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1 <br /> r <br /> Following purging, groundwater samples were collected from each of the eight groundwater wells using a <br /> new polyethylene disposable bailer Groundwater samples from each well were placed in four 40- <br /> milliliter VOA vials supplied by Columbia Analytical Services (CAS), a California State certified <br /> analytical laboratory located in Santa Clara, California Following collection, the groundwater samples <br /> were placed in an ice cooler and transported, under proper chain-of-custody record, to CAS for analysis <br /> Each groundwater sample was analyzed for Total Purgeable Petroleum Hydrocarbons as Gasoline <br /> (TPPH-G) according to Environmental Protection Agency (EPA) Method 8015 Modified, and benzene, <br /> toluene, ethylbenzene, total xylenes (BTEX), methyl tert-butyl ether (MTBE), tert-Butyl Alcohol (TBA), <br /> Diisopropyl Ether (DIPE), Ethyl tert-Butyl Ether(ETBE), and tert-Amyl Methyl Ether (TAME) according <br /> to EPA Method 8260 <br /> 2.3 March 24 1999 Groundwater Analytical Results <br /> ILaboratory analytical results from the March 1999 groundwater sampling event indicated that <br /> groundwater samples from monitor wells MW-4 and MW-7 contained TPH-G at concentrations of 630 <br /> and 75 micrograms per liter (ug/L), respectively Currently, there is not an established California <br /> Department of Health Services(CDHS) corrective action level for TPPH-G in groundwater Groundwater <br /> collected from the other monitor wells did not contain detectable concentrations of TPH-G <br /> Benzene was detected above the CDHS contaminant levels for drinking water standards (1 ug/L) in <br /> groundwater samples collected from morutorzng wells MW-2, MW-3, MW-4 and MW-6 The <br /> approximate lateral extent of benzene concentrations above 1 ug/L for the March 24, 1999 sampling event <br /> is presented on Figure 3 <br /> Toluene, ethylbenzene, and total xylenes were not detected above the CDHS HS standards in the samples <br /> collected from the eight existing groundwater monitoring wells MTBE, TBA, DIPS, ETBE, and TAME <br /> were not detected above laboratory method reporting limits in groundwater samples from the eight <br /> r monitoring wells and trip blank sample Blaes Environmental notes that 1,2-Dzchloroethane was found at <br /> Ea concentration of 140 ug/1 in groundwater monitoring well MW-7 The origin and extent of the <br /> compound is unknown <br /> 1 <br /> 3 <br /> I <br />