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than one quarter inch) of 36.5 percent. The weight of spoil in the <br />• mine plan area averages 4,517,333 pounds per acre foot. This amounts <br />to a mulching application. equivalent to 824 tons of rock mulch <br />(fragments larger than one quarter inch). According to the erosion <br />control factors described by Clyde, et al. (1978) stone mulch rates <br />above 800 tons per acre are more effective in controlling erosion than <br />a corresponding straw mulch rate of 8 tons per acre. <br />The structural properties of the overburden, therefore, provide the <br />most effective means of controlling erosion. The possibility of <br />weathering of these spoils between the time they are regraded and the <br />topsoil applied is negligible. Even when exposed to weathering, no <br />statistical differences could be found in ph}~sical integrity as spoil <br />age increased. These data are documented in Table 1C~, Percent Size of <br />k'eathered Spoil According To Age. <br />In accordance with the topsoil redistribution plan set forth in Section <br />78C.18 (b), Energy Fuels will apply topsoil salvaced in advance of <br />• mining to the regraded spoil. The desirable mulching properties of <br />topsoil in terms of erosion control, moisture conservation, and plant <br />establishment are thoroughly documented in Section 780.18 (b). <br />Reclamation techniques utilized at CYCC will continue to provide <br />topsoil stabilization. As previously described, portions of Eckman <br />Park will be topsoiled with material that has been treated with the <br />hladge - Rotoclear. Such materials Hill contain a large percentage of <br />woody material, incorporated into the topsoil. The rotocleared Topsoil <br />not only acts as a mulch but also provides seed and root material for <br />vecetative establishment. <br /> <br />816-150 F.evised C4/22/87 <br />