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+ _ ^ <br /> r� <br /> The Meld work for the CAR was completed in September, 1990. Based on the results of <br /> is <br /> pa USTEC's contamination assessment, the following conclusions were reached. <br /> o The soils beneath the Coca-Cola site in the area of the former 1,000-gallon gasoline <br /> UST have been contaminated with petroleum hydrocarbons as diesel and gasoline. <br /> Total petroleum hydrocarbon and total benzene,toluene,ethylbenxenc,and xylene <br /> ' concentrations are above those whish typically require remediation. <br /> I <br /> �A 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 Coca-Cola site has bren contaminated with minor <br /> amounts of petroleum hydrocarbons. Hydrocarbon concentrations, however, may <br /> be low enough to warrant a monitor only approach. <br /> t o The groundwater flow direction at the site appears to be towards the northeast. <br /> r; <br /> ►,, Based on the results of the investigation, USTEC recommends the fallowing actions: <br /> a 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 /> l be analyzed for the aromatic hydrocarbons;benzene, ethylbenzene, toluene, and <br /> xylenes in accordance with EPA method 8020. Hydrocarbon concentrations do <br /> not appear to warrant remediation at this time. <br /> o A Remedial Action Plan (RAP) should be prepared for the 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 1,000 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 . <br /> I <br /> 1M <br />