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<br />Prior to full extraction under the creek, a channel survey will be completed to enhance the information used in <br />the preparation of the probable hydrologic consequences section of this application. It should be noted that full <br />extraction under Fislt Creek will occur in panel 13 Right, which is not anticipated until 2001. <br />Fish Creek Alluvial Vallev Floor <br />The Fislt Creek alluvial valley floor will be undermined and subsided during the mining of panels 12 Right <br />tltrouglt 16 Right. The subsidence for the AVF will mirror that projected for the creek. The only impacts <br />anticipated for the valley floor will be limited pooling of water in the subsidence troughs created itt panels 13 <br />Right through 16 Right. No adverse impacts are anticipated for the limited extent of valley floor in panel 12 <br />Rig1n. <br />Presently, there are no irrigation headgates located within the panels. Tltis demonstrates that flood irrigation of <br />these bottom lands is not practical and that any enhancement of vegetative growth results from subirriga[ion. <br />The subsiding of the valley floor will increase the potential for subirrigation to occur. This results from the <br />establishment of the flow point out of the trough at the ga[eroad. This controls the elevation of the water in the <br />stream in relation to the area of the subsidence trough. As can be visualized, this leads to increasing the area of <br />potential subirrigation. <br />Ashlev impoundment and Ditch <br />The Asltle}~ impoundment and ditch will be undermined and subsided during mining of panel 12 Rigltt. The <br />location of the impoundment and ditch is shown on Map 23B, Structures and Renewable Resources. The <br />impoundment is of earthen construction, which will lend itself to easy repairs, if required. TCC leas undermined <br />two sediment ponds (Ponds M and K in Permit C-81-071) without causing damage to the structures. The <br />impoundment will be visually monitored while subsidence is occurring. <br />In reference to the ditch, it traverses portions of panels 12 Right and 13 Right. Subsidence of the ditch will <br />require re;rading or selective placement of a culvert to reestablish flow in [Ite ditch. The control plan for both of <br />these structures will be presented in the following section <br />(ii) If the description of worst possible subsidence consequences, prepared in accordance with Section <br />2.05.6(6)(b)(i), determines that no material damage or diminution of reasonably foreseeable use could result in the <br />event of mine subsidence within the permit and adjacent areas, and if the Division concurs with that conclusion, <br />the application shall <br />~R97-04 2.05-124(k) 3/28/97 <br />