively, the "Banks"), BANKERS TRUST COMPANY, a New York banking 
corporation, as an Issuing Bank, THE TORONTO-DOMINION BANK, a Canadian chartered
bank, as Co-Agent, and BT COMMERCIAL CORPORATION, a Delaware corporation, as a 
Bank and as agent for the Banks (in such capacity, including its successors and 
permitted assigns, the "Agent"). Terms which are capitalized herein and not 
otherwise defined shall have the meanings ascribed thereto in the Credit 
Agreement.

  WHEREAS, the Company has requested that the Agent and the Banks agree to (i) 
amend certain provisions of the Credit Agreement and (ii) consent to the 
purchase of insurance from HSM Insurance Ltd., a company organized under the 
laws of Barbados and a wholly owned subsidiary of Horsham (the "Insurer"); and

  WHEREAS, the Agent and the Banks have considered and agreed to the Company's 
requests, upon the terms and subject to the conditions set forth in 
this Amendment;

  NOW, THEREFORE, in consideration of the foregoing, and for other good and 
valuable consideration, the receipt and sufficiency of which are hereby 
acknowledged, the parties hereto hereby agree as follows:

  SECTION ONE - AMENDMENTS
  -----------   ----------

  Upon the fulfillment of the conditions set forth in Section Three hereof, 
the Credit Agreement is hereby amended as follows:

    (1) Section 1.1 of the Credit Agreement is amended by deleting the
  definition of the term "Company" contained in such Section and replacing it
  with the following:

      "Company" means Clark Refining & Marketing, Inc., a Delaware corporation."

 
                                      -2-


          (2)  Section 6.13C of the Credit Agreement is amended by deleting such
     Section in its entirety and replacing it with the following:

               "C.  Minimum Net Worth.  The Company shall not permit or suffer 
          its Net Worth at any time during any period listed below to be less
          than the amount set forth opposite such period:

               Period                                    Amount
               ------                                    ------

January 1, 1994 to December 31, 1994                 "$140,000,000
January 1, 1995 to December 31, 1995                   175,000,000"

          (3)  References in the Loan Documents to "Clark Oil & Refining 
     Corporation" or the "Company" shall be deemed to be references to "Clark 
     Refining & Marketing, Inc."

          SECTION TWO - CONSENTS
          -----------   --------

          (1) Effective upon the fulfillment of the conditions set forth in
Section Three hereof, each Bank hereby consents to the purchase by the Company
of insurance in respect of environmental liabilities of the Company, on the
terms and conditions set forth in the Insurance Policy attached hereto as Annex
1, from the Insurer at an aggregate cost not to exceed $2,000,000 in any Fiscal
Year if, and for so long as:

          (a)  The Insurer is a Wholly Owned Subsidiary of Horsham;

          (b)  The Insurer provides to the Agent, on behalf of the Banks, within
     30 days following the end of each Fiscal Quarter, the consolidated balance
     sheet of the Insurer as at the end of such Fiscal Quarter and the related
     consolidated statements of income and shareholder's equity and cash flows
     of the Insurer, in each case certified by the chief financial officer of
     the Insurer to the effect that they fairly present the consolidated
     financial condition of the Insurer as at the dates indicated and the
     results of its operations and changes in its financial position, based on
     GAAP applied on a consistent basis;

 
                                      -3-


          (c)  On the date hereof and within 10 days following the end of each 
     Fiscal Year beginning with the Fiscal Year ended December 31, 1994, the
     Company delivers to the Agent, on behalf of the Banks, the written opinion
     of Marsh & McLennan Limited to the effect that the insurance arrangement
     between the Company and the Insurer is fair to the Company; and

          (d)  The Insurer delivers to the Company the consolidated balance 
     sheet of the Insurer as of a recent date certified by its chief financial
     officer to the effect that such balance sheet fairly presents the financial
     condition of the Insurer as of its date in accordance with GAAP.

          (2)  Effective upon the fulfillment of the conditions set forth in 
Section Three hereof, each Bank hereby consents to (x) the deletion of 
"PaineWebber Inc." from Schedule 1-D to the Credit Agreement and to the addition
of "Dean Witter Inc." to such Schedule 1-D and (y) the execution and delivery of
a Commodities Account Agreement by the Company, the Collateral Agent and Dean 
Witter Inc., as Broker (the "Dean Witter Agreement").

SECTION THREE - CONDITIONS PRECEDENT
- -------------   --------------------

          Upon the fulfillment of the following conditions the amendments and
consents contemplated by this Amendment shall become effective:

          (1)  All representations and warranties of the Company set forth in 
     Section 4 of the Credit Agreement and Section Four of this Amendment shall
     be true and correct in all material respects on and as of the date hereof,
     and, immediately before and immediately after giving effect to the
     effectiveness of this Amendment, no Unmatured Event of Default and no Event
     of Default shall have occurred and be continuing at such time;

          (2)  Since December 31, 1991, nothing shall have occurred or become 
     known that the Agent shall have determined has a Materially Adverse Effect;

          (3)  The Agent shall have received a certificate from the Company, 
     executed by the Company's

 
                                      -4-

  Treasurer or Chief Financial Officer, as to the effect of paragraphs (a) and 
  (b); and

    (4) The Collateral Agent, the Company and Dean Witter Inc., as Broker, shall
  have entered into a Commodities Account Agreement and such Agreement shall be
  in full force and effect and the Secured Parties shall have obtained, to each
  Secured Party's satisfaction, a valid and enforceable perfected security
  interest in the Collateral thereunder on the terrms contemplated by the Loan
  Documents and such Collateral shall be subject to no Liens other than the
  Liens permitted thereunder.

