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•~ <br />---- ~~ <br />^ III IIIIIIIIIIIII III ~,T~,,. ~~ ~~~ <,~.,,r,<~ „~, ,,,,,,~, ~,...,.,r~ ~ ............. <br />ggg DEPARTMENT OF NATURAL gESOURCES <br />D. Monte Pascoe, Esecuirve Director <br />MINI~:U LAND I{EI:LA111A'I'ION <br />423 Centennial Building, 1313 Sherman Street <br />--_ ~~ ~-~ Denver, Coloratlo 80203 Tel. (303) 839-3567 <br />David C. Shelton <br />Director <br />October 26, 1981 <br />Mr. Larry E. O'Brian <br />Environment, Inc. <br />9989 West 60th Avenue <br />Arvada, Colorado 80004 <br />Dear Mr. O'Brian: <br />~,r:~ <br />I have reviewed the above application for adequacy and have the following <br />questions, comunents, and suggestions which are intended to aid you in <br />bringing this application into Full compliance with the law and to the <br />satisfaction of the Mined Land Reclamation Board. Please address each of <br />the following items in detail: <br />1. She staff requests that the proposed pit floor be left somewhat irregular <br />subsequent to mining in order to a11ot.~ for suitable aquatic habitat. If <br />bedrock is encountered, sufficient material should be left or added to <br />the pit floor in order to create durable irregularities. <br />2. The staff cautions the operator to assess the proposed bac}:fill plan <br />prior to or during the initial backfill stages. Depending upon the maCerials <br />used, method and degree of compaction, and degree of saturation of the final <br />fill, slope failures due to slumping, piping, sliding or failures due to <br />other forces could occur. Such failures could jeopardize the reclaimed <br />slopes and planned buffer between the pond and the Colorado River. Zf slope <br />failure potential proves likely, or should slope failure occur in initial <br />stages of backfilling, the operator should discard the backfilling concept <br />in favor of slopes created during erca va tion. <br />3. The staff requests that the operator maintain a strip of vegetation <br />between the proposed loading area and the Colorado River of sufficient width <br />to effectively filter silt from on-site runoff, and to maintain streambank <br />stability. <br />4. Please include a scale L`or the maps submitted in the application. <br />5. The operator is encouraged to utilize mulch on critical slopes and <br />porous soils in order to reduce erosion and conserve soil moisture. hfulch <br />is also advisable on areas where surface crusting is inhibiting plant <br />emergence. <br />