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2. APPARENT PROBLEM As previously stated, the Corral Hollow Sanitary Landfill is designated as a Class III disposal facility (Class II-2 sites were redesignated by the California Department of Health Services (DOHS) as Class III ' facilities in 1984) (15). In May 1970, a report prepared by the California Department of Water Resources stated that, in the past, Class I wastes that had been disposed of at the site included pesticide ' containers and drilling muds. Photographs of an oily pond and pesticide containers appeared in the report (12). According to the Preliminary Assessment of the site prepared by the ' California Department of Health Services, the Celotex Corporation has apparently been disposing of powdered isocyanate chemicals, aluminum foil, and fiberglass at CHSL since 1980. The chemicals were apparently shavings from insulation board manufactured at a nearby Celotex facility. According to Celotex officials all of the plant's waste ' material is inert and nonhazardous. PIT was unable to locate information verifying this assumption. The site was evaluated for possible inclusion on the EPA's Open Dump Inventory list on June 18, 1981. A report summarizing this evaluation indicated that site maintenance personnel and Tracy citizens were concerned about the public ' health hazard that might arise if these chemicals became airborne (13). City of Tracy and San Joaquin County officials stated that Celotex only uses CHSL for sawdust disposal (7). ' There have been several documented incidents of hazardous waste disposal at the landfill. According to an inspection report filed by the San ' Joaquin Local Health District, there was a one-time asbestos dumping event on March 12, 1982. The amount of asbestos accepted on that date is not known. According to the report, there has been no evidence of asbestos disposal at the landfill before or since this one incident (11). 2-1 sa/tm/chl/si