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SECTION 3.0 2024 Drainage Reconstruction, Improvement and <br /> Repairs at Trapper Mine <br /> <br /> <br />3.1 Drainage Reconstruction 1987-2024 <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 2024. At the <br />conclusion of the 2024 field season, approximately 147,630 linear feet (27.96 miles) of permanent <br />drainage reconstruction has been completed at Trapper Mine (Map 1). In 2024 no new drainage <br />reconstruction occurred on the site. <br /> <br /> <br />3.2 Drainage Improvements and Repairs <br /> <br />Improvements and repairs were performed to provide benefits to all drainages treated in 1987-2024 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, East Pyeatt, Middle Flume, East Middle Flume and <br />Deal drainages in 2024. Sediment ponds Johnson #10 was partially cleaned at the inlet, No Name #2 <br />and Middle Flume #3 received perimeter cleaning of the inlet delta. New Sediment pond East Buzzard <br />#3 received additional fill on the dam to remedy a low freeboard issue during the summer of 2024. <br />Repairs of approximately 15,000 feet of drainage were conducted in the L/K Pit and the D Pit <br />reclamation areas due to deep rills. <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. No new drainage reconstruction occurred in 2024. <br /> <br /> <br /> <br /> <br /> <br /> <br />GCR 3/25 <br />[DRMS24RPT\24 Drainage Repair text 3-0] <br />