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CRYSTAL CREAMERY - STOCKTON S WKA No 1628 01 March 17, 1994 Page 3 S1 and S2 at depths of 14 and 12 feet, respectively Test results revealed TPH-gasoline concentrations of 2241 mg/kg in sample S1, and 2 1 mg/kg in S2 Test results of a water sample collected from well MW1 sometime between October 29 and November 11, 1986, revealed a TPH-gasoline concentration of 11 58 mg/1 and a benzene concentration of 1 539 mg/f On January 14, 1987, soil samples S-16-1, S-16-2, S-18-3, and S-18-5 were collected during additional excavation of contaminated soil The samples were collected from depths of 16 and 18 feet Test results revealed TPH-gasoline concentrations ranging from 0 8 mg/kg to 596 mg/kg On July 29, 1987, the excavation was reportedly deepened to a depth of approximately 22 feet No record of soil sampling during this excavation is available The excavation was reportedly backfilled with clean imported soil and the contaminated soils stockpiled on- site On January 13, 1988, a representative of AGS visited the site and used a portable soil vapor laboratory to evaluate the lateral extent of hydrocarbon contamination in both the soil and ground water Samples collected during the soil vapor procedure reported no detectable levels of BTEX above a detection level of 2 parts per million (ppm) Results of the soil vapor survey are included in an AGS report dated March 15, 1988 A January 11, 1991 AGS letter to Crystal Creamery reported that a composite sample of the stockpiled soils had been analyzed for TPH-gasoline and BTEX Results of the laboratory tests were below detection levels The stockpiled soils were removed at the request of Crystal Creamery and transported to Holt Dump near Stockton Additional work has been completed at the site by Wallace Kuhl & Associates, Inc (WKA) and is summarized below UVALI.ACC- KUHL H,,U J p"p" r=ASSOCIATES INC