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I22 July 2002 • AGE-NC Project No 99-0592 IPage 2 of 4 opened and water was allowed to run until the pump turned on The samples were transferred into laboratory-supplied 40-m1 EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative and into one 1-liter amber bottle without a sample preservative The sample containers were then labeled with well designation,date,time of sampling and the sampler's initials ' The samples were transported in a chilled container under chain-of-custody to McCampbell Analytical, Inc (MAI), a California Department of Health Services(DHS)-certified laboratory, for analysis The samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in accordance with EPA Method 8015 modified, IBenzene, toluene, ethylbenzene and total xylenes(BTEX) and the oxygenated ether methyl tertiary butyl ether(MTBE) in accordance with EPA Method 8021B, and IThe fuel oxygenates MTBE, di-isoproply ether (DIPE), ethyl tertiary butyl ether(ETBE), tertiarty amyl methyl ether (TAME), tertiary butanol (TBA), methanol, ethanol, and 1,2- dibromoethane (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B 3.0. FINDINGS Ground water elevation, flow direction, and gradient were determined from field data collected on 10 June 2002 Laboratory analysis of ground water samples was used to quantify the impact to ground water 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION 1 Depth to ground water was measured between 59 60 feet and 60 21 feet bsg on 10 June 2002 Ground water elevations at the site ranged from 32 42 feet below mean sea level (MSL) in well MW-I to 33 20 feet below msl in well MW-4 Monitoring data from the site was combined with monitoring well data collected from the adjacent former Cherokee Truck Stop site (3535 East Cherokee Road) also collected on 10 June 2002, to determine the approximate ground water flow direction Ground water elevation data are presented on Table 1 Ground water flow direction was inferred to be toward the northeast at a very low gradient of approximately 0 0001 ft/ft (Figure 3) ' I 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES IThe ground water sample collected from MW-I contained TPH-g and TPH-d at concentrations of 330 micrograms per liter (µg/1) and 210 µg/1, respectively In addition, BTEX compounds were IAdvanced GcoEnVLronmental,Inc I