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' 22 February 2002 <br /> • AGE-NC Project No. 95-0100 <br /> Page 2 of 4 <br /> 2.2. GROUND WATER SAMPLING <br />' Following well purging,ground water levels in monitoring wells MW-1,MW-2,MW-3,MW-5 and <br /> MW-6 were allowed to achieve a minimum of 80 percent recharge of the initial casing water level <br />' prior to sample collection. Ground water samples were collected from the purged wells utilizing the <br /> dedicated disposable, polyethylene bailers and three 40-m1 volatile organic analysis (VOA) vials <br /> containing 0.5 ml 18% hydrochloric acid as a sample preservative. Care was taken to ensure that <br />' visible air bubbles 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-custody 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 /> Method 8015 Modified; <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br />' • (MTBE) in accordance with EPA Method 8020 and <br /> • Oxygenated compounds - di-isopropyl ether (DIPE), 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-dichloro ethane (1,2-DCA) in accordance with EPA <br /> Method 8260 Modified. <br /> 1 <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> ' 30 January 2002,the contaminant impact to soil and ground water was assessed from the laboratory <br /> analytical data obtained from samples collected during the well installation and sampling events. <br /> 3.1. GROUND WATER ELEVATION/FLOW DIRECTION AND GRADIENT <br /> .-.—...The depths to.ground water in wells MW-1_through MW-6 were measured.between 4.9.04 and 50.03 <br /> feet below the tops of the well casings and the groundwater elevations were calculated to be between <br /> 65.88 feet and 66.42 feet above mean sea level (msl) in the same wells. <br /> 1 <br /> ' Advanced GeoEnvironmental,Inc. <br />