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rCoca-Cola Enterprises - West <br /> Job No. 90054 A <br /> conclusions were reached: <br /> F <br /> o The soils beneath the Coca-Cola site in the area of the former 1,000-gallon <br /> gasoline UST have been contaminated with petroleum hydrocarbons as diesel <br /> and gasoline. TPH and BTEX concentrations are above those which typically <br /> require remediation. <br /> o The soils beneath the Coca-Cola site consist of an alluvial sequence of interbedded <br /> sand,silts,and clays. The aquifer material is primarily sand and is located about <br /> 65 to 70 feet below land surface. <br /> o The groundwater beneath the Cora-Cola site has been contamination with minor <br /> amounts of petroleum hydrocarbons. The hydrocarbon concentrations do not <br /> appear to warrant remediaiton at this time. <br /> j o The groundwater flow direction at the site appears to be towards the northeast <br /> ' with a gradient of about 13.9 feet per mile. <br /> { 10.0 RECOMMENDATIONS <br /> I� Based on the results of the investigation, USTEC recommends the following actions: <br /> o At least one additional downgradient monitoring well should be installed and <br /> sampled. <br /> o Groundwater monitoring and sampling should continue on a quarterly basis to <br /> monitor potential contaminant migration and to provide verification of any <br /> remedial measures implemented at the site. Groundwater samples should be ? <br /> analyzed for total petroleum hydrocarbons in accordance with EPA method 8015 <br /> modified for diesel and gasoline. In addition, all groundwater samples should <br /> be analyzed for the aromatic hydrocarbons; benzene, toluene, ethylbenzene, and <br /> xylenes in accordance with EPA method 8020. <br /> o A Remedial Action Plan (RAP) should be prepared for soil beneath the site. <br /> The RAP should include at least six additional soil borings to further quantify <br /> :. the hydrocarbon contamination around the former 1,600-gallon gasoline UST <br /> location. At least four of these borings should be converted to vapor extraction <br /> test wells. A vapor extraction pilot test should be conducted to assess the <br /> feasibility and aid in the design of a soil remediation system. <br /> T o A copy of this report be provided to the San Joaquin County Public Health - <br /> f Services at the address presented below: <br /> 19 <br /> ex . <br /> t <br />