2016-01-14_REPORT - M1980244 (15)

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Cripple Creek & Victor Gold Mining Company Squaw Gulch VLF Phase 1 (9,550-foot Elevation Bench to Geomembrane Panel P1635) Final Report Quality Assurance Monitoring & Test Results January 2016 Project No.: 74201125N0 Page 26 Trial Seam Monitoring ECA performed trial seams to monitor the performance of the seaming apparatus and operator under actual site conditions. Each welding operator and his apparatus produced trial seams prior to the beginning of each day's seaming operation, after all work activity stoppages, and in the event that devices were disconnected from power and re-energized. ECA cut 1-inch-wide samples (coupons) from each trial seam and tested the coupons with a field tensiometer. ECA tested each double wedge fusion trial seam twice for peel adhesion (peel) and once for bonded seam strength (shear). Tests were conducted on fusion welds on both the inner and outer tracks of each peel coupon. ECA tested each extrusion trial seam twice for peel and once for shear. Amec Foster Wheeler personnel observed trial seam sample testing and documented test results. Tensile testing of each trial seam coupon was observed to verify project yield strengths were met during shear testing and failure did not occur in the weld during peel testing. When trial seams did not meet project technical specifications, Amec Foster Wheeler verified the welding apparatus was not used until two consecutive trial seams performed by the same technician/apparatus combination met project technical 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. Seaming Observations Amec Foster Wheeler 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 dry and clean of any debris. A minimum overlap of 3 inches is specified by Agru to achieve an acceptable weld and allow for successful destructive and non- destructive testing. Amec Foster Wheeler documented ECA personnel performing the seaming and the seaming equipment used. Following the completion of seaming and repairs, Amec Foster Wheeler checked the full length of each seam to verify no additional repairs were required. In the event additional repairs were needed, the location was marked on the geomembrane, location documented, and ECA completed the repair. Once ECA completed repairs, an Amec Foster Wheeler representative verified the repair met project technical specifications. All seams were inspected for quality and completion. Amec Foster Wheeler personnel conducted a final walk through and inspection of the geomembrane surface and completed acceptance forms to verify completion of