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19 August 2003 <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 /> 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-dichloro ethane (1,2-DCA) and 1,2-dibromoethane (EDB) in 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 /> 31 March 2003, 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 March 2003 sampling event, depths to <br /> ground water ranged from 7 05 feet to 8 25 feet below the tops of the well casings Ground water <br /> elevations at the site ranged from 28 65 feet above mean sea level(MSL)in well MW9 to 29 48 feet <br /> above MSL in well MW11 <br /> The groundwater flow direction was determined by contouring the groundwater elevation data The <br /> ground water at the site was inferred to be flowing to the north-northwest at an average gradient of <br /> I0 005 feet/feet <br /> The ground water contours are depicted on Figure 3 Elevation data from deep-screened well MW6 <br /> I (well-screened interval between 27 and 32 feet bsg) was not used to determine ground water flow <br /> direction <br />