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III IIIIIIIIIIIII III <br />Doc Date:12/11/2001 <br />~<<' <br />SECTION 3.0 Drainages Reconstruction, Improvement and <br />Repairs at Trapper Mine in 1994. <br />3.1 Drainage reconstruction 1987-94 <br />At Trapper Mine, all or portions of five major drainageways (Coyote, Johnson, Buzzard, No-Name and <br />E. Pyeatt) and their tributaries have been regraded and appropriately treated to reduce the erosion rate <br />and assist in permanent channel stabilization from 1987, through 1994. At the conclusion of the 1994 <br />field season, approximately 52,350 linear feet (9.91 miles) of permanent drainages reconstruction had <br />been completed at Trapper Mine (see attached "Drainage Reconstruction" map). Drainage reconstruo- <br />lion totaling 1,900 linear feet was successfully completed in East Pyeatt drainage in 1994. For a <br />complete discussion of Trapper's erosion control procedures and past monitoring results, refer to <br />Section 3.0 of TR-63, 1992 Annual Report. <br />3.2 Drainage Improvements and Repairs <br />Drainages improvements and repairs were performed to provide benefits to all drainages treated in <br />1987-94, as well as portions of undisturbed drainage segments. Drainage improvements included <br />tlozer basin construction in newly stripped topsoil areas and on regraded spoils. Drainage repairs and <br />enhancement were conducted in all previous reconstructed drainageways (87-93). Essentially no <br />downcutting in drainage bottoms occurted. <br />Rock structures were installed at an average frequency of every 100 feet throughout the reconstructed <br />• East Pyeatt drainage in 1994. <br />3.3 Coyote Gulch Monthly Peak Flows <br />There was no recordable discharge in Coyote Drainage during 1994 (Table 1). Excellent establishment <br />of vegetation on reclamation upstream of the flume as well as effective erosion control structures have <br />combined to create a hydrologically stable watershed. As presented on page 4-183b of our mining and <br />reclamation permit, this discharge will no longer be monitored and included within this report. <br />EGDfjsb 1N5 <br />rDMGt94FEP13J <br /> <br />