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30 June 2004 <br /> AGE-NC Project No 01-0839 <br /> IPage 2 of 4 <br /> I 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 California Department <br /> of Health Services-certified analytical laboratory, for analysis The samples were analyzed for <br /> I0 Total petroleum hydrocarbons as gasoline(TPH-g)in accordance with EPA Method 8015M, <br /> and <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX), di-isopropyl ether(DIPE), ethyl <br /> tertiary-butyl ether(ETBE),methyl tertiary-butyl ether(MTBE),tertiary-amyl methyl ether <br /> (TAME), tertiary-butyl alcohol (TBA),ethylene dibromide (EDB) and 1,2 dichloroethane <br /> (1.,2-DCA) by EPA Method 8260B <br /> I3.0. FINDINGS <br /> I The ground water elevation, flow direction, and gradient were determined from field data The <br /> contaminant impact to ground water was quantified by the laboratory analytical data <br /> I• 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> I At the time of the March 2004 sampling event, depths to ground water ranged from 67 15 feet to <br /> 67 46 feet below the tops of the well casings (Table 1), ground water elevations at the site ranged <br /> from 33 53 feet(MW-3)to 33 63 feet(MW-1)below mean sea level(MSL) During this monitoring <br /> event,the ground water level was within the screened interval of the wells, indicating that the wells <br /> were properly screened to yield representative shallow ground water samples <br /> The ground water flow direction was calculated from the well elevation data The net ground water <br /> flow direction was inferred to be towards the north to northeast at a gradient of 0 001 ft/ft(Figure 3) <br /> 1 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> ITPH-g was detected in the water samples collected from wells MW-3 and MW-4 at concentrations <br /> of 200 micrograms per liter(pg/l) and 1,700 }ig/l, respectively <br /> MTBE was detected in the water samples collected from wells MW-3 and MW4 at concentrations <br /> of 200 µg/1 and 1,700 µg/l, respectively <br /> The fuel additive 1,2-DCA was detected in water samples from wells MW-2, MW-3 and MW-4 at <br /> . a maximum concentration of 5 9 gg/1 (MW-3) <br /> IAdvanced GeoEnvtronmental,Inc <br />