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Cripple Creek & Victor Gold Mining Company <br />Cresson Project <br />Quality Assurance Monitoring and Test Results �� a <br />Liner Recertification V <br />December 17, 2009 <br />are presented in Appendix G. CQC Proctor tests were not included in the Proctor testing <br />frequency. <br />4.1.5 Permeability Tests <br />At the direction of AMEC, a permeability test of SLF material (pre- existing and newly placed) <br />was completed by Knight Piesold. The testing frequency (approximately one test per 300 cubic <br />yards) exceeded the minimum specified testing frequency of one test per 5,000 cubic yards. <br />Testing was performed with a flexible -wall permeameter with back - pressure saturation and a <br />constant rate of flow (ASTM D5084, Method D). The SLF was remolded to 95% of the <br />maximum dry density (ASTM D698) and the optimum moisture content. Laboratory testing <br />yielded a coefficient of permeability for the CQA samples met the project specificatons. The <br />permeability test results for the SLF are presented in Appendix G. <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 recertification areas. 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 />SAPROJECTS \1125E CCV CQA \H2 - DESIGN\LINER RECERTIFICATION REPOR RREPORT BODY\OA MONTIORING AND TEST RESULTS LINER 11 <br />RECERTIFICATION. DOC <br />