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�1 <br />' 30 September 2004 <br /> AGE-NC Project No 96-0254 <br />' Page 2 of 4 <br />' preservative and into one 1-liter amber bottle without a sample preservative After collection, the <br /> samples 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 and analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and TPH-d) in <br />' accordance with EPA Method 8015 Modified <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br />' (MTBE) in accordance with EPA Method 8021 <br /> • Fuel additives, including, di-isopropyl ether (RIPE), ethyl tertiary-butyl ether (ETBE), <br /> MTBE,tertiary-amyl methyl ether(TAME),tertiary-butyl alcohol(TBA), 1,2-dlbromoethane <br />' (EDB) and 1,2-dicholoroethane (1,2-DCA) in accordance with EPA Method 8260B <br />' 3.0. FINDINGS <br />'. Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 19 May 2004 The contaminant Impact to ground water was assessed from the laboratory analytical <br /> data obtained from the sampling event <br /> I <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br />' From the measurements collected on 12 May 2004,the well identifications ofMW-1A,MW-1B and <br /> MW-7 were verified and corrected on the site map (Figure 2) The depth to ground water in May <br /> I2004 ranged between 7 22 feet and 8 01 feet below the tops of the well casings(btoc) The elevation <br /> of ground water in each well was calculated by subtracting the depth to ground water from the <br />' surveyed well casing elevations(Table 1) Ground water elevations could not be calculated for wells <br /> MW-1A,MW-1B,MW-4 and MW-7,which are replacement wells installed in June 2003 that have <br /> not been surveyed yet Utilizing the depth to water measurements from the remaining wells, the <br /> I calculated ground water elevations at the site ranged between 28 93 feet above mean sea level(MSL) <br /> In well MW-2A and 30 06 feet above MSL in well MW-6 <br /> I The ground water flow direction for May 2004 was inferred to be toward the north-northeast at an <br /> average hydraulic gradient of 005 foot/foot(Figure 3) Data from the deeper-screened well MW-2A <br /> was not used to determine the ground water gradient <br /> • <br /> Advanced GeoEnviron mental,Inc <br />