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Foidel Creek/Middle Creek No specific subsidence control plan is proposed for Foidel or Middle Creek. Recommendations presented in Exhibit 7i, Subsidence Effects on Streams, call for channel morphology to be evaluated if headcutting or incising of the channel occur for more than 400 feet from the point of origin of the headcut. Any proposed mitigation would be based on the results of this evaluation. Lieske headeate and USGS water monitoring site 700 These two structures will be monitored to detect damage or improper function. If function is impaired, each will be re-aligned or re-leveled, as necessary, prior to seasonal use periods. 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, prevent material damage, or mitigate the effects. A detailed description of the monitoring program for each structure within the Eastern Mining District begins on page 2.05-182 of the permit application. The results of the monitoring program will be submitted to the Division semi-annually. Exhibit 34 of the pennit 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 The Division has previously granted a variance from contemporaneous reclamation for portions of the permit area in order that underground mining can be developed. This variance applies to the Area 2 pit and associated spoil from the CYCC Mine No. 1, Mine No. 2, and Eckman Park operation. Currently this area is occupied by the portals as well as other facilities necessary to the Foidel Creek operation. TCC will be responsible for the reclamation of this area when underground mining operations have ceased (4.22.2). The Division finds that the requirements of Rule 4.22.3 have been met. XVII. Auger Mining The requirements of this section do not apply. XVIIL Operations on Alluvial Valley Floors Alluvial Vallev Floor Identification 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). 24