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I29 July 2005 <br /> . AGE-NC Project No 01-0827 <br /> Page 3 of 5 <br /> I2 2 2 Ground Water Sample Collection and Analysis <br /> After allowing wells to achieve a minimum 80%recovery of the pre-purge water volume,a ground <br /> water sample was collected using the disposable bailer The sample was transferred into three <br /> 40-milliliter(ml)EPA-approved volatile organic analysis(VOA)vials and a 1-liter amber container <br /> without preservative The samples were properly labeled, stored in a chilled container, and <br /> transported under chain of custody to Cal Tech Environmental Laboratories (CTEL), a California <br /> Department of Health Services (DHS)-certified analytical laboratory The samples were analyzed <br /> for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, and <br /> • Benzene, toluene, ethylbenzene, and total xylenes (BTEX), and the fuel oxygenated <br /> compounds tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether <br /> (ETBE), tertiary-amyl methyl ether (TAME), methyl tertiary-butyl ether (MTBE), <br /> 1,2-dichloroethane (1,2-DCA), and 1,2-dibromoethane (EDB) by EPA Method 8260 <br /> 3.0. FINDINGS <br /> Ground water flow directions and gradients were inferred from the field data collected on 15 June <br /> 2005 Contaminant impacts to ground water were assessed from the laboratory analysis of the ground <br /> I water samples The DO concentrations and ORP were determined from field data collected on <br /> 15 June 2005 <br /> i3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> On 15 June 2005,depths to ground water in monitoring wells MW-1 through MW-6 and vapor wells <br /> VW-2d and VW-5d ranged from 21 73 fee to 22 39 feet below the tops of the well casings (btoc, <br /> Table 1) The ground water elevations and gradient were calculated and determined from depth to <br /> ground water data from monitoring wells MW-1 through MW-5 The second quarter 2005 ground <br /> water elevations at the site ranged from 1141 feet (MW-4) to 12 26 feet (MW-3) below mean sea <br /> level(MSL) The ground water flow direction at the UST release was inferred to be toward the south <br /> to southeast, at a gradient of approximately 0 003 foot per foot(ft/ft)on-site (Figure 3) <br /> i <br /> Advanced CcoCnvironmcntal,Inc <br />