September 29, 1995 William S. Sudhaus CORE Refining Corporation 606 Pugh Road Strafford, PA 19087 Re: Stock and Asset Purchase Agreement ----------------------------------- Dear Bill: This will confirm our agreement, pursuant to Section 13.1(a) of the...

                            CASTLE ENERGY CORPORATION
                           Xxx Xxxxxx Xxxxxxxxx Xxxxxx
                                Xxxxxx, XX 00000

                                                              September 29, 0000

Xxxxxxx X. Xxxxxxx
CORE Refining Corporation
000 Xxxx Xxxx
Xxxxxxxxx, XX   00000

         Re: Stock and Asset Purchase Agreement
             -----------------------------------
Dear Xxxx:

         This will confirm our agreement, pursuant to Section 13.1(a) of the
Stock and Asset Purchase Agreement, dated as of May 25, 1995, as amended (the
"Purchase Agreement"), among Castle Energy Corporation, a Delaware corporation,
certain of Castle's subsidiaries, and CORE Refining Corporation, a Delaware
corporation, that the Purchase Agreement is hereby terminated, effective
immediately. This letter shall not affect any provisions of the Purchase
Agreement which by the terms of the Purchase Agreement survive termination.

                                          Sincerely,

                                          CASTLE ENERGY CORPORATION

                                          By: /s/ XXXXXX X. XXXXXX XX
                                              -------------------------------
                                                  Xxxxxx X. Xxxxxx XX

AGREED:
September 29, 1995

CORE REFINING CORPORATION

By: /s/ XXXXXXX X. XXXXXXX
    ------------------------
        Xxxxxxx X. Xxxxxxx