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2002 -16- 003-2203 <br />Prior to geomembrane deployment on the SLF, Ames proof-rolled, compacted, and <br />hand-worked the fill surface to be free of desiccation cracks and abrupt grade changes. Golder <br />then inspected the surface. Sharp stones were removed. Locally, Ames placed fines stockpiled <br />from the Portland Tailing beneath Pad No. 3 to smooth the fill surface in azeas that were <br />observed to be rough (Meteoric Water Mobility test results for the Portland Tailing were <br />provided by CC&V and are presented in Appendix N). Golder approved the fill surface prior to <br />release to Poly-Flex. Poly-Flex provided formal subgrade approval prior to geomembrane <br />deployment. Poly-Flex's subgrade acceptance forms are presented in Appendix G. <br />2.7 Ore Storage Area Composite Liner System <br />The composite liner system in the Ore Storage Area (OSA) consists of a minimum of 12 inches <br />of compacted SLF overlain by 80-mil single-sided textured LLDPE geomembrane, with the <br />textured side in contact with SLF. Poly-Flex installed approximately 1,430,000 squaze feet <br />. (neatline) of geomembrane in the OSA, including geomembrane in the anchor trench and <br />overlap. Geomembrane installation in the OSA is discussed further in Section 3.3. Ames <br />anchored geomembrane at the limits of the Phase IVa Area in an anchor trench a minimum of <br />3 feet deep by 2 feet wide. Ames backfilled the anchor trench with suitable anchor trench <br />backfill material. Ames placed anchor trench backfill in maximum 12-inch-thick compacted <br />lifts. Anchor trench backfill was compacted with ahand-operated, 500-Ib. vibratory compactor <br />and "Jumping Jacks." Phase IVa geomembrane was connected to the existing Phase I and <br />Phase I Expansion geomembrane with a minimum of 3 feet of overlap per project requirements. <br />2.8 Drain Cover Fill <br />Ames began placing DCF in the Phase IVa Area in June 2002, and completed placement in <br />August 2002. Ames processed DCF from June 2002 to August 2002 by screening Pad No. 4 <br />material over a vibrating one and one-half inch screen to remove oversize material from the <br />fill. Ames placed approximately 105,920 cubic yazds of DCF in the OSA. DCF was placed <br />• in a minimum 2-foot thick lift over the geomembrane and in a 120-inch thick lift where <br />c~omzzo3weoo~cenxeposozwo~zzo3 aaoo oa~ao,n ao~ Golder Associates <br />