    SECTION FOUR - REPRESENTATIONS AND WARRANTIES
    ------------   ------------------------------

    The Company hereby confirms, reaffirms and restates the representations and
warranties made by it in Section 4 of the Credit Agreement, as amended hereby,
and all such representations and warranties are true and correct in all material
respects as of the date hereof. The Company further represents and warrants
(which representations and warranties shall survive the execution and delivery
hereof) to the Agent, for the benefit of the Banks and to any Issuing Bank that:

    (1) The Company has the corporate power, authority and legal right to
  execute, deliver and perform this Amendment, and the transactions contemplated
  hereby, and has taken all actions necessary to authorize the execution,
  delivery and performance of this Amendment and the transactions contemplated
  hereby;

    (2) No consent of any person (including, without limitation, shareholders or
  creditors of the Company, as the case may be) other than the Required Banks,
  and no consent, permit, approval or authorization of, exemption by, notice or
  report to, or registration, filing or declaration with, any governmental
  authority is required in connection with the execution, delivery, performance,
  validity or enforceability of this Amendment and the transactions contemplated
  hereby;

    (3) Each of this Amendment and the Dean Witter Agreement has been duly 
  executed and


                                      -5-
 
     delivered on behalf of the Company by its duly authorized officer, and
     constitutes a legal, valid and binding obligation of the Company,
     enforceable in accordance with its terms, except as the enforceability
     thereof may be limited by applicable bankruptcy, reorganization,
     insolvency, moratorium or other laws affecting creditors' rights generally;
     and
   
          (4) The execution, delivery and performance of this Amendment and the 
     Dean Witter Agreement will not violate any requirement of law or 
     contractual obligation of the Company.

          SECTION FIVE - MISCELLANEOUS
          ------------   -------------      

          (1) Except as herein expressly amended, the Credit Agreement and all 
other agreements, documents, instruments and certificates executed in connection
therewith, except as otherwise provided herein, are ratified and confirmed in 
all respects and shall remain in full force and effect in accordance with their 
respective terms.

          (2) All references to the Credit Agreement or any of the other Loan 
Documents shall mean the Credit Agreement or such other Loan Documents, as the 
case may be, as amended as of the effective date hereof, and as amended hereby
and as hereafter amended, supplemented and modified from time to time. All 
references in the Loan Documents to Schedule 1-D to the Credit Agreement shall 
mean Schedule 1-D as amended as of the effective date hereof, and as amended 
hereby and as hereafter amended, supplemented and modified from time to time.

          (3) This Amendment may be executed by the parties hereto individually 
or in combination, in one or more counterparts, each of which shall be an 
original and all of which shall constitute one and the same agreement.

          (4) This Amendment shall be governed by, construed and interpreted in 
accordance with, the internal laws of the State of New York.


 
 
                                      -6-



        IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be 
duly executed as of the date first above written.


                                            CLARK REFINING & MARKETING, INC.
                                            (formerly CLARK OIL & REFINING
                                            CORPORATION)

                                            By: /s/ Dennis R. Eichholz
                                               ---------------------------------
                                               Title: Treasurer
                                                        

                                            BT COMMERCIAL CORPORATION, as
                                              Agent and as a Bank

                                            By: /s/ Christopher Kinslow
                                               ---------------------------------
                                               Title: Vice-President
                                                       

                                            BANKERS TRUST COMPANY, as an
                                              Issuing Bank

                                            By: /s/ Christopher Kinslow
                                               ---------------------------------
                                               Title: Vice-President
                                                          
                                                                                
                                            THE TORONTO-DOMINION BANK, as a 
                                              Bank and as Co-Agent 

                                            By: /s/ Martin T. Snyder
                                               ---------------------------------
                                               Title: Director Corporate Finance
                                                          
                                                                                
                                            SWISS BANK CORPORATION, New York
                                              Branch, as a Bank

                                            By: /s/ William N. Schwarze
                                               ---------------------------------
                                               Title: Director-Commodity Trade
                                                        Finance
                                                          
                                            By: /s/ David S. Dickenson
                                               ---------------------------------
                                               Title: Director-Commodity Trade
                                                        Finance



 
                                      -7-

                                            NATIONAL CITY BANK, as a Bank

                                            By: /s/ Brian J. Karrip
                                               ---------------------------------
                                               Title:   Vice President

                                            DRESDNER BANK AG, Chicago Branch, 
                                              as a Bank

                                            By: /s/ John H. Schaus
                                               ---------------------------------
                                               Title:  First Vice-President

                                            By: /s/ Brian J. Brodeur
                                               ---------------------------------
                                               Title:     Vice-President
                                                                                

                                            LASALLE NATIONAL BANK, as a Bank

                                            By: /s/ Christopher G. Clifford
                                               ---------------------------------
                                               Title:  First Vice-President
Acknowledged by:

BANKERS TRUST COMPANY,
   as Collateral Agent

By: /s/ Christopher Kinslow        
   ---------------------------------
   Title:   Vice-President