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MID-CONTINENT RESOURCES, INC. <br /> PRODUCERS OF THE FAMOUS COAL BASIN COKING COAL <br /> BOX 158 <br /> 1 CARBONDALE, COLORADO 81623 TELEPHONE <br /> • CWCAGO OFFICE 13031963.2581 <br /> 10S ADAMS STREET TWX <br /> CHICAGO 60603 910 929 8891 <br /> 910 929 6897 <br /> August 17, 1983 <br /> Mr. Jim Herron <br /> Mined Land Reclamation Division <br /> 423 Centennial Bldg.,, <br /> 1313 Sherman St . <br /> Denver, Colorado 81203 <br /> Re: Coal Basin C-017-81 <br /> Old Stipulation No. 7B Due August 31, 1983 <br /> Dear Jim: <br /> Enclosed is a' survey of the Dutch Creek flume ind the <br /> unmodified channel above the flume.* As you can see by the <br /> calculations, both far exceed the 1000 cfs generated by the <br /> 100-year - storm event which occurred July 24, 1977. <br /> • If you look at the cross-section and computations <br /> _ for the flume you will also note that I include only the con- <br /> crete part of the flume. the trapezoidal sides above the <br /> concrete would easily handle twice the water in the concrete <br /> portion. <br /> Please advise me if you have any comments or questions. <br /> Sincerely, <br /> Environmental Coordinator <br /> DWBowman:ms <br /> Enclosures <br /> * See Engineer Survey at Exhibit II-B-7-Att . 6-23 <br /> — 9 <br />