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• Monitor compaction lifts, compaction equipment in conjunction with contract <br />soils engineer. <br />• Soils engineer to observe, segregate suitable embankment material, and test <br />placement of embankment fill during construction. <br />Clay Material Segregation and Clay Liner Construction <br />• Performed by contractor, monitored by Mill Superintendent and/or Owner's <br />Engineer. <br />• Soils engineer to segregate suitable clay liner material while observing placement <br />of embankment fill during construction. <br />• Grade top of clay liner on interior slope and bottom of impoundment ( +/- 1") on <br />50' grid. <br />• Monitor clay liner compaction lifts, compaction equipment in conjunction with <br />contract soils engineer. <br />• Soils engineer to test placement of clay liner compaction during construction. <br />• One compaction test conducted for every 2,500cy of clay liner placed. <br />Leak Detection and Sump Construction <br />• Performed by contractor, monitored by Mill Superintendent and/or Owner's <br />Engineer. <br />• Layout and grade detection layer subdrain system. <br />• Layout and grade detection layer collection sump system. <br />• Grade top of detection layer on interior slope and bottom of impoundment ( +/- <br />1/8") on 50' grid. <br />• Daily check of sub base for geomembrane liner placement. <br />Impoundment Liner Installation <br />• Performed by contractor, monitored by Mill Superintendent and/or Owner's <br />Engineer. <br />• Layout and grade anchor trench for geomembrane liner. <br />• Liner material contractor will inspect the substrate and anchor trenching prior to <br />commencing installation. <br />• Panel installation will occur in reasonably clam weather conditions with ambient <br />temperatures in excess of 40 degrees F and no precipitation. <br />• Sample seams will be made on a daily basis to establish a proper film bond tear. <br />• Seaming crews will overlap the material + / -6in and construct a minimum 2in wide <br />fully bonded seam without wrinkles or voids. <br />• If wrinkles occur, the seam will be cut and patched accordingly, a minimum of <br />4in beyond the problem seam in all directions. <br />• Field seams will be tested by the air -lance method per ASTM Method D4437. <br />Where visual or audible signs occur, the area will be repaired. <br />M1990 -057 September 27, 2011 <br />