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I ' 08 March 1999 AGE-NC Protect No 96-0254 ' Page 2 of 4 ' 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Water samples were collected from each well using a new disposable plastic bailer Each water ' sample was transferred into three 40-m1 VOA vials and one 1-liter amber bottle After collection, the samples were labeled and placed in a chilled container for transportation under chain-of-custody to McCampbell Analytical, Inc (MAI),a California Department of Health Services (DHS)-certified ' analytical laboratory in Pacheco, California Each sample was analyzed for • Total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and TPH-d) by ' EPA Method 8015 Modified, • Volatile aromatic compounds (benzene, toluene, ethylbenzene and total xylenes BTEX) by ' EPA Method 8020, with methyl tertiary-butyl ether(MTBE) and • Oxygenated fuel additive, di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), ' MTBE, tertiary amyl methyl ether (TAME) tertiary butyl alcohol (TBA) by EPA Method 8260 Modified 10 3.0. FINDINGS Ground water was inferred to be flowing toward the north and minor hydrocarbon concentrations were detected in ground water samples collected from one dual-completed monitoring well 3 1 GROUND WATER ELEVATION AND GRADIENT The depths to ground water from wells MW-1, MW-2, MW-3, MW-5, MW-6 and MW-3 from the Grant Line site were measured between 6 86 feet and 8 73 feet below the top of well casings Between September and December 1998, ground water elevation decreased an average 0 02 feet at the site IContours of the ground water elevation data suggest a flow direction toward the north, shifting down-gradient toward the north-northeast The ground water gradient on 17 December 1998 was calculated to be an average of 0 006 or approximately 32 feet/mile across the site and under Toste Road Ground water elevation data is illustrated on Figure 3 0 Advanced GeoEnvironmental Inc