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r <br /> 41 <br /> 17 July 2000 <br /> AGE-NC Project No 98-0511 <br /> Page 2 of 4 <br /> 2 2 COLLECTION AND LABORATORY 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 and transported under chain-of-custody to McCambell Analytical <br /> Laboratories, Inc , and were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Methods 5030 and 8015m, <br /> • Volatile aromatic hydrocarbons benzene, toluene, ethylbenzene and total xylenes (BTEX) <br /> with methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 602/8020, and <br /> • Fuel oxygenates di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, <br /> tertiary-amyl methyl ether (TAME) and ternary butanol (TBA) in accordance with EPA <br /> Method 8260 Modified <br /> 23 RECEPTOR SURVEY <br /> A search was conducted to locate wells and other sensitive receptors within a 2,000-foot search <br /> radius of the subject property The City of Lathrop was contacted regarding the location of municipal <br /> wells near the subject property The California Department of Water Resources database and the San <br /> Joaquin County Flood Control and Water Conservation District maps were also examined A <br /> door-to-door visual search was performed for the 2,000-foot search radius <br /> 3.0. FINDINGS <br /> Ground water elevation and flow direction were calculated from field data, hydrocarbon-impact to <br /> ground water was Inferred from laboratory analysis of the 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 elevations (Table 1) Depths to ground water ranged from 12 21 feet to <br /> 12 44 feet below the tops of the well casings Ground water elevations at the site ranged from 5 88 <br /> feet in MW-3 to 6 06 in MW-2 relative to mean sea level The ground water gradient was calculated <br /> to be 0 001 ft/ft directed S 890 W <br /> Advanced GeoEnvi ron mental,Inc <br />