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1 ' <br /> 02 April 2002 <br /> • AGE-NC Project No 95-0142 <br />' Page 2 of 4 <br /> 3 ' <br />' 2 2 GROUND WATER SAMPLE COLLECTION <br />' After allowing the monitoring wells to achieve a minimum of 80%recovery of the pre-purge water <br /> volume,water samples were collected from each well using the dedicated polyethylene bailers The <br /> water was then transferred into EPA-approved 40-milliliter (ml) VOA vials containing 0 5 ml <br />' hydrochloric acid(18%)as a sample preservative The vials were then labeled and placed in a chilled <br /> container for subsequent transport under chain-of-custody to McCampbell Analytical, Inc (MAI) <br /> a State of California Department of Health Services (DHS) certified laboratory Ground water <br /> tsamples were analyzed for the following <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)in accordance with EPA Method <br /> 8020, and <br /> • Oxygenated fuel additives - di-isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE), <br /> methyl tertiary-butyl ether(MTBE),tertiary-amyl methyl ether(TAME)and tertiary butanol <br /> • (TBA),methanol,ethanol, ethylene dibromide(EDB) and 1,2-dichloroethane(1,2-DCA)in <br /> accordance with EPA Method 8260, respectively <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 28 January 2002, the contaminant impact to ground water was quantified by the ground water <br /> 1 laboratory data <br /> 3 1 GROUND WATER GRADIENT AND DIRECTION <br /> Depth to ground water at the site ranged from 26 16 feet to 27 44 feet below the tops of the well <br /> casings The ground water elevation in the wells ranged from 14 13 feet to 14 76 feet below mean <br /> sea level (msl) The average ground water elevation increased approximately 1 1 feet since the <br /> previous monitoring event The elevation and ground water depth data is depicted in Table 1 <br /> During the January 2002 monitoring event,ground water flow direction in the shallow ground water <br />' table(vapor wells)was toward the northwest with an average hydraulic gradient of 0 0l feet/feet or <br /> 53 feet/mile, ground water flow direction in the intermediate monitored water zone (wells MW-1, <br /> . MW-2 and MW-3 ) was toward the northeast with an average hydraulic gradient of 0 005 feet/feet, <br />