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i4 Executive Summary <br /> This report presents the results of the soil investigation conducted by Shaw Environmental Inc. <br /> (Shaw) at the Tracy Maintenance Station located a 2005 Krohn Road in Tracy, San Joaquin <br /> County, California (Figure 1). The Tracy Mainter ante Station is operated by the California <br /> Department of Transportation (Caltrans). The objet ive of the investigation was to evaluate the <br /> presence or absence of hazardous concentrations of contaminants in soil in the vicinity of the <br /> leachfield. <br /> i <br /> On February 18, 2003, Shaw observed the drilling of six soil borings (B-1 through B-6) and <br /> excavation of two trenches to evaluate the presence of the leach system. The presence of leach <br /> lines was confirmed by visual inspection with Ms. argaret_L goria of the San Joaquin County <br /> Environmental Health Department (SJCEHD) duri g excavation in the area of the former <br /> leachfield. The leach lines were encountered ata depth of approximately 1.2 meters (4 feet) <br /> below ground surface (BGS). The leach lines were bserved to be free of sludge accumulations <br /> or related residual products. <br /> Soil samples collected from the borings and trenches were reported to contain oil and grease <br /> ' (O&G) and heavy metals. The samples were not reported to contain total petroleum <br /> ' hydrocarbons as gasoline (TPHg); total petroleum hydrocarbons as diesel (TPHd); volatile <br /> organic compounds (VOCs); benzene, toluene, ethyl enzene, or xylenes (BTEX); fuel oxygenate <br /> -- compounds; ethanol or methanol; semivolatile organic compounds (SVOCs); chlorinated <br /> hydrocarbons, or organochlorine pesticides. <br /> Two soil samples collected from the trenches excavated near the leach lines were reported to <br /> contain O&G. The reported concentrations are not considered to be high. The O&G detected in <br /> the soil samples may originate from the leach system. <br /> Soil samples collected from the site were reported to contain chromium,'Iead, nickel, and'zinc. <br /> The soil samples were not reported to contain cad um or hexavalent chromium None of the <br /> detected heavy metals were present at concentr tions that exceeded U.S. Environmental <br /> Protection Agency, Region 9, industrial soil Preliminary Remediation Goals (PRGs). It is <br /> unlikely that the soil, should it become a waste, would be considered a hazardous waste. <br /> t � <br /> N:4sacDP120031Pl63035444.3ac.doc ES-1 <br />