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Newmont Mining Corporation IBM <br /> Record of Construction Report ■ <br /> VLF2 Recertification Project <br /> Subgrade and Geomembrane 9650'—9750'Elevations <br /> NewFields Project No.475.0106.026 <br /> July 3,2018 <br /> 4.3. Geomembrane Resin QC Certificates <br /> AGRU America manufactured the geomembrane for the VLF2 Recertification Project by using <br /> LLDPE polymer raw material (resin). Chevron Phillips Chemical Company provided resin QC <br /> certificates at a rate of one per rail car shipment.The resin QC certificates were reviewed by the <br /> CQA Monitor, ensuring all materials met or exceeded the project technical specifications. The <br /> resin QC certificates for all geomembrane used within the VLF2 Recertification area are presented <br /> in Appendix D.4. <br /> 4.4. Geomembrane Welding Rod QC Certificates <br /> AGRU America manufactured the extrusion welding rod for the VLF2 Recertification Project from <br /> various resin lots. The CQA Monitor reviewed and verified that all welding rod QC certificates <br /> that were provided by Chevron Phillips Chemical Company met the project technical <br /> specifications.The welding rod QC certificates are presented in Appendix D.S. <br /> S. GEOMEMBRANE QUALITY ASSURANCE <br /> CQA performed on installed LLDPE geomembrane consisted of visual observations of panel <br /> deployment, double-wedge fusion seaming, extrusion seaming, extrusion welded repairs, non- <br /> destructive testing, and destructive testing. Fusion welded seams were non-destructively tested <br /> for continuity using air testing methods. Extrusion welds were non-destructively tested using <br /> vacuum testing methods. Fusion and extrusion welding methods were also tested destructively. <br /> All field sampling and testing was performed by Comanco and observed by the CQA Monitor. <br /> Visual observations of field seams and panels were routinely made to inspect the seam for <br /> squeeze-out, melt, over-grind, and overlap. Defects and/or failed seams were marked and <br /> repaired in accordance with the specified repair procedures. <br /> Welding machines were continually inspected for proper operation, settings and condition by <br /> performing trial welds prior to actual geomembrane installation. Logs of the trial welds, panels, <br /> seams, continuity testing, repairs, and destructive testing were maintained by both the <br /> contractor and the CQA Monitor on a daily basis. The CQA Monitor's geomembrane installation <br /> logs are presented in Appendix E. <br /> All geomembrane installation for the VLF2 Recertification for subgrade and geomembrane <br /> between the 9650' and 9750' elevations project was performed in accordance with Technical <br /> Specifications. Drawing 2 shows panel locations, seams, destructive test locations, and existing <br /> geomembrane conformance sample locations. <br /> Page 8 <br />