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05 September 2003 <br /> AGE-NC Project Na. 98-0520 <br /> Page 2 of 4 <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 analytical <br /> laboratory, for analysis. The samples were analyzed for: <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015M; <br /> ' Benzene,toluene,ethyl benzene and xylene(BTE&X),and fuel additives,including methyl <br /> tertiary-butyl ether(MTBE), tertiary butanol (TBA), di-isopropyl ether (RIPE), ethyl telt- <br /> butyl ether(ETBE),tert-amylmethyl ether(TAME), 1,2-dichloroethane(1,2-DCA)and 1,2- <br /> dibromoethane (EDB) in accordance with EPA Method 8260B. <br /> 3.0. FINDINGS <br /> ' Ground water elevation and flow direction were determined from field data collected on 09 rune <br /> 2003. Hydrocarbon-impact to ground waterwas quantified from laboratory analysis of the ground <br /> water samples. <br /> lie <br /> 3.1. GROUND WATER ELEVATION AND GRADIENT <br /> 1 <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 21.64 feet to <br /> ' 22.79 feet below the tops of the well casings(btoc). Ground water elevations at the site ranged from <br /> 14.23 feet (MW-9) to 14.51 feet (MW-10) above mean sea level (MSL). <br /> ' The ground water flow direction was determined using ground water elevation data from water table <br /> wells MW-1 through MW-5 and MW-7 through MW-10. Elevation data from well MW-6 was not <br /> utilized because well MW-6 is a deep-screen well. The ground water table underlying the site was <br /> ' determined to be flowing to the northwest under an average gradient of 0.002 feet/feet. Figure 3 <br /> illustrates the contoured ground water elevations as measured on 09 June 2003. <br /> 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES ' <br /> TPH-g was detected in the water samples collected fromwells MW-1,MW-2, MW-3 and MW-5, <br /> at concentrations ranging from 350 micrograms per liter (µg11) in MW-1 to 3,600 µg/1 in MW-5. <br /> ' Figure 4 illustrates the approximate distribution of dissolved TPH-g. <br /> ' Advanced GeoEnvironmental,Inc. <br /> 1 <br />