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' 31 October 2003 <br /> AGE-NC Project No 98-0511 <br />' Page 3 of 4 <br />' 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using a new, dedicated disposable plastic <br />' bailer Each water sample was transferred into laboratory-supplied 40-m1 volatile organic analysis <br /> (VOA)vials containing 0 5 ml 18%hydrochloric acid as a sample preservative After collection,the <br />' samples were properly labeled, placed in a chilled container, transported under chain-of-custody to <br /> McCampbell Analytical, Inc (MAI), a California Department of Health Services (DHS)-certified <br /> laboratory, and were analyzed for <br />' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 5030/8015M, <br />' • Benzene, toluene, ethylbenzene and total xylenes(BTEX) in accordance with EPA Method <br /> 802113, and <br /> Fuel additives, including methyl tertiary-butyl ether (MTBE), tertiary butanol (TBA), di- <br /> isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether <br /> (TAME), 1,2-dibromoethane (EDB)and 1,2-dichloroethane(1,2-DCA)in accordance with <br /> EPA Method 8260B <br /> 1 30. FINDINGS <br /> Ground water elevation and flow direction were determined from field data The petroleum <br /> ihydrocarbon-impact to ground waterwas inferred from laboratory analysis of ground water samples <br />' 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> 1 The elevation of ground water III each well was calculated by subtracting the depth to ground water <br /> from the surveyed casing elevation (Table 1) Depths to ground water ranged from 15 95 feet to <br /> 16 63 feet below the tops of the well casings Ground water elevations at the site ranged from <br /> 140 feet in well MW-7 to 1 88 feet in well MW-2 relative to mean sea level The ground water at <br /> the site was inferred to flow generally toward the west, varying from northwest to south(Figure 3) <br /> The hydraulic gradient was low and vaned from approximately 0 002 ft/ft to 0 006 ft/ft <br /> 32 RESULTS OF GROUND WATER SAMPLE ANALYSIS <br /> TPH-g was detected in the ground water samples collected from wells MW-1 and MW-5 at <br /> concentrations of 1,600 micrograms per liter(�ig/l) and 2,000 }tg/l,respectively BTEX compounds <br /> 1 Advanced GeoEnviroomental,Inc <br />