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<br />_,._ <br />3. Rule 4.24.2 <br />Pursuant to Rule 4.24.2, the Division finds that surface coal mining and <br />reclamation operations will be conducted to preserve or restore, throughout <br />the mining process, the essential hydrologic functions of alluvial valley <br />floors. The only portion of the operation which is located on the AVF, the <br />natural geologic characteristics of the deposits will be preserved. Drainage <br />from the facility does not enter the AVF and is con taired within the active <br />mining area. Therefore, the quantity and quality of surface and subsurface <br />water supplied to the APF will not be significantly affected. <br />All material used to construct the crusher's pad will be removed and backfilled <br />in the abandoned pit. Alluvial soils that have been salvaged and stored <br />separately from other topsoil material :rill then be redisturbed to a depth equal <br />to predisturbance conditions. The area will be seeded with a compatible <br />pastureland mix which is suited to the environmental conditions found at the <br />site. <br />The topography of the area will not change. Therefore, the area will still be <br />suited to flood irrigation and will blend :with existing undisturbed pastureland. <br />Surface drainage wi1Z be such that it approximates the original drainage pattern. <br />4. Rule 4.24.5 <br />With the acceptance of the stipulations contained in the surface water, ground <br />water, and alluvial valley floor sections of this document, the applicant will <br />have sufficient monitoring to determine the effects mining will have on the <br />essential hydrologic functions of the alluvial valley floor. <br />I.Y. Assessment of Probable Hudrologic Consequences of Mining and Cumulative <br />Hydrologic Impacts - Rules 2.05.u'(3) and 2.07.6(2)(c) <br />Chimney Rock's proposed operation is the on.Zy coal mine Iocated in the Piedra <br />River drainage basin. Therefore, this operation is the only mine to be considered <br />in the cumulative impact assessment. <br />The probable affects of the existing and the proposed upper Barren Ridge mining <br />operations on tre ground i~;a ter reoime are projected to be negligible. As <br />discussed in the ground water section of this document, there are three aquifers <br />located in the proposed min_'ng area, the Pictured Cliffs sandstone, the <br />alluvium of Stollsteimer Cree}:,and the coal seams. The Pictured Cliffs sandstone <br />lies 40-50' be1o~: the lowest coal seam to be mined. The strata separating the <br />C seam from the Pictured Cliffs sandstone is impermeable. The mine does not <br />have surface facilities overlying or :rill not mine through the recharge area of <br />the Pictured CZiffs sandstone. The present active pit does not have inflows <br />from the floor strata, <br />