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1 <br />' 30 April 2003 <br /> • <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 a new, dedicated disposable plastic <br /> bailer Each water sample was transferred into laboratory-supplied 40-m1 VOA vials containing 0 5 <br /> ml 18% hydrochloric acid as a sample preservative After collection, the samples were properly <br />' labeled,placed in a chilled container,transported under chain-of-custody to McCampbell Analytical, <br /> Inc (NW, a California Department of Health Services (DHS)-certified laboratory, and were <br /> analyzed for <br /> I • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 5030/8015M, <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTE&X) and fuel additives, including <br /> methyl tertiary-butyl ether(MTBE),tertiary butanol(TBA),di-isopropyl ether(DIPE),ethyl <br /> tertiary-butyl ether(ETBE),tertiary-amyl methyl ether(TAME), 1,2-dibromoethane(EDB) <br /> and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B <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 /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> The elevation of ground water in 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 13 25 feet to <br /> 14 08 feet below the tops of the well casings Ground water elevations at the site ranged from <br /> 4 02 feet in MW-7 to 4 76 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 south(Figure 3) The hydraulic <br /> gradient was low and vaned from approximately 0 002 ft/ft to 0 006 ft/ft <br /> 3 2 RESULTS OF GROUND WATER SAMPLE ANALYSIS <br /> TPH-g was detected in the ground water samples collected from MW-1 and MW-5 at concentrations <br /> of 11,000 micrograms per liter(gg/1)and 100}Lg/l,respectively BTE&X compounds were detected <br /> . in MW-1 at concentrations of 210 gg/l, 140µg/l,420µg/1 and 2,400 gg/l,respectively Benzene and <br /> Advanced GeoEnvironmental,Inc <br /> I <br />