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Cripple Creek&Victor Gold Mining Company ■ <br /> Squaw Gulch VLF Phase 2A Part 2 ■ <br /> Record of Construction Report <br /> 475.0106.032 <br /> September 30,2019 <br /> maximum dry density at minus 2 percent to plus 3 percent of optimum moisture content as <br /> determined by American Society for Testing and Materials (ASTM) D698. <br /> Laboratory testing, moisture content verification, nuclear density testing, depth verification, and <br /> visual inspection of the SLF were performed by the CQA Monitor prior to approval for <br /> geomembrane deployment. If deficient areas of the SLF were encountered, the area was <br /> reworked and retested until the area was compliant with the project Technical Specifications.All <br /> SLF was inspected and approved by the CQA Monitor, CC&V, Tezak, and Tetra Tech prior to <br /> geomembrane deployment. SLF acceptance is discussed further in Section 3.2.3 and Section <br /> 3.4.2. SLF acceptance forms are provided in Appendix E. <br /> 2.6. Geomembrane <br /> Tetra Tech installed approximately 1,739,843 square feet of 80 mil LLDPE DSMS geomembrane <br /> within the Squaw Gulch VLF Phase 2A Part 2 area as shown on Record Drawing No. 10.The edge <br /> of geomembrane along the eastern end of the project limits, which will tie in with future <br /> construction phases, was protected by burying it within the SLF. <br /> Forklifts were used to transport and deploy the geomembrane panels parallel to the slopes to <br /> minimize stress on seams. Double-wedge fusion welding was the primary method of <br /> geomembrane seaming. Extrusion welding methods were used to perform tie-in seaming, defect <br /> repairs, and detail activities. Continuity conformance of fusion welded seams was performed <br /> using pressure testing methods, while extrusion welded seams and repairs were non- <br /> destructively tested using vacuum testing methods. Destructive testing was performed for both <br /> seaming types. The CQA Monitor observed and documented all geomembrane installation and <br /> repair activities. <br /> 2.7. Anchor Trench <br /> The geomembrane was anchored at the limits of Phase 2A Part 2 area in a minimum 2-foot wide <br /> and 3-foot deep anchor trench. Once non-destructive testing and repairs were completed and <br /> approved, the anchor trench was backfilled by Tezak in accordance with the project Technical <br /> Specifications. The backfill material was placed in 12-inch thick lifts and compacted by a smooth <br /> drum vibratory compactor. In areas where future geomembrane installation would cover the <br /> anchor trench, SLF was used to backfill the top 12 inches of the anchor trench. <br /> 2.8. High Volume Solution Collection System (HVSCS) Piping <br /> Record Drawings No.6 through 9 present the as-built layouts of the HVSCS piping installed within <br /> the Squaw Gulch VLF Phase 2A Part 2 area. IFC Drawings A70 and A74 present the HVSCS layout <br /> and detail, respectively. <br /> P:\Projects\Cert Report-Phase 2A Part 2\475.0106.032 CCV PHASE 2A Part 2 ROC REPORT.docx <br /> Page 5 <br />