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* " 0 • . 07 December 2001 AGE Project No 96-0232 Page 8 of 9 pump which will be outfitted with automated electronic shut-off controls to control water entering the system AGE anticipates total ground water extraction flow between 20 and 25 GPM, therefore a surge pumping technique will be implemented at each well head to control the volume of produced water From each off-site extraction well head, extracted ground water will be routed through a sediment pre-filter and into the 1,000-gallon holding tank, from which it will pass through a process pump, a bag filter with gauges on to the first GAC vessel and subsequently the second and third GAC vessels Again, the GAC units are designed to adsorb as much gasoline compounds as possible prior to introduction into the Sun Solve vessels Following the GAC treatment, the water will be routed through three vessels of Sun Solve, which are connected in series The Sun Solve is intended specifically to adsorb MTBE Sample ports will be located in appropriate positions between and after the GAC and Sun Solve vessels for monitoring purposes 6 2 1 Off-site Ground Water Extraction Well Installation Installation of three ground water extraction wells is proposed utilizing a limited access truck- mounted drill rig equipped with 12-inch diameter hollow stem augers Hollow stem augers will be cleaned prior to advancement in each borehole The wells will be advanced to depths of approximately 35 feet bsg and completed with 6-inch diameter, schedule 40 PVC well casing emplaced through the hollow stem augers Each well will utilize twenty-five feet of slotted well casing (0 020-inch screen size) from 10 to 35 feet bsg A #3 Lonestar Lapis Luster sand will be poured down the annulus between the well casing and the inner wall of the hollow stem auger The filter pack will be placed adjacent to the screen from the bottom of the boring to a point approximately 2 feet above the top of the screen A nominal three-foot interval of bentonite pellets (annular seal)will be placed above the filter pack Portland cement will be utilized to grout from the annular seal to within a foot of surface grade A ground water extraction well construction diagram is depicted in Figure 7 6 2 2 Off-Site Ground Water Extraction Piping System A network of two-inch diameter, schedule 80 PVC piping will be installed from Rocky's Restaurant property to Flag City Chevron property in a trench approximately 1 foot wide by 1 Meet deep The PVC piping will be routed from each off-site ground water extraction well head to a water holding tank, the holding tank will be directly connected to the GAC - Sunsolve ground water treatment system Advanced GeoEnvironmentsl,Inc