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TR9PPER GIINING INC. <br />July 27, 1987 <br />Mr. John W. Barton <br />District Manager <br />U.S. Dept. of Labor <br />Mine Safety and Health Administration <br />P.O. Box 25367 <br />Denver, CO 80225 <br />Dear Mr. Barton: <br />ii i i ii i ii i ii iiu iii ~ ~ <br />--.~_-- <br />JUL 3 0 ~y~~ <br />MINED LAhID <br />REClAMA710P1 DIVISION <br />~or~~ <br />Subject: Required 12-month status report on Coyote Dam Facility <br />I.D. No. 1211-CO-9-0018 <br />Currently [he water level in Coyote Dam stands a[ an elevaticn of 6,308.4 <br />feet which equals a stage storage of 73 acre-feet. Our annual sediment sur- <br />vey which was conducted in June after the spring runoff, indicates that we <br />now have approximately 46.7 acre-feet of sediment. This represents an <br />increase in sediment volume of 12.2 acre-feet over the pas[ year. We do not <br />plan any sediment removal in 1987 as the impoundment still provides for our <br />needs of sediment and water storage volume. <br />Total storage capacity remains at 120 acre-feet, including sediment. The <br />average water elevation and depth remains near 6,308 feet and 10.5 feet, <br />respectively, throughout most of the year with the water elevation and depth <br />increasing 3 or 4 feet for several weeks in [he spring until the gate valve <br />is opened and [he water is decanted back to or near the decant elevation of <br />6,305 feet. Average sediment elevation is near 6,298.5 Feet with a maximum <br />sediment depth of 13.5 feet along a short stretch of old drainage channel <br />nearest the dam. <br />The structural integrity of the dam has remained unchanged and all appur- <br />tenant structures, including trash racks, decant, valves and discharge C.M.P. <br />are in place and operating as designed. During 1987, we performed the fol- <br />lowing work on the impoundment structure: <br />1) Herbicide applications [o eradicate sagebrush. <br />2) Mechanical mowing [o eradicate sagebrush on dewns[rea_m toe. <br />3) Gravel-surfaced the access road. <br />4) Water elevation gauge repainted and restenciled above 6308 feet. <br />5) Interseeded downstream dam face. <br />6) New dam ID number posted on identification sign. <br />M. <br />.~ <br /> <br />~; / i~: <br />pc W_ Henderson <br />CMI,RD <br />Sincerely, <br />arding, Jr. <br />ualified Impoundment <br />Inspector <br />P.O. Box 187 Craig, Colorado 81626 (303) 824-4401 <br />