ON 12/4/98, RESPONDENT DISCHARGED A MIXTURE OF WASTEWATER, TOLUENE AND HEXANE FROM THE FACILITY TO THE CITY OF BRIGHTON, COLORADO'S POTW. THIS DISCHARGE RESULTED IN AN EXPLOSION OF A SEWER LINE WITH THE CITY OF BRIGHTON'S SEWAGE COLLECTION SYSTEM. THE PROPOSED PENALTY FOR THIS VIOLATION IS $11,000.