SINCE 1953, AEROJET GENERAL CORPORATION (AEROJET) AND ITS WHOLLY OWNED SUBSIDIARIES HAVE DISPOSED OF LARGE QUAN- TITIES OF HAZARDOUS SUBSTANCES AT ITS SITE IN RANCHO COR- DOVA, CALIFORNIA (NEAR SACRAMENTO). THE DISPOSED SUBSTANCES HAVE INCLUDED ROCKET PROPELLANTS, HERBICIDES, ARSENICS, ALL TYPES OF SOLVENTS AND OTHER ORGANIC AND INORGANIC SUBSTANCES FOUND THROUGH SAMPLING CONDUCTED OVER THE PAST FEW YEARS. CONTINUED SAMPLING HAS REVEALED COPNTAMINATION OF SOIL, SURFACE WATER AND GROUNDWATER, BOTH ON AND OFF AEROJETS PROPERTY. SEVERE GROUNDWATER CONTAMINATION IS OF PARTICULAR CONCERN SINCE IT HAS MIGRATED INTO PUBLIC DRINKING WATER SUPPLIES. THE MOST PREVALENT CHEMICAL FOUND IN THE GROUND- WATER IS TRICHLOROETHYLENE (TCE). IN 1979, THE STATE OF CALIFORNIA FILED A LAWSUIT A- GAINST AEROJET IN AN EFFORT TO REMEDY THE SEVERE CONTAMINA- TION CAUSED BY THE COMPANY. AS A RESULT OF THAT LAWSUIT, AEROJET HAS CONDUCTED EXTENSIVE TESTING AND ANALYSIS OF ITS ENVIRONMENTAL PROBLEM, AND HAS ALSO DEVELOPED ITS OWN PLAN ATTEMPTING TO REMEDY THE CONTAMINATION. SOME INFORMATION OBTAINED BY EPA REGION IX WHICH IS PURSUANT TO RCRA 3007 AND CERCLA 104 REVEALED THAT AEROJET HAS NOT ADEQUATELY DEFINED THE FULL EXTENT OF IT'S PROBLEM AND THAT THE COMPANY'S NEW REMEDIAL PLAN MAY NOT BE ADEQUATE TO ASSURE LONG TERM PRO- TECTION OF THE PUBLIC HEALTH AND THE ENVIRONMENT. BECAUSE OF THESE DEFICIENCES, THE THRESHOLD GOAL