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:. - ~ ~' iii iiiniiiniii iii • Peck, Inc. P.O. Box 278 Ouray, Co. 81427 Colorado Mired Reclamation Attn: Tom Schreiner 1313 Sherman Street. Rm 215 Denver. CC °0203 Dear Tom: RE: Response of Peck Inc to your letter dated May 5, 1992. 1. OFF SITE IMPACTS: The Charley Logan Ditch and the Sewer Lagoon are over 20C feet beyond the permit boundary. M.irinc will not take place any clcser than 20C feet from any man made structure, except the Walz Ditch. A letter agreement between A1lar. Walz and Nick Peck regarding damages to the tdalz Ditch is enclosed. The low flow channel of the Uncompahgre River will remain at its present location (see enclosed M.ap Exhibit E). The main. channel of the River is the current lcw water channel. During high water (spring runoff May and June). the River floods the bar to be mined through the high water channels depicted on Exhibit E. These channels are between. 2 and 3 feet higher than the lcw water channel elevation. If the River were to change course, it would be to one of these channels and most likely the channel which starts at survey point BR-20 (channel furthest east). The channel would. as the high water channel dces presently, proceed northwest to rejoin. the River as shown. on Exhibit E. This channel presently carries approximately 1;5 of the spring runoff flood water and this v:ill not change due to miring. The 2 to 5 feet of gravel removed by mining will effectively lessen the flood potential to the area east and north of the permit area. Ey removing the 2 to 5 feet of gravel and creating a flat, slightly northwest dip to the pit bottom, the flood waters which are normally contained with i.^. a 5 to 10 foot wide flood charnel will be spread over a 300 foot wide bench. and will be directed away from the eastern and northern banks by the northwest and west dips of the pit bottom. During mining, overall total flotiv rates on the River will not be changed. The 3 to 1 slope cn the nertherr. end of the pit area will act a drop structure, slowing the flcvvs before they leave the permit area and flowing onto the Imhoff property. They will stcp any channel scouring. R'one is occurring at present in this location due to low flows from the flood char..^.el. Flows throuch the flood channels in the pit area durinc the past two years high runoff periods carried approximately 1;5 of the total River volume and •r:as confined to the three channels. tctaling approximately 20 feet in width. If this 1