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<br />CERTIFIED ,: P5G31117. r <br />~1r. John M. Dc~9ichici <br />District Manager <br />ICS. Dept of Labor <br />Kline Safety & Health Administration <br />P.O. Box 25367 <br />Denver, CO 80225 <br />Dear Mr. DeMichiei: <br />J L5 ~ r5 J ''J :_c ~: <br />_ ' ~l.,G v U <br />I ~~ <br />Suhject: Annual impoundment Report: Coyote Dam (I.D. 10. 1217-CO-09-028:+~-t)t) Trapper <br />Mine(OS-02538) <br />The structural integrity of Coyote Dam has remained unchanged. All appurtenant structures inc(udine trash <br />racks, decant, values and discharge CMP are in place and operating as designed. Avery small trickle of <br />water has dc~cloped in the decant cuiven that be pan after our last principal spilhvaa relea,e in ~lat~'.t. I <br />believe that the trickle is caused by a small obstruction in the decant cover which we are currently <br />investigating. In my estimation, this decant leak represents anon-hazardous condition and does not affect <br />the stability oC the structure. <br />There have been no modifications to the structure in the past year and we do not anticipate any significant <br />maintenance of the structure during the current year. <br />Water level elevations for the past year have Ouctuated from a low of 6305.3 h on 8/1/39 to a high of 6370.0 <br />ft on 9/5189. Average pond water elevation was 6=03.0 ft. Currently, the water Jevel is at 6306.1 ft as of <br />7r1r9o. <br />The geometry of Coyote Dam has not changed and there has been no measurable sediment contribution <br />since our last report according to visual inspection and the annual sediment survey done on 7/25190 at <br />Coyote. Therefore the current runoff capacity to the crest of the emergency spill remains unchanged at <br />90.17 acre-feet as well as the total sediment volume in the pond of 15.73 acre-feet. <br />If you have any questions regarding this report, please call. <br /> ~rtN'::;uyr;:;yt, <br />" e <br />Sine <br />T <br />e <br />v <br /> <br />app 0 Rfc'. _ ,., . <br />`c~,~ <br />~ <br />, <br />j <br />~~ <br />r <br />J <br /> ~~WtttiartsFl ~ or <br />r ~o i <br />l <br />V <br />/ <br />~~ <br />~(/ <br />~ <br /> ~ <br />~ Roger W. Fish, P.E. <br /> ;. <br />;= <br />Sr. Project Engineer <br /> 6 <br />2Ei <br /> ~ <br />RwFrb =-~: rah <br />``' <br />9 <br />' <br />~MSHAUULY27] . :,Z4 <br />~ <br />0 <br /> E~ <br />t' ~•~ <br />'~4 r~ <br />Eflelestrre <br />t <br />4 j t t~ a a u n t t <br />c J.M. Mattern <br />W. Agnew ~ <br />( <br />W.S. Harding ~i <br />1 <br />P.0. Box 187 Craig. Colorado 81626 (303) 824-1401 <br />