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specification R91W---Ql <br /> approximately two to three feet above the conduit bottom, two foot of bentonite <br /> would be added for sealing and the remainder of the borehole would be filled <br /> with either neat cement or concrete. The second well would be constructed <br /> similarly in a shallower adjacent borehole. The cement or concrete would be <br /> finished below grade level and well cover would be installed at grade level. <br /> Down-hole tools and materials (other than well packing material) used to <br /> construct the wells would be steam-cleaned to remove organics before use. The <br /> remaining injection and withdrawal air wells would be constructed in a similar <br /> manner. <br /> 3 <br /> 5.4 We1113oxe5 <br /> Cap Cop II monitoring well covers,manufactured by Westinghouse Groundwater <br /> Recovery(or equivalent),would be used to complete the wells at ground surface. <br /> The covers, measuring 24-inches square, are water and dust resistant, Iockable <br /> and capable of providing adequate support under a 10,000 pound single wheel <br /> axal load. <br /> 6.0 EquipmenjInstallation <br /> a 6.1 Air Condpit_Network Assembly <br /> Piping would be primarily 2-inch diameter Schedule 40 or 80 PVC pipe. Minimal <br /> amounts of metal piping or PVC hose would be used. These conduits would be <br /> routed to the blower beneath the site paving in conformance with local codes. <br /> The air lines would be removed during demobilization of the treatment system. <br /> Connections to air welN and skid would be made with flexible materials. <br /> Individual conduits would be accessible for measurement of flow rates,pr sures <br /> and vacuum. Required samples of the process gas would be taken from sample <br /> taps located at the blower. <br /> 6.2Slnderground Piping <br /> i • <br /> Underground piping between well heads and blower equipment would be <br /> installed in trenches, backfilled, and resurfaced to generally match existing <br /> pavement. Piping depth and backfill would be in accordance with Iocal codes and <br /> would be designed to withstand traffic loads in areas accessible to vehicles. <br /> 6.3 Treatment Cell Can <br /> Cracks and crevices in existing pavement at the site would be caulked if necessary <br /> to form a cover that restricts connection to the atmosphere, retards. water <br /> infiltration and promotes a more controlled and directed air flow through the <br /> vadose zone. The paved cap essentially reduces the time necessary to remove the <br /> ..... ........ ..... <br /> B-6 REMEDIATION <br /> sERVICES. INC. <br />