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Quik Stop Market No 76 October 28,2003 <br /> Stockton,California Results of Additional Groundwater Investigation <br /> with plastic Four representative samples were collected from the soil stockpile after <br /> • <br /> completion of drilling <br /> g <br /> Thirteen soil samples were collected from the soil boring No subjective evidence of <br /> petroleum hydrocarbon impacts or positive PID readings were noted during field screening <br /> of the soil samples Groundwater was encountered at approximately 67 feet bsg <br /> Monitoring well MW-1 was constructed using 2-inch inside diameter, PVC casing and <br /> 0 020-inch machine slotted casing The screened interval was set at 55 feet to 75 feet bsg <br /> Filter pack sand bentonite and sanitary seal were set as shown on the boring log During <br /> placement of the sanitary seal, grout inadvertently entered the well casing <br /> The soil samples were submitted, under chain-of-custody (COC) documentation, to Kiff <br /> Analytical LLC (Kiff), a California Department of Health Services-certified analytical <br /> laboratory (ELAP No 2236) located in Davis, California The 20, 45, 60, 70, and 75-foot <br /> soil samples and the soil stockpile composite sample were analyzed for TPHg, BTEX, and <br /> methyl-t-butyl ether (MTBE) by Environmental Protection Agency (EPA) Method 8260B <br /> The soil stockpile composite sample was also analyzed for total lead by EPA Method <br /> 6010B Soil analytical data are summarized in Table 1 Analytical reports are contained in <br /> Appendix D <br /> On July 11, 2003 Horizon developed and sampled monitoring well MW-1 Measurement of <br /> total well depth indicated that the bottom 5 feet of well casing was cemented in The lower <br /> 5 feet of open screen is below the water table and allowed formation water to enter Water <br /> generated from development and purge operations was temporarily stored on site in labeled <br /> 55-gallon Department of Transportation (DOT) approved drums The monitoring well field <br /> data sheet is contained in Appendix E The groundwater sample collected from monitoring <br /> well MW-1 was submitted, under COC documentation, to Kiff and analyzed for TPHg, <br /> BTEX, and the fuel additives MTBE, diisopropyl ether (DIPE), ethyl-t-butyl ether (ETBE), <br /> tert-amyl methyl ether (TAME), tert-butanol (TBA), 1,2-dichloroethane (DCA) and 1,2- <br /> 076AddGWtnvestgtn10-03 doe 4 <br /> Project No 7079 14 HORIZON ENVIRONMENTAL <br />