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03 January 2005 AGE-NC Project No. 01-0815 Page 2 of 4 • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015M; and 0 Benzene, toluene, ethylbenzene, and total xylenes (BTEX) and the fuel additives methyl tertiary-butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether(TAME),tertiary butanol(TBA),ethylene dibromide(EDB),and 1,2-di chloro ethane (1,2-DCA) in accordance with EPA Method 826013. 2.3. PURGE WATER DISPOSAL On 22 October 2004,American Valley Waste Oil, Inc. of Dclhi, California pumped approximately 100 gallons of purge water from drums on-site.A copy of the non-hazardous waste manifest can be found in Appendix C. ` 3.0. FINDINGS Ground 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 F analytical data. 3.1. GROUND WATER GRADIENT AND FLOW DIRECTION At the time of the August 2004 sampling event, depths to ground water ranged from 31.54 feet (MW-2)to 32.15 feet(MW-3)below the tops of the well casings. Ground water elevation averaged �. approximately 20.83 feet below mean sea level (MSL), a decrease of 1.47 feet since the last monitoring event in June 2004 (Table 1). During this monitoring event, the ground water levels in the wells were at least 7.15 feet below the tops of the well screens, indicating that the wells are +-• screened properly to yield representative shallow ground water samples. Ground water was inferred to be flowing toward the east-southeast under an average hydraulic gradient of 0.005 foot/foot (ft/ft). Figure 3 illustrates the contoured ground water elevations as measured on 30 August 2004. 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES LM TPH-g was detected in ground water samples collected from wells MW-1 through MW-3 at a Advanced GeoEnvironmental,Inc. i■.