2021-03-02_REVISION - M1990057 (5)

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The Leadville Mill M 1990-057 EXHIBIT C—MILL PLAN Page 4-30 • Liner material contractor will inspect the substrate and anchor trenching prior to commencing installation. • Panel installation will occur in reasonably clam weather conditions with ambient temperatures in excess of 407 and no precipitation. • Sample seams will be made on a daily basis to establish a proper film bond tear. • Seaming crews will overlap the material ±6in and construct a minimum tin wide fully bonded seam without wrinkles or voids. • If wrinkles occur, the seam will be cut and patched accordingly, a minimum of 4in beyond the problem seam in all directions. • Field seams will be tested by the air-lance method per ASTM Method D4437. Where visual or audible signs occur, the area will be repaired. • Destructive samples will be taken every 1,000 liner-feet of seam from the material in the trench area. At least 2 samples will be taken if less than 2,000If of seam installed. • Destructive samples will be sent to a lab for testing (peel and shear). The test values will be a minimum of 80% of parent material strength. • The liner contractor shall supply daily reports to the Owner. LINER STABILIZATION, HISTORIC TAILINGS PLACEMENT. SLOPE BALLAST INSTALLATION • Performed by Owner, monitored by Mill Superintendent and/or Owner's Engineer. TAILINGS SLURRY PIPING. DECANT WATER PUMPS • Performed by Owner, monitored by Mill Superintendent and/or Owner's Engineer. 4.3. 10 CONSTRUCTION SCHEDULE (6.3.3(2)(b)) The following activities will be completed in the Spring 2021. The proposed construction schedule for the TSF follows. Reference QA/QC plan for additional details on the listed activities. UMC will provide the Division 48hr notice on the CORMS inspections. UMC will also provide the Division 48hr notice on the optional