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TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. <br /> HEADQUARTERS: FO. BOX 33695 DENVER, COLORADO 80233-0695 303-452-6111 <br /> August 13,2019 <br /> Mr. Zach Trujillo <br /> Environmental Protection Specialist <br /> Colorado Division of Reclamation,Mining&Safety <br /> Department of Natural Resources <br /> 1313 Sherman Street,Room 215 <br /> Denver,CO 80203 REC ! TD <br /> RE: Colowyo Coal Company L.P. AUG 16 20 19 <br /> Permit No.C-1981-019 <br /> Technical Revision No. 132 DrOSION OF RECLAMATION <br /> Adequacy Response MINING AND SAFETY <br /> Dear Mr.Trujillo, <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). Tri-State received your adequacy letter dated August 13,2019 and is providing <br /> the response below to your adequacy concern on behalf of Colowyo. The Colowyo Mine <br /> operates under Permit No. C-1981-019. <br /> 1. When reviewing the proposed Exhibit 7—Hydrology Information, it appears that Lower <br /> Administration Building Small Area Exemption and Haul Road A Upper and Lower <br /> Ditches Exhibits have been left out of the Table of Contents under Volume 2B.Please <br /> provide an updated Exhibit 7—Hydrology Information to include the missing exhibits. <br /> Response: Exhibit 7 Table of Contents has been updated as requested. <br /> 2. It appears to the Division that the watershed acreage in the proposed Exhibit 7—Table 6 <br /> and the proposed Exh. 7—Sec 16—Figure 2 do not match up. The following tables shows <br /> the acreage discrepancies. <br /> Watershed Area-Section 16 Pond <br /> Table 6(acres) Exhibit 7—Section 16 <br /> (acres) <br /> Designation <br /> Topsoil/Seed 24.7 21.9 <br /> Undisturbed 36.6 81.1 <br /> 1-2 Yrs. 29.1 39.5 <br /> 3+Yrs. 194.9 38.6 <br /> Total Area 285.3 269.1 <br /> Response: The subwatershed acreages on Exhibit 7—Table 6 has been corrected as <br /> noted.However, as shown on the revised Table 6 the overall total of subwatershed <br /> acreage reporting to the Section 16 Pond in the post-mining condition is 268.1 acres. It is <br /> AN EQUAL OPPORIIMWTY l AFFIRNATIVE ACTION ElIPI.OYER CRAIG STATION ESCALANTE STATION NUCLA STATION <br /> ZI <br /> P.O.SOK 1907 RO.SOX!77 •.O.!ox as <br /> A Touchstone EnerWCooperative ' Oft".CO 4+6161307 "Wwrt,11M 47WS M CLA.to nu4-x430— 97604-"11 Wsanrnl 970-93079" <br />