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I11 November 2002 <br /> . AGE-NC Project No 96-0263 <br /> Page 2 of 4 <br />' sample was transferred into three 40-m1 VOA vials containing 0 5 ml 18% hydrochloric acid as a <br /> sample preservative After collection, the samples were properly labeled, placed in a chilled <br /> container and transported under chain-of-custody to Cal Tech Environmental Laboratories(CTEL), <br /> a State of California Department of Health Services (DHS)-certified analytical laboratory The <br /> samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> I Method 5030/8015 Modified, <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) in accordance with EPA Method <br /> 8260B, and <br /> • Fuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether(ETBE), methyl <br /> tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), <br /> 1,2-dichloroethane (1,2-DCA) and ethylene dibromide (EDB) 1n accordance with EPA <br /> Method 8260B <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 26 September 2002, the contaminant impact to ground water was quantified from the laboratory <br /> analytical data <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> The elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> from the surveyed well casing elevations (Table 1) For the September 2002 sampling event,depths <br /> to ground water ranged from 6 97 feet to 8 10 feet below the tops of the well casings Ground water <br /> elevations at the site ranged from 28 78 feet above mean sea level (MSL) in well MW 10 to 29 65 <br /> feet above MSL in well MW 11 <br /> The ground water flow direction was determined by contouring the ground water elevation data The <br /> ground water at the site was inferred to be flowing to the north-northwest at an average gradient of <br /> 0 006 feet/feet or 26 feet per mile <br /> The groundwater contours are depicted on Figure 3 Elevation data from deep-screened well MW-6 <br /> (well-screened interval between 27 and 32 feet bsg) was not used to determine ground water flow <br /> direction <br /> I <br />