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1 <br /> 1 04 January 2002 <br /> AGE-NC Project No. 95-0100 <br />' Page 2 of 4 <br /> 2.2, GROUND WATER SAMPLING <br /> 1 <br /> Following well purging, ground water levels in monitoring wells MW-1 MW-2, MW-3, MW-5 and <br /> 1 MW-6 were allowed to achieve a minimum of 80 percent recharge of the initial casing water level <br /> prior to sample collection. The water level in well MW-4 did not achieve a minimum of 80 percent <br /> recharge of the initial casing water level and was sampled approximately two hours after the well had <br /> been purged. Ground water samples were collected from the purged wells utilizing the dedicated <br /> 1 disposable,polyethylene bailers and three 40-ml volatile organic analysis(VOA)vials containing 0.5 <br /> rnl 18%hydrochloric acid as a sample preservative. Care was taken to ensure that visible air bubbles <br />' were not present'in,the vials after filling and capping. <br /> The samples collected were properly labeled, placed in a chilled container and transported under <br /> chain-of-custddy to McCampbell Analytical,Inc. (MAI), a California Department of Health Services <br /> (DHS)-certified analytical laboratory. <br /> The ground water samples were analyzed for'. <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> lie <br /> Method 8015 Modified; <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br /> 1 (MTBE) in accordance with EPA Method 8020 and <br /> • Oxygenated compounds - di-isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE), <br /> MTBE, tertiary-amyl methyl ether(TAME) and tertiary butanol (TBA), methanol, ethanol, <br /> ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA <br /> Method 8260 Modified. <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 02 November 2001, the contaminant impact to soil and ground water was assessed from the <br /> ' laboratory analytical data obtained from samples collected during the well installation and sampling <br /> events. <br /> 3.1. GROUND WATER ELEVATION/FLOW DIRECTION AND GRADIENT <br /> 1 The depths to ground water in wells MW-1 through MW-6 were measured between 48.31 and 49.37 <br /> feet below the tops of the well,casings and the groundwater elevations were calculated to be between <br /> 66.62 feet and 67.21 feet above mean sea level(msl) on 02 November 2001. Ground water elevation . <br /> Advanced GeoEnvironmental,Inc. <br />