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Twentymile Coal, LLC. <br />Page 2 <br />11/15/2016 <br /> <br />indicates all of the access roads are shown on Map 24A. Please update Map 24A or update <br />proposed Exhibit EX49S-F3 to show the location of the proposed light use road. <br /> <br />4. Proposed Revised page 2.05-84.6 and 2.05-32.5 indicates that thickener underflow pipelines will <br />be a double HDPE pipe system in “critical areas”. The cover letter for TR86 would indicate the <br />entire proposed pipeline would be a double HDPE pipe system. Please clarify, if the proposed <br />pipeline will be a double HDPE system, please revise the plan to indicate this. Or, explain what <br />criteria will be used to determine if an area is “critical” and thus warranting the installation of a <br />double HDPE system. <br /> <br />5. Thank you for forwarding the comment letter from the Colorado Parks and Wildlife (CPW) <br />regarding the proposed project. Based on this letter, CPW recommends restricting activities by <br />March 15 and that revegetation of affected areas be complete by March 1. I have confirmed with <br />Kris Middledorf with CPW that this restriction does not apply to the proposed borehole pad <br />option on the west side of RCR 27. Please update section 2.05.6(2) of the permit (page 2.05- <br />127.1) to indicate that construction activities for the borehole option east of RCR 27 will not <br />occur within the restricted timeframes specified by CPW. <br /> <br />6. Based on the CPW letter noted above, they recommended using two specific seed mixtures for re- <br />vegetation. These seed mixtures are similar to the Rangeland Seed mixture (Table 55) approved <br />for the site, however they are not the same. Please note that any change to the seed mixture <br />proposed for the site will need to be processed as a separate revision to the permit. <br /> <br />Maps <br /> <br />7. Based on the applicant’s completeness response, when the application was submitted, the tie-in <br />point was unknown and now the tie-in point will be north of Haul Road C. Proposed revised Map <br />24 Sheet 1 does not show this tie-in location. Please revise Map 24 Sheet 1 to show where this <br />tie-in location will be. Also, Figure EX49K-F1 shows the thickener underflow pipeline route <br />approved with MR223. Based on the information provided to the Division, the new tie-in <br />location should be in this area depicted by Figure EX49K-F1, given this, it would be appropriate <br />the update this figure. <br /> <br />Cost Estimate <br /> <br />8. The Division has conducted a reclamation cost estimate for the proposed revision. The estimate <br />is attached please let the Division know if you concur with the cost estimate. <br /> <br />This concludes the Division’s review of the technical revision application. The decision date for this <br />revision is January 6, 2017. If you need additional time to address the Division’s concerns please request <br />an extension of the decision date. If you have any questions feel free to contact me at (303) 866-3567, <br />extension 8120.