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30 October 2003 <br /> AGE-NC Project No 98-0511 <br /> IPage 3 of 5 <br /> I2 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 /> I labeled,placed in a chilled container,transported under cham-of-custody to McCampbell Analytical, <br /> Inc (MAI), 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) in accordance with EPA Method <br /> 8260B, and <br /> a 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 /> 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 17 52 feet to <br /> 18 53 feet below the tops of the well casings Ground water elevations at the site ranged from <br /> 0 04 feet below mean sea level(MSL)in MW-2 to 0 49 feet below MSL in MW-7 The ground water <br /> at the site was inferred to flow generally toward the southwest,varying from southwest to southeast <br /> (Figure 3) The hydraulic gradient was low and vaned from approximately 0 002 ft/f1 to 0 003 ft/ft <br /> 3 2 RESULTS OF GROUND WATER SAMPLE ANALYSIS <br /> TPH-g was detected in the ground water samples collected from MW-I and MW-5 at concentrations <br /> of 300 micrograms per liter (�tg/l) and 890 µg11, respectively BTEX compounds were detected in <br /> I <br /> Advanced GeoEnvironmental,Inc <br /> I <br />