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I19 October 2004 . AGE-NC Project No. 97-0343 Page 2 of 4 labeled, placed in a chilled container, and transported under chain-of-custody to Cal Tech Environmental Laboratories(CTEL),aDepartment of Health Services-certified analytical laboratory. The ground water samples were analyzed for: • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and as diesel (TPH-d) in accordance with EPA Method 8015 Modified; r • 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 butyl alcohol (TBA), 1,2-dichloroethane (1,2-DCA), and 1,2-dibromoethane (EDB) in accordance with EPA Method 8260B. 2.3. WASTE DISPOSAL On 22 April 2004, Slaby Sales of Borrego Springs, California collected 8 soil drums from the site. The soil was transported under non-hazardous waste manifests to Filter Recycling Services in Rialto, California, an EPA-approved disposal facility. 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 June 2004.The contaminant impact to ground water was quantified from the laboratory analytical data. 3.1. GROUND WATER GRADIENT AND FLOW DIRECTION At the time of the June 2004 sampling event,depths to ground water in wells MW-4 through MW-8 ranged from 58.45 feet to 60.06 feet below the tops of the well casings; ground water elevations I ranged from 30.18 feet below mean sea level(MSL)in well MW-4 to 31.87 feet below MSL in well MW-5 (Table 2). The average ground water elevation at the site this quarter was 31.34 feet below MSL. The average groundwater elevation at the site decreased 5.34 feet between the March 2004 and June 2004 sampling events. Based on depth to ground water measurements, ground water at the site appeared to be flowing in a northeast plunging trough. The southeast and northwest limbs of the trough were flowing under • an average hydraulic gradient of approximately 0.03 8 foot/foot north-northwest and 0.006 foot/foot Advanced GeoEnvironmental,Inc.