2022-02-09_PERMIT FILE - M2021046 (4)

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amec foster wheeler Zephyr Gold USA Ltd. PAGE 8 OF 13 Dawson Gold Project Dawson Filtered Tailings Storage Facility SPECIFICATION SEC. NO.: 01400.2 Pre-feasibility Study TECHNICAL SPECIFICATIONS FOR DATE: (ORIGINAL) Fremont County, Colorado GEOSYNTHETICS CONSTRUCTION QUALITY 20-October-16 PROJECT NO.: 74201633 ASSURANCE(CQA) PLAN REVISION: A DATE: 20-Oct-16 • Subgrade surface acceptance certificates for each area to be covered by the lining system, signed by the INSTALLER. The CQA MONITOR shall: • Inspect all geosynthetic materials delivered to site. The CQA MONITOR(S) shall document any damage and notify the MANAGER. • Obtain geosynthetic packaging identification slips for verification and generation of an on-site materials inventory. • Observe subgrade conditions prior to geosynthetics installation and verify that any deficiencies are corrected. • Observe permanent anchoring of geosynthetics to verify that project SPECIFICATIONS are met. • Observe that the required overlap distances are met. • Monitor and record ambient air temperatures. • Verify that no continuous horizontal seams are placed on slopes unless approved by the ENGINEER. • Observe and document that ballast and any soil materials placed on top of the geosynthetics are done in such a manner as to ensure that the geosynthetics are not damaged. 7.1 GEOMEMBRANE During geomembrane installation, the CQA MONITOR(S) shall observe and document deployment, trial seams, field seaming, non-destructive and destructive seam testing, and repairs to assess that the installation is in compliance with the SPECIFICATIONS. Deployment - The CQA MONITOR(S) shall verify that only approved materials are used, each panel is given a unique panel number, no geomembrane is placed during unsuitable weather conditions, the geomembrane is not damaged during installation, and anchoring is performed in compliance with the SPECIFICATIONS and design DRAWINGS. The CQA MONITOR(S) shall record the deployment on the deployment log form. Trial Seams - The CQA MONITOR(S) shall verify that seaming conditions are performed in compliance with the SPECIFICATIONS, tests are performed at required intervals, specified test procedures are followed, and retests are performed in compliance with the SPECIFICATIONS. The INSTALLER shall perform trial seams at the beginning of each crew shift, and immediately following any Work stoppage (i.e., S:\ZEPHYR MINERALS\DRMS MINE APPLICATION\01400.2-GEOSYNTHETICS CQA.DOCX