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XXI. Sealing of Drill Holes and Underground Openin es The specific findings required under this section which were made in the July, 1981 Findings Document (Renewal) have not been modified by the proposed revision, and those findings remain applicable. The operation is in compliance with the requirements of this section. XXII. Subsidence - Rules 2.05.6(6) and 4.20 Information submitted with proposed PR No. 2 indicates there is one structure, the Huntington Irrigation Ditch, in the permit area that has - the potential for mine related subsidence impacts. Impacts on this structure will be monitored by quarterly inspections of the ditch, quarterly visual inspections for evidence of subsidence features within the permit area, and a semi-annual survey of subsidence monuments. Repairs, if necessary, will be effected by the operator for the ditch and have the approval of the surface landowners. No renewable resource lands lie within the permit area. Information provided in the application indicates that the Pine Gulch drainage, which at one time was suggested to be a renewable resource area, does not in fact qualify as one. There is no aquifer or recharge area for an aquifer in the Pine Gulch area, Core hole data supplied with the application demonstrate that the bedrock section above the level of the coal is dry, The survey of wells and springs in the area of the mine has established that the water supplied by these for beneficial use is from stratigraphically lower aquifers or from alluvial aquifers whose recharge areas do not include Pine Gulch. The Pine Gulch area is also not one utilized for agricultural or silvicultural production of food and fiber nor does it serve as a pasture land. The confl uence of Pine Gulch and Hay Gulch approximately three miles downstream from the mine was determined to be an alluvial valley floor on which agricultural activities are conducted. These activities however, do not rely on the surface or ground water resources originating in the Pine Gulch area. Provisions of the proposed mining plan, furthermore, will minimize any potential for mining related subsidence impacts on the Pine Gulch Drainage. Elongated pillars will be employed to support all passages under the drainage. These pillars will not be extracted during final retreat. As a result, the Pine Gulch drainage area will be assured of continued long term stability. The proposed operation is in compliance with the requirements of this section. XXIII, Special Categories of Mining Other Than AVF and Prime Farmland - u es anD The specific findings required under this section which were made in the July, 1987 Findings Document (Renewal) have not been modified by the proposed revision and those findings remain applicable. The operation is in compliance with the requirements of this section. -11-