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~~ MRCS / <br />Natural Resouroes Conservation Service <br />Brighton Service Center <br />57 W. Bromley Lane <br />Brighton, Colorado 80807.3025 <br />A~vV-~~ <br />(kYV1- 0 2 <br />303.659.7004 -Office <br />303659-7 768 -Fax <br />vrww.co.usda.gov <br />March 24, 2004 <br />State of Colorado <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RECEIVED <br />MAR 3 0 2004 / <br />Division of Mire: xi> & Geology <br />Subject: Reclamation Permit Amendment Application <br />Denver Water Department, Reclamation Pit #l, Permit No. M-1977-153 <br />The West Adams Conservation District has requested assistance from our agency in reviewing <br />the subject Reclamation Permit Amendment application that changes end use to a municipal <br />surface water storage reservoir. Our comments and recommendations center on two areas: <br />reclamation of riparian areas disturbed by past mining-related activities and the long-term area <br />impacts on surface Arid subsurface water resources: We have the following comments and <br />.. ,. <br />recommendations,on,this application: I ' ~ • =:''lip ~' .~1, , , .,, -; r:~ ; <br />~s- ~ - ..,. , , <br />~,;r, .i ~~ .:~~ ,. <br />Reclamation P-an ~`•',~ ~•~ ., :. , <br />i~ , .. .~ ;r~ - .. ... .. <br />Water Storage Reservoir' ' ' ' , <br />The Natural Resources Conservation Service (MRCS) recommends that the final reservoir slopes <br />be no steeper than 3:1, and preferably less steep, to permit eventual use of the reclaimed <br />reservoir by wildlife. Steep side slopes can discourage wildlife from approaching and using the <br />water reservoir. <br />Reclamation Re-Vegetation <br />Riparian and other areas surrounding the mine site that have been disturbed by past mining- <br />related activities will require reclamation to prevent wind and water soil erosion. During site <br />reclamation of these areas, it is recommended that topsoil be spread over all areas to be re- <br />~uegetated in lifts not to exceed 4 inches and worked into the slopes to ensure good adhesion and <br />to minimize soil creep. In order to re-establish normal levels of microbial activity in the soil, <br />compost_at the rate of one cubic yard per 1000 ft2 should be mixed with the soil. If compost is <br />not applied, following topsoil replacement and before grass is seeded, the soil should be tested to <br />determine the need for,additional fertilizer. Normal recommended seeding dates aze from <br />November,151 through Apri1~30s' seeding should be done in unfrozen soil. A good quality seed <br />drill with an agitator and press wheels is recommended: - - ... ,., _ , <br />~, ,. .. <br />Dnked States DeparlmeM of Agricukure <br />The Natural Resources Conservation Service provides leadership in a partnership effort to help people <br />