REGION VII WAS NOTIFIED ON AUGUST 7, 1980 OF THE HAZARDOUS WASTES GENERATED AT THE QUANTUM FACILITY (AT THAT TIME IT WAS CALLED CHEMPLEX COMPANY). REGION VII PROVIDED THE FACILITY WITH AN EPA IDENTIFICATION NUMBER, IAD045372836. THE PART A PERMIT APPLICATION WAS RECEIVED NOVEMBER 7, 1980. THE FACILITY ACHIEVED INTERIM STATUS AS A STORAGE FACILITY. REGION VII PERFORMED A RCRA FACILITY ASSESSMENT AT THE FACILITY IN 1989 AND NUMEROUS AREAS OF CONCERN AND SOLID WASTE MANAGEMENT UNITS WERE IDENTIFIED. IN ADDITION, A REMEDIAL INVESTIGATION/FEASIBILITY STUDY WAS CONDUCTED AT THE FACILITY IN 1988-1989. REGION VII BEGAN NEGOTIATING AN ADMINISTRATIVE ORDER ON CONSENT (AOC) WITH THE CURRENT OPERATOR, QUANTUM CHEMICAL CORPORATION, IN NOVEMBER 1989. THIS AOC REQUIRES QUANTUM TO CONDUCT A RCRA FACILITY INVESTIGATION AND A CORRECTIVE MEASURES STUDY. THE AOC IS ISSUED PURSUANT TO SECTION 3008(H) OF RCRA.