2019-09-30_REVISION - M1980244 (5)

Home Browse Search

Cripple Creek&Victor Gold Mining Company ■ Squaw Gulch VLF Phase 2A Part 2 ■ Record of Construction Report 475.0106.032 September 30,2019 3.3.4. Geomembrane Welding Rod QC Certificates AGRU America manufactured the extrusion welding rod for the Squaw Gulch Phase 2A Part 2 VLF from various resin lots.The CQA Monitor reviewed and verified that all welding rod QC certificates that were provided by Chevron Phillips Chemical Company met the project Technical Specifications and was manufactured using the same type of resin.The welding rod QC certificates are presented in Appendix 1.5. 3.3.5. Geotextile QC Certificates Skaps Industries manufactured the 12 oz/yd2 non-woven geotextile that was used to construct the underdrain systems and leak detection trenches.The CQA Monitor verified that the geotextile QC certificates, presented in Appendix 1.6, met the project Technical Specifications. 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 pressure 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 Tetra Tech 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. 10 shows panel locations,seams, and destructive test locations. 3.4.1. Geomembrane Third Party Conformance Testing Third party conformance test samples for geomembrane 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 P:\Projects\Cert Report-Phase 2A Part 2\475.0106.032 CCV PHASE 2A Part 2 ROC REPORT docx Page 11