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.;_ _ . . ff�p _ . `, rte•.'- ` Y._. . ,. '� - ��-''�?!_ <br />'r <br /> Specification R41025.[li <br /> approximately two to three feet above the conduit bottom, two foot of bentonit;; <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 cementor concrete would be <br /> finished below grade level aad 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 /> 5.4 We11$nxe <br /> Cap Cop 11 mcnitoring 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, lockable <br /> and capable of providing adequate suppori under a 10,00 pound single wheel <br /> axal load. <br /> rE, <br /> .., 6.0 i II n <br /> 6.1 Air Condaitw rk 1 <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 /> f ' Connections to air wells and skid would be made with flexible materials. <br /> Individual conduits would be accessiNe for measurement of flow rates,pressures <br /> and vacuum. Required samples of the process gas would be taken from sample <br /> ' taps loco?ed at the blower. <br /> 6.2ude r n P.iping <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 local codes and <br /> would be designed to withstand traffic loads in areas accessible to vehicles. <br /> 6.3 Tigatrnent fell Cao <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 contreYed and directed air flow through the <br /> vadose zone. The paved cap essentially reduces the time necessary to remove the <br /> 13.5 REMEDIATION <br /> SERVICES, INC. <br />