2014-01-17_REPORT - M1980244 (3)

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Cripple Creek & Victor Gold Mining Company Phase 5 Slide Repair Final Report Quality Assurance Monitoring & Test Results January 14, 2014 ameO the welding apparatus was not used until two consecutive trial seams performed by the same technician /apparatus combination met specifications. The trial seam test results for extrusion and fusion seaming are presented in Appendix J.2. ECA used one tensiometer during the project and one spare tensiometer was maintained on site. Tensiometer certifications are presented in Appendix L. Figures 3 and 4 show the codes used to designate passing and failing test results. 6.3.2 Seaming Observations AMEC personnel observed seams before, during, and after welding. Each seam was checked for adequate overlap prior to welding and to verify the seam area was clean and dry. AMEC documented which ECA technician performed the seaming and what seaming equipment was used. Following the completion of a seam and routine repairs, AMEC checked the full length of each seam to verify no additional repairs were required. In the event additional repairs were needed, AMEC marked the location requiring repair on the geomembrane, documented the location, and brought the repair area to the attention of ECA. Once ECA made repairs, AMEC checked the repair location to verify completion. All seams were inspected for quality and completion. AMEC personnel conducted a final walk through to verify completion of the entire geomembrane system and to identify any additional damage that may have occurred during construction operations. AMEC recorded observations made during seaming for the Phase 5 Slide Repair geomembrane met project specifications and a summary is presented in Appendix J.3. 6.4 Defect and Repair Observations AMEC inspected geomembrane panels for damage that may have occurred during manufacture, transport, deployment, or installation as discussed in Section 6.0 of this report. Any damage noted (during or after deployment) was reported. AMEC repeatedly observed all panels and seams for defects until Ames covered the geomembrane with DCF. Defects were documented by assigning a unique defect identification code to each defect, and marked each defect code on the geomembrane. The summaries of defects and repairs, including the approximate locations of each repair, are presented in Appendix J.4. 6.5 Destructive Testing AMEC selected destructive test locations based on ECA's completion of approximately 3,669 lineal feet of welding for the geomembrane, various working conditions, and on seaming observations (e.g., suspicion of a defective weld). AMEC obtained and tested s:\projects \1568 cc &v -ph v slide repair cqa \11.0 certification report\cc &v roc report. docx 14