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i404 WEST FREMONT STREET <br /> WKA No 1628 02 <br /> 1 September 2, 1994 <br /> Page 3 <br />' of 2,241 mg/kg In sample SI and 2 1 mg/kg in sample S2 Test results of a water sample <br /> collected from well MW1 sometime between October 29 and November 11, 1986, revealed a <br />' TPH-gasoline concentration of 1158 mg/f and a benzene concentration of 1 539 mg/f <br /> 1 Soil samples S-16-1, S-16-2, S-18-3, and S-18-5 were collected during additional excavation of <br /> contaminated soil on January 14, 1987 The samples were collected from depths of 16 and 18 <br /> Ifeet Test results revealed TPH-g concentrations ranging from 0 8 mg/kg to 596 mg/kg <br /> The excavation was reportedly deepened on July 29, 1987, to a depth of approximately 22 feet <br /> No record of soil sampling during this excavation was found on file with the SJCEHD The <br /> excavation was reportedly backfilled with clean imported soil and the contammated soil was <br /> 1 stockpiled on-site <br /> On January 13, 1988, a representative of AGS visited the site and used a portable soil vapor <br /> laboratory to evaluate the lateral extent of hydrocarbon contamination in both the soil and ground <br /> water Samples collected during the soil vapor Investigation reported no detectable levels of <br /> BTEX (Benzene, Toluene, Ethylbenzene, or Xylenes) above a detection level of 2 parts per <br /> million (ppm) Results of the soil vapor survey are Included in an AGS report dated March 15, <br /> 1988 <br /> A January 11, 1991 AGS letter to Crystal Creamery reported that a composite sample of <br /> stockpiled soils had been analyzed for TPH-g and BTEX Results of the laboratory tests were <br /> below detection levels, however the stockpiled soils were removed at the request of Crystal <br /> Creamery and transported to Holt Dump near Stockton <br /> On April 8, 1992, one water sample was collected by Wallace ■ Kuhl & Associates (WKA) from <br /> well MW1 A sheen of product was observed on the water prior to sampling Test results <br /> revealed TPH-g concentrations of 20,000 Mcg/f and elevated BTEX concentrations <br /> During December, 1992 WKA Installed and sampled three monitoring wells (MW2, MW3, and <br /> MW4) at the locations shown on Plate 2 Results of the Investigation Indicated that gasoline and <br /> WALLACE KUHL <br /> 2ecy,iedIMMT &ASSOCIATES INC <br />