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I - 09 April 2002 AGE-NC Project No. 97-0301 71 Page 11 of 14 4.3 . WELL DEVELOPMENT Development of the proposed wells will consist of a combination of bailing with a two- or four-inch diameter stainless steel and/or PVC bailers to remove the major portion of fine-grained sediment from inside the well, surging to flush out or draw in sediment from the filter pack and additional ground water evacuation (purging) with a submersible pump to finish the removal of fine-grained sediment. Developmental purging activities will be continued until field parameter (pH, electrical conductivity, and temperature) readings have stabilized and purged water is visually sediment-free. Well development will occur no sooner than 72-hours following well completion. rDevelopment of the proposed multi-level wells will consist of a combination of bailing and additional ground water evacuation (purging) with a3/8-inch teflon tube bailer and Watera-Hydro- 1 Lift 11 pump to remove the major portion of fine-grained sediment from inside each well partition. J Developmental purging activities will be continued until field parameter (pH, electrical conductivity, and temperature) readings have stabilized and purged water is visually sediment-free. 4.4. GROUND WATER AQUIFER PUMPING TEST A 24-hour ground water aquifer pumping test will be conducted at the site to induce a decline in static water level in the newly installed ground water extraction well (screened 25 to 55 feetbsg). Pressure transducers will be deployed, at a minimum, in wells EW-1 , AW- 1 , V W- 1 , VW-2. MW- 1 , MW-4 and MW-7 to measure the difference in ground water levels before well pumping versus time ! during ground water extraction. A constant ground water pumping rate (approximately 5 gallons per l minute) will be utilized from the ground water extraction well during the aquifer pump test to achieve optimum draw-down influence. l J Grab water samples will be collected at 6-hour intervals an submitted to a DHS-certified laboratory for the following constituents: 0 TPH-g/TPH-d/TPH-k/TPH-mo in accordance with EPAMethod 8015 Modified/5030/3550; BTEX, methanol, ethanol, 1 ,2-DCA, EDB, MTBE, TAME, DIPE, ETBE and TBA byEPA Method 8260 Modified; and • Total lead by EPA Method 7420. Laboratory reports for ground water analysis, testing methods, laboratory quality assurance/quality control (QA/QC) reports, and sample chain of custody documentation will be presented in a report with findings and recommendations. �__� Advanced GeoEnvironmental, Inc.