2011-09-16_REVISION - M1990057 (9)

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• Soils engineer to observe, segregate suitable embankment material, and test placement of embankment fill during construction. Clay Material Segregation and Clay Liner Construction • Performed by contractor, monitored by Mill Superintendent and/or Owner's Engineer. • Soils engineer to segregate suitable clay liner material while observing placement of embankment fill during construction. • Grade top of clay liner on interior slope and bottom of impoundment ( +/- 1") on 50' grid. • Monitor clay liner compaction lifts, compaction equipment in conjunction with contract soils engineer. • Soils engineer to test placement of clay liner compaction during construction. • One compaction test conducted for every 2,500cy of clay liner placed. Leak Detection and Sump Construction • Performed by contractor, monitored by Mill Superintendent and/or Owner's Engineer. • Layout and grade detection layer subdrain system. • Layout and grade detection layer collection sump system. • Grade top of detection layer on interior slope and bottom of impoundment ( +/- 1/8 ") on 50' grid. • Daily check of sub base for geomembrane liner placement. Impoundment Liner Installation • Performed by contractor, monitored by Mill Superintendent and/or Owner's Engineer. • Layout and grade anchor trench for geomembrane liner. • 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 40 degrees F 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 2in 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 1,0001f of seam from the material in the trench area. At least 2 samples will be taken if less than 2,0001f 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. Geotextile Liner Installation • Performed by contractor, monitored by Mill Superintendent and/or Owner's Engineer. • Layout geotextile liner on polypropylene liner on impoundment bottom. Panels will overlap adjacent panels lft. M1990 -057 September 16, 2011