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 7 non‐destructively tested using vacuum testing methods. Destructive testing was performed for both seaming types. The CQA Monitor observed and documented all geomembrane installation activities. 2.9. Anchor Trench The geomembrane was anchored at the limits of Phase 1 in a minimum 2 foot wide and 3 foot deep anchor trench. Once non‐destructive testing and repairs were completed and approved, the anchor trench was backfilled by Ames in accordance with the project technical specifications. The backfill material was placed in 12 inch thick lifts and compacted by a vibratory plate compactor, “Jumping Jack” compactor, or a smooth drum vibratory compactor. In areas where future geomembrane installation would cover the anchor trench, SLF was used to backfill the top 12 inches of the anchor trench. 2.10. High Volume Solution Collection System (HVSCS) Piping Record Drawing No. 4 presents the as‐built layout of the HVSCS piping installed within the Squaw Gulch VLF Phase 1 Completion area. IFC Drawings A400 and A410 present the HVSCS layout and detail, respectively. All HVSCS piping was installed on approved geomembrane and kept in place during DCF placement. Approximately 45,205 linear feet of 4‐inch diameter perforated CPeP, 1,930 linear feet of 8‐inch diameter perforated CPeP, 1,360 linear feet of 12‐inch diameter perforated CPeP, 600 linear feet of 15‐inch diameter perforated CPeP, 80 linear feet of 18‐inch diameter perforated CPeP, 2,900 linear feet of 24‐inch diameter perforated CPeP was installed. 2.11. Drain Cover Fill Approximately 203,380 cy of DCF was placed within the Squaw Gulch VLF Phase 1 Completion area in accordance with the project technical specifications. Crushed overburden material from the Cresson Project was processed between September 2013 and November 2014. All oversized material was removed from the overburden by screening the material over a vibrating 1 ½ inch screen. After processing, the DCF was stockpiled in a local stockpile designated by CC&V located north of the Squaw Gulch VLF. Ames used CAT 740 articulated haul trucks to haul DCF from the stockpile to the Squaw Gulch VLF Phase 1 footprint. The DCF was placed in a 2‐foot lift on approved geomembrane by LGP CAT dozers. Haul routes consisted of 4‐foot lifts that were spread into 2‐foot lifts upon finish grading the area. All DCF was placed in an uphill direction on slopes steeper than 4H:1V. Ames’ laborers placed polyvinyl chloride (PVC) grade markers at all grade breaks and on a maximum 50 foot wide by 50 foot long grid when a dozer without GPS capability was placing DCF. A