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`~ YniEM States Depaet~eo! of AgrlculWre 4 MRCS ~ ~~ Natural Resources Canservaoon Service ~ ,Ir-S Brighton Service Center ~ 0 57 W. Bromley Lane Brighton, Colorado 80601-3025 ~ ~^S RECEIVED our z 4 200 303-654-7004 -Office 303-659.1768 - Fau www.co.usda.gov August 18, 2004 State of Colorado Division of Minerals and Geology 1313 Sherman Street, Room 215 Denver, CO 80203 Attn: Gregg Squire, E~ onmental Protection Specialist (/ RECEIVE® OCT 1 32004 Giuision of Minerals and GeoloBY Subject: Proposed Surface Extraction of Construction Materials and Reclamation, Regular (112) Permit Application, Aggregate Indus ' s - WCR, Wallenberg Ickes, File No. M-2004-051 ~- The West Adams Soil Conservation District has requested assistance from our agency in reviewing the subject new proposed Mining and Reclamation Permit application to mine sand and gravel on an approximate 245 acres of the 421 acre site near Brighton, Colorado. Reclamation of the site will be completed to reclaim the affected land to municipal water storage reservoirs, upland and wetland areas. We have the following comments and recommendations on this application. Reclamation Plan Topsoil and Overburden Stockpiles 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, aze 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 the soil. 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 wheatgrass are recommended, both of which will establish readily and quickly. This temporary seeding should be done at a rate of 15 total pounds PLS per acre. The Natural Resources Conservation Service provides leadership in a partnership effort to help people conserve, maintain, and improve our natural resources and environment.