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' 04 June 2001 • AGE-NC Project 99-0570 ' Page 2 of 3 ' custody form, stored In a chilled container and transported under chain-of-custody to McCampbell Analytical, Inc (MAI), a California Department of Health(DHS)-certified laboratory, for analysis 22 GROUND WATER ANALYSIS ' Ground water samples were analyzed for the following analytes ' Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in accordance with EPA Method 8015 Modified, Volatile aromatic hydrocarbons-benzene,toluene, ethylbenzene and total xylenes (BTE&X� ' in accordance with EPA Method 8020, and Oxygenated compounds - dr-Isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), ' methyl tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), ethyldrbrormde (EDB) and 1,2-dichloroethane (1,2-DCA) In accordance with EPA Method 8260-Modified, respectively 1• 1 3.0. FINDINGS Ground water elevation, flow direction and gradient were determined from field data collected on 1 08 January 2001, the contaminant impact to ground water was assessed from the laboratory data 1 3 1 GROUND WATER ELEVATION AND GRADIENT The average relative ground water elevation on 08 January 2001 was approximately -10 feet with I an average depth to water of 15 3 feet below well casing grade The top of the ground water table occurred within the screened intervals of the wells Ground water was inferred to be flowing to the north and northeast (Figure 3) with a significant hydraulic gradient of 0 029 feet/feet 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES I TPH- and TPH-d were detected in two of the ground water samples TPH- was detected in well g �' P g samples MW-1 and MW-2 at concentrations of 95 micrograms per liter (gg/1) and 2,700 �rg/l, respectively TPH-d was detected In the same samples at 84 µg/l and 1,600 µg/l, respectively Advanced GeoEtivirournental,Inc