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-3- <br /> Subsidence <br /> 6. As discussed above, under Surface Water Hydrology, and as we <br /> discussed at the May 3 meeting, it will be necessary for you to <br /> provide sufficient information to allow us to find that mining <br /> beneath Pine Gulch would not result in damage to the hydrologic <br /> balance outside the permit area. Measures to prevent damage may <br /> include a subsidence control plan. The limited extraction <br /> subsidence control plan