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I <br /> 20 May 1999 <br /> 0 AGE-NC Project No 96-0254 <br /> Page 2 of 4 <br /> 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from each well using a new disposable plastic bailer Each water <br /> sample was transferred into three 40-m1 VOA vials containing 0 5 ml 18% HCI as a sample <br /> preservative and into one 1-liter amber bottle without preservative After collection, the samples <br /> were labeled and placed in a chilled container for transportation under chain-of-custody to <br /> McCampbell Analytical, Inc (MAI), a California Department of Health Services (DHS)-certified <br /> analytical laboratory in Pacheco, California Each sample was analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and TPH-d) by <br /> EPA Method 8015 Modified, <br />' • Volatile aromatic compounds (benzene, toluene, ethylbenzene and total xylenes BTEX) by <br /> EPA Method 8020, with methyl tertiary-butyl ether (MTBE) and <br /> I • Oxygenated fuel additive, di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), <br /> MTBE, tertiary amyl methyl ether (TAME) tertiary butyl alcohol (TBA) by EPA Method <br /> 8260 Modified <br />'• <br /> 3.0. FINDINGS <br />' Ground water elevation and flow direction was inferred from field data fuel-hydrocarbon i a <br /> impact <br /> to ground water was assessed by laboratory analysis <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The depths to ground water from wells MW-1,MW-2, MW-3, MW-5 and MW-6 on-site and MW-3 <br /> from the 2420 Grant Line Road site were measured between 6 88 feet and 7 69 feet below the top <br /> of well casings Between December 1998 and March 1999, ground water elevation increased an <br /> average 0 14 feet at the site <br /> Contours of the ground water elevation data suggest a flow direction toward the north, shifting in <br /> the down-gradient direction toward the north-northeast The ground water gradient on 25 March <br /> I1999 was calculated to be an average of 0 006 or approximately 32 feet/mile across the site and <br /> under Toste Road Ground water elevation data Is illustrated on Figure 3 <br /> I <br /> 0 <br /> I <br /> Advanced GcoEnvironmental Inc <br /> I <br />