ARCHIVED REPORTS XR0008543 - Laserfiche WebLink

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i i07 February 2005 • AGE-NC Project No 03-1070 iPage 2 of 4 Environmental Laboratories (CTEL) of Paramount, a California Department of Health Services- icertified analytical laboratory, for analysis The samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA iMethod 8015 Modified, • Benzene,toluene,ethylbenzene and total xylenes(BTEX) in accordance with EPA Method 8260B, and • Fuel additives including methyl tertiary-butyl ether(MTBE),di-isopropyl ether(DIPE),ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), i ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B i 3.0. FINDINGS iGround water elevation, flow direction, and gradient were determined from field data collected on 30 August 2004 The contaminant impact to ground water was quantified from the laboratory i - analytical data i3 1 GROUND WATER GRADIENT AND FLOW DIRECTION At the time of the August 2004 sampling event, depths to ground water ranged from 30 90 (MW-2) ifeet to 3145 (MW-1) feet below the tops of the well casings Ground water elevation at the site averaged approximately 20 16 feet below mean sea level (MSL)(Table 1), resulting in an average decrease of 156 feet since the last monitoring event Ground water flow was inferred to be flowing itowards the southeast with an average hydraulic gradient of 0 003 footifoot Figure 3 illustrates the contoured ground water elevations as measured on 30 August 2004 iDuring this monitoring event, the ground water level in wells MW-2 and MW-4 were at least 1 24 feet below the top of the well screens, indicating that the wells are properly screened and i representative of shallow ground water conditions Wells MW-1 and MW-3 were at least 3 71 to 3 55 feet above the tops of the well screen, however, the ground water samples, although collected from"flooded"wells, are representative of shallow ground water conditions because the aquifer is i confined by overlying fine-grained materials and the wells are screened in the first encountered ground water unit i iAdvanced GeoEnvironmentsl,Inc I