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15 December 2005 <br /> w AGE-NC Project No 03-1070 <br />' Page 2 of 4 <br />' samples were properly labeled,placed in a chilled container and transported under chain of custody <br /> to Cal Tech Environmental Laboratories (CTEL) of Paramount, a California Department of Health <br /> Services-certified analytical laboratory, for analysis The samples were analyzed for <br />' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, <br /> • Benzene,toluene, ethylbenzene and total xylenes(BTEX) in accordance with EPA Method <br /> 8260B, and <br />' • Fuel additives including methyl tertiary-butyl ether(MTBE),di-isopropyl ether(DIPS),ethyl <br /> tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), <br /> ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) 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 /> 23 August 2005 The contaminant impact to ground water was quantified from the laboratory <br /> analytical data <br /> 1 <br /> 31 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> At the time of the August 2005 sampling event, depths to ground water ranged from 28 48 (MW-2) <br /> feet to 28 99(MW-1)feet below the tops of the well casings(Table 1) The ground water elevations <br />' calculated from the depth to water measurements averaged approximately 17 77 feet below mean <br /> sea level (MSL) The net ground water flow was inferred to be towards the southeast at a calculated <br /> hydraulic gradient ranging between 0 005 foot per foot(ft/ft) and 0 008 ft/ft Figure 3 illustrates the <br />' contoured ground water elevations as measured on 23 August 2005 <br /> During this monitoring event, the ground water level in well MW-2 was 3 58 feet below the top of <br />' the well screen, indicating that the well is properly screened and representative of shallow ground <br /> water conditions Wells MW-I/MW-3 and MW-4 were at 6 feet and 1 feet, respectively, above the <br />' tops of the well screens, however, the ground water samples, although collected from "flooded" <br /> wells, are representative of shallow ground water conditions because the aquifer is confined by <br /> overlying fine-grained materials and the wells are screened in the first encountered ground water <br />' unit <br /> • <br /> Advanced GeoEnv►ronmental,Inc <br /> 1 <br />