REGION IX HAS PROPOSED TO FILE A CIVIL ACTION SEEKING JUDICIAL ENFORCEMENT OF EPA'S RIGHT OF ACCESS UNDER SECTION 104(E) OF CERCLA, AS AMENDED, TO IMPLEMENTATION OF THE REMEDIAL ACTION AT THE IRON MOUNTAIN MINE SITE LOCATED NEAR REDDING, CALIFORNIA. THE MINE IS LOCATED 9 MILES OUTSIDE OF REDDING ON 4,400 ACRES OF PROPERTY OWNED BY IRON MOUNTAIN MINES, INC (IMMI). MILL TAILINGS WERE DEPOSITED AT NUMEROUS LOCATIONS AROUND THE SITE. ACID MINE DRAINAGE(AMD), WHICH HAS VERY HIGH METAL CONCEN- TRATIONS AND A VERY LOW PH, DISCHARGED FROM NUMEROUS POINT AND NONPOINT SOURCES INTO STREAMS ON THE SITE AND EVENTUALLY ENTERED IN THE SACRAMENTO RIVER, A WATER SUP- PLY SOURCE AND IMPORTANT SALMON SPAWNING AREA. APPOROXI- MATELY 4,000 POUNDS PER DAY OF HEAVY METALS ARE DISCHARGED FROM THE SITE. IN 1982, THE EPA ISSUED NOTICE LETTERS TO IMMI INFORM- ING THE COMPANY OF ITS STATUS AS A POTENTIALLY RESPONSIBLE PARTY (PRP). BUT THE IMMI RETURNED AN INCOMPLETE PROPOSAL TO ADDRESS THE CONDITIONS AT THE SITE. THEN REGION IX ISSUED SEVERAL ROUNDS OF LETTERS UNDER RCRA SECTION 3007 (A) AND CERCLA SECTION 104(E), ONLY TO GET AN INADEQUATE REPONSE FROM THE IMMI. ON OCTOBER 3, 1986, A RECORD OF DECISION WAS SIGNED BY THE REGIONAL ADMISTRATION, TO GIVE IMMI AN OPPORTUNITY TO SUBMIT ITS CLEAN-UP PLAN FINAL FORM WH