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1 <br />' 05 August 1999 <br /> . AGE-NC Project No. 96-0254 <br /> Page 2 of 4 <br /> 1 <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% HCl 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 Iaboratory 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 (DIPS), ethyl tertiary butyl ether (ETBE), <br />' MTBE, tertiary amyl methyl ether (TAME) tertiary butyl alcohol (TBA) by EPA Method <br /> 8260 Modified <br /> I� <br /> 30. FINDINGS <br />' Ground water elevation and flow direction Nvere inferred from field data, fuel-hydrocarbon impact <br /> to ground water was assessed by laboratory analysis <br /> I <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> IThe 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 7 00 feet and 8 80 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 /> Ithe down-gradient direction tovvard the northeast The ground water gradient on 21 June 1999 was <br /> calculated to be an average of 0 0086 under the former UST area and was also calculated to be 0 005 <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 MW-1A, MW-1B and MW-2A at <br /> I <br /> Adtivnced CeoEm ironmenial Inc <br />