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• 20 July 2000 <br /> AGE-NC Project No 95-0109 <br />' Page 2 of 4 <br />' 2 2 COLLECTION OF GROUND WATER SAMPLES <br /> _- The depth to water was remeasured after purging to ensure a minimum of 80 per cent recharge prior <br />' to sampling Water samples were collected from each purged well using disposable plastic bailers <br /> Immediately upon retrieval, the samples were transferred into 40-m1 EPA-approved VOA vials <br /> containing 0 5ml 18%hydrochloric acid as a sample preservative The samples were labeled, stored <br />' on ice, and transported in a chilled container, under chain-of-custody, to McCampbell Analytical, <br /> Inc (MAI), a State of California Department of Health Services (DHS)-certified analytical <br /> laboratory All samples were analyzed for <br />' carbons quantified as gasoline TPH- in accordance with EPA <br /> Total petroleum hydra q g ( g) <br /> Methods 5030/8015M, <br /> • Volatile aromatic compounds - benzene, toluene, ethylbenzene and xylenes (BTEX) and <br /> methyl tertiary-butyl ether (MTBE) in accordance with EPA method 8020/602, <br />' Fuel additives -'di-isopropyl ether(RIPE), ethyl tertiary-butyl ether(ETBE),MTBE,tertiary- <br /> amyl methyl ether (TAME), tertiary butanol (TBA), ethylene dibromide (EDB) and <br /> 1• 1,2-dxchloroethane (1,2-DCA) in accordance with EPA Method 8260M <br />'i 3.0. FINDINGS <br />' Ground water elevation and flow direction were inferred from field data collected on 28 June 2001 <br /> The hydrocarbon-impact to'ground water was assessed from laboratory analysis of the ground water <br /> samples <br /> 3 1 GROUND WATER GRADIENT AND DIRECTION <br /> 1 The elevation of'ground water m each well was calculated b subtracting the depth to ground water <br /> gr Y g p <br /> from the surveyed well casing`elevations (Table 1) 1 <br /> The depth to ground water ranged from 52 18 feet to 55 14 feet below the tops of the well casings <br /> Ground water elevations at the site ranged from 178 feet below mean sea level (MSL) in well <br />' MW-13 to 1 18 feet above MSL in well MW-2 Ground water elevations at the site decreased an <br /> average of 166 feet between the March 2001 and June 2001 sampling events Ground water levels <br /> were within the screened intervals of all the wells sampled <br /> The ground water flow direction is inferred to be towards the west-southwest on-site and,#oward the <br /> Advanced GeoEnviranmental,Inc <br />