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/ YafEed States Depsrbneu! d Agrlcukurs v o MRCS Naural Resources Conserva8on Service Brighton Service Center 57 W. Bromley Lane Brighton, Colorado 806013025 La' ~ ut eti/~s 303659-7004 -Office 303659-1768 -Fax www.co.usda.gov January 23, 2006 RECEdVE® State of Colorado Division of Minerals and Geology 1313 Sherman Street, Room 215 Denver, CO 80203 ~'JAId 15 1006 v Division of Minerals and Geology Attn: Erica S. Crosby, Environmentat Protection Specialist Subject: Hall-Irwin, Pazker-Dersham Resource, File No. M-2006-003 The West Adams Soil Conservation District has requested assistance from our agency in reviewing the subject proposed Mining and Reclamation Permit application to mine sand and gravel near Brighton, Colorado. Reclamation of the site will be completed to reclaim the affected lands to municipal water storage reservoir and upland pasture. We have the following comments and recommendations on this application. Reclamation Plan Water Storage Reservoir It is recommended that the final reservoir slopes be no steeper than 3:1, and preferably less steep such as 4:1 or 5: 1, to permit eventual use of the reclaimed water storage reservoirs by wildlife. Steep slopes such as 3:1 can discourage wildlife from approaching and using the water reservoir. Toil The NRCS recommends that topsoil stockpiled for reclamation be segregated from other spoil. The topsoil and overburden stockpiles should be graded with final slopes no steeper than 4H:1 V. Slopes that are less steep allow easier maintenance, are less susceptible to water erosion and more readily establish grass protective cover. It is highly recommended that topsoil and overburden stockpiled over 30 days be seeded immediately as weather permits to protect it. The immediate seeding of these stockpiles should be done to avoid soil erosion from wind and water, as well as from a weed standpoint. Weeds are very invasive and move onto disturbed areas very quickly. Some ofthese can be noxious weeds and require control based on the state noxious weed list. Through immediate seeding to promote temporary cover, the opportunity for weed invasion will be less, as will the potential for erosion. For seeding the stockpiles, Luna pubescent wheatgrass and/or Amur intermediate The Natural Resources Conservation Service provides leadership in a partnership effort to help people conserve, maintain, and improve our natural resources and environment.