Laserfiche WebLink
1 Western Slope Carbon, Inc. Page 12 <br />December 15, 1981 <br />1 <br />' by Items 1 and 2 above and stockpile for use in engineered <br />fill. <br />' a. Where fills are to be placed on natural slopes <br />equal to or flatter than 6:1, scarify and compact <br />' the upper six inches of the exposed soil and/or <br />weathered rock and in areas of depressions created <br />by the actions taken under Items 1 through 3 above. <br />' This requirement may be waived where competene rock <br />is exposed by the excavation. Place compacted back- <br />' fill in any depressions created using the stockpiled <br />on-site soils. <br />' b. Where fills are to be placed on natural slopes steeper <br />' than 6:1, prepare the area by constructing horizontal <br />benches into firm natural soils or rock. The benches <br />should be at least eight feet or more in width, with <br />a vertical step of at least two feet between benches. <br />The initial bench at the toe of each fill should be <br />keyed at least five feet into rock or other competent <br />material. <br />' 4. In areas where competent Mancos shale is not exposed, form an im- <br />' permeable liner by placing and compacting the stockpiled on-site <br />materials in level layers not exceeding eight inches in loose thick- <br />' ness. The liner material should be moisture conditioned to near <br />optimum and should have a total thickness of at least two feet. <br />' S. Place and compact the coal processed waste in level layers not <br />exceeding 24 inches in loose thickness. Successively place the <br />1 compacted waste up to the designed grade. <br />' 6. Place and compact a final four foot minimum thickness cover of <br />on-site topsoil material over the compacted waste. The cover <br />