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• • III IIIIIIIIIIIII III <br />TRAPPER ~ININ6 INC. p ~,., r „ ;9~_ ,.., <br />SEP 2 71996 <br />DIVi~,_,. <br />September 24, 1996 MINERALS 8 i~~~~,i ,~ <br />Mr. Joe Dudash <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 2l5 <br />Denver, Colorado 80203 <br />Dear Joe: <br />Please find enclosed as-built information related to the construction of Oak dams No. l and No. 2. The <br />as-built information sent with the certification of these stmctun:s is substantially the same as is <br />submitted here. The only changes are the west side slope of the Oak No.l principal spillway and the <br />elimination of spillway elevation rounding. Trapper's as-built survey of June 20th, 1996 was consistent <br />with your measurements in the field. The aforementioned spillway side slope was miscoded in the first <br />SEDCAD run. <br />A table comparing design versus as-built measurements and performance predictions is enclosed as well <br />as SEDCAD nms for both the 10 year, 24 hour event and the 25 year, 24 hour event. The use of fill <br />material from the impoundment area increased the capacity of the dams. All values regarding peak <br />settleable wncentrations and freeboard meet the requirements of DMG. <br />Call me if you need additional infornation. <br />Sincerely, <br />~'i~=-~ <br />James M. MaItem, PE <br />Engineering Manager <br />pc F.V. Luke <br />{oakasbll} <br />P.0. Box 187 Craig, Colorado 81626 (303) 824-4401 <br />