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v I29 April 2004 . AGE-NC Project No 98-0511 Page 3 of 7 I • Benzene, toluene, ethylbenzene and xylenes (BTEX) in accordance with EPA Method 8260B • Fuel additives including di-isopropyl ether(DIPE),ethyl tertiary-butyl ether(ETBE),methyl Mtertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2-dibromoethane (EDB) and 1,2-dichloro ethane (1,2-DCA) in accordance with EPA Method 8260B 2 1 5 Borehole Abandonment At the conclusion of soil boring activities, the borings were permanently sealed to prevent vertical migration of contaminants Under EHD oversight, the borehole was backfilled with cement slurry from the total depth to surface grade I2 2Q UARTERLY GROUND WATER MONITORING lie After completion of soil-boring activities,AGE conducted the first quarter ground water monitoring event 2 2 1 Well Monitonng and Evacuation A Solmst water level meter was used to measure the depth to ground water in eight ground water monitoring wells relative to the tops of the well casings The ground water elevations and gradient were determined from this data After recording water level measurements, a disposable bailer was used to evacuate (purge) each monitoring well of standing water(Appendix C) Approximately 6 to 25 gallons were removed from each well Groundwater temperature,pH and conductivity were measured at regular intervals during the purge process using an Oakton water analyzer Monitoring well MW-1 was purged dry prior to evacuating three casing-water volumes Field data sheets are included in Appendix C Purged water was stored on-site in labeled, 55-gallon DOT-approved drums Following purging,the depth to ground water was measured to ensure that a minimum of 80%well- volume recharge had been achieved prior to sampling • Advanced GeoEnvcronmcntal,lnc I