2016-10-21_REPORT - M1980244 (31)

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Cripple Creek & Victor Gold Mining Company Squaw Gulch VLF Phase 1 Completion Record of Construction Report 475.0106.006 October 14, 2016 P:\Projects\0106.006 CC&V CQA and EDS\J‐REPORTS\ROC Report\475.0106.006 CCV PHASE 1 ROC REPORT ‐ FINAL161014.DOCX Page 6 2.7. Soil Liner Fill Approximately 101,690 cy of SLF was placed within the Squaw Gulch VLF Phase 1 Completion area. The as‐built SLF surface is presented in Record Drawing No. 2. Materials from the Cameron borrow and WHEX pit were processed through a custom‐designed rotary mill and screen in order to remove oversized rock and uniformly condition the material. After processing, the SLF was stockpiled in designated stockpiles around the site. Ames used CAT 740 articulated haul trucks to haul SLF from the local stockpiles to the Squaw Gulch VLF Phase 1 footprint. The material was spread using CAT LGP dozers equipped with GPS, and moisture conditioned in place by tandem‐axel water trucks and laborers. CAT 10‐ton smooth drum vibratory compactors and vibratory plate compactors were utilized to compact the SLF to a minimum thickness of 12 inches. The specified minimum density was 95 percent of the maximum dry density at minus 2 percent to plus 3 percent of optimum moisture content as determined by ASTM D698. Laboratory testing, moisture content verification, nuclear density testing, depth verification, and visual inspection of the SLF were performed by the CQA Monitor prior to approval for geomembrane deployment. If deficient areas of the SLF were encountered, the area was reworked and retested until the area was compliant with the project technical specifications. All SLF was inspected and approved by the CQA Monitor, CC&V, Ames and ECA prior to geomembrane deployment. SLF acceptance is discussed further in Section 3.2.5 and Section 3.4.2. SLF acceptance forms are provided in Appendix E. 2.8. Geomembrane ECA installed approximately 2,729,600 square feet of 80 mil LLDPE DSMS geomembrane within the Squaw Gulch VLF Phase 1 Completion area as shown on Record Drawing No. 6. Due to an insufficient inventory of 80 mil LLDPE DSMS geomembrane, the last thirteen panels (P‐2486 through P‐2498) of geomembrane that were installed consisted of 100 mil single sided textured (approximately 7,000 square feet) and 100 mil smooth (approximately 9,000 square feet) LLDPE geomembrane. The 100 mil LLDPE geomembrane was the excess material that had been approved for use within the Pregnant Solution Storage Area (PSSA). The use of 100 mill geomembrane is discussed further in Section 4 of this report. Fork lifts were used to transport and deploy the geomembrane panels parallel to the slopes to minimize stress on seams. Double‐wedge fusion welding was the primary method of geomembrane seaming. Extrusion welding methods were used to perform tie‐in seaming, defect repairs, and detail activities. Continuity conformance of fusion welded seams was performed using pressure testing methods, while extrusion welded seams and repairs were