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Colorado Mined Land Reclamation Board 3 October 3Z, Z980 No. 6 Issue - Description of screening mounds. Buffer strips will be Zeft or reconstructed along the west and east perimeters of the Stage I area and along the west, east, and south perimeters of the Stage II area. Proposed locations of buffer strips for Stages III and IV are indicated on Exhibit C. A protective buffer strip will be reconstructed along the south edge of St. Vrain Creek as shown on Exhibit C and detailed in Attachment C. These berms will serve to separate property owners from the proposed permit area. A 50-foot wide berm will be reconstructed along the east boundary to separate the adjacent property oumer's 7 acre pond from any impacts from mining operations. AZZ buffer strips along shorelines and river banks will have a minimum 2:Z slope as per Colorado Mined Land Reclamation Board Rules and Regulations. AZZ buffer strips shall be constructed or °' ~ t-, reconstructed to an elevation equal to the historic elevation of the :'~ ~ °l river bank or natural grade in the area. In the case of the river bank 4`d ~ and the buffer east of Stage I the elevation will be maintained at 482Z,~1,c ~' -;-r' according to information supplied by the Colorado [/ater Conservation // h ~ ~^~~/ Board. ~~ M ry f. No. 7 Issue - Shape and construction of proposed ponds. ~.~- Although it would be easier to construct the barriers between the oonds by leaving predetermined buffers between them, this would of necessity cause us to Zose approximately 25~ of the gravel deposits. The only economic solution is to rebuild the divider strips between the ponds with. screenings and waste material after the mining is complete. Since these divider strips will be covered with topsoil a~xd vegetation there is no '; ~` reason to believe they will be any Zess stable than buffers constructed ~' ~ :Yj' of undisturbed material. Conversations with the Water Conservation Board ~ indicate that during flooding, the flow velocities are on the order ~ _~~' of two feet per second or Zess. This is more likely to cause the deposit of silt than to cause erosion. A buffer of at ZeaSt~SD feet in width will be Zeft between the bank full stage of the ponds and all property adjacent to the area to be permitted. A Z00 foot wide buffer strip will remain , between the operation and the St. Vrain Creek. Cc No. 8 Issue - Z00- year flood impacts on adjacent property f The Colorado Water Conservation Board letter dated October 22, 2980 r indicates that there would not be any significant increase in the existing ,~ flood hazard to the area (Attachment D) Since the adjacent property owner, Mr. SZovek, is located within the Z00- year fZeodplain and, in fact, within or just near to the Z00-year flood- ~ way, the potential for flooding has always been extremely high. By re- constructing the berms as described elsewhere in this letter, the County will operate in such a way as to minimize any adverse hydroZooic impact to acZjaeent property. No. 9 Issue - Effect of operations on wildlife. The County will agree to keep all operations at least 200 feet from St. Vrain Creek during the periods October through December and February ~ through March.