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20 January 2004 AGE-NC Project No 95-0109 Page 2 of 4 Temperature, pH and conductivity of the purge water were measured at regular purge-volume intervals using an Oakton water analyzer and the readings were recorded on field logs Field data and work sheets are included in Appendix A The purged water was containerized in 55-gallon DOT-approved drums and stored on-site 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES The depth to water was re-measured after purging to ensure a minimum of 80 per cent recharge of the initial water level in each well prior to sampling Afterwards,water samples were collected from wells MW-11 and MW-14 using a new,disposable plastic bailer and from the remaining wells using a Watera Hydrolift Pump Immediately upon retrieval,the samples were transferred into 40-m1 EPA- approved volatile organic analysis(VOA)vials containing 0 5ml 18%hydrochloric acid as a sample preservative The samples were labeled, stored on ice, and transported in a chilled container, under chain-of-custody,to McCampbell Analytical,Inc (MAI),a State of California Department ofHealth Services-certified analytical laboratory The ground water samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Methods 5030/8015M, Benzene,toluene,ethylbenzene and xylenes(BTEX)in accordance with EPA method 8021, and Fuel additives di-isopropyl ether(DIPE), ethyl tertiary-butyl ether(ETBE), methyl tertiary- butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), 1,2-drchloro ethane (1,2-DCA) and ethylene dibromide (EDB) in accordance with EPA Method 8260B 3.0 FINDINGS Groundwater elevation and flow direction were inferred from the field data The hydrocarbon-impact to ground water was quantified by laboratory analysis of the ground water samples 3 1 GROUND WATER GRADIENT AND DIRECTION The depth to ground water ranged from 56 55 feet to 59 11 feet below the tops of the well casings Ground water elevations at the site ranged from 2 67 feet below mean sea level(msl)in well MW-5 to 5 33 feet below MSL in well MW-17 Groundwater levels were within the screened intervals of water-table wells MW-1 through MW-14 and MW-16,but ranged from approximately 16 to 53 feet Advanced GeoEnvironmeAta4 Inc.