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October 2004 -13- 043-2170 <br />• deployed liner is larger than the slope-corrected Phase Nc lined area of 2,663,000 squaze 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 Nc 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 ahand-operated, 500-1b. vibratory compactor and/or "Jumping Jacks." Phase Nc <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 26,7501inear feet of 4-inch diameter Perforated Corrugated <br />Polyethylene (PCPE) HVSCS pipe, 2,4501inear feet of 8-inch diameter PCPE HVSCS pipe, <br />8501ineaz 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 />INSCS 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 FNSCS 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 Nc 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 />• material over a vibrating 1 %z-inch screen to remove oversize material from the borrow source. Ames <br />uw~uimmaomcw~neerv~-iowwnu~a.wao.ixms.cmenrv~e~ Golder Associates <br />