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06 November 2006 <br /> AGE-NC Project No 04-1168 <br /> Page 2 of 5 <br /> 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> I On 12 <br /> June 2006,water samples were collected from each well using the inertia pump after allowing <br /> the wells to achieve a minimum 80% recovery of the pre-purge water volume Each water sample <br /> was transferred into laboratory-supplied 40-milliliter (ml) volatile organic analysis (VOA) vials <br /> After collection, the samples were properly labeled, placed in a chilled container, and transported <br /> Iunder chain-of-custody to CTEL for analysis The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br />' Methods 8015M, <br /> • Benzene,toluene, ethylbenzene and total xylenes(BTEX) in accordance with EPA Method <br /> 8260B, and <br /> • Fuel additives di-isopropyl ether(DIPS), ethyl tertiary-butyl ether(ETBE),methyl tertiary- <br /> butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), <br /> I 1,2-dichloroethane (1,2-DCA) and ethylene dibromide (EDB) in accordance with EPA <br /> Method 8260B <br /> 23 NON-HAZARDOUS WASTE DISPOSAL <br /> On 4 January 2006, American Valley Waste 011, Inc of Delhi, California properly manifested and <br /> transported 100 gallons of non-hazardous waste liquid to Riverbank Oil Transfer in Riverbank, <br /> California for disposal The Non-hazardous Waste Manifest is provided in Appendix D <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data The <br /> contaminant impact to ground water was quantified from laboratory analytical data <br /> I31 FIRST QUARTER 2006 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> At the time of the February 2006 sampling event, depths to ground water ranged from 44 36 feet <br /> (MW-2)to 45 05 feet(MW-1)below the tops of the well casings(Table 1) Ground water elevations <br /> at the site averaged approximately 20 35 feet below mean sea level(MSL) The ground water levels <br /> I in wells MW-1 through MW-3 were above the tops of the well screens,indicating that the wells were <br /> "drowned"and ground water samples may not be representative of shallow ground water conditions <br /> Advanced GeoEnvironmental,Inc <br />