2014-01-17_REPORT - M1980244 (3)

Home Browse Search

Cripple Creek & Victor Gold Mining Company Phase 5 Slide Repair Final Report Quality Assurance Monitoring & Test Results January 14, 2014 ameO AMEC personnel measured deployed panel lengths by use of a measuring wheel. Recorded lengths were approximate, and do not reflect any trimming or adjustments made for final placement or anchor trench lengths. AMEC personnel observed the surface of each deployed panel and logged any penetration defects and marked them on the panel. Section 6.4 of this report provides further discussion of repairs. The overlap of each panel with adjacent panels to verify that sufficient overlap for seaming existed was observed. AMEC logged insufficient panel overlaps as defects and marked them for correction. Ames surveyed all panel intersections and destructive seam sample locations. Using these points, AMEC has provided the Geomembrane Panel As -Built as Sheet 3 of 3 in Appendix A. The geomembrane deployment observations associated with the Phase 5 Slide Repair are presented in Appendix J.1. 6.3 Seaming The double wedge fusion weld was the principal seaming method employed by ECA for this project. ECA fusion seamed (welded) geomembrane on the same day that it was deployed. Extrusion welds were used for seaming where the new geomembrane was tied into the existing geomembrane, for repairs, and where conditions were unfavourable for fusion welding (e.g., sharp corners). AMEC observed trial seam tests, monitored seaming equipment temperatures and speed, and provided visual observation of the seaming procedures. The entire lengths of all seams, patches, and other repairs during seaming were documented and inspected. 6.3.1 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 interruptions, 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 for both the inner and outer tracks of each peel coupon. ECA tested each extrusion trial seam twice for peel and once for shear. AMEC personnel observed the testing of trial seam samples and documented test results. Tensile testing of each trial seam coupon was observed to verify that the 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 specifications, AMEC verified sAprojects \1568 cc &v -ph v slide repair cqa \11.0 certification report\cc &v roc report. docx 13