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Twentymile Coal, LLC. <br />Page 4 <br />11/29/2016 <br />b. Division Response: Revised Map 24, Sheet 1 was not certified by the registered <br />professional engineer as required by Rule 2.10.3(2). Please submit a signed copy of the <br />map. The Division disagrees with your response regarding Figure EX49K F1. However, <br />the label added to Map 24, Sheet 1 shows the tie-in location which clarifies the pipeline <br />location/tie-in which was the Division's primary goal. Updating Figure EX49K F 1 <br />would make Exhibit 49K consistent and representative of the Thickener Underflow <br />Pipeline at this location, but is not necessarily essential and therefore the Division will <br />not require TC to update Figure EX49K F 1 at this time. <br />Cost Estimate <br />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 />a. TC's Response: We have reviewed the Division's cost estimate, and accept it as a <br />reasonable representation of the associated project reclamation costs. <br />b. Division Response: Noted. <br />This concludes the Division's review of the technical revision application adequacy review response letter <br />dated November 22, 2016. The decision date for this revision is January 6, 2017. If you need additional <br />time to address the Division's concerns please request an extension of the decision date. If you have any <br />questions feel free to contact me at (303) 866-3567, extension 8120. <br />Sincerely, <br />Jared Ebert <br />Environmental Protection Specialist III <br />