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B <br /> 7-Moog M- woo-wou -7 <br /> r ­ <br /> A,gPlIvol 0e0SysPams 4191-E Nr.+tr Inn Road, S'wramenlo, CA 95026 (916) 45.-2901 <br /> u FREMONT a IRVINE a HODS TON a BOSTON a SACRAMENTO •CULVER CITY a SAN JOSE <br /> June 4, 1991 <br /> 0531niinf <br /> ACS 30003-1 <br /> Mr. Mike Infurna <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> i Subject: Telephone Conversation Regarding Work Plan for a Soil Investigation ane! <br /> Vapor-Extraction Test at ARCO Service Station No. 2130, 7609 North 1=. <br /> Dorado Street, Stockton, California. <br /> Mr. Infurna: <br /> Applied GeoSystems, Inc./RESNA Industries (Applied GeoSystems) is writing IL; <br /> details of our telephone conversation of May 30, '.991, regarding the sui:!ct site. <br /> discussed three main points: (1) the location of vapor-extraction wells, (2) installation of <br /> conductor casing betwean Ole new gasoline tanks, and (3) the location of a second cavity ? <br /> and s impling before backs►►ling. <br /> soil'n s ' borings drilled near the existing Vapor•exiraction wells will be installed t bo g gasoline tank g <br /> cavity instead of north of the station building as previously planned. The screened interval <br /> f tine well closest to the fill port of the existing tanks will extend from appro:amately 12 to <br /> ;;et below grade. The screened interval in the remaining vapor-extraction wells drilled <br /> near the tank caviti will extend from approximately 15 to 25 feet below grade. if the <br /> borings extend deeper than the well depths,the borings will be backfilled with a bentonite- <br /> cement slurry to the appropriate depth before imtalling the well. <br /> If results of laboratory analyses indicate soil samples collected from the base of the tank <br /> cavity excavation contain hydrocarbons in concentrations that warrant remediation, a <br /> six conductor-casings, two between each tank,-will be-installed-from-the base-..------------- ---------------------------- <br /> of the tanks -n ''1e ground surface. Twelve-inch-diameter polyvinyl chloride pile will be <br /> used fo 1: casing. The conductor casing will be driven approxi matel} ;s sato <br /> native soii :,, .aen surrounded by clean pea gravel backfill. <br />