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' 04 June 1999 <br /> AGE-NC Protect No. 97-0351 <br /> Page 2 of 4 <br /> 40-m1 EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml hydrochloric acid <br /> ' (18%) as a sample preservative Additional sample from wells MW-1 and MW-2 was transferred <br /> into chilled 1-liter amber bottles The samples were labeled Individually and placed In a chilled <br /> container and transported under chain-of-custody to McCampbell Analytical, Inc (MAI), a <br /> California Department of Health Services (DHS)-certified analytical laboratory located In Pacheco, <br /> California Each sample was analyzed in accordance with <br /> ' a EPA Method 8015m for total petroleum hydrocarbons quantified as gasoline (TPH-g), <br /> EPA Method 8020 for volatile aromatic compounds (benzene, toluene, ethylbenzene and <br /> ' total xylenes BTEX) and methyl tertiary-butyl ether (MTBE), <br /> • EPA Method 8260m for dl-isopropyl ether(DIPS),ethyl tertiary butyl ether(ETBE),methyl <br /> ' tertiary butyl ether(MTBE),tertiary amyl methyl ether(TAME) and tertiary butyl alcohol <br /> (TBA) <br /> Two water samples from wells MW-1 and MW-2 were also analyzed In accordance with <br /> EPA Method 8015m for total petroleum hydrocarbons quantified as diesel (TPH-d) <br /> ' 3.0. FINDINGS <br /> Ground water flow direction and gradient were determined from field measurements, hydrocarbon <br /> Impact on ground water was assessed from results of laboratory analysis <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The relative elevation of ground water In each well was calculated by subtracting the ground water <br /> depth from the surveyed relative casing elevation The wells were surveyed relative to the top of well <br /> ' MW-1, with an arbitrary elevation of 10 feet above mean sea level The relative ground water <br /> elevation data Is summarized In Table 1 <br /> Ground water flow direction In the area from the western UST was toward the northeast at a gradient <br /> of approximately 0 0016 (ft/ft) or 8 8 feet/mile The overall ground water flow direction at the site <br /> In the area of the western UST was directed toward the northwest <br /> The close proximity of the western UST area to the Stockton Deep Water channel may have a <br /> significant effect on the localized flow and gradient on the site Contoured ground water elevations <br /> Advanced CeoEn,.iron mental,Inc <br />