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Section 816.71 (b) Continued. <br />• <br />See Section 779.14 (b) (1) (iv) with respect to the chemical char- <br />acteristics of the overburden and Item 4 of the recommendations in <br />Exhibit 9, Excess Spoil, for the physical characteristics of the <br />samdstone. The drains will be constructed to a minimum of 16 feet <br />wide and 16 feet high. <br />•. <br />(c) Spoil shall be hauled or conveyed and placed in a controlled manner <br />and concurrently compacted as specified by the regulatory authority, in <br />lifts no greater than 4 feet or less if required by the regulatory <br />authority to -- <br />(1) Achieve the densities designed to ensure mass stability; <br />(2) Prevent mass movement; <br />(3) Avoid contamination of the rock underdrain or rock core; and <br />(4) Prevent formation of voids. <br />The spoil material which will be placed in the fill will be <br />excavated from the boxcuts using the Pfarion 204 Shovel. The <br />spoil will be hauled to the disposal area in rear end dump <br />trucks which will dump the spoil in lifts no greater than 4 feet. <br />The trucks and dozers will compact the fill to approximately 90% of <br />AASHTO T-99 density to ensure its stability. <br />(d) Surface water runoff shall be diverted away from the fill and into <br />stabilized diversion channels designed to pass safely the runoff from a <br />100-year, 24-hour precipitation event or larger event specified by the <br />regulatory authority. Surface runoff from the fill surface shall be di- <br />verted to stabilized channels off the fill which Y:ill safely pass the <br />runoff from a 100-year, 24-hour precipitation event. Diversion design <br />shall comply with the requirements of Section 816.43(f). <br />• <br />816-97 <br />