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Un16ed Slates Deparlnent of ggrlwNune o ARCS Natural Resources Conservatlon Service Brighton Service Cen[er 57 W. Bromley Lane Brighton, Colorado 606013025 February 2, 2004 State of Colorado Division of Minerals and Geology 1313 Sherman Street, Room 215 Denver, CO 80203 Attn: Erica S. Crosby, Environmental Protection Specialist 303659-7004 -Office 303-659-1768 -Fax www.co.usda.gov :,,,,.~ P:;i U ~' L~uJ Subject: Lupton Lakes Resource, S W TKO Joint Venture, File No. M-2004-078 The Platte Valley Conservation District has requested assistance from our agency in reviewing an application to conduct surface extraction of construction materials (sand and gravel) and site reclamation near Ft. Lupton, Colorado. Reclamation of the site wr71 be completed to reclaim the affected land to municipal water storage reservoirs. We have the following comments and recosrnnendations on this mining and reclamation application. Reclamation Plan Water Storaee 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 disco_ura~*e wil_d_life_ from approaching and using_the_waterseser_voir. To soil 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 3H: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 aze very invasive and move onto disturbed azeas very quickly. Some of these 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