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6. CONCLUSIONS <br /> The Corral Hollow Sanitary Landfill is a Class III municipal landfill <br /> located near Tracy, California. Municipal, commercial, and industrial <br /> solid wastes have been accepted at the landfill since 1946. Liquid and <br /> hazardous wastes are not accepted at the site. <br /> According to a 1970 report filed by the California Department of Water <br /> Resources, the Corral Hollow Sanitary Landfill had accepted Class I <br /> wastes such as oil and gas drilling muds and pesticide wastes. A 1-acre <br /> pond apparently containing drilling muds surrounded by hundreds of <br /> pesticide containers supported the Department's assertion. The pond and <br /> empty containers were not analyzed, however, so concrete evidence <br /> regarding the apparent disposal of hazardous wastes at the site does not <br /> exist. <br /> An on-site interview of landfill personnel (including City of Tracy and <br /> San Joaquin County officials) by Ecology and Environment's Field <br /> Investigation Team (E&E FIT) revealed that the actual contents of the <br /> landfill's impoundment were sludge from the City of Tracy's water <br /> treatment facility. The sludge was analyzed and found to contain metals <br /> such as copper, barium, and lead. The sludge, however, was not analyzed <br /> for organic chemicals. The presence of organic chemicals such as <br /> toluene and 1,1,1-trichloroethane (TCA) in soil samples (near the sludge <br /> pond site) and the presence of TCA and methylene chloride in several <br /> types of air tests suggests that sludge wastes may have contained <br /> hazardous organic chemicals. <br /> Landfill officials also stated that all pesticide containers were <br /> inspected by the San Joaquin County Agriculture Department before being <br /> accepted for disposal at the site. Pesticides were not detected in <br /> groundwater or soil samples. <br /> The presence of TCA at depths of 281 and 61 feet below ground surface in <br /> soil samples taken from the vicinity of the sludge pond suggests that <br /> 6-1 <br /> sa/tm/chl/si <br />