Laserfiche WebLink
Cripple Creek&Victor Gold Mining Company <br /> Squaw Gulch VLF Phase 2A Part 3 <br /> Record of Construction Report . <br /> 475.0106.032 <br /> July 2,2020 <br /> for each panel, and measured the thickness of the panel edges. Roll numbers were <br /> checked against the site inventory to ensure only approved geomembrane was deployed. <br /> The Geomembrane Panel Deployment Summary is presented in Appendix J.1. <br /> 3.4.3. Geomembrane Fusion Seaming <br /> Double-wedge fusion welding was the primary method of geomembrane seaming for the <br /> Squaw Gulch VLF Phase 2A Part 3 project. Prior to fusion welding activities, trial welds <br /> were performed for each welding machine and welding technician combination for each <br /> type of geomembrane.The fusion welding trial seam logs are presented in Appendix J.2.1. <br /> The weld was inspected constantly for insufficient overlap, burnouts, or any other <br /> damage caused during the welding process. The CQA Monitor logged the welding <br /> machine and welding technician combination, the length of the seam, the direction the <br /> seam was welded, time of seaming, the welding machine temperature, and the welding <br /> machine speed. Destructive test samples were marked during fusion seaming and are <br /> discussed further in Section 3.4.5. Continuity conformance of the seam was also <br /> performed using pressure testing methods and is discussed further in Section 3.4.6. The <br /> Geomembrane Fusion Welding Summary is presented in Appendix J.3. <br /> 3.4.4. Geomembrane Extrusion Seaming <br /> At each construction bench, the deployed geomembrane was tied-into the previously <br /> placed geomembrane, overlapping a minimum of two feet. The tie-in was welded using <br /> extrusion welding methods. Any damage caused to the existing geomembrane, at the <br /> Phase 1 tie-in as it was exposed, was repaired by extending the overlap of new liner or by <br /> completely covering the damaged area with a patch. Prior to extrusion seaming activities, <br /> trial welds were performed for each welding machine and welding technician <br /> combination for each type of geomembrane. The trial seam logs are presented in <br /> Appendix J.2.2. As extrusion seaming was performed, proper techniques were verified <br /> including welding angle, grinding, and weld/welding rod cleanliness. The CQA Monitor <br /> logged the welding machine and welding technician combination,the length of the seam, <br /> the direction the seam was welded, time of seaming, the pre-heat temperature, and the <br /> welding temperature. Destructive test samples were marked during extrusion seaming <br /> and testing is discussed further in Section 3.4.5. All extrusion welded seams were vacuum <br /> tested and is discussed further in Section 3.4.7. The Geomembrane Extrusion Welding <br /> Summary is presented in Appendix J.4. <br /> 3.4.5. Geomembrane Destructive Testing <br /> During welding activities destructive test samples were marked at a minimum every 500 <br /> linear feet of seam for each welding type and each welding machine/welding technician <br /> P:\Projects\0106.032 VLF2 Phase 2 CQA\J-REPORTS\Cert Report-Phase 2A Part 3\475.0106.032 CCV PHASE 2A Part 3 ROC <br /> REPORT.docx <br /> Page 12 <br />