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SECTION 3.0 2020 Drainage Reconstruction, Improvement and <br /> Repairs at Trapper Mine <br /> <br /> <br />3.1 Drainage Reconstruction 1987-2020 <br /> <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 2020. At the <br />conclusion of the 2020 field season, approximately 141,870 linear feet (26.9 miles) of permanent <br />drainage reconstruction has been completed at Trapper Mine (Map 1). In 2020 – No new drainage <br />reconstruction occurred. <br /> <br /> <br /> <br />3.2 Drainage Improvements and Repairs <br /> <br />Improvements and repairs were performed to provide benefits to all drainages treated in 1987-2020 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 11,200 linear feet of drainage ways in Flume drainages <br />during the 2020 field season. <br /> <br /> <br /> <br />3.3 Drainage Reconstruction Design Summary <br /> <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 /> <br /> <br /> <br /> <br /> <br /> <br />GCR/BDN 3/21 <br />[DRMS20RPT\20 Drainage Repair text 3-0] <br />