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TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. <br />HEADQUARTERS: PO BOX 33695 DENVER, COLORADO 80233-0695 303-452-6111 <br />September 3, 2015 <br />RE.fs <br />WW W.• r 7 <br />Mr. Rob Zuber <br />Environmental Protection Specialist SEP a <br />Colorado Division of Reclamation, Mining & Safety <br />Department of Natural Resources pIvision of & SafetYtc� <br />1313 Sherman Street, Room 215 NI'nln9 <br />Denver, CO 80203 <br />RE: Colowyo Coal Company L.P. <br />Permit No. C-1981-019 <br />Technical Revision No. 105 (TR -105), Post Mining Topography Modification <br />Adequacy Response <br />Dear Mr. Zuber: <br />Tri-State Generation and Transmission Association, Inc. (Tri-State), is the parent <br />company to Axial Basin Coal Company, which is the general partner to Colowyo Coal Company <br />L.P. (Colowyo). Therefore, Tri-State on behalf of Colowyo is submitting this adequacy response <br />for TR -105 to Permit No. C-1981-019. Tri-State received your email adequacy comment, dated <br />August 28, 2015, and is providing the following response: <br />The Division is correct that there was a networking issue in the SEDCAD model near <br />Stockpond 1. The networking issue has been corrected. However, correcting this <br />error caused some changes to the model which have been submitted herein. <br />Correcting this issue had negligible impacts of the overall results for the 100 year <br />and 10 year 24 hour model for the Streeter Ditch and Pond models. <br />As for the reduced flows that are occurring into the Streeter Pond in relation to the <br />Stoker Ditch confluence occurring below Stockpond 1, this is occurring because of <br />the reduced flows occurring farther upstream in Streeter Ditch from Stockponds 2 -4. <br />There is a further reduction in flows from the modeled 3 ac. ft stockpond instead of <br />the 2 ac. ft. that has been included in previous models. The Stoker Ditch contributes <br />a very minor amount of runoff when compared to the reduced flows from all 4 <br />upstream stockponds. <br />CRAIG STATION ESCAIANTE STATION NUCLA STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. BOX 698 <br />Tout h,t, air Lnt rL:N" l ." I ` r,attt c CRAIG, CO 81626-1307 PREWITr, NM 87045 NUCLA, CO 81424-0698 <br />„_ 970-824-4411 505.972-5200 970-864-7316 <br />