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.~ <br /> <br />prediction. Technical Revision # 46 was approved in October 1997 to <br />cease subsidence monitoring. <br />XVI. Concurrent Surface and Underground Mining <br />No specific approvals are granted under this section. <br />XVII. Operations on Alluvial Valley Floors <br />A. The Division has determined that an alluvial valley floor exists within the <br />affected or adjacent area. Therefore, the following findings are in order for <br />the alluvial valley floor known as The Picketwire Valley located along the <br />Purgatoire River. <br />The Division finds that activities proposed by the applicant will not <br />interrupt, discontinue, or preclude farming on the alluvial valley floors <br />that are irrigated or naturally subirrigated (4.24.3(1)). <br />2. The proposed activities will not materially damage the quantity or <br />quality of water in the surface or ground water system described <br />above (4.24.3(3) and 2.06.8(5)(a)(ii)). <br />3. The operation produced coal in commercial quantities and was <br />located within or adjacent to an alluvial valley floor prior to August 3, <br />1977 (4.24.3(4)(a) and 2.06.8(5)(b)(i)(A)). <br />Therefore the operations within a specific geographic area may continue <br />despite their proximity to an alluvial valley floor. The specific geographic <br />area has been delineated as the actual extent of mine workings on August <br />3, 1977 and adjacent area for which there existed substantial demonstrable <br />financial or regulatory commitment to mine in the future. (2.06.8(5)(b)(ii)(B)) <br />Surface coal mining and reclamation operations will be conducted to <br />preserve the essential hydrologic functions of alluvial valley floors outside <br />the permit area and to reestablish the essential hydrologic functions of <br />alluvial valley floors within the affected area throughout the mining and <br />reclamation process (4.24.2). <br />B. An environmental monitoring system shall be installed, maintained, and <br />operated by the permittee on all alluvial valley floors during surface coal <br />mining and reclamation operations and continued until all bonds are <br />released in accordance with Rule 3 (4.24.4). <br />XVIII. Operations on Prime Farmland <br />No specific approvals are granted under this section. <br />14 <br />