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<br />1 <br />z <br />' <br /> Sectio n 715.15 of the Office of Surface Mining Interim <br />' Regulations (Federal Register, Vol. 42, No. 239, Tuesday, <br /> December 13, 1977) i nclude the following requirements for <br /> disposal of spoil in valley or head-of-hollow fills. <br />' <br />"(b)(7) Spoil shall be transported and placed in a <br />' controlled manner concurrently compacted as specified by <br />the regulatory authority in lifts that are less than 4 <br />feet t}iick in order to achieve the densities designed to <br />ensux•e mass stability, to prevent mass movement, to avoid <br />' contamination of the rock underdrains and to prevent <br />formation of voids..." <br />' In essence, our evaluation indicates that the current <br /> spoil placement procedures and final design configuration will <br />' result in a stable dump. Our general recommendations and <br /> conclusions are presented on page 7. <br />' <br /> Waste Dump Design Configuration <br />' ' <br /> f he design configuration of the dump was prepared by <br /> Tipton and Kalmback, Inc. A section through the final dump is <br />' d t <br />d <br />1 <br />A <br />l n <br />th <br />d <br />si <br />tabilit <br /> um <br />shown on Figure <br />. <br />s re <br />ate <br />o g <br />p s <br />y, <br />e <br />e <br /> includes: <br />1 <br /> 1. The overall slope will be 3 :1 with 30-foot-wide <br /> benches placed at 100 foot elevation intervals. <br />' 2. The toe of tl~e fill will be at elevation 6590 at a <br />distance of about 300 feet from State Higi~way 13, and <br />' extended at 3:1 to about elevation 7000. Fill will <br />he placed above elevation 7000 but at a slope much <br />' flatter than 3:1. <br />Golder Associates <br />