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 13 3.4. Geomembrane Construction Quality Assurance CQA performed on installed LLDPE geomembrane consisted of visual observations of panel deployment, double‐wedge fusion seaming, extrusion seaming, extrusion welded repairs, non‐ destructive testing, and destructive testing. Fusion welded seams were non‐destructively tested for continuity using air testing methods. Extrusion welds were non‐destructively tested using vacuum testing methods. Fusion and extrusion welding methods were also tested destructively. All field sampling and testing was performed by ECA and observed by the CQA Monitor. Visual observations of field seams and panels were routinely made to inspect the seam for squeeze‐ out, melt, over‐grind, and overlap. Defects and/or failed seams were marked and repaired in accordance with the specified repair procedures. Welding machines were continually inspected for proper operation, settings and condition by performing trial welds prior to actual geomembrane installation. Logs of the trial welds, panels, seams, continuity testing, repairs, and destructive testing were maintained by both the contractor and the CQA Monitor on a daily basis. The CQA Monitor’s geomembrane installation logs are presented in Appendix J. All geomembrane installation for the Squaw Gulch VLF project was performed in accordance with design drawings and project specifications. Record Drawing No. 6 shows panel locations, seams, and destructive test locations. 3.4.1. Third Party Conformance Testing Third party conformance test samples were obtained at a rate of one test for every 150,000 square feet, and at least one test for each resin lot. Samples were tested by TRI in Austin, TX. All conformance test results were reviewed by a NewFields representative and met the technical specifications. Third party conformance test results are presented in Appendix K. 3.4.2. Geomembrane Panel Deployment The SLF surface was inspected by the CQA monitor prior to geomembrane deployment, ensuring the surface was free of any protruding rock greater that 0.75” or irregularities (rutting, ridges, indentations, etc.) greater than 0.5”. The SLF surface was approved by ECA, Ames, CC&V, and the CQA Monitor prior to and during deployment each day. SLF acceptance forms are presented in Appendix E. During geomembrane panel deployment the CQA Monitor logged the dimensions of each panel, the roll number used for each panel, and measured the thickness of the panel edges. Roll numbers were checked against the site inventory to ensure only approved geomembrane was deployed. The Geomembrane Panel Deployment Summary is presented in Appendix J.1.