2019-08-23_REVISION - M1980244 (5)

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Cripple Creek&Victor Gold Mining Company ■ Squaw Gulch VLF Phase 2A Part 1 ■ Record of Construction Report 475.0106.032 August 21,2019 2.9. Anchor Trench The geomembrane was anchored at the limits of Phase 2A Part 1 area 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 Tezak in accordance with the project Technical Specifications.The backfill material was placed in 12-inch thick lifts and compacted by a vibratory plate 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 Drawings (Post 2019) No. 6 through 8 present the as-built layouts of the HVSCS piping installed within the Squaw Gulch VLF Phase 2A Part 1 area. IFC Drawings A70 and A74 present the HVSCS layout and detail, respectively. All HVSCS piping was installed on approved geomembrane and kept in place during DCF placement. Approximately 6,784 linear feet of 4-inch diameter perforated CPeP, 475 linear feet of 8-inch diameter perforated CPeP, 1,375 linear feet of 12-inch diameter perforated CPeP, and 75 linear feet of 15-inch diameter perforated CPeP was installed. 2.11. Drain Cover Fill Approximately 60,632 cy of DCF was placed within the Squaw Gulch VLF Phase 2A Part 1 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 % inch screen. After processing, the DCF was stockpiled north of the Squaw Gulch VLF in an area designated by CC&V. Tezak used 30- and 40-ton articulated haul trucks to haul DCF from the stockpile to the Squaw Gulch VLF Phase 2A Part 1 footprint. The DCF was placed in a 2-foot lift on approved geomembrane by LGP dozers. Approximately 10 feet of offset was given leaving the geomembrane uncovered along the leading edge where access is necessary for future geomembrane tie-in.The DCF as-built boundary is shown on Record Drawing(Post 2019) No. 10. 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 using dozers with GPS capability. P:\Projects\0106.032 VLF2 Phase 2 CQA\J-REPORTS\Cert Report-Phase 2A Part 1\DRMS Comments\475.0106.032 CCV PHASE 2A Part 1 ROC REPORT_Revl.docx Page 8