2013-10-08_REVISION - C1982056 (22)

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2.The applicant has proposed a subsidence control plan in accordance with Rule 2.05.6(6) and has committed to adopt all measures in order to reduce the likelihood of subsidence, to prevent material damage, and to mitigate the effects. A detailed description of the monitoring program for each structure within the Western Mining District begins on page 2.05-182 of the permit application. Exhibit 25Z provides additional review of the proposed subsidence anticipated with the Western Mining District. The results of the monitoring program will be submitted to the Division semi-annually. Exhibit 34 of the permit outlines the requirements for the subsidence report. The Division proposes to approve the plan (4.20.1(2) and 4.20.3(1)). XVI. Concurrent Surface and Underground Mining No specific approvals are granted to the applicant under this section. XVII. Operations on Alluvial Valley Floors Information pertinent to alluvial valley floor (AVF) determinations is provided in the permit application on pages 2.06-6 through 2.06-25.4, Exhibit 42a (EMD Alluvial Valley Floor Determination), Map No. 5 (Surface Geology), Map No. 15 (Alluvial Valley Floors, Land Use and Water Rights) and the supplemental report of September 22, 1986, "Material Damage Standard for Irrigation", and Map No. 13 (Twentymile Park Hydrology). Potentially affected portions of Foidel Creek, Middle Creek, Fish Creek and Lower Trout Creek stream valleys have previously been evaluated with respect to AVF criteria in a number of coal permits, including Twentymile Coal Company's Foidel Creek Mine (C-82-056), Twentymile Coal Company's Fish Creek Tipple (C-81-036), Colorado Yampa Coal Company's Eckman Park, Mine No. 1, and Mine No. 2 (C-81- 071) and Colorado Yampa Coal Company's Energy Mine No. 3 (C-84-062). Numerous areas meeting the criteria for potential AVF's exist in the permit and adjacent area. The Division has made the finding of the presence or absence of AVF's as detailed in the following sections. AVF Determination - Positive Determination Fish Creek Based on existing and potential flood irrigation and sub-irrigation capabilities, the Division has determined that Fish Creek is an AVF above, within, and below the permit area, downstream to its confluence with Trout Creek. This area is delineated on Map 15 of the PAP, Alluvial Valley Floors, Land Use and Water Rights. PR-05 approved expansion of the mine plan into the Northern Mining District (longwall panels 12 Right to 16 Right) which underlies the Fish Creek AVF. By PR-06, further undermining of the AVF by panels 17 Right and 18 Right was approved. The 35 Foidel Creek MineOctober 8, 2013