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' 23 April 2002 AGE-NC Project No 95-0142 Page 12 of 16 or equivalent A traffic-rated well box will be installed-over each newly installed well A grouting ' inspection will be scheduled with EHD personnel AGE's experience installing extraction wells in San Joaquin County has shown that the above procedures generally result in wells that can be surged, developed and that produce ground water with minimal sediment This extraction well construction will allow for adequate water production ' during the ground water extraction conducted at the site 4 4 WELL DEVELOPMENT/SAMPLING Development of the proposed extraction wells will consist of a combination of bailing with a ' stainless steel bailer 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 assist in the removal of fine-grained sediment Developmental ' purging activities will continue until field parameter(pH, electrical conductivity, and temperature) readings have stabilized and purged water is visually sediment-free lie 4 5 GROUND WATER EXTRACTION ACTIVITIES 1 Ground water will be extracted from the four newly installed extraction wells(EW-3 through EW-6) and ground water extraction wells EW-1 and EW-2 utilizing submersible,4-mch diameter Grundfos Rediflow self-priming downhole pumps Each pump will be outfitted with automated electronic shut-off controls to control water entering the system During the pumping operation,the estimated total ground water extraction flow rate will be 20 gpm if multiple wells are used AGE anticipates ' total ground water extraction flow of five GPM from an individual well,therefore a surge pumping technique maybe implemented at each well head,if multiple wells are utilized,to control the volume of produced water The total treatment flow rate will be 20 gpm ' From each well head,extracted ground water will flow into a 750-gallon holding tank and be routed through a sediment pre-filter, from which it will pass through a process pump, to the in-line GAC absorption vessels The GAC 'treatment is intended to adsorb hydrocarbons through carbon adsorption Water sampling ports will be located after the process tank(holding) and after the GAC vessels for monitoring purposes A generalized design of the treatment system is depicted in Figure 4b Advanced GeoEnvironmental,Inc