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Cripple Creek & Victor Gold Mining Company <br />Squaw Gulch VLF Phase 1 <br />(9,550-foot Elevation Bench to Geomembrane Panel P1635) <br />Final Report <br />Quality Assurance Monitoring & Test Results <br />January 2016 <br />Project No.: 74201125N0 Page 9 <br />trench. SSF was then placed over the geotextile to a minimum depth of 6 inches. The <br />secondary underdrain geosynthetic installation is discussed further in Section 3.1. <br />Approximately 697 cubic yards of UF, 175 cubic yards of SSF, and 32,934 square feet <br />of geotextile were used to construct the secondary underdrain. <br /> Tertiary Underdrain System <br />Ames constructed 537 feet of tertiary underdrain. Record Drawing No. 3 shows the <br />location of the tertiary underdrain system. Details of the tertiary underdrain system can <br />be found on IFC Drawing A250. The cross-section dimension of the tertiary underdrain <br />was 3 feet wide by 2 feet deep, providing a cross-sectional area of 6 square feet as <br />shown on IFC Drawing A250. Ames excavated each tertiary underdrain trench to the <br />minimum dimensions, and placed geotextile and UF in the trench. SSF was then placed <br />over the geotextile to a minimum depth of 6 inches. The tertiary underdrain geosynthetic <br />installation is discussed further in Section 3.1. Approximately 120 cubic yards of UF, 30 <br />cubic yards of SSF, and 6,439 square feet of geotextile were used to construct the <br />tertiary underdrain. <br /> Geomembrane Installation of the Underdrain Ponds <br />Ames installed geosynthetic clay liner (GCL) followed by 80-mil LLDPE Geomembrane <br />in the Underdrain Ponds per the agreement with DRMS per the letter from Amec Foster <br />Wheeler Dated March 31, 2015. A copy of this letter and drawing is located in Appendix <br />M.6 for reference. The GCL and 80-mil LLDPE Geomembrane were installed per the <br />manufacture specifications, project specifications, and the specifications outlined on the <br />drawings with the submitted letter. Record drawings of the GCL deployment and <br />geomembrane deployment are located in Appendices M.1 and M.3 respectively. <br />Manufacture certifications for the GCL and the geomembrane liner are located in <br />Appendices M.2 and M.5 respectively with geomembrane installation observations <br />located in Appendix M.4. The rolls of geomembrane liner used, was previously approved <br />geomembrane from remaining partial rolls onsite. The rolls were protected during <br />storage prior to use and were visually inspected prior to installation. <br />2.3 Site Grading <br />Prior to SF placement, Ames moisture conditioned and compacted the subgrade surface <br />of the fill areas. Amec Foster Wheeler monitored the preparation of the subgrade and <br />verified that it met project technical specifications. In native ground, the in situ material <br />was scarified to a depth of approximately 6 inches prior to SF placement. The SF <br />material was placed in approximately 2 to 3-foot-thick loose lifts and compacted with a <br />minimum of four passes by a smooth drum vibratory roller. Ames placed approximately <br />68,755 cubic yards of SF for site grading in the Project footprint.