THE CLEVELAND MILL SUPERFUND SITE OCCUPIES ABOUT 18 ACRES APPROXIMATELY 5.5 MILES NORTH OF SILVER CITY IN GRANT COUNTY, NEW MEXICO. A MINE AND MILL WERE OPERATED AT THE SIT E DURING THE PERIOD FROM ABOUT 1910 TO 1949. ONLY FOUNDATION S OF THE MILL REMAIN. THERE ARE NO LONGER ANY BUILDINGS AT THE SITE. GENERALLY SPEAKING, THE SOURCE OF THE HAZARDOUS SUBSTANCES ST THE SITE IS APPROXIMATELY 30,000 CUBIC YARDS OF TAILINGS FROM MILLING OPERATIONS AT THE SITE, AND 15,000 YARDS OF WASTE ORE. THE TAILINGS AND WASTE ORE ARE LOCATED AT THE HEADWATERS OF AN INTERMITTENT STREAM KNOWN AS LITTLE WALNUT CREEK. THE MILL FOUNDATIONS AND MAIN TAILINGS PILES COVER AN AREA OF APPROXIMATELY FOUR ACRES. PRECIPATATION RUNOFF FROM THE SITE INTO LITTLE WALNUT CREEK IS HIGHLY ACIDIC, AND CONTRIBUTES TO THE EXTENSIVE LEACHING OF METALS FROM THE TAILINGS AND WASTE ORE. HAZARDOUS SUBSTANCES OF PRIMARY CONCERN INCLUDE ARESNIC, COPPER, LEAD, ZINC,AND OTHER METALS. THE REMEDIAL INVESTIGATION/FEASIBILTY STUDY (RI/FS) FOR THE SITE WAS COMPLETED BY THE STATE OF NEW MEXICO'S ENVIRONMENT DEPARTMENT UNDER A COOPERATIVE AGREEMENT DATED OCTOBER 1, 1990. EPA ISSUED THE PROPOSED PLAN, IDENTIFYING EPA'S PREFERRED ALTERNATIVE FOR THE SITE ON APRIL 9, 1993. THE PREFERRED REMEDY, OFF-SITE REPROCESSING, RECYCLING, AND DISPOSAL OF RESIDUALS IDENTIFIED BY