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i r30 December 2005 AGE-NC Project No 00-0764 Page 2 of 4 volatile organic analysis(VOA)vials containing 0 5 ml 18%hydrochloric acid solution as a sample preservative, and into one 1-liter amber bottle without preservative The samples were properly labeled, placed in a chilled container, and transported under chain of custody to Cal Tech Environmental Laboratories (CTEL), a California Department of Health Services (DHS)-certified analytical laboratory located in Paramount, California Each sample was ' analyzed for Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in accordance with EPA method 8015M, and • Benzene, toluene, ethylbenzene, and total xylenes (BTEX), the fuel additives di-isopropyl ether(DIPE),ethyl tertiary-butyl ether(ETBE),methyl-tertiary butyl ether(MTBE),tertiary- amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), methanol, and ethanol, lead scavengers 1,2-dichloroethane(1,2-DCA)and 1,2-dibromoethane(EDB),and trichloroethene (TCE), tetrachloroethene (PCE), and naphthalene in accordance with EPA Method 8260B . 3.0. FINDINGS Ground water elevation,flow direction,and gradient were determined from field data collected from ' shallow-screened wells MW-1 through MW-4 on 26 August 2005,the contaminant impact to ground water was quantified from the ground water laboratory data 3 1 GROUND WATER ELEVATION AND GRADIENT Depths to ground water ranged from 30 47 feet to 31 79 feet below the tops of the well casings Ground water was within the screened intervals of wells MW-1 through MW-4, indicating that the wells should yield samples fully representative of shallow ground water conditions,well MW-5 was screened at approximately 32 feet below the water table and should yield water samples representative of deeper ground water conditions The elevation of ground water in each well was calculated by subtracting the ground water depth from the surveyed casing elevation Ground water elevations in the shallow wells ranged from 19 24 feet (MW-1) to 19 39 feet (MW-4) below mean sea level (MSL), the elevation of deeper screened well MW-5 was 19 84 feet below MSL The ground water elevation data is summarized in Table 1 Ground water flow direction of first encountered ground water,in the area of the former USTs,was • ' Advanced GeoEnvironmental,Inc