Laserfiche WebLink
SECTION 3.0 2021 Drainage Reconstruction, Improvement and <br /> Repairs at Trapper Mine <br /> <br /> <br />3.1 Drainage Reconstruction 1987-2021 <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 2021. At the <br />conclusion of the 2021 field season, approximately 141,870 linear feet (26.9 miles) of permanent <br />drainage reconstruction has been completed at Trapper Mine (Map 1). In 2021 – 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 1987-2021 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. Dozer basins and/or <br />stock ponds were cleaned and repaired in Johnson, West Pyeatt, East Pyeatt, Oak, Middle Flume and <br />East Middle Flume drainages in 2021. Approximately 550 feet of reconstructed drainage in Deal Gulch <br />was repaired in 2021. <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 2/22 <br />[DRMS21RPT\21 Drainage Repair text 3-0] <br />