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~t<~ iii riiiiii~iiiiii~i <br />~~" SECTION 3.0 Drainage Reconstruction, Improvement and Doc Date;12/11/yp01 <br />Repairs at Trapper Mine in 1995. <br />3.1 Drainage Reconstruction 1987-95 <br />At Trapper Mine, all or portions of five major drainageways (Coyote, Johnson, Buzzard, No-Name and E. <br />Pyeatt) and their tributaries have been regraded and appropriately treated to reduce the erosion rate and <br />assist in permanent channel stabilization from 1987 through 1995. At the conclusion of the 1995 field <br />season, approximately 54,350 linear feet (10.29 miles) of permanent drainage reconstruction had been <br />completed at Trapper Mine (see attached "Drainage Reconstruction" map). Drainage reconstruction <br />totaling 2,000 linear feet was successfully completed in East Pyeatt drainage in 1995. Rock structures <br />were installed at an average frequency of every 100 feet throughout the reconstrucled East Pyeatt <br />drainage in 1995. Brush hauled from the topsoil pre-strip area was used in fortifying the drainage area <br />between the rock structures. A test plot of landstrand was used in a portion of the Easl Pyeatt drainage <br />for a comparison between these two methods of drainage stabilization. <br />3.2 Drainage Improvements and Repairs <br />Drainage improvements and repairs were performed to provide benefits to all drainages treated in 1987- <br />1995, as well as portions of undisturbed drainage segments. Drainage improvement included dozer <br />basin construction in newly stripped topsoil areas and on regraded spoil. Drainage repairs and <br />enhancement were conducted in all previous reconstructed drainageways (1987-1994). Due to an <br />intense spring runoff wmbined with severe thunderstorms, approximaiely 7,600 feel of drainage repairs <br />~~ occurted in East Pyeatt, Middle Pyeatt and West No-Name drainages. <br />RDN ]/BB <br />rDMG185REP13~ <br />(~ <br />