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- 15 February 2002 AGE-NC Project No 96-0229 Page 10 of 12 combination of bailing with a two- or four-inch diameter stainless steel and/or PVC bailers to remove the mayor 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 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 45 feet bsg) Pressure transducers will be deployed, at a minimum, in wells EW-1, MW-1,MW-2,MW-3,MW-4 and MW-6 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 minute) will be utilized from the ground water extraction well during the aquifer pump test to achieve optimum draw-down influence Grab water samples will be collected at 6-hour intervals an submitted to a DHS-certified Iaboratory for the following constituents • TPH-g in accordance with EPA Method 8015 Modified/5030, • BTEX compounds and MTBE in accordance with EPA Method 8020, • Fuel oxygenated compounds including MTBE, TAME, di-isopropyl ether (DIPE), ethyl tertiary-butyl ether(ETBE) and tertiary butanol (TBA)by EPA Method 8260 Modified, and • 1,2-Dichloroethane (1,2-DCA) and ethylene dibromide (EDB) by EPA method 8260 Modified • Total lead by EPA Method 7420 T 1-,._...�,.. ..�.. 1 t,,..,�. 4cc4r nr, mati-inric lai�nYatnn/ nliality n z niranrP/qualltV control LatJorator repoIt 1ki loll aila1y010, (QA/QC) reports, and sample chain of custody documentation will be presented in a report with findings and recommendations Purged ground water will be containerized in an on-site 10,000-gallon Baker tank, following the 24- hour pump test, a composite "grab" ground water sample will be collected from the Baker tank to analyze for TPH-g,BTEX,MTBE,TBA, TAME,DIPE,ETBE,EDB and 1,2-DCA by EPA Methods 8015M, 8020 and 8260M The purged ground water will be transported under non-hazardous waste Advanced GeoEnvironmcntal,Inc