Laserfiche WebLink
SECTION 3.0 2015 Drainage Reconstruction, Improvement and <br />Repairs at Trapper Mine <br />3.1 Drainage Reconstruction 1987-2015 <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 2015. At the <br />conclusion of the 2015 field season, approximately 122,409 linear feet (23.2 miles) of permanent <br />drainage reconstruction has been completed at Trapper Mine (Map 1). In 2015 — no new drainage <br />reconstruction was conducted. <br />3.2 Drainage Improvements and Repairs <br />Improvements and repairs were performed to provide benefits to all drainages treated in 1987-2015 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 3,222 linear feet of drainage ways in East Pyeatt <br />drainages during the 2015 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 3/16 <br />[DRMS15RP1115 Drainage Repair text3-0] <br />