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Twentymile Coal, LLC. <br />Page 5 <br />September 29, 2015 <br />potential for adverse impacts to these sites from the anticipated mining -related <br />subsidence. TC is working with Metcalf to provide information on the <br />anticipated magnitude of subsidence in the subject areas as a basis for their <br />evaluation. Given the anticipated timing for processing the pending lease <br />modification application, it is anticipated that this assessment can provide for <br />review prior to any final approval. <br />ii. Division Response: <br />1. Section 2.04.4 of the permit has not been revised with PRI 0 to reference <br />and discuss the results of the supplemental cultural resource survey <br />covering the additional subsidence areas as indicated in your response <br />letter. Please revise this section of the permit to discuss the cultural <br />resources found within the proposed WCR affected area. <br />2. The Division received a letter from SHPO regarding the results of the <br />cultural resource survey, it is enclosed for your review. SHPO concurs <br />that sties 5RT3324 and 5RT3325 are eligible to be listed in the NRHP <br />and request that additional information regarding the nature and extent of <br />potential effects to these site be forwarded to their office for review. <br />Once TC and Metcalf Archeology have completed the analysis as <br />described in your response, please provide this information to the <br />Division for review and we will forward it to SHPO. If mitigation and/or <br />treatment measures are necessary for these sites, a discussion of such <br />measures will need to be included in Section 2.05.6(4) of the permit or <br />this section of the permit will need to indicate that mitigation or <br />treatment measures are not necessary. <br />This concludes the Division's review of TC's response to our fourth adequacy review letter. The decision <br />date for PR10 is October 19, 2015. If you need additional time to address any remaining issues and any <br />new issues identified in our review 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 <br />Enclosures: 1.) History Colorado (SHPO) Comment letter Dated September 8, 2015. <br />