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28 March 2002 <br /> . AGE-NC Project No 95-0104 <br /> Page 2 of 3 <br /> as a sample preservative and into one 1-liter amber bottle without added preservative The samples <br /> were 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 /> I (DHS)-certified analytical laboratory The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Methods 50301355018015-Modified, <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br /> I (MTBE) in accordance with EPA Method 8020, and <br /> • Fuel additives MTBE, di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> tertiary-amyl methyl ether(TAME), tertiary butanol (TBA), 1,2-dichloroethane(1,2-DCA) <br />' and ethylene dibromide (EDB) in accordance with EPA Method 8260M <br /> 3.0. FINDINGS <br /> . Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 30 January 2002, the contaminant impact to ground water was quantified from the laboratory <br /> analytical data obtained from the sampling event <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <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) <br />' The depth to ground water ranged from 63 64 feet to 64 50 feet below the tops of the well casings <br /> Ground water elevations at the site ranged from 35 13 feet above mean sea level (MSL) in well <br />' MW-5 to 35 37 feet above MSL in well VW-1 Ground water elevations at the site increased an <br /> average of 1 37 feet between the December 2001 and January 2002 sampling events <br />' The ground water flow direction is inferred to vary towards the east to the northeast under a varying <br /> gradient of 0 002 and 0 003 feet/feet Figure 3 illustrates the contoured ground water elevations <br /> 1 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br />' TPH-g was detected 1n the water sample collected from MW-1 at a concentration of 59 µg11 <br /> • 1,2-DCA was detected in the water samples collected from MW-1, MW-5, MW-6 and VW-1 at <br /> Advanced GeoEnvironmentaf,Inc <br />