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' 05 June 2003 AGE-NC Project No. 98-0520 Page 2 of 4 ' Laboratories (CTEL), a California Department of Health Services (DHS)-certified analytical laboratory, for analysis. The samples were analyzed for: • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015M; • Benzene,toluene, ethyl benzene and xylene(BTE&X),and fuel additives,including methyl ' tertiary- butyl ether(MTBE), tertiary butanol (TBA), di-isopropyl ether (RIPE), ethyl tert- butyl ether(ETBE),tert-amyl methyl ether(TAME), 1,2-dichloroethane(1,2-DCA)and 1,2- dibromoethane (EDB) in accordance with EPA Method 8260B. ' 2.3. EXTRACTED GROUND WATER DISPOSAL On 15 January 2003, the ground water purged during prior ground water monitoring was pumped ' from the storage drums into a vacuum truck (supplied by American Valley Waste Oil); approximately 330 gallons of purged water was transported 'off--site under a hazardous waste manifest to Seaport Environmental, a waste treatment facility located in Redwood City, California. Documentation and uniform hazardous waste manifests for disposal of the purged water is contained . in Appendix C. 3.0. FINDINGS Ground water elevation and flow direction were determined from field data. Hydrocarbon-impact to ground water was quantified from laboratory analysis of the ground water samples. 3.1. GROUND WATER ELEVATION AND GRADIENT �. The elevation of ground water in each well was calculated by subtracting the depth to ground water from the surveyed casing elevations (Table 1). Depths to ground water ranged from 19.67 feet to ' 20.81 feet below the tops of the well casings(btoc). Ground water elevations at the site ranged from 16.20 feet (MW-8) to 16.44 feet(MW-10) above mean sea level (MSL). ' The ground water flow direction was determined using ground water elevation data from water table wells MW-1 through MW-5 and MW-7 through MW-10. Elevation data from well MW-6 was not utilized because well MW-6 is a deep-screen well. The ground water table underlying the site is ' inferred to be flowing northwest under an average gradient of 0.001 ft/ft. Figure 3 illustrates the contoured ground water elevations as measured on 18 March 2003. Advanced GcoEnvironmentat,Inc.