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2020-05-05_PERMIT FILE - C1981010 (5)
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2020-05-05_PERMIT FILE - C1981010 (5)
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Last modified
8/22/2022 8:33:13 PM
Creation date
8/22/2022 1:51:29 PM
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Template:
DRMS Permit Index
Permit No
C1981010
IBM Index Class Name
Permit File
Doc Date
5/5/2020
Doc Name
Appendix W 2019 Report Section 1.0
Type & Sequence
TR125
Section_Exhibit Name
Appendix W 2019 Report Section 1.0
Media Type
D
Archive
No
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SECTION 3.0 2019 Drainage Reconstruction, Improvement and <br /> Repairs at Trapper Mine <br /> 3.1 Drainage Reconstruction 1987-2019 <br /> At Trapper Mine, all or portions of nine major drainageways (Coyote, Johnson, Buzzard, No-Name, Oak, <br /> Grouse, Horse, Flume and Pyeatt) and their tributaries have been regraded and appropriately treated to <br /> reduce the erosion rate and assist in permanent channel stabilization from 1987 through 2019. At the <br /> conclusion of the 2019 field season, approximately 141,870 linear feet(26.9 miles) of permanent <br /> drainage reconstruction has been completed at Trapper Mine (Map 1). In 2019—A total of 4,237 linear <br /> feet of new drainage reconstruction was conducted in L-Pit in the Flume Gulch drainage. <br /> 3.2 Drainage Improvements and Repairs <br /> Improvements and repairs were performed to provide benefits to all drainages treated in 1987-2019 as <br /> well as portions of undisturbed and disturbed drainage segments. Drainage improvements include dozer <br /> basins constructed in newly stripped topsoil areas and on newly regraded spoils. Drainage repair and/or <br /> enhancement were completed on approximately 3,530 linear feet of drainage ways in Flume drainages <br /> during the 2019 field season. <br /> 3.3 Drainage Reconstruction Design Summary <br /> Design criteria established with PR-07 shall be summarized for each year for the drainages <br /> reconstructed on the site. Table 3.1 shows the model inputs for each drainage designed and <br /> reconstructed for the reporting year. Map 1 indicates each drainage section reconstructed during the <br /> reporting year. <br /> GCR/BDN 3/20 <br /> [DRMS19RP1119 Drainage Repair text 3-01 <br />
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