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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 />areas that were observed to be rough or inadequate, as discussed in Section 6.1.2. AMEC and <br />Lonestar approved the final surface of the SLF prior to geomembrane deployment. <br />4.2.3.2 Moisture-Density Test Results <br />AMEC performed a total of four (4) in-place moisture-density tests of SLF. AMEC compared <br />results of the field moisture content and density tests to the Proctor dry density and optimum <br />moisture content values of material with similar gradation and plasticity characteristics. Proctor <br />dry density and optimum moisture content values for samples with greater than ten percent plus <br />three-quarter-inch material were corrected according to ASTM D4718 to facilitate direct <br />comparison to nuclear density values. The moisture-density testing frequency of approximately <br />one test per 75 cubic yards exceeded the minimum specified testing frequency of one test per <br />500 cubic yards. Nuclear density tests performed for the Phase 4B/4C Triangle certification <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 />4.2.3.3 Depth Verification <br />AMEC drilled a total of two (2) 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 at grade breaks, and that <br />unsuitable material was not present in the fill. AMEC continuously inspected geomembrane <br />during DCF placement, and marked areas for repair, if required. If needed, any repairs were <br />documented and AMEC verified the repairs were completed. After final grading, AMEC <br />monitored removal of PVC grade markers. <br />4.2.5 Temperature Monitoring <br />AMEC monitored ambient air temperatures using a digital thermometer. Temperatures were <br />monitored throughout the day. The lowest and highest daily temperatures are summarized in <br />Table 2. <br />S:\PROJECTS\1125E CCV CQA\H2 - DESIGN\TRIANGLE\FINAL\TRIANGLE CERTIFICATION REPORT FINAL REVI.DOC 12