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1 <br />' welded to the top of the pipe as a saeen for debris. <br />t The secondary and primary liners as well as the Gunet, at the lined inlet channel to the pond, were <br />tied into the pond primary and secondary liners and Gunet to give a continuous unbroken liner for <br />' leak detection and solution flow. <br />BMG felt that a second liner, placed over the primary liner, covering the sump area, would protect <br />' the primary liner. The contractor installed this second primary liner to the same specifications and <br />inspection criteria as the primary liner. <br />4.6 Pump House Area Liner <br />' A single liner was placed between the pump house and the solution pond, on the west, and the <br />solution ditch, on the north, beneath the 24 in water return pump lines, to prevent any spillage of <br />' the pump back solution. The subgrade was prepared prior to the placement of the 60 mil HDPE <br />liner. Both Gundle and Gagle (liner contractors) worked on the installation. Vacuum testing of <br />the extruded seams was observed by S12K inspectors, as well as the actual welding process. No <br />' destructive samples were taken due to the size of the area being worked. All repairs were either <br />by patching or extrusion welding a bead. <br /> <br /> <br /> <br />1 <br /> <br /> <br />1 <br /> <br /> <br />The concrete foundation of the pump house was attached to the 60 mil liner using bolts cemented <br />into the concrete, mastic placed against the concrete, then a metal plate with the liner between the <br />mastic and the plate placed in position prior to bolting to the foundation. <br />Type 2 material was placed over the liner, after acceptance, to protect the liner from the 24-in <br />pipes. <br />4.7 Collection Ditches and Channel Liner <br />The delivery channel between the main embanlattent and the solution pond was continuously lined <br />with a primary and a secondary liner consisting of 60 mil IiDPE, with a leak detection system <br />between the two wnsisting of gannet material <br />'Itvo liner contractors, Gundle Lining Systems, and Gagle Company Inc., used extrusion welders to <br />weld seams, repair holes, and make "I" connections in the two liners. All of the extrusion welds <br />were vacuum tested for water tightness. <br />19 <br /> <br />