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' 03 December 2004 • AGE-NC Project No 99-0637 ' Page 2 of 4 ' of Health Services (DHS)-certified analytical laboratory, for analysis The samples were analyzed for ' Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in accordance with EPA Method 8015 Modified, • Benzene, toluene, ethylbenzene and total xylenes(BTEX)in accordance with EPA Method ' 8021, and • Fuel additives including 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-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B ' 23 SOIL AND PURGE WATER DISPOSAL On 14 June 2004,Slaby Sales,Inc of Borrego Springs,CA collected twenty 55-gallon drums of soil cuttings and two 55-gallon drums of purge water from the site The soil and purge water were transported under non-hazardous waste manifest to Filter Recycling Services of Rialto,CA an EPA- approved disposal facility On 03 September 2004, American Valley Waste Oil, Inc of Delhi, CA collected approximately 60 gallons of purge water from the site The purge water was transported under non-hazardous waste manifest to Riverbank Oil Transfer of Riverbank,CA an EPA-approved disposal facility Copies of the non-hazardous waste manifests can be found in Appendix B 3.0 FINDINGS IGround water elevation flow direction and gradient were determined from field data collected on 17 August 2004 The MTBE-impact to ground water was quantified from the laboratory analysis of the ground water samples 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION ' At the time of the August 2004 sampling event, depths to ground water ranged from 22 51 feet to 24 45 feet below the tops of the well casings Ground water elevations at the site ranged from 9 63 feet above mean sea level (MSL) in well MW-10 to 10 13 feet above MSL in well MW-3 (Table 1) Ground water elevations at the site averaged approximately 9 89 feet above mean sea level (MSL) showing an elevation decrease of approximately 2 27 feet since the last monitoring event s Advanced GeoEnviron mental,Inc I