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~-~l <br />Richartl D. La <br />Governor <br />DEPARTMENT OF NATURAL RESOURCES <br />Davitl H. Getches, Eaecutrve Director <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTO N, Director <br />D TE: November 3, 1986 <br />T Stevan O'Brian <br />F OM: James B. M~d~ and Robert Carlson '~ <br />R File No. M-86-147 <br />Adequacy Items <br />T e following items must be addressed by the applicant in order to satisfy the <br />a plicable requirements of C.R.S. 34-32-101 et seq. Mineral Rules and <br />R gulations of the Mined Land Reclamation Board: <br />E hibit B - Minin Plan ,`~ fr ~.r.5 1~ <br />J, The submitted soils information i s i nconcl usi ve i n defining avai l abl a S=~ y%~ ~j0'~ •S• <br />~~ plant growth material present on-site. Please provide the staff with a~,v" +~`"Dd-1' <br />more accurate estimate (cubic yards) of salvagable topsoil material. ~~~~y~~~ <br />a <br />,I a. What is the source of this material? <br />Where will it be stockpiled? <br />How will the operator stabilize material stockpiles? <br />d. What criteria were used by the operator to arrive at a replacement <br />depth of 14 inches? llpr~.#r. to-R.~i~sus IY" (w4 ca..wL ~,,,,4,,.I;G.1 ~o-)+5+,;1. <br />V The staff recommends grading all topsoil and overburden stockpiles to <br />slopes not to exceed 3H:1V in addition to planting stockpiles with <br />J western wheatgrass. <br />The operator states that the deposit will be mined by creating two <br />benches. Exhibit D-1 does not show these benches. Provide detailed <br />information with respect to: <br />a. bench width <br />b, accessibility routes to upper bench <br />c. backfilling and grading bench to final land slope <br />The staff feels that benches are not appropriate in gravel pits due to <br />problems with stability. <br />What is the geologic nature of the side-slope material upon which 14 <br />inches of overburden will be placed? Describe the structural properties <br />upon which the operator assures slope stability. <br />42 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />It is the staff's understanding that 14 inches of overburden will be ~1~h` <br />stripped and stockpiled for use as "native material" during reclamation. <br />