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~• .n i <br />Snowmass <br />CCY.~MNY <br />SNOWMASS COAL COMPANY <br />Mine O//.ce: <br />Denver O/l.ce: <br />March 14, 1983 <br /> <br />~ .~ <br />~I <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 />P.O. Box 980 <br />Carbondale, Colorado Bt623 <br />(303) 963.3aa0 <br />Suite 2300 <br />at0 Seventeenth Street <br />Denver, Colorado 80202 <br />(303) 825.1966 <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 antl 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 feasibility 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 nationwide permit or if a general permit is required <br />to construct this weir, <br />Figure 1 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 SS, Range 89W, indicates that the <br />mean flow fpr North Thompson Creek was 16.7 ft.3/sec. The maximum discharge <br />was 365 ft.3Jsec., 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 site .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 />bou]ders and logs that move down the stream during high runoff.. <br />