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CLOSURE SOLLNS, INC. [RECENED <br /> LA <br /> JUN 2 3 2008 <br /> LJune 17 2008 ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> LMr. Frank Girardi <br /> San Joaquin County Environmental Health Department <br /> 600 E. Main Street <br /> LStockton, California 95202 <br /> Re: WORK PLAN FOR TEMPORARY SOIL VAPOR PROBES <br /> L <br /> L Boyett Petroleum - Manteca <br /> 419 S. Main Street <br /> Manteca, California <br /> San Joaquin County LOP Case No. 1433 <br /> Central Valley RWQCB LUFT Case No.390972 <br /> LDear Mr. Girardi: <br /> On behalf of Boyett Petroleum, Closure Solutions Inc. (Closure Solutions) has prepared this <br /> L Work Plan for Temporary Soil Vapor Probes, (Work Plan) for the Manteca Site located at <br /> 419 S. Main Street, Manteca, California (the Site). This Work Plan is being submitted in <br /> Lorder to assess the potential for soil vapor migration at the site. Constituents of concern at <br /> the Site are very low to non-detectable. No further action (NFA or environmental site <br /> Lclosure) status will be requested for the Site if the results of the proposed soil vapor <br /> assessment are favorable. <br /> 1.0 BACKGROUND <br /> LFollowing is a summary of the findings of previous investigations at the Site. A detailed site <br /> history is included as Attachment A. <br /> 1.1 Site Geology and Hydrology <br /> Previous Site investigations indicated that there is an upper soil horizon (surface to <br /> Lapproximately 22 feet below ground surface [bgs]) dominated by relatively continuous, fine- <br /> grained soil types with sandy interbedding and clay horizons. A clay to silty clay horizon of <br /> Lvariable thickness was encountered from approximately 22 to 28 feet bgs and appears to be <br /> continuous throughout the Site. A continuous, coarse sand horizon in the upper soil horizon <br /> Lwas encountered at approximately 28 to 53 feet bgs. The shallow Site wells are screened in <br /> the upper soil horizon and the deep Site wells are screened below the clay to silty clay <br /> horizon. Depth to groundwater at the Site typically ranges between 13 and 26 feet bgs. <br />.L <br /> 1243 Oak Knoll Drive o Concord, CA 94521 <br /> (800) 988-7880 <br /> w�ir��.ClosrzrzSolutii�ns.conl <br />