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~!' <br />DIVISION OF MINERALS AND GEOLOGY <br />Departm~iAGT~la~t}fSt&13ks,rE~Ftd Best Management Practices <br />STATE OF COLORADO <br />1313 Sherman S[., Room 215 <br />Denver, g~ @@p~l in the Stormwater Management Plan, reclamation of the following outfalls <br />Phone: (~o e.3;g~hed in 2000: <br />FAX: (30 k` <br />~gC'3OxLORADO <br />ILt`Y N E RA L S <br />GEOLOGY <br />RECLA MATION•MI NING <br />SAFETY•SCIENCE <br />Bill Owens <br />Governor <br />Pond Outfall <br />Number Notes <br />001 Old Refuse Pile, East <br /> U er <br /> Middle <br /> Lower <br />006 Old Refuse Pile, To <br />008 Bus Gara e <br /> East <br /> Wes[ <br /> North <br />010 Warehouse <br /> U er <br /> Lower <br />013 Mine 4 <br />Pond Outfall <br />Number Notes <br />017 Mine 5 <br />018 Mine 1 <br /> U er <br /> Lower <br />021 Sute Refuse Pile <br /> U er <br /> Lower <br />022 Mine 2 <br /> U er <br /> Lower <br />023 Mine 3 Bin Pad <br />024 Slu Pond <br />025 Rock Tunnel Pad <br />Russell George <br />Executive Director <br />Ronald W. Cadany <br />Division Director <br />Natural Resource Trustee <br />Reclamation construction at each of the ponds was accomplished in the same manner. <br />Construction began by excavating the corrugated metal pipe (CMP) dewatering device located <br />within each pond. Excavated dirt was generally used as a topsoil substitute at the top of the pond <br />embankment, along a small portion of the pond margin, or on associated access roads. Duting <br />removal of the CMP, the side slopes of each cut were reduced to 2.5 H : 1 V, and the excavation <br />was widened to five feet minimum width. Following completion of excavation, two courses of <br />rip rap were placed within the cut. The first was mechanically pushed into the excavated <br />embankment at the base and into the lower portion of the side cuts. The second course was <br />placed over the first. The cut slopes were then severely roughened to minimize erosion potential <br />and to promote successful revegetation. A wetlands seed mixture was distributed around the <br />perimeter of each pond from the water level to an elevation ten feet above the water level. An <br />upland, high altitude reclamation seed mixture was distributed on any disturbed areas above the <br />ten foot elevation, and on the access roads. Approximately sixty willow cuttings were planted at <br />the perimeter of each pond. <br />The Best Management Practices employed included severe surface roughening of excavated pond <br />embankments in order to disrupt surface flows and to minimize erosion potential. Construction <br />was accomplished when water levels were low so as to not impact water quality with sediment. <br />Office of <br />Mined Land Reclamation <br />Office of <br />Active and Inactive Mines <br /> <br />Colorado <br />Geological Survey <br />