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Site Background Information: Cherokee Truck Stop <br /> AGE NC Project No. 97-0312 <br /> Page 6 of 11 <br /> water pressure were continuously measured as the piezocone was advanced to depth. <br /> Grab ground water samples were collected in soil borings advanced immediately adjacent to the <br /> initial CPT boring. The samples were collected utilizing the 25-ton truck-mounted CPT drill rig <br /> equipped with 1.75-inch diameter hollow-stem rods fitted with a HydroPunchO. ground water <br /> sampling assembly, which was pushed to-specified sampling depths in each soil boring. Grbund <br /> water samples were collected from specified depth, intervals (zones) based on the acquired <br /> CPT-lithology data indicating favorable conditions for sampling.The HydroPunch sampling tool was <br /> pushed into the specified zone,then withdrawn approximately four feet to expose an inlet screen; <br /> the interior of the sampling tool filled with water and a.1-inch,outer diameter(O.D.)stainless steel <br /> bailer was lowered and utilized to extract a ground water sample. Grab ground water samples were <br /> collected from the CPT boring locations at the following intervals: <br /> • CPT-1 was sampled.at 64 feet to 68 feet bsg and 101.5 feet to 105.5 feet bsg; and <br /> CPT-2 was sampled at 64 feet to 68 feet bsg and 103 feet to 107 feet bsg. <br /> Following sample collection,the samples were placed in laboratory=supplied containers, properly. <br /> labeled and transported under chain of custody to State of California Department of Health Services <br /> (DHS)-certified laboratory and-all samples were analyzed for: <br /> • Total petroleum hydrocarbons quantified as gasoline and as diesel(TPH-g and TPH=d) in <br /> accordance with EPA Method 8015,Modified; <br /> Benzene, toluene, ethylbenzene and total xylenes (BTEX) and the fuel additives methyl <br /> tertiary-butyl ether(MTBE), di-isopropyl ether(DIPE), ethyl tertiary-butyl ether(ETBE), <br /> tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), methanol, ethanol, ethylene <br /> dibromide (EDB) and 1,2-dichloroethane (1,27DCA) and Trichloroethane (TCE) and <br /> tetrachloroethane(PCE)in accordance with EPA Method 8260B. <br /> CPT FINDINGS <br /> The computer-generated CPT lithologic logs were integrated with previous subsurface soil <br /> descriptions to construct the subsurface geological:model;the hydrocarbon impact to ground water <br /> and soil was quantified by laboratory analysis -of the grab ground water and soil samples, as <br /> presented below. <br /> Advanced GeoEnvironmentat,Inc. <br /> I <br /> i <br />