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05 March 2004 7. AGE-NC Project No. 96-0254 Page 4 of 5 4.1. IN-SITU'OZONE SPARGINGWEL'L INSTA ATION The proposed ozone 'sparge.'diffuser wells.-will be in talled utilizing a truck-mounfed`drill rig equipped with 8.25-inch diameter hollow stem.augers.The Hollow stem augers will be cleaned prior to advancement of each borehole. The ozone spare wells" will be advanced to depths of. : . . approximately 30 feet.bsg: ' The ozone sparge wells will.be completed-with manufacturer-assembled 2-inch by 307inch microporous sparge diffuser.points and.casings.The spar c diffuser points will.be installed at a depth ` of approximately 30 feet bsg in the water bearing zone. The well materials will be,placed into the. borehole through the-interior of the hollow-stem.augers:Aft.er installing the sparge point and casing, filter pack..material consisting of pre-washed #2/16 s d.will-be added from the bottom of the. borehole to approximately two,feet above the.sparge point..- A"nominal'two-foot thick bentonite sealwill be placed above the filter pack of each well to'minimize the potential of grout'penetration into the filter pack or creene' d section of the well:The•bentoinite seal will be formed bypouriiig bentonite chips.into,the annulus and allowing them to settle on.the filter pack.-Bentonite chips will be-hydrated using five allons of water, unless-water is present in the interior of the hollow-.stem augers:-The bentonite chips will be allowed to hydrate for a minimum of one-half hour prior.to grouting. Following hydration of the bentonite chips,the remaining annular space will be filledto within one foot of the ground surface"with a cement grout. The gro t mixture will consist of type I/II portland° neat cement and-not more than 6'gallons-of water per 94-pound sack of cement. The,grout will be placed by pumping through a,tremmie pipe or the hollow stem augers:For inspection purposes,the . EHD will be notified.at least 48 hours prior to conducting grouting procedures. A3/4-inch PVC riser will connect the sparge points to the-distribution sy§ten t and ozone generator. A traffic=rated'well box will•be,installed over each spargewell. N. 4.2, IN-SITU OZONE SPARGING DISTRIBUTI. NETWORK/SYSTEM A:iietwork of%-inch diameter,PVC tubing will be instal ed in appropriately sized conduit in a series of trenches approximately 8-inches wide and 12-inches deep. -Ozone'distribution lines will lie routed underground Rom each`IOSwell head ta•the a solenoid control valve on the ozone-generator..,An oxygen con eraser and ozone generator is fitted into a - compressed air-strearn-through a throttled venture.This ow stream-is then connectedto a manifold, under a,.timer cycled into the sparge wells.using a.3/8- rich diameter polyethylene tubing to well heads through a network via underground piping.The O one-IAS system delivers 10 standard cubic Advanced GeoEuvironmental,Inc.