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Y ! ' 22 August 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 ' 2 2 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 (BTEX) in accordance with EPA Method 8020, and • Oxygenated compounds - di-Isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), methyl tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), ethyldibromide(EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260-Modified, respectively 3.0. FxNDINGS Ground water elevation, flow direction and gradient were determined from field data collected on 31 May 2001, the contaminant impact to ground water was assessed from the laboratory data I3 1 GROUND WATER ELEVATION AND GRADIENT The average relative ground water elevation on 31 May 2001 was approximately seven to rune below sea level, with an average depth to water of thirteen to fifteen 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 02 feet/feet to a low gradient of 0 008 feet/feet north of well MW-2 I3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-g and TPH-d were detected in two of the ground water samples TPH-g was detected in well ' samples MW-1 and MW-2 at concentrations of 76 micrograms per liter (µg/1) and 910 µg/1, • respectively TPH-d was detected in the same samples at 150 µg/1 and 750µg/l, respectively Advanced GeoEnvironmentai,Inc.