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P.O.Boa 576981-6981 <br /> M.J. Kloberdanz & Associates Modesto, California 95357 <br /> Environmental Assessment Phone: (209) 577-8186 <br /> Fax: (209) 577-8158 <br /> 0217 January 4, 2000 <br /> Lori Duncan <br /> San Joaquin County JAN 0 6 2000 <br /> Environmental Health Division <br /> P.O. Box 2009 ENVIRONMENTAL HEALTH <br /> Stockton, California 95201 PERMIT/SERVICES <br /> RE: <br /> Work Plan <br /> Subsurface Soil and Groundwater Investigation <br /> McDowell & Davis Towing, 1360 Escalon Avenue, Escalon, California <br /> 1.0 PROJECT IDENTIFICATION <br /> The following plan provides a scope of work that will help characterize the petroleum <br /> contamination disclosed during the underground tank removal at the above referenced <br /> property. We propose the use of a Geo-Probe to obtain soil and ground water samples for <br /> the preliminary characterization of the vertical extent of contamination. <br /> 1.1 Site Description and History <br /> Four underground fuel tanks were removed on March 15, 1999 by SEMCO under <br /> permit. Hydrocarbon odors were noted in the soil beneath the west end of the <br /> dispenser island area. Soil samples for analysis were collected as required from <br /> beneath the tanks, the dispenser islands, the piping lines, and from the soil <br /> stockpiles. Analytical results disclosed up to 210 ppb of MTBE, 2,700 ppb TBA <br /> and 570 ppb xylenes from the former tank pit, and 5,000 ppb TBA and 110 ppb <br /> xylenes from the former dispenser island area. <br /> 2.0 WORK PLAN <br /> M. J. Kloberdanz& Associates proposes to drill three borings to a depth of about 40 feet. <br /> The Geoprobe borings will be drilled in the area of formerly disclosed contamination; <br /> west side and the northeast side of the former excavation, and the area of the former <br /> dispenser piping. (Figure 2). A maximum of four soil samples will be collected at <br /> various depths. Since groundwater has been identified in the area at 70+ feet in depth, a <br /> water sample will not be obtained. Samples will be analyzed by GeoAnalytical <br /> Laboratories for gasoline BTEX, & MTBE. The bottom hole soil sample will be <br /> analyzed for the Oxygenated Compounds using Method 8260. <br /> A report of the subsurface investigation containing site map, boring logs, and soil and <br /> groundwater sampling records with laboratory data sheets will be prepared at the end of <br />