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F <br />' 24 November 2004 <br /> . AGE-NC Project No 03-1070 <br />' Page 2 of 4 1 <br />' Environmental Laboratories (CTEL) of Paramount, a California Department of Health Services- <br /> 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, ethylberizene and total xylenes (BTEX)in accordance with EPA Method <br /> 8260B, and <br /> • Fuel additives including methyl tertiary-butyl ether(MTBE),di-isopropyl ether(DIPE),ethyl <br /> tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), <br /> ethylene dibromide (EDB) and 1,2-dichloro ethane (1,2-DCA) in accordance with EPA <br /> Method 8260B <br /> 1 � , <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br />� . 28 June 2004 The contaminant impact to groundwater was quantified from the laboratory analytical <br /> data <br />' 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br />' At the time of the June 2004 sampling event,depths to ground water ranged from 29 32(MW-2)feet <br /> to 29 85 (MW-1)feet below the tops of the well casings Ground water elevation at the site averaged <br /> approximately 18 60 feet below mean sea level(MSL)(Table 1),resulting in an average decrease of <br />' 0 59 feet since the last monitoring event Ground water flow was inferred to be flowing towards the <br /> southeast with an average hydraulic gradient of 0 005 feet/feet Figure 3 illustrates the contoured <br /> ground water elevations as measured on 28 June 2004 <br />' Duringthis monitoring event the ground water level in well MW-2 was 4 32 feet below the top of <br /> g <br /> the well screen, indicating that the well is properly screened and representative of shallow ground <br />' water conditions Wells MW-1, MW-3 and MW-4 were at least 0 24 to 5 30 feet above the tops of <br /> the well screen, however, the ground water samples, although collected from "flooded" wells, are <br /> representative of shallow ground water conditions because the aquifer is confined by overlying fine <br /> grained materials and the wells are screened in the first encountered ground water unit <br />' Advanced GeoEnvironmental,Inc <br />