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' 26 August 2004 • AGE-NC Project No. 98-0520 Page 2 of 4 After collection, the samples were,properly labeled, placed in a chilled container and transported ' under chain of custody to Cal' Tech Environmental Laboratories (CTEL), a State of 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; and ' including meth Benzene, toluene, ethylbenzene and xylene (BTEX),and fuel additives, g 1 y tertiary-butyl ether(MTBE), tertiary butanol(TBA), di-isopropyl ether (DIPE), ethyl tent- ' butyl'ether (ETBE), tert-amyl methyl ether (TAME), 1,2-dichioroethane (1,2-DCA) and 1,2-dibromoethane (EDB) in accordance with EPA Method 8260B. 2.3. PURGE WATER DISPOSAL On 13 January2004 American Valle Waste Oil Inc. of Delhi CA collected approximately 170. Y pp Y gallons of purge water from the site:The purge water was transported under non-hazardous waste manifests to Seaport Environmental of Redwood City, CA an EPA-approved disposal facility. Copies of the non-hazardous waste manifests can be found in Appendix C. 3.0. FINDINGS Groundwater elevation and flow direction were determined from field data collected on 22 March 2004.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 groundwater ' from the surveyed casing elevations (Table 1). Depths to ground water ranged from 22.01 feet ; (MW-7) to 23.14 feet (MW-6) below the tops of the well casings (btoc). Ground water elevations at the site (not including MW-6) averaged approximately 13.99 feet above mean sea level (MSL) ' showing an elevation increase,of approximately 1.08 feet since the last monitoring event. ' 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.During the First Quarter 2004,net ground water ' Advanced GeoEnvironmental,Inc.