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2015-09-17_PERMIT FILE - C1984065A (2)
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2015-09-17_PERMIT FILE - C1984065A (2)
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Last modified
8/3/2018 8:55:28 AM
Creation date
10/1/2015 9:39:25 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1984065A
IBM Index Class Name
Permit File
Doc Date
9/17/2015
Doc Name
pp.4-53 to 4-73
Section_Exhibit Name
4.4 Reclamation & 4.5 Post Mining Land Use
Media Type
D
Archive
Yes
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streamflow or runoff outside the permit area as untreated drainage from the natural <br />surrounding area. <br />A similar soil loss comparison was performed to determine if untreated drainage from the <br />irrigated hayland community is contributing suspended solids to streamflow or runoff outside <br />the permit area in excess of premining levels. The study presented on page 4-58vi <br />demonstrates that untreated drainage from the reclaimed irrigated hayland area will <br />contribute the same amount or fewer suspended solids to streamflow or runoff outside the <br />permit area as untreated drainage from the adjacent irrigated hayland field. <br />Restoration of the essential hydrologic function of the Alluvial Valley Floor has been <br />accomplished by restoring flood irrigation to the irrigated hayland portion of the reclaimed <br />area. Productivity of the hayland has been restored and is documented in the vegetation <br />study. <br />For the majority of the site, sedimentation control including small area exemption controls <br />are no longed required based on the fact vegetation at the mine site has been scientifically <br />sampled and it has been determined the reclaimed areas will not contribute suspended <br />solids to streamflow or runoff outside the permit area in excess of premining levels. <br />A six and one half acre section of the site associated with the reclamation of Sediment Pond <br />A is scheduled for reclamation in 2015. Per the terms of discharge permit C00048972, a <br />sediment control plan for the reclamation has been designed and will be installed before <br />reclamation is initiated. The purpose of this plan is to ensure sediment loss associated with <br />the reclamation will be the same or less than sediment loss at pre -mining levels. Details of <br />the plan begin on page 4-58vii. <br />Sediment logs will be used to minimize the impacts of sediment loss during stormwater <br />runoff. The demonstration beginning on page 4-58iii shows that sediment loss from the pre - <br />mining portal and bench area is 1.01 tons per acre per year, and for the irrigated hayland will <br />be 0.06 tons per acre per year. The demonstration beginning on page 4-58vii for the <br />reclaimed borrow area and cropland area shows that after being seeded, mulched and with <br />a sediment log in place, the sediment loss will be zero tons per acre per year. Future land <br />uses, including pasture/wildlife and cropland are delineated on Figure 4.7-2. <br />Please see page 4-58ix for location of sediment logs. Sediment logs will be installed at the <br />toe of all cut slopes, and at the low point of all fill slopes to minimize sediment transport. <br />Sediment logs are installed using a combination of trenching and staking. First, they are <br />placed in a small trench that is any where from 2" to 5" in size. Once the logs are placed in <br />the trench, the area can then be backfilled with soil until they are tightly packed. Sediment <br />logs should be installed side by side until the one end is tightly packed against the end of the <br />adjacent log. After the sediment logs are in place, they can then be staked along every end <br />and every 4 ft. on center. <br />Coal Ridge No. 1 4-58i 07/15 <br />
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