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SECTION 3.0 2017 Drainage Reconstruction, Improvement and <br />Repairs at Trapper Mine <br />3.1 Drainage Reconstruction 1987-2017 <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 2017. At the <br />conclusion of the 2017 field season, approximately 134,102 linear feet (25.4 miles) of permanent <br />drainage reconstruction has been completed at Trapper Mine (Map 1). In 2017 — A total of 1,418 linear <br />feet of new drainage reconstruction was conducted in K/Z-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 1987-2017 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 3,900 linear feet of drainage ways in Flume and Oak <br />drainages during the 2017 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 3/18 <br />[DRMS17RP1117 Drainage Repair text 3-0] <br />