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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
Metadata
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Template:
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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Table 4 cont. USLE Variables and Basis for Selection <br /> Post-mining <br /> Variable Trapper's Trapper's Source Division's Comment <br /> Selection <br /> R 30 SCS Map: R factors for Colorado Reasonable, as per Trapper's <br /> location on R factor map. <br /> Trapper Permit C 198 10 10 Appendix Q Reasonable, as per soil types on <br /> K 0.25 Section XIII bond release blocks delineated <br /> on map M29. <br /> LS 8.11 SCS LS Table, 719 ft, 16.7% Slope Reasonable based on the 16.7% <br /> slope and 719 ft. slope length. <br /> SCS C factor table for permanent pasture, <br /> rangeland, idle land and grazed woodland— Reasonable as per vegetation <br /> C 0.022 50%canopy,cover and 55%effective cover data submitted with SL24 <br /> grass type (Permit Table 4.42). application(Table 1.2-1). <br /> P 1.0 SCS P factor table for specified conditions Reasonable, as no control <br /> practices were utilized. <br /> SEDCAD Comparison: Trapper utilized baseline data for selecting SEDCAD 4 parameters for <br /> modeling pre-mining conditions. Trapper utilized recent vegetative data in the bond release submittal <br /> for modeling post-mining conditions. The parameters employed in the SEDCAD model, and their <br /> definitions are presented in the table below: <br /> Table 5. SEDCAD Parameters and their Definitions <br /> Parameter Definition <br /> Design Event Climatic erosivity factor due to precipitation <br /> CN (Curve Number) Soil erodibility as a function of land use and hydrologic soil <br /> group. <br /> Land Use Slope length and steepness factor <br /> Hydrologic Condition Cover management/land use <br /> Hydrologic Soil Group Soil structure and infiltration rate <br /> CP Factor (Control Practice <br /> Factor) <br /> Time of Concentration Time for runoff in watershed to reach the watershed outlet. <br /> The parameters reasonably represent the conditions in the field for pre and postmining conditions. <br /> Trapper used SEDCAD 4 to model 20 acre study areas possessing the following sedimentologic <br /> characteristics representative of each bond release parcel: <br /> • Average slope <br /> • Slope lengths. <br /> • Soil erodibility factor. <br /> Permit Number C1981010 <br /> SL24 Page 13 of 16 <br />
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