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1 <br />1 •i <br />I 1 <br /> <br /> <br />1 <br />SNOWMASS COAL COMPANY <br />Mine Ollice: <br />P.O. Eo>r 960 <br />CarDOndale, Colorado 81623 <br />(303) 9633440 <br />Denver O//fce: <br />March 14, 1983 <br />Regulator Unit 4 <br />U.S. Army Engineer District, Sacramento <br />Crossroads Energy Building, Suite 111 <br />2784 Crossroads Blvd. <br />Grand Junction, CO 81501 <br />Gentlemen: <br />Sulte 2300 <br />410 Seventeenth Street <br />Denver, Colorado 60202 <br />(303) 8251966 <br />Snowmass Coal Company is in the process of receiving final approval for <br />,' a new five-year permit to mine.coal from the Colorado Mined land Reclamation <br />Division. As a condition for approval, Mined Land Reclamation has indicated <br />that some type of flow recording structure will have to be placed on North <br />' • Thompson Creek above and below our mine permit area. Snowmass Coal Company <br />wishes to conduct an experiment whereby one weir will be constructed before <br />the spring runoff becomes too large. This experiment will allow us to eval- <br />uate the feasibiljty of weir construction near the mine site. This letter <br />will state the details surrounding the weir and its construction: I plan to <br />meet with the Mined Land Reclamation Division on March 23, 1983. I would <br />appreciate it if you could advise me before that date if this project would <br />' be covered under the nation widt? permit or if a general permit is required <br />to construct this weir. <br />' Figure l shows the regional location of the mine site. The weir will be <br />located in Section 34, Township 8S, Range 89W. Data from a weir operated <br />by the U.S.G.S:, in Section '28, Township 8S, Range 89W, indicates that the <br />mean flow fqqr North Thompson Creek was T6.7 ft.3/sec. The maximum discharge <br />' was 365 ft.3/sec., and the minimum discharge was 0 ft.3/sec. A11 of this <br />data was collected between October, .1963, and September, 1979. , <br />' Figures 2, and~3 show the actual design of the weir. The stream chan- <br />nel at the proposed weir si.te.is 23.0 feet wide. Therefore, the width of <br />the weir will be=23.0 feet. ,. <br />The weir will be constructed out of concrete. All exposed concrete sur.-.., <br />faces will then be covered with 1/4 inch Steel plate to protect it from large <br />boulders and logs that move down the stream during high runoff.. <br />1. <br />r~- .. .. <br />a <br />i <br />x <br />a <br />