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06 August 2002 <br /> AGE-NC Project No 95-0104 <br /> Page 2 of 4 <br /> sample preservative and into one 1-liter amber bottle without added preservative The samples were <br /> properly labeled, placed in a chilled container and transported under chain-of-custody to <br /> McCampbell Analytical, Inc (MAI) a State of California Department of Health Services <br /> (DHS)-certified analytical laboratory The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> Iaccordance with EPA Methods 50301355018015-Modified, <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br /> (MTBE) in accordance with EPA Method 8020, and <br /> • Fuel additives MTBE, dl-isopropyl ether (DIPE), ethyl ternary-butyl ether (ETBE), <br /> tertiary-amyl methyl ether(TAME), tertiary butanol (TBA), 1,2-dichloro ethane(1,2-DCA) <br /> and ethylene dibromide (EDB) in accordance with EPA Method 8260B <br /> 3.0 FINDINGS <br /> lieGround water elevation, flow direction, and gradient were determined from field data collected on <br /> 26 June 2002,the contaminant impact to ground water was quantified from the laboratory analytical <br /> data obtained from the sampling event <br /> E <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The elevation of ground water in each well was calculated b subtracting the depth to ground water <br /> �' Y g p <br /> from the surveyed well casing elevations (Table 1) <br /> The depth to ground water ranged from 66 34 feet to 67 32 feet below the tops of the well casings <br /> Ground water elevations at the site ranged from 32 45 feet above mean sea level (MSL) in wells <br /> MW-3 and MW-5 to 32 68 feet above MSL in well VW-1 Ground water elevations at the site <br /> decreased an average of 2 70 feet between the January 2002 and June 2002 sampling events <br /> The ground water flow direction on 26 June 2002 was inferred to be towards the northeast under an <br /> average gradient of 0 003 feet/feet Figure 3 illustrates the contoured ground water elevations <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> 1,2-DCA was detected in the water samples collected from MW-5, MW-6 and VW-1 at <br /> . concentrations of 42 µg/1,2 0 µg/1 and 6 7µg/1,respectively TPH-g,BTEX and other fuel additives <br /> Advanced Gen Environ mental,Inc <br />