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i <br /> 15 November 2002 <br /> • AGE-NC Project No 98-0452 <br /> Page 2 of 4 <br /> I2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from each monitoring well using new disposable bailers after allowing <br /> the wells to achieve a minimum 80% recovery of the pre-purge water volume Each water sample <br /> was transferred into laboratory-supplied 40-m1 VOA vials containing 0 5 ml 18%hydrochloric acid <br /> as a sample preservative After collection, the samples were properly labeled, placed in a chilled <br /> container and transported under chain-of-custody to McCambell Analytical Laboratories,Inc (MAI), <br /> a California Department of Health Services(DHS)-certified analytical laboratory, and analyzed for <br /> • TPH-g In accordance with EPA Method 8015 Modified, <br /> • Benzene, toluene, ethylbenzene and xylenes (BTEX) and MTBE in accordance with EPA <br /> Method 8260B, and <br /> + the fuel additives MTBE, tertiary butyl alcohol (TBA), di-isopropyl ether (DIPE), ethyl <br /> tertiary butyl ether (ETBE), and tertiary amyl methyl ether (TAME), methanol, ethanol, <br /> 1,2-dibromoethane (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA <br /> Method 8260B <br /> 3.0. FINDINGS <br /> Ground water elevation and flow direction were calculated from field data, hydrocarbon-impact to <br /> ground water was assessed by laboratory analysis of the ground water samples <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> IThe elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> from the surveyed well head elevations (Table 1) Depths to ground water ranged from 3 93 feet to <br /> 5 03 feet below the tops of the well casings Ground water elevations at the site ranged from <br /> 0 55 feet(MW-3)to 0 82 feet(MW-1)below mean sea level(MSL) The ground water gradient was <br /> calculated to be approximately 0 003 ft/ft with a flow direction toward the southwest (Figure 3) <br /> 32 ANALYTICAL RESULTS OF WATER SAMPLES <br /> TPH-g and BTEX constituents were not detected above laboratory reporting limits in the three <br />' ground water samples analyzed <br /> Advanced CeoEnvtronmental,Inc <br />