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<br />~..-_ <br />TUTTLE APPLEGATE RINDAHL, <br />Consultants for Land and Resource Development <br />Mr. Michael Boyd <br />Mined Land Reclamation Division <br />August 16, 1989 <br />Page 2 <br />Reclamation Plan (Exhibit E) <br /> <br />INC. <br />1. Assuming the rhyolite deposits vary from 10 to 20 feet and <br />the overburden has an average thickness of 6 feet, lowering <br />of the mining area during mining will be from 16 to 26 feet. <br />The re-application of overburden topsoil will result in a ~,~ <br />net lowering of the mesa top from 14 to 24 feet. It is our ~ <br />intention to commit to a redistribution of'iB inches of <br />overburden plus the topsoil. We feel this is an a e ate <br />amount to re-establish our final land use of grazing. <br />The possibility exists that the remainder of he overburden <br />can be sold as non-classified fill. In add~tion, some of <br />this overburden is clay material that may be suitable in <br />brick manufacturing. <br />2. Hydrology/Erosion Control Design - Please find enclosed <br />drainage and erosion information including peak discharges <br />and runoff volumes for the two, five, and 100 year design <br />'~" \ storm events. Peak discharges and velocities from drainage <br />~'s\ k~ outlet points will be reduced and controlled through the use <br />F~ `til of excavated sedimentation ponds and a riprap cutoff <br />~ti ~~ structure at each outlet point. Sediment siltation basins <br />~~ ,p' have been designed to retain a two-year storm event (typical <br />~ basin volume = 0.65 acre-feet). Riprap cutoff structures <br />have been designed to keep outlet flow velocities to less <br />than 5 feet oer second immediately prior to discharge onto <br />undisturbed areas. <br />These two sets of improvements will be the major erosion <br />control measures definitely to be used on the site. These <br />improvements address the most serious areas of concern <br />regarding erosion control. The operator will utilize other <br />erosion control measures detailed on application pages E-1 <br />through E-3 as necessary. It is intended that these <br />measures be instituted as needed if site conditions warrant. <br />Improvements would be selected from the available management <br />techniques and field-engineered to fit the specific problems <br />encountered. <br /> <br /> <br />