2020-07-08_REVISION - M1980244 (20)

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Cripple Creek&Victor Gold Mining Company Squaw Gulch VLF Phase 2A Part 3 Record of Construction Report ■ 475.0106.032 July 2,2020 destructively tested using vacuum testing methods. Destructive testing was performed for both seaming types. The CQA Monitor observed and documented all geomembrane installation and repair activities. 2.6. Anchor Trench The geomembrane was anchored at the limits of Phase 2A Part 3 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 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. 2.7. High Volume Solution Collection System (HVSCS) Piping High Volume Collection Pipe As-Built record of construction drawings present the as-built layouts of the HVSCS piping installed within the Squaw Gulch VLF Phase 2A Part 3 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 3,100 linear feet of 4-inch diameter perforated corrugated polyethylene pipe (CPeP) and 277 linear feet of 15-inch diameter perforated CPeP were installed. 2.8. Drain Cover Fill Approximately 22,452 cy of DCF was placed within the Squaw Gulch VLF Phase 2A Part 3 area in accordance with the project Technical Specifications. Crushed overburden and crushed ore were both used for drain cover fill placement. 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. Crushed ore material was processed in June 2020. Durable ore was sent to the crusher which processed the ore to the 3 inch-minus technical specification. 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 3 footprint. The DCF was placed in a minimum 2-foot lift on approved geomembrane by LGP dozers.The DCF as-built boundary is shown on Record Drawing No. 6. Haul routes consisted of 4-foot lifts that were spread into 2-foot lifts upon finish grading the area. Haul routes consisting of the crushed ore DCF were left in place. All DCF was placed in an uphill direction on slopes steeper than 4HAV using dozers with GPS capability. P:\Projects\0106.032 VLF2 Phase 2 CQA\1-REPORTS\Cert Report-Phase 2A Part 3\475.0106.032 CCV PHASE 2A Part 3 ROC REPORT.docx Page 6