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2012-06-20_PERMIT FILE - C2010089A (28)
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2012-06-20_PERMIT FILE - C2010089A (28)
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Last modified
8/24/2016 5:01:23 PM
Creation date
8/24/2012 3:03:54 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C2010089A
IBM Index Class Name
PERMIT FILE
Doc Date
6/20/2012
Doc Name
Protection of Hydrologic Balance
Section_Exhibit Name
Section 2.05.6(3)
Media Type
D
Archive
Yes
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ponds. The design of the ponds has been developed to prevent additional contributions of <br />sediment to stream flow outside the permit area, to minimize erosion, and incorporates detention <br />times sufficient to ensure that all applicable effluent standards will be met. The pond discharge <br />structures are designed according to standard engineering design procedures for protecting <br />against erosion via emplacement of riprap and/or energy dissipaters. The pond will be removed <br />and reclaimed following the completion of mining and reclamation unless prior approval to <br />retain this impoundment is obtained. <br />The impact of a sediment pond and runoff from reclaimed areas on the quality of receiving <br />streams was found to be of minimal significance (see Probable Hydrologic Consequences at the <br />end of this section). All terms and agreements specified in the approved NPDES permit will be <br />adhered to during the mining operation to ensure that effluent will meet the permit limitations. <br />Based on past water quality monitoring at New Horizon 2 Mine, it is anticipated that no <br />treatment of pond effluent is necessary. However, should the need for treatment of pond effluent <br />be demonstrated, WFC will commit to designing treatment facilities or procedures to handle the <br />equivalent of a 10 -year, 24 -hour effluent volume. <br />Plans for sampling overburden and topsoil after backfilling and grading have been developed and <br />are presented in Section 2.05.4(2)(d), Topsoil Redistribution. Based on these plans, surface <br />runoff from disturbed reclaimed areas will not come in contact with materials that would <br />contribute to elevated levels of acid or toxic constituents. <br />Topsoil handling procedures (Section 2.05.4(2)(d), Topsoil Redistribution) and revegetation <br />methods (Section 2.05.4(2)(e), Revegetation) have been developed to stabilize the landscape, <br />prevent erosion, and minimize the additional contributions of sediment to runoff They include: <br />the seeding of temporary disturbance and topsoil piles; mulching, chisel plowing and deep <br />ripping; cover cropping; and timely reseeding of reclaimed areas (regraded and topsoiled) with <br />seed mixes designed for rapid establishment and development of effective hydrologic cover. <br />Those areas that are affected by mining will be graded to post mining topographies that generally <br />feature slopes no greater than 5:1. In combination with the reclamation and topsoil handling <br />techniques, reduced slopes will minimize the potential for erosion due to accelerated sheet wash <br />or gullying. <br />Diversions will be designed according to accepted design criteria, and will be built to minimize <br />erosion and prevent additional contributions of sediment by limiting the flow velocities and <br />tractive forces that cause erosion. Temporary diversions in place longer than a growing season <br />will be seeded with a temporary seed mix as outlined in Section 2.05.4(2)(e). Diversions have <br />been designed to maximize geomorphic stability while minimizing disturbance. All temporary <br />diversions will be removed and reclaimed after mining activities have been completed. Plans <br />have been developed for water rights augmentation pumping that will meet effluent limitations <br />and minimize erosion. Drainage from haulage and access roads will be routed to the sediment <br />Section 2.05.6(3) Page 5 November 2011 <br />
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