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<br />The Rienau No. 2 underground mine is developed in the G seam, which outcrops <br />', one mile upstream of the Lower Curtis Creek AVF. The G seam is a groundwater <br />aquifer m the region and discharges along seeps and springs at its outcrop. During <br />1981, the Rienau No. 2 Mine drove a set of entries in an eastward direction under <br />Curtis Creek. At this time, the mine experienced greatly increased inflows of <br />water. Monitoring of the hydraulic head in a G-seam groundwater well downstream <br />of the entry showed the G seam to be dewatering. The dewatering of the G seam <br />decreased the discharge capacity of this aquifer. <br />The Division fords that: <br />1. Activities proposed by the applicant will not interrupt, discontinue, or preclude <br />farming on the alluvial valley floors that are irrigated or naturally sub-irrigated <br />(4.24.3(1)): <br />2. The proposed activities will not materially damage the quantity or quality of <br />water in the surface or groundwater system described above (4.24.3(3) and <br />2.06.8(5)(a)(ii)); <br />3. The proposed activities will comply with the requirements of the Act and the <br />Regulations with respect to alluvial valley floors (2.06.8(5)(a)(iii)); and <br />4. Surface coal mining and reclamation operations will be conducted to preserve <br />the essential hydrologic functions of alluvial valley floors outside the permit <br />area and to reestablish the essential hydrologic functions of alluvial valley floors <br />within the affected area throughout the mining and rechunation process <br />(4.24.2). <br />B. An environmental monitoring system shall be installed, maintained, and operated by <br />the permittee on all alluvial valley floors during surface coal mining and reclamation <br />operations and continued until all bonds are released in accordance with Rule 3. <br />The alluvial valley floor monitoring consists of monitoring discharges from the <br />sediment ponds (4.24.4). <br />A:\AiEERER.FD <br />IS <br />