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uen o ~e a w wnrn e a s,l~ ~ ~~ e~ y rr e a j ~I RCS ~-~n-o ~ Natural Resouroes Conservation Service 303659-7004.Office Brighton Service Center 303659.1768 • Fax 57 W. Bromley Lane www.co.usda.gov Brighton, Colorado 80601-3025 Mazch 3, 2004 ~~~~i~/E® State of Colorado MAR 0 g 2004 `~ Division of Minerals and Geology 1313 Sherman Street, Room 215 Division of Minerals anJ Geology Denver, CO 80203 Subject: Amendment to Regular (112) Operation and Reclamation Permit Application Brannan Sand & Gravel Company, Pit 29, Permit No. M-1980-183 / The West Adams Conservation District has requested assistance from our agency in reviewing the subject amended Mining and Reclamation Permit application that adds 30.64 acres of mining area, includes installation of a slurry wall and change of end use to A water storage.reservoir. We have the following comments and recommendations on this application Reclamation Plan ~' , . ~ . ,i• ~ . - , -.~ ~,. _......„, r.;,, .. Water StorageReservoif~ -~~ `~ ';~ "~ ,~,'~ i,~. ~,;.~:,, .. Exhibit E Reclamation Plan states that reservoir side slopes left by the mining operation will be reclaimed similar to the original permit application, that is 3H:1 V or less slopes. It is recommended that the final reservoir slopes be no steeper than 3:1, and preferably less steep, to permit eventual use of the reclaimed reservoir by wildlife. Steep slopes such as 3:1 can' discourage wildlife from approaching and using the water body. T~soil The Natural Resources Conservation Service (NAGS) recommends that, iftopsoit is stockpiled over 30 days, it be seeded immediately to protect it. Stockpiled topsoil should be graded with finished slopes not to exceed 4H:1 V. The topsoil should be seeded as soon as possible 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 requve control based on the state noxious weed list. Through immediate seeding to promote temporary 'cover, the oppoituriity for weed invasion will be less, as will the potential for erosion. ~l' a cf _:i^r'~:": 1-t:"ae Stockpiled topsoil used in reclamation within 5 years should be seeded with temporary cover ,vegetation such as Luna Pubescent Wheatgrass and/or Intermediate Wheatgrass that will establish readily and quickly ~ Topsoil~that will 6e stockpiled for`more than 5 yeazs should be seeded with the reclamation native grass, wildflower and shrub mix shown in Table A: The Natural Resources Conservation Service provides leadership in a partnership effort to help people