THIS IS A COMPLIANCE ORDER AGAINST THE COLORADO REFINING COMPANY PURSUANT TO SECTION 113(A)(1) OF CAA. COLORADO REFINING COMPANY OWNS AND OPERATES A PETROLEUM REFINERY IN COMMERCE CITY, COLORADO, WHICH IS SUBJECT TO A FEDERAL PREVENTION OF SIGNIFICANT DETERIORATION (PSD) PERMIT ISSUED ON FEBRUARY 28, 1979, AND MODIFIED ON DECEMBER 9, 1986. THIS COMPLIANCE ORDER REQUIRES THE COLORADO REFINING COMPANY TO SUBMIT AN ACCEPTABLE TEST PROTOCOL FOR CERTIFI- CATION OF THE CLAUS PLANT SO2 CEM SYSTEM WITHIN 15 CALENDAR DAYS FROM THE EFFECTIVE DATE OF THE ORDER. THE COMPANY IS THEN REQUIRED TO PERFORM THE CEM CERTIFICATION TEST WITHIN 30 CALENDAR DAYS FROM RECEIPT OF WRITTEN ACKNOWLEDGEMENT FROM EPA OF PROTOCOL APPROVAL. IN ADDITION, THIS COMPLANCE ORDER REQUIRES THE COLORADO REFINING COMPANY TO SUBMIT AN ACCEPTABLE QUALITY CONTROL PLAN TO EPA WITHIN 30 CALENDAR DAYS FROM THE EFFECTIVE DATE OF THIS ORDER. THIS PLAN SHALL BE IMPLEMENTED WITHIN 30 CALENDAR DAYS FROM RECEIPT OF WRITTEN EPA COMMENTS, OR EPA APPROVAL.