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I25 October 1999 <br /> S AGE-NC Project No 96-0254 <br />' Page 2 of 4 <br /> 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> I <br /> Water samples were collected from each well using a new disposable plastic bailer Each water <br /> sample was transferred into three 40-ml VOA vials containing 0 5 ml 18% HC1 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 /> • Oxygenated fuel additive, di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), <br />' MTBE,tertiary amyl methyl ether(TAME)and tertiary butyl alcohol (TBA)by EPA Method <br /> 8260 Modified <br /> 3.0. FINDINGS <br /> tGround water elevation and flow direction were inferred from field data, fuel-hydrocarbon impact <br /> to ground water was assessed by laboratory analysis <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br />' water from wells MW-1,MW-2 MW-3,MW-5 and MW-6 on-site and MW-3 <br /> The depths to ground , <br /> from the 2420 Grant Line Road site were measured between 6 90 feet and 7 74 feet below the tops <br />' of well casings <br />' Contours of the ground water elevation data suggest a flow direction toward the north, shifting in <br /> the down-gradient direction toward the northeast The ground water gradient on 21 September 1999 <br /> was calculated to be an average of 0 008 under the former UST area and to be approximately 0 0125 <br />' north of the site under Toste Road Ground water elevation data Is illustrated on Figure 3 <br />' 32 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in samples collected from wells MWAA and MW-1B concentrations of 63 <br />' Advanced GeoEnvironmental Inc <br />