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TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. <br />HEADQUARTERS: P.O. BOX 33695 DENVER, COLORADO 80233-0695 303-452-6111 <br />June 23, 2017 <br />Mr. Zach Trujillo <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining & Safetye1vVA) <br />Department of Natural Resources pac <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 'SoN 2 <br />iN°{R562RE: Colowyo Coal Company L.P. DAx,n1n9&"e <br />Permit No. C-1981-019 <br />Minor Revision No. 174 <br />CoRom In -Pit Drilling Program <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). Therefore, Tri-State on behalf of Colowyo is submitting this adequacy response <br />for minor revision 174 (MR -174) for Permit No. C-1981-019. Tri-State received your adequacy <br />letter dated June 20, 2017, and has prepared the following response: <br />1. The Division has performed a reclamation cost estimate to reclaim the 21 Collom in - <br />pit drill holes and associated roads. The total value of this estimate is $44,602.11 <br />(see attached cost estimate). The Division's cost estimate is consistent with previous <br />cost estimates approved by both the Division and Colowyo. The Division respectfully <br />requests a response from Colowyo with any questions regarding the cost estimate or <br />an acceptance of the Division's estimate. <br />Response: Tri-State and Colowyo have reviewed the reclamation cost estimate prepared <br />by the Division, which proposes an increase in the overall reclamation liability by <br />$44,062.11 and has the following comments on the cost estimate. <br />• The detailed Task 1 sheet was not included in the cost estimate and was not able <br />to be verified. Please provide the detailed Task 1 sheet for review. <br />• For Task 2 the Division estimated a loose volume of 20,328 cubic yards. Tri- <br />State believes this estimated volume is too high and it should be 13,552 cubic <br />yards. <br />• For Task 3 the Division estimated a loose volume of 7,744 cubic yards. Tri-State <br />believes this estimated volume is too high and it should be 5,969 cubic yards. <br />As discussed with the Division on June 21, 2017, the original submittal package for MR - <br />174 only included one rotary drill hole per pad and it should have included (some pads only) a <br />rotary drill hole and core drill hole. That being said, Exhibit 27, Item 3 has been updated with <br />the additional core holes that are planned to be drilled and the exhibit has been resubmitted under <br />AN EQUAL OPPORTUNITY /AFFIRMATIVE ACTION EMPLOYER CRAIG STATION ESCALANTE STATION NULLA STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. BOX 698 <br />A Touchstone Energy'COopemtive CRAIG, CO 81626-1307 PREWITr, NM 87045 NUCLA, CO 81424.0699 <br />970-824.4411 S05-876.2271 970-864-7316 <br />