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' 10 February 2005 <br /> AGE-NC Project No 96-0263 <br />' Page 2 of 4 <br />' After collection, the samples were properly labeled, placed in a chilled container and transported <br /> under chain of custody to Cal Tech Environmental Laboratories (CTEL), a State of 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 5030/8015 Modified, and <br /> • Benzene,toluene, ethylbenzene and total xylenes(BTEX), fuel additives di-isopropyl ether <br /> (DIPE),ethyl tertiary-butyl ether(ETBE),methyl-tertiary-butyl ether(MTBE),tertiary-amyl <br />' methyl ether (TAME), tertiary butanol (TBA), 1,2-dichloroethane (1,2-DCA) and 1,2- <br /> dlbrom.oethane (EDB) in accordance with EPA Method 8260B <br /> r <br /> 3.0. FINDINGS <br />' Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 28 August 2004, 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 August 2004 sampling event, depths to <br /> ground water ranged from 7 18 feet to 8 31 feet below the tops of the well casings Ground water <br /> elevations at the site ranged from 28 60 feet above mean sea level(MSL)in well MW-9 to 29 42 feet <br /> 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 /> 0 005 foot/foot The ground water contours are depicted on Figure 3 Elevation data from deep- <br /> screened well MW-6(screened between 27 and 32 feet bsg)was not used to determine ground water <br /> flow direction <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in water samples MW-2,MW-5 and MW-7 at concentrations ranging from 330 <br /> micrograms per liter(µg/1) in MW-5 to 44,000 µg/1 In MW-7 <br /> Advanced GeoEnvironmental,Inc <br /> I <br />