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Applied GeoSystems 4191-E Power Inn Road, Sacramento, CA 95826 (916) 452-2901 <br /> • FREMONT • IRVINE • HOUSTON • BOSTON • SACRAMENTO • CULVER CITY • SAN JOSE <br /> JUN 6 1991 <br /> ENVIRONMENTAL HEALTH June 4, 1991 <br /> PERMIT/SERVICES 0531minf <br /> AGS 31009-1 <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 /> Subject: Telephone Conversation Regarding Work Plan for a Soil Investigation and <br /> Vapor-Extraction Test at ARCO Service Station No. 2168, 414 West Charter <br /> Way, Stockton, California. <br /> Mr. Infurna: <br /> Applied GeoSystems, Inc./RESNA Industries (Applied GeoSystems) is writing to confirm <br /> details of our telephone conversation of May 30, 1991, regarding the subject site. We <br /> discussed three main points: (1) the location of vapor-extraction wells, (2) installation of <br /> conductor casing between the new gasoline tanks, and (3) sampling the proposed tank cavity <br /> before installing the new tanks. <br /> Vapor-extraction wells will be installed in soil borings drilled near the existing gasoline tank <br /> cavity instead of north of the station building as previously planned. The screened interval <br /> of the well closest to the fill port of the existing tanks will extend from approximately 12 to <br /> 22 feet below grade. The screened interval in the remaining vapor-extraction wells drilled <br /> near the tank cavity 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 installing 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 /> maximum of six conductor casings will be installed from the base of the cavity to the ground <br /> surface. Twelve-inch-diameter polyvinyl chloride pipe will be used for conductor casing. <br /> The conductor casing will be driven approximately 2 feet into native soil and then <br /> surrounded by clean pea gravel backfill. The conductor casing will allow soil borings to be <br /> drilled after the tank cavity is backfilled to continue further investigation of soil conditions <br /> beneath the tanks. Vapor-recovery wells can be installed in borings drilled through the <br /> conductor casing if remediation of soil beneath the tanks is warranted. <br />