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DocuSign Envelope ID:66E3F8D2-OB9D-4164-B9A2-3CDDE03479A3 <br /> 1 <br /> 141411TRI-STATE <br /> December 19,2022 <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 <br /> RE: Colowyo Coal Company L.P. <br /> Permit No. C-1981-019 <br /> Permit Renewal No. 08 (RN-08) <br /> Third Adequacy Response <br /> Dear Mr. Trujillo, <br /> Tri-State Generation and Transmission Association Inc. (Tri-State),is the parent company to Axial <br /> Basin Coal Company,which is the general partner to Colowyo Coal Company L.P. (Colowyo). Therefore, <br /> Tri-State on behalf of Colowyo is submitting this third adequacy response for permit renewal 08 (RN-08) <br /> to Permit No. C-1981-019. <br /> Tri-State received the Division's third adequacy letter dated October 28, 2022 and is providing <br /> responses to the Division's concerns below. Adequacy comments 2 through 9 have been deemed satisfied <br /> and are not included with this adequacy response. <br /> 1. Division: The Division has reviewed Colowyo's reclamation plan and associated reclamation <br /> cost estimate. The reclamation parcels for the West Pit and South Taylor Pit were last updated <br /> with AR?-243 when reviewing Map 29. Based on the reclamation progression of the West Pit and <br /> South Taylor Pit, these parcels no longer match last site wide cost estimate performed with <br /> Colowyo Mine RN-07. In order for the Division to perform an accurate updated reclamation cost <br /> estimate for the Colowyo Mine,please provide the Division with the volumes associated with the <br /> each of the reclamation parcels for the West and South Taylor Pits as shown on approved Map <br /> 29. <br /> Colowyo:A spreadsheet has been provided to the Division which contains all cut/fill balances <br /> and centroid to centroid haul; distances for all the polygons shown on Map 35A. <br /> Division: Based on the provided information, the Division has performed an updated <br /> reclamation cost estimate for the Colowyo Mine. The total value of this estimate is <br /> $164,132,650.00 (see attached cost estimate). The Division's cost estimate is consistent with <br /> previous cost estimates approved by both the Division and Colowyo. Attached is a change sheet <br /> showing changes and updates from the last site wide estimate performed with Midterm No. 8. <br /> P.O.BOX 33695 <br /> DENVER,CO 80233-0695 A Touchstone Energy <br /> 303-452-6111 Cooperative <br /> b R K` <br /> WWW.TRISTATE.COOP <br />