Laserfiche WebLink
TRI -STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. <br />HEADQUARTERS: P.O. BOX 33695 DENVER, COLORADO 80233 -0695 303 - 452 -6111 <br />July 7, 2014 <br />l 4r, Rob Zuber <br />RECEIVED <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining & Safety <br />JUL 112014 <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver. CO 80203 <br />Division of Reclamation, <br />Mining & Safety <br />RE: Colowyo Coal Company L.P., Mine Permit C -1981 -019, Technical Revision No. 103 <br />(TR -103), E Seam End Wall Highwall Mining South Taylor Pit, Technical <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 />fbr TR -103 to Permit C -1 981 -019. Tri -State received your adequacy comments dated April 18, <br />1014, and the following responses have been provided to address your concerns: <br />�. A comparison of South Taylor Pit E Seam Floor Elevation (Figure ' in AA 's report) to <br />surface elevations provided on Map 23A indicates that as penetration depth of the highwall <br />miner increases, the amount of cover above the E seam decreases within the proposed highwall <br />mining area. If maximum penetration from the highwall miner occurs, the potential exists for the <br />highwall miner to mine through the surface of the slope opposite the entries. <br />Issue 1: Please explain if Colowyo intends to avoid this situation and, if so, how this will be <br />done. Perhaps the polygon on Map 23A showing potential highwall mining limits needs to be <br />adjusted. <br />Response: Colowyo will not mine past the oxidation/bum boundary while mining the E seam in <br />the South Taylor Pit. Therefore, Map 23A and Figure 10 in Exhibit 23, Item 1 have been revised <br />to reflect this mining limit. <br />2. Additionally, on Figure 10 in the .AA report it appears to the Division that some areas <br />within the highwall mining limit have little to no cover. Unfortunately the elevation lines on this <br />figure are not clear. <br />4'sue 2: Please provide an additional figure clearly showing the cover values. <br />Response: Figure 10 in Exhibit 23, Item 1 has been revised to clearly show the cover values as <br />requested. <br />N E I, ._i W,,)RTIW7 V AFFtgPotAMF Ai'tt( >!v FrIPL.)YEp CRAIG STATION ESCALANTE STATION NUCLA STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. BOX 698 <br />A Touchstone �tl irr� \���. 'Ooperatwe t CRAIG, CO 81626 -1307 PREWITT, NM 87045 NUCLA, CO 81424 -0698 <br />�__ 970 -824- 4411 505- 972 -5200 970 -864 -7316 <br />