2019-09-30_REVISION - M1980244 (5)

Home Browse Search

Cripple Creek&Victor Gold Mining Company ■ Squaw Gulch VLF Phase 2A Part 2 ■ Record of Construction Report 475.0106.032 September 30,2019 All HVSCS piping was installed on approved geomembrane and kept in place during DCF placement. Approximately 24,349 linear feet of 4-inch diameter perforated CPeP, 1,089 linear feet of 8-inch diameter perforated CPeP, 3,900 linear feet of 12-inch diameter perforated CPeP, and 454 linear feet of 15-inch diameter perforated CPeP was installed. 2.9. Drain Cover Fill Approximately 128,860 cy of DCF was placed within the Squaw Gulch VLF Phase 2A Part 2 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 Y2 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 2 footprint. The DCF was placed in a 2-foot lift on approved geomembrane by LGP dozers.The DCF as-built boundary is shown on Record Drawing No. 11. 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. A CCIA Monitor was present during all DCF placement activities to verify that the DCF was placed in accordance with the project Technical Specifications and that no damage to the geomembrane occurred. If any damage to the geomembrane was noted, work activities were paused, and the damage was repaired prior to resuming DCF placement. The DCF As-Built Isopach is shown on Record Drawing No. 11. 2.10. Miscellaneous After geomembrane was approved and DCF was placed within the eastern end of the project, a mine haul truck mistakenly drove approximately 1,300 feet into the project limits before it was stopped. The haul truck was guided back out along its path with the assistance of a spotter. The extents of the haul truck's path were surveyed and a buffer was added to cover approximately one and a half times the width of the haul truck. All geomembrane within this designated area was removed and replaced.The CQA Monitor observed both the removal of DCF from the surface and the exposure of geomembrane. As the geomembrane within the designated area was removed,the underlying SLF was inspected,tested, and re-approved prior to replacing with new geomembrane. All geomembrane installation within this area was documented and is included in Appendix J. The CQA Monitor then observed the replacement of DCF over the geomembrane. P:\Projects\Cert Report-Phase 2A Part 2\475.0106.032 CCV PHASE 2A Part 2 ROC REPORT.docx Page 6