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Cripple Creek & Victor Gold Mining Company <br />Cresson Project <br />Quality Assurance Monitoring and Test Results <br />Phase 4B/C Triangle t.iner Certification <br />August 10, 2010 <br />Ames processed the SLF for the Phase 413/4C Triangle construction as part of the Phase 5 <br />construction activities. Ames worked the borrow material through a rotary mill and screen to <br />remove oversized material from the SLF and to uniformly condition the material prior to <br />stockpiling. <br />The SLF was compacted to a minimum thickness of 12 inches by a smooth-drum vibratory <br />compactor. AMEC observed SLF depth verification tests performed by Ames to confirm <br />appropriate fill depth. Any areas that were found to be deficient in thickness were reworked and <br />retested until the area met specifications. The SLF depth verification is discussed in <br />Section 4.2.3. SLF was moisture-conditioned and compacted as needed to meet project <br />specifications. The minimum SLF density was 95 percent of the maximum dry density at <br />optimum moisture content to 3 percent wet of optimum as determined by standard Proctor tests <br />performed by AMEC. Areas of the SLF that initially failed to meet the moisture-density <br />requirement were moisture-conditioned, if necessary, and re-compacted to achieve the required <br />compaction. <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. AMEC <br />then inspected the surface. Sharp or angular stones greater than 0.75 inches in diameter were <br />removed from the finished surface. AMEC approved fill surfaces prior to release to Lonestar <br />(Geomembrane Subcontractor to Ames) for deployment. AMEC provided formal subgrade <br />approval prior to geomembrane deployment. The subgrade acceptance forms are presented in <br />Appendix E. The SLF layout is shown on Figure 4. <br />2.3 Geomembrane Liner <br />A single geomembrane composite liner system was installed in the Phase 413/4C Triangle area. <br />The composite liner system consists of a minimum of 12 inches of compacted SLF overlain by a <br />single layer consisting of 100-mil single sided texture LLDPE geomembrane. <br />Ames anchored geomembrane at the limits of the Phase 413/4C Triangle area in a 3 feet deep <br />by 2 feet wide anchor trench. Ames backfilled the anchor trenches with suitable anchor trench <br />backfill material. Ames placed anchor trench backfill in maximum 12-inch-thick compacted lifts. <br />Anchor trench backfill was compacted with "Jumping Jacks." The geomembrane liner <br />overlapped and was extrusion welded to the Phase IV VLF liner system, as detailed in Phase 5 <br />IFC Drawing No. A250. The geomembrane as-built panel layout is shown on Figure 5. <br />Upon completion, a 2 -foot layer of DCF was then placed over the geomembrane. <br />S:\PROJECTS\1125E CCV CQA\H2 -DES IGN\TRIANGLE\F INAUTRIANGLE CERTIFICATION REPORT FINAL REV1.DOC 6