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October 2004 -13- 043 -2170 <br />deployed liner is larger than the slope - corrected Phase IVc lined area of 2,663,000 square feet due to <br />inclusion of liner area within the anchor trenches and liner overlaps. <br />Geomembrane installation in the OSA is discussed further in Section 3.3. Ames anchored <br />geomembrane at the limits of the Phase We OSA in an anchor trench a minimum of 3 feet deep by <br />2 feet wide. Ames backfilled the anchor trench with suitable anchor trench backfill material. Ames <br />placed anchor trench backfill in maximum 12- inch -thick compacted lifts. Anchor trench backfill was <br />compacted with a hand- operated, 500 -]b. vibratory compactor and/or "Jumping Jacks." Phase We <br />OSA geomembrane was connected to the existing Phase Nb OSA geomembrane system with a <br />minimum of 3 feet of overlap per project requirements. <br />2.8 High Volume Solution Collection System <br />Ames installed approximately 26,750 linear feet of 4 -inch diameter Perforated Corrugated <br />Polyethylene (PCPE) HVSCS pipe, 2,450 linear feet of 8 -inch diameter PCPE HVSCS pipe, <br />850 linear feet of 10 -inch diameter PCPE HVSCS pipe, 500 linear feet of 12 -inch diameter PCPE <br />HVSCS pipe, and 110 linear feet of 15 -inch diameter PCPE HVSCS pipe. <br />• <br />Ames began installation of the PCPE HVSCS pipes in May 2004 and finished in September 2004. <br />HVSCS pipe locations are shown in Record Drawing No. 6 in Appendix A. Pipe sections were <br />connected to each other using couplings and pipe ends were capped. Laborers haunched pipes with <br />DCF and kept pipes in place during DCF placement. <br />A network of 4 -inch Tertiary HVSCS pipes were installed approximately 100 feet on- center at a <br />minimum two- percent grade, draining to the larger diameter Secondary PCPE HVSCS pipes. Four - <br />inch Tertiary HVSCS pipe sections were connected to each other using couplings and were attached <br />to the Secondary HVSCS pipes using ties. Laborers haunched pipes with DCF and kept pipes in <br />place during DCF placement. <br />2.9 Drain Cover Fill <br />Ames began placing DCF in the Phase TVc OSA in May 2004, and completed placement in October <br />2004. Ames processed DCF from May 2004 to October 2004 by screening crushed Cresson ore <br />0 material over a vibrating 1'h -inch screen to remove oversize material from the borrow source. Ames <br />I:wiunmwea%Cws.QAPuLVo-IO nM2170.aoo.iiaesccftPWC.a« Golder Associates <br />