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App/iea° GeoSystems 4191 -E Power Inn Road, Sacramento, CA 95826 (916) 452-2901 <br /> • FREMONT • IRVINE • HOUSTON • BOSTON • SACRAMENTO • CULVER CITY • SAN JOSE <br /> June 4, 1991 <br /> 0531minf <br /> AGS 30003-1 <br /> Mr. Mike Infurna <br /> San Joaquin County Public Health Services <br /> N, QEnvironmental Health Division % <br /> P.O. Box 2009 k11111 ; :/ ` <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. 2130, 7609 North El <br /> Dorado Street, 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) the location of a second cavity <br /> and sampling before backfilling. <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 thai, the well depths, the borings will be backfilled with a berltonite- <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, two between each tank, will be installed from the base <br /> of the tanks to the ground surface. Twelve-inch-diameter polyvinyl chloride pipe will be <br /> used for conductor casing. The conductor casing will be driven approximately 2 feet into <br /> native soil and then surrounded by clean pea gravel backfill. <br />