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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 Liner Certification <br />August 10, 2010 <br />4.1.5 Permeability Tests <br />AMEC completed permeability testing of SLF material. The testing frequency (approximately <br />one test per 300 cubic yards) exceeded the minimum specified testing frequency of one test per <br />5,000 cubic yards. Testing was performed with a flexible-wall permeameter with back-pressure <br />saturation and a constant rate of flow (ASTM D5084, Method D). The SLF was remolded to <br />95% of the maximum dry density (ASTM D698) and the optimum moisture content. Laboratory <br />testing yielded a coefficient of permeability for the CQA samples met the project specifications. <br />The permeability test results for the SLF are presented in Appendix F. <br />4.2 Field Testing and Monitoring <br />AMEC observed all fill operations in the construction to verify, when necessary; lift thickness, <br />adequate compaction, and acceptable moisture conditions. When AMEC performed nuclear <br />density testing, holes made in the fill during testing were filled by tamping fine SLF material into <br />the holes. AMEC standardized nuclear gauges at the start of each day's work according to <br />ASTM D2922. <br />4.2.1 Subgrade Preparation <br />AMEC monitored subgrade preparation, including verification that Ames compacted the <br />subgrade with a smooth drum vibratory compactor. AMEC verified that Ames removed <br />protruding rocks from the subgrade surface prior to SLF placement. AMEC verified that the <br />subgrade surface was moisture conditioned, smooth, and unyielding prior to SLF placement. <br />4.2.2 Site Grading <br />Structural fill placement was not required as part of the certification area. However, existing <br />material was shaped or compacted for the acceptance of SLF placement. <br />4.2.3 Soil Liner Fill <br />Field testing included monitoring of placement and preparation of SLF for geomembrane <br />deployment, testing in-place moisture and density with a nuclear gauge, and monitoring depth <br />verification. <br />' 4.2.3.1 Field Monitoring <br />AMEC observed SLF placement to verify lift thickness, adequate compaction, acceptable <br />moisture conditions, final compacted thickness, and suitability for geomembrane deployment. <br />AMEC identified angular particles on the fill surface, ruts, and desiccation cracks, and brought <br />' these features to the attention of Ames for repair. When necessary, AMEC verified these <br />repairs were completed. Where necessary, Ames laborers placed fines from their SLF <br />processing plant or from temporary piles of fine SLF to smooth and re-compact the fill surface in <br />SAPROJECTS\1125E CCV CQA\H2 - DESIGN\TRIANGLE\FINAL\TRIANGLE CERTIFICATION REPORT FINAL REV1.DOC 11