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Larry Oehler <br />~i <br /> <br />-2- <br />Stabilization of Topsoil Stockpiles <br />April 4, 1990 <br />Plate 4 indicates that approximately 115 acres will be re- isturbed( <br />during the proposed mining operation. The numbers used on e <br />indicate that approximately 14p90 cubic yards of topsoil w 11 be <br />stockpiled for use during rec amation. <br />Since topsoil is a very limited resource at the proposed m 'ne site ./ 1 <br />~ <br />lK <br />stockpiled topsoil should be protected from losses due to ind and wa r <br />ID <br />ter <br />erosion. Therefore, the Division recommends that topsoil ockpiled for be K!~ <br />periods of~3 months or greater be seeded with a suitable c <br />s <br />ecies <br />h <br />Divisi <br />n <br />ls <br />r <br />"li <br />h <br />dli <br />" <br />d ver crop <br />i <br />t ,~~(,~rwy <br />p <br />. <br />e <br />o <br />a <br />o <br />ecommen <br />s <br />ve an <br />ng <br />or rec <br />z ~~ 4 <br />Y <br />placement of topsoil onto regraded areas whe n feasible ~ <br />Please commit to seeding topsoil stockpiled for periods of months or <br />greater with a suitable cover crop species, such as <br />(Larry can you su~~est a species here). yet <br />3. Prevention of Discharge/Flood Protection <br />The applicant has proposed a minimum setback distance of 50 feet from the <br />South Platte River. Also, the applicant has opted not to o tain an NPDES <br />water discharge permit. The Division has several concerns egarding <br />these issues with respect to compliance with applicable Sta a and Federal <br />Regulations. <br />The Clean Water Act (PL 92-500) was amended as of May 24, 1 <br />effluent limits and best management practices (BMP's) for g <br />mines. One of the Clean Water acts provisions pertains to <br />diversion, and requires that the flow of surface waters int <br />site be interrupted and these waters diverted around and aw <br />incursion into the plant site. The applicant has partially <br />this concern by stating that the Columbia Ditch will interc <br />run-on upgradient for the entire mine site. The Division w <br />Reclamation Resources to address what measures will be impl <br />accordance with the Clean Water Act, to prevent runoff fnem <br />from entering the <br />Another Clean Water Act provision pertains to berm construc <br />requires that berms, including any pond walls, ditches, low <br />similar water retention structures shall be constructed in , <br />that they are reasonably expected to reject the passage of ~ <br />Reclamation Resources has opted not to obtain a NPDES water <br />permit, they must assume responsibility for any discharge o <br />water from the operation at any time during the life of.min~ <br />Because of the serious nature of any discharge of process w, <br />Middle Fork of the South Platte River, the Division require <br />Reclamation Resources choose one of two options to ensure c <br />applicable State and Federal Laws and to ensure that potent <br />the hydrologic balance at the Alma Placer will be minimized <br /> <br />88 to include <br />1 d placer <br />urface water <br />the plant <br />y from <br />addressed <br />pt surface <br />uld like <br />mented, in <br />plant site. <br />ion. The Act <br />dams and <br />manner such <br />ater. Since <br />discharge <br />process <br />5aeFra- <br />ters to the <br />that <br />mpliance with <br />al impacts to <br />