Laserfiche WebLink
TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. <br /> HEADQUARTERS: P.O. BOX 33695 DENVER, COLORADO 80233-0695 303-452-6111 <br /> August 18, 2017 <br /> Mr. Brock Bowles <br /> Environmental Protection Specialist <br /> Colorado Division of Reclamation, Mining and Safety <br /> 1313 Sherman Street, Room 215 RECEIVED <br /> Denver, CO 80203 <br /> AUG '10 2017 <br /> RE: New Horizon Mine (Permit No. C-1981-008) <br /> Technical Revision No. 80 (TR-80) �iVision of Reclamation, <br /> 'N Mining&SafetytionSafety <br /> Adequacy Review Response <br /> Dear Mr. Bowles: <br /> Tri-State Generation & Transmission Association (Tri-State) has received your adequacy <br /> review letter for TR-80, dated August 11, 2017 and provides the following responses to your <br /> comments on behalf of the Elk Ridge Mining and Reclamation's New Horizon Mine. <br /> Table 2.05.3.0-3 Permit Area Culvert Designs, 0130-0181 &Associated Revised Pages 35-38 <br /> Average Land Slope is characterized for each of the culverts C134-137. <br /> 1. Please clarify,for each of the above mentioned culverts, what slope that culvert lies at and <br /> include that information in the culvert descriptions. <br /> Response: SEDCAD culvert designs have been included in Attachment 2.05.3(3)-1 for <br /> culverts C 134-C 137, which include the slope of the culvert. <br /> 2. Please also include tailwater and maximum headwater(ft.)for Culverts 134-137. <br /> Response: Tailwater and headwater information is included on the SEDCAD culvert <br /> designs, which have been included in Attachment 2.05.3(3)-1 for culverts C134-C137. <br /> 3. Please explain how maximum headwater elevation is arrived at. <br /> Response: The maximum headwater value for culverts C134-137 is the minimum depth for <br /> which the SEDCAD culvert design calculates a minimum pipe diameter of 18 inches. <br /> Table 2.05.3(3)-3 describes culverts C130 through C181. All culverts are described as CMP <br /> (corrugated metal pipe) with a specified diameter. DRMS finds that culverts 134-137 are <br /> described individually on pages 35 through 38 as HDPE (high density polyethylene pipes). Also, <br /> Bureau of Public Roads attachments (pgs. 23-30) specify CMP (corrugated metal pipe) while <br /> revised pages submitted call out HDPE pipe. <br /> 4. Please clarify culvert materials for said culverts and update table 2.05.3(3)-3 as needed. <br /> Response: The culvert list in the title block on Map 2.05.3(3)-1 has been revised to include <br /> culvert type(CMP, HDPE, etc.) and designation(permanent or temporary). Also,headings in <br /> Table 2.05.3(3)-2 and Table 2.05.3(3)-3 have been revised to remove references to CMP. <br /> AN EQUAL OPPORTUNITY/AFFIRMATIVE ACTION EMPLOYER CRAIG STATION ESCALANTE STATION NUCLA STATION <br /> "J P.O.BOX 1307 P.O.BOX 577 P.O.BOX 6% <br /> A Touchstone EnereC K)perative (@ y� CRAIG,CO 81626.1307 PREWITT,NM 87045 NUCLA,CO 81424.06M <br /> 970-824-4411 505-876-2271 970.864.7316 <br />