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Cripple Creek & Victor Gold Mining Company <br />Cresson Project <br />Quality Assurance Monitoring and Test Results <br />Liner Recertification <br />December 17, 2009 <br />T-Ilm <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. AMEC verified these repairs were completed. <br />Ames laborers placed fines from their SLF processing plant or from temporary piles of fine SLF <br />to smooth and re- compact the fill surface in areas that were observed to be rough or <br />inadequate, as discussed in Section 6.1.2. AMEC and Lonestar approved the final surface of <br />the SLF prior to geomembrane deployment. <br />4.2.3.2 Moisture- Density Test Results <br />AMEC performed a total of five in -place moisture - density tests of SLF. AMEC compared results <br />of the field moisture content and density tests to the Proctor dry density and optimum moisture <br />content values of material with similar gradation and plasticity characteristics. Proctor dry <br />density and optimum moisture content values for samples with greater than ten percent plus <br />three- quarter -inch (3/4 inch +) material were corrected according to ASTM D4718 to facilitate <br />direct comparison to nuclear density values. The moisture - density testing frequency of <br />approximately one test per 300 cubic yards exceeded the minimum specified testing frequency <br />of one test per 500 cubic yards. Nuclear density tests performed for the Phase IV recertification <br />SLF are summarized in Table 6. Holes made in the SLF during testing were filled by tamping <br />fine SLF or bentonite material into the holes. <br />d o 4.2.3.3 Depth Verification <br />AMEC drilled a total of three holes in the compacted SLF to verify that the minimum 12 -inch <br />compacted depth had been achieved. AMEC monitored the SLF depth verification tests and <br />documented results. Depth verification holes were filled with bentonite chips and water. Both of <br />the holes drilled into the SLF had compacted depths of 12 inches. The testing frequency <br />exceeded the minimum specified testing frequency of two measurements per acre. The SLF <br />depth verification results are presented in Table 7. <br />4.2.4 Drain Cover Fill <br />AMEC provided visual monitoring of DCF placement. One AMEC monitor and at least two <br />Ames laborers were present monitoring each dozer, unless two dozers were within <br />approximately 50 feet of each other during DCF placement. AMEC verified that wrinkles in the <br />geomembrane did not fold over, that PVC grade markers were placed on a maximum 50 -foot by <br />50 -foot grid and at grade breaks, and that unsuitable material was not present in the fill. AMEC <br />continuously inspected geomembrane during DCF placement, and marked areas for repair, if <br />required. If needed, any repairs were documented and AMEC verified the repairs were <br />completed. After final grading, AMEC monitored removal of PVC grade markers. <br />SAPROJECTS \1125E CCV CQA \H2 - DESIGN\LINER RECERTIFICATION REPORT\REPORT BODY\QA MONTIORING AND TEST RESULTS LINER 12 <br />RECERTIFICATION.DOC <br />