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2018-03-23_PERMIT FILE - C1981008A (2)
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2018-03-23_PERMIT FILE - C1981008A (2)
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Last modified
7/10/2020 7:59:39 AM
Creation date
4/24/2018 10:29:10 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981008A
IBM Index Class Name
Permit File
Doc Date
3/23/2018
Doc Name
Protection of the Hydrologic Balance
Section_Exhibit Name
Section 2.05.6(3) Protection of the Hydrologic Balance
Media Type
D
Archive
Yes
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Table 2.05.6.(3)-1 <br /> Summary of Consequences of the Life-of-Mine Mining Plan for the New Horizon Mining Area <br /> Probable Hydrologic Consequences Analysis Results Significance <br /> Surface <br /> Water <br /> 1 Effects of mining on the local A stream channel course has been altered, the length has been Adequate reclamation and channel design has resulted in a stable <br /> geomorphology reduced, and the overall gradient will be slightly increased after channel.Monitoring conducted in the channel since 1980 indicates <br /> the removal of the 001 pond. Watershed areas will increase, no additional contributions of suspended sediment. Watershed <br /> elevations and slopes will be reduced,and slope lengths and time of impacts will be mitigated by contour ripping, mulching and <br /> concentration will increase. prompt revegetation. The watershed impacts are expected to be <br /> very minimal. Once full reclamation is done on the property by <br /> 2014,the site will have no impact on the local geomorphology. <br /> 2 Effects of sediment ponds on channel Channel reaches below the frequently discharging ponds, will Long term channel impacts until bond release followed by short <br /> characteristics and downstream users. become incised with active meandering channels and vegetation term channel readjustment period when ponds are removed. <br /> will encroach along the channel edges. AVF study indicates that Impacts are of minimal significance and increased vegetation <br /> the channels in Tuttle and Calamity Draws are too incised for flood should help control sediment during channel readjustment <br /> irrigation hence neither Draw is determined to be an AVF. period. No mitigation is necessary for AVF's (negative <br /> Surface water impounded by the sediment ponds may affect water determination). New Horizon has water rights to more water than <br /> rights downstream. required for mining related uses. An augmentation plan has <br /> been developed for mitigating any impacts proven on <br /> downstream users. <br /> 3 Effects of sediment pond Sediment ponds designed for 10-year, 24-hour events. Historic Sediment pond discharge impacts will be negligible because <br /> discharges, diversions and culverts at NPDES monitoring have only resulted in one exceedences of TSS. discharges will meet NPDES permit limits. Diversions and <br /> road crossings on surface water No exceedences of any other required parameter has been culvert impacts will be negligible because they have been <br /> quality. observed. Diversions and culverts are designed to adequately designed to minimize erosion and to protect the hydrologic <br /> convey runoff through and around disturbed areas without balance. <br /> contributing additional suspended sediment. <br /> 4 Effects of runoff from reclaimed areas Reduced runoff rates and volumes, and lower sediment Impacts due to reduced runoff will be negligible due to the <br /> on the quality of streamflow. concentrations and yields. Possible large reductions in runoff due to relatively small reclaimed basin sizes. Flow in the vicinity of <br /> lower slopes and longer hydraulic lengths. Lower slopes and both mining areas is dominated by irrigation return water, not <br /> reclamation practices will result in reduced sediment loads. runoff. <br /> 5 Effects of runoff from reclaimed areas Reclaimed area runoff water will be suitable for livestock No short or long term significant impacts. <br /> on the quality of streamflow. drinking water. Runoff from reclaimed areas as measured at <br /> NPDES 001 has not degraded the quality of water of receiving <br /> streams. <br /> January 2017 (TR-77) 2.05.6(3)-13 <br />
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