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' 13 May 2002 <br /> • AGE-NC Project No 98-0511 <br />' Page 2 of 4 <br />' 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using new disposable plastic bailers Each <br />' water sample was transferred into laboratory-supplied 40-m1 VOA vials containing 0 5 ml 18% <br /> hydrochloric acid as a sample preservative After collection, the samples were properly labeled, <br /> placed in a chilled container, transported under chain-of-custody to Cal Tech Environmental <br />' Laboratories, a California Department of Health Services (DHS)-certified laboratory, and were <br /> 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) and methyl tertiary butyl ether <br /> (MTBE) in accordance with EPA method 8021, and <br /> • Fuel oxygenates, including MTBE,tertiary butanol(TBA), di-isopropyl ether(DIPE), ethyl <br />' tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), ethanol and methanol in <br /> accordance with EPA Method 8260B <br />�i <br /> 3.0. FINDINGS <br />' Ground water elevation and flow direction were determined from field data Hydrocarbon-impact <br /> to ground water was inferred from laboratory analysis of ground water samples <br /> 1 <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> The elevation of ground water in each well was calculated b subtracting the depth to ground water <br /> � Y g P <br /> from the surveyed casing elevations (Table 1) Depths to ground water ranged from 12 59 feet to <br /> 13 45 feet below the tops of the well casings Ground water elevations at the site ranged from <br /> 4 75 feet in MW-6 to 5 26 feet in MW-2 relative to mean sea level The ground water at the site was <br />' inferred to flow generally toward the west, varying from northwest to southwest, the gradient was <br /> low and vaned from approximately 0 003 ft/ft to 0 006 ft/ft (Figure 3) <br />' 3 2 RESULTS OF GROUND WATER SAMPLE ANALYSIS <br />' TPH-g was detected inthe groundwater samples collected from MW-1 and MW-5 at concentrations <br /> • of 8,200 micrograms per liter(}ig/l) and 220 µg/1,respectively BTEX compounds were detected in <br /> 1 Advanced GeoEnvironmental,Inc <br /> 1 <br />