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Cripple Creek & Victor Gold Mining Company <br />Cresson Project <br />Quality Assurance Monitoring and Test Results <br />Load Out Bin Relocation <br />July 7, 2009 <br />ameO <br />Ames graded existing slopes and placed SF so that final slopes were no steeper than 2.5H:1V. <br />Prior to fill placement, the in -situ material was scarified to a depth of approximately 6 inches. <br />SF was compacted with a minimum of four passes by a smooth drum vibratory compactor. <br />Ames placed a small amount of SF (less than 2000 CY) for site grading. <br />2.3 Subgrade Preparation <br />Prior to SLF placement, Ames moisture conditioned and compacted the entire surface of the <br />LOB with a smooth drum vibratory compactor. The quality of the finished surface was then <br />maintained until SLF was placed. <br />2.4 Soil Liner Fill <br />Based on neat -line survey, Ames placed and compacted approximately 1,245 cubic yards of <br />SLF in the LOB footprint. Figure 5 presents the as -built surface of the SLF. <br />Ames processed the SLF for the LOB construction previously during phase IV construction. <br />Ames worked the borrow material through a rotary mill and screen to remove oversized material <br />from the SLF and to uniformly condition the material prior to stockpiling at the Arequa process <br />stockpile. <br />Ames began placing SLF on the LOB pad in April 2009. The SLF was compacted to a minimum <br />thickness of 12 inches by a smooth -drum vibratory compactor. AMEC observed SLF depth <br />verification tests performed by Ames to confirm appropriate fill depth. Any areas that were <br />found to be deficient in thickness were reworked and retested until the area met specifications. <br />The SLF depth verification is discussed in Section 4.2.4.3. SLF was moisture - conditioned and <br />compacted as needed to meet project specifications. The minimum SLF density was 95 percent <br />of the maximum dry density at optimum moisture content to 3 percent wet of optimum as <br />determined by standard Proctor tests performed by AMEC. Areas of the SLF that initially failed <br />to meet the moisture - density requirement were moisture - conditioned, if necessary, and <br />re- compacted to achieve the required 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 G. <br />SAPROJECTSU 125E CCV CQA \H3 - CONSTRUCTION \LOB CERT REPORT\REPORT BODY\LOB CERT REPORT 2009.07.01.DOC 7 <br />