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.. TRI- STATE _GENERATION AND TRANSMISSION ASSOCIATION, INC. <br />..' <br />HEADQUARTERS: P.O. BOX 33695 DENVER, COLORADO 80233 -0695 303- 452 -6111 <br />April 23, 2014 <br />Mr. Robert Zuber, P.E. <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining, and Safety RECEIVED <br />1313 Sherman Street, Room 215 <br />Denver, Co 80203 APR 2 4 2014 <br />Re: New Horizon Mine (C- 1981 -008) anon. <br />TR -63 Second Adequacy Review Response: p;vis�on of R &Sa {ety <br />Trench Drain Design w0n9 <br />Dear Mr. Boulay: <br />Western Fuels- Colorado (WFC) has received your secondary adequacy letter for TR -63, dated <br />April 16, 2014, and provides the following responses to your comments: <br />DRMS Item 1. In the cover letter of the submittal, there is a list of revised PAP materials, but it does not <br />include the proposed attachment. Is this all oversight? <br />Response: RESOLVED <br />DRMS Item 2. In the updated Table of Contents for Section 2.05.3(3), the list of maps creeds to be updated <br />to include all maps, including the proposed Map 2.05.3(3) -21. <br />Response: RESOLVED <br />DRMS Item 3. The text should include a discussion on the amount of cover oil the trench drain segments <br />and how this will prevent damage to the drains by reclamation equipment. <br />a. More information is required The added text only addresses cover oil the solid pipe. It <br />should also include a discussion oil the amount of cover on the perforated pipe segments. <br />Response: Please see the revised discussion including additional information relating to the depth of <br />cover over the perforated pipe segments on Attachment 2.05.3(3) -25-4. <br />DRMS Item 4. Regarding the text and Map 2.05.3(3) -21 in your submittal, please edit the confusing <br />nomenclature (or provide explanation) regarding the drains. Different terms tyre used: trench drain, rock <br />drain, rock dram. Are these terns interchangeable? <br />Response: RESOLVED <br />DRMS Item 5. Please explain the basis for selecting rock sizes shorn oil Details A and Bon Map <br />2.05.3(3) -21. <br />a. More information is required regarding the selection of rock sizes in the design. The <br />Division is concerned that placing the pipe in larger rock such as the 12 " —18 " rock shown <br />in Detail A will compromise the integrity of the pipe. Even the smaller rock shown in Detail <br />B nray be oversized <br />" CRAIG STATION ESCALANTE STATION NUCLA STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. BOX 698 <br />A ll Mt. I1,t011C E- .11Vr:;)' C r,iiI%t � CRAIG. CO 81626 -1307 PREWITT,NM 87045 NUCLA, CO 81424.0698 <br />•�, 970- 824 -4411 505 -972 -5200 970 - 864 -7316 <br />