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6.4.5 Exhibit E — Reclamation Plan <br />h) Large rocks (greater than 2 inches) will be removed from the soil liner fill. <br />Soil clods larger than 4 inches will be broken up. <br />Construction Procedure <br />A detailed construction procedure is given here to develop the basis for quality <br />assurance and provide the operators with a step by step schematic plan that will <br />guarantee a quality compacted liner. <br />Maintaining the proper moisture content will be critical to ensure adequate <br />compaction. It is highly recommended that the specified moisture content be <br />achieved prior to removing the shale from the pit floor. An area of pit floor shall <br />be disked, watered, then allowed to sit for a until moisture content stabilizes <br />(approximately 24 hours) before stripping and placing clay liner material. Field <br />testing shall be performed during construction by a qualified geotechnical <br />engineer and shall consist of moisture content testing prior to excavation of <br />borrow material as well as moisture content and density of the compacted lifts at <br />least once every 10,000 yd <br />A backhoe will be used to dig a trench or keyway into bedrock. Weathered shale <br />will be backfilled and compacted into the keyway as described below. A <br />conceptual cross section of the liner is given in Exhibit F, Typical Cross Section. <br />Weathered Pierre shale removed from the pit bottom will then be placed along <br />the perimeter of the pit to construct the compacted clay liner. Shale will be <br />placed in 1 -2 foot lifts. A Scraper should be used both for stripping and placing <br />the shale into lifts followed by the sheep's -foot roller /compactor. Each 1 -2 foot lift <br />shall be compacted to 95% of maximum density as determined by the Proctor <br />test. Field testing shall occur at least once every 10,000 yd A dewatering gap <br />shall be left open between the liner construction and pit wall to insure each liner <br />lift does not come into contact with local groundwater. The dewatering gap can <br />be backfilled as the liner progresses vertically, however it is not required that this <br />fill be compacted or tested. <br />Topsoil Replacement <br />All disturbed areas within the permit area (excluding portions of the ponds <br />submerged by the normal pool elevation) total approximately 37 acres. All <br />disturbed areas will be reclaimed to pasture grass by disking and placing topsoil <br />to a thickness of 8 ". A total of approximately 40,333 cy of topsoil will be required <br />for this purpose. <br />