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S ' • 15 July 2003 AGE-NC Project No 95-0109 Page 2 of 5 ' 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 z ' 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-7 and MW-14 using a new,disposable plastic bailer and from the remaining wells using a Watera Hydrolifl Pump Immediately upon retrieval,the samples were transferred into 40-m1 EPA- approved VOA vials containing 0 5ml 18%hydrochloric acrd 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 of Health 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, O Benzene,toluene,ethylbenzene and xylenes(BTEX)in accordance with EPA method 8021, ' C Fuel additives di-isopropyl ether (RIPE), ethyl tertiary-butyl ether(ETBE),methyl tertiary- butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), 1,2-dichloroethane (1,2-DCA) and ethylene dkbromYde (EDB) in accordance with EPA ' Method 8260B, and - 1 3.0. FINDINGS ' Ground water 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 r , The depth to ground water ranged from 53 09 feet to 59 04 feet below the tops of the well casings Ground water elevations at the site ranged from 5 26 feet below mean sea level (MSL) in well MW-17 to 0 83 feet above MSL in well MW-2 Ground water levels were within the screened ' intervals of water-table wells MW-1 through MW-14 and MW-16,but ranged from approximately 17 to 54 feet above the screened intervals of the deep-screened wells MW-15 and MW-17 through Advanced GeoEovironme¢tal,Inc E 1 k