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,,a <br /> <br />• <br />TRAPPER MINING zNC. <br />May 7, 1987 <br />CERTIFIED P577401548 <br />Mr. Gregg Squire <br />Colorado Mined Land Reclamation Division <br />423 Centennial Building <br />1313 Sherman Street <br />Denver, CO 80203 <br />Dear Gregg: <br />Enclosed is a diagram showing erosion control test plot locations and the <br />various materials to be used in Coyote Drainage in 1987. Several erosion con- <br />trol materials were installed in 1986 on a trial basis to reduce cutting in <br />Ch is reconstructed drainageway. At this point this is only a test and we <br />would rather not modify our permit until results can be evaluated. Erosion <br />control materials proposed for use in 1987 are downstream of the 1986 plots <br />and include the following materials: <br />1) Brush apron. Brush removed from adjacent stripped areas will be placed <br />into the drainage bottom and compacted so as to retard water flow, enhance <br />.sedimentation and eliminate cutting. <br />2) C125 coconut fiber blanket will be placed in the regraded drainage channel <br />to enhance sedimentation and prevent bottom cutting. <br />3) Landglas erosion control fiber will be installed in the regraded drainage <br />channel and will include a topsoiled and non-topsoiled treatment. In <br />accordance with our permit (page 4-181), drainage bottoms will not be top- <br />soiled due to probable topsoil washing. However, with the use of a proven <br />erosion control material, the topsoil should be stabilized and will provide <br />a better plant growth medium to increase vegetation cover and further <br />reduce channel cutting. <br />4) Rock riprap structures with erosion control cloth will be installed at the <br />head and toe of each treatment and in critical areas in the drainageway <br />(see x-section diagram). <br />After construction, drainage channels will be seeded with appropriate annual <br />and/or perennial grasses, fortis and shrubs. If annual grasses are used, the <br />drainage channel shall be treated (for example, mowed or sprayed) so annuals <br />do not form seed heads, or sterile varieties will be used. <br />Gregg, the installation of these treatments will provide valuable information <br />as to what erosion control materials are best suited for use at Trapper Mine <br />• III IIIIIIIIIIIIIIII <br />999 <br />R~C~~VE® <br />MAY 111981 <br />MINED LAND <br />RECLAMATION DIVISION <br />cont. <br />P.0. Box 187 <br />Craig, Colorado 81626 <br />(303) 824-4401 <br />