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2024-03-22_GENERAL DOCUMENTS - C1981010
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2024-03-22_GENERAL DOCUMENTS - C1981010
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Last modified
4/3/2024 8:11:37 AM
Creation date
4/3/2024 8:10:56 AM
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DRMS Permit Index
Permit No
C1981010
IBM Index Class Name
General Documents
Doc Date
3/22/2024
Doc Name
Proposed Decision and Findings of Compliance
From
DRMS
To
Trapper Mining, Inc.
Type & Sequence
SL24
Permit Index Doc Type
Findings
Email Name
RAR
JLE
Media Type
D
Archive
No
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• Land use. <br /> • Land cover. <br /> This methodology allows for applying each block's actual vegetative cover data of the SEDCAD run <br /> for that block. Run for pre- and post-mining conditions, SEDCAD 4 calculated the peak settleable <br /> solids concentration of runoff flowing to a single discharge point at the down-stream end of each 20 <br /> acre study area. The Division finds use of 20 acre study areas a valid approach for modeling <br /> sedimentation in reclaimed drainages in the bond release area. <br /> The total sediment load calculated for the pre-mining block F, L and Z-AB 20 acre study area was 27.4 <br /> tons of sediment and for the same postmining block, 17.3 tons of sediment. TMI's SEDCAD 4 modeling <br /> concluded that the calculated postmining peak settleable solids generated from each block is less than the <br /> calculated premining value. The Division's review of each parameter is presented in the table below. <br /> Permit Number C1981010 <br /> SL24 Page 14 of 16 <br />
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