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iii iiiiiiiiuiiiiii <br />December 3, 1993 <br />RF,~~c,~~~~ <br />nfC °G 1993 <br />Mr. Joseph Dudash C~;,. <br />Colorado Division of Minerals and Geolo~•:c,. <br />1313 Sherman Rm. 215 ~• "`~~ <br />Denver, CO 80203 "'~"Y <br />Subject: Technical Revision 31 and NOV C-93-126, Silo Loadout <br />Drainage New E1k,Mine, Basin Resources, C-81-014 <br />Dear Mr. Dudash, <br />The enclosed submittal of SEDCAD+ documentation provides sizing for <br />Culverts C-46 and C-47 to drain the"`area-east of the New Elk silos. <br />Culvert C-46 will be installed near the lamp to the east of the <br />silos to roadside ditch D24A. Water wiT~l then follow the road <br />ditch to Culvert C-47 and then.disdharge into D24. The attached <br />SEDCAD+ run documents the entire D24;and..D24A ditch system as well <br />as the sizing of all four culverts:-oti~sthe system. Ditch 23 also <br />contributes 47.2 cfs of flow to culve`'rt•C20 (Table 20), and that <br />flow was added as baseflow. at node 31+~k. • <br />The original permit documentation assumed that the curve number for <br />this ditch was 89. This run uses 85^~to~reflect dirt road surfaces <br />on B soils (Table Mountain Loam). <br />In addition Culvert C-48 has been designed to .pass water from the <br />flume on Ditch D26 to a point east of~the tipple. <br />Three copies of watershed runs, ditch designs and culvert <br />nomography are enclosed for your review.. Please call if you have <br />any questions. `":" <br />Sincerely, <br />Catherine W. Begej <br />Project'Manager <br />cc Mr. Ralph Lopez <br />Enclosures <br />5990 Greenwood Plaza Blvd. <br />(303) 850-0930 <br />Suite 250 Englewood, CO 80111 <br />Fax (303) 721-9298 <br />