1. SECTION 122(H)(1) OF THE COMPREHENSIVE ENVIRONMENTAL RE- SPONSE COMPENSATION, AND LIABILITY ACT ( CERCLA ). 2. CLEVE REBER SUPERFUND SITE SORRENTO, ASCENSION PARISH, LOUISIANA RESPONDENTS: 1. CIBA GEIGY CORPORATION 2. MONOCHEM, INC. 3. RHONE-POULENC, INC. 4. UNIROYAL CHEMICAL COMPANY, INC. 5. VULCAN MATERIALS COMPANY 3. THE SITE CONTAINS PITS THAT WERE ORIGINALLY USED AS A SOURCE OF BORROW MATERIAL FOR ROAD AND BRIDGE CONSTRUCT- ION. FROM 1968 UNTIL 1974, THE SITE WAS OWNED BY ASCENS- ION PARISH AND OPERATED AS A LANDFILL. FROM 1970 TO 1974, CLEVE REBER, PRESIDENT, AND SOLE PROPRIETOR OF ENVIRON- MENTAL CONTROLS COMPANY OF LOUISIANA, OPERATED THE SITE AS A LANDFILL. MR. REBER ACCEPTED THE HAZARDOUS SUB- STANCES FOR DISPOSAL IN THE LANDFILL. THE PRINCIPAL CONTAMINANTS OF CONCERN AT THE SITE WERE THE HAZARDOUS SUBSTANCES HEXACHLOROBENZENE (HEX OR HCB), HEXACHLOROBUTADIENE (HCBD), N-NITROSODIPHENYLAMINE, HEXA- CHLOROETHENE (HCE), AND TETRACHLOROETHENE, ALL CONSIDERED CARCINOGENS. THE PRIMARY HAZARDS TO HUMAN HELATH WERE I- DENTIFIED AS DIRECT CONTACT OR INGESTION OF ON-SITE SUR- FACE SOIL, SEDIMENT, SURFACE WATER, LEACHATE, AND GROUND- WATER WITHIN THE ACQUIFER BENEATH