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 16 3.4.8. Geomembrane Acceptance Prior to DCF placement, the geomembrane was accepted by ECA, Ames, CC&V, and the CQA Monitor. All CQA logs and survey data were thoroughly reviewed ensuring that all aspects of the geomembrane installation were performed in accordance with project technical specifications. Geomembrane Acceptance Forms are presented in Appendix J.8. 4. PROJECT DEVIATIONS Throughout construction, the following deviations from the design and IFC drawings were made.  NewFields reviewed and updated the project technical specifications to meet current industry standards. The project technical specification was sent to DRMS on July 7, 2016.  Several localized grading, underdrain alignment and HVSCS alignment changes were made throughout construction in order to better accommodate the actual site conditions. The grading changes were minor and are presented in the Record of Construction drawings.  IFC drawing A220 indicated that a fusion weld should be used between the phased geomembrane connections; however, the EOR approved the use of an extrusion weld instead.  The Phase 1 limits were intended to be on the north side of the Squaw Gulch VLF haul road. Due to haul traffic travel ways and a deferment of the Phase 2 construction, Phase 1 terminated along the south side of the Squaw Gulch VLF haul road. The Phase 1 limits followed the south edge of the haul road until the 10,050‐foot elevation. A bench was cut into the slope along the 10,050‐foot elevation in order facilitate ease of construction in that area. Approximately 15,000 square feet of area was eliminated from the Phase 1 area by not lining from the 10,050‐foot bench to the south edge of the haul road.  Adjustments to the HVSCS piping and barren line alignment were made by the EOR. The adjustments included, removing the 12‐inch CPeP perimeter pipe along the Mill tie in, re‐aligning the barren pipe along the Mill tie‐in, and the potential to decrease the two 24‐inch CPeP to 12‐inch CPeP. A “Solution Collection Piping Modifications” memorandum explaining the design changes is included in Appendix M.  A number of panels were deployed at the end of the 2015 construction season and were not covered with DCF material within the allotted 180 days. Conformance testing was completed on each of the six resin lots that were deployed during this time to verify that the geomembrane properties were still in compliance with the project technical specifications. Appendix K.5 presents the passing conformance testing results.