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1 <br /> 05 September 2003 <br /> lie <br /> AGE-NC Project No 95-0167 <br /> 1 Page 2 of 4 <br /> ' was transferred into three 40-ml volatile organic analysis (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 Cal Tech Environmental <br /> ' Laboratories (CTEL), a California Department of Health Services (DHS)-certified laboratory, and <br /> were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTE&X) and the fuel additives methyl- <br /> tertiary butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> tertiary-amyl methyl ether(TAME),tertiary butyl alcohol(TBA), 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 flow direction, elevation, and gradient were determined from data collected in the <br /> field The hydrocarbon impact to ground water was quantified by the laboratory data obtained from <br /> the ground water samples <br /> 1 <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br />' For the June 2003 sampling event,depths to ground water ranged from 14 54 feet to 15 33 feet below <br /> the tops of the well casings Ground water elevations at the site ranged from 4 93 feet (MW-5) to <br /> 6 24 feet (MW-2) below mean sea level (MSL) Ground water was within the screened interval of <br /> MW-1 through MW-6, and had an average elevation increase of 0 21 feet since the last monitoring <br /> event <br /> The ground water flow direction was determined by piotting and contouring the ground water <br /> elevation data The shape of the water table at the time of the June 2003 monitoring event was in the <br />' form of a west-northwest-plunging trough Net flow of ground water at the site was determined to <br /> be to the west-northwest under an average gradient of 0 009 feet/feet Figure 3 illustrates the <br /> contoured ground water elevations as measured in June 2003 <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br />' TPH-g was detected in the water samples collected from monitorin <br /> • p g wells MW-1 and MW-2 at <br /> concentrations of 44,000 micrograms per liter(µg/1) and 110 µg/1, respectively <br /> Advanced GeoEnvironmental,Inc <br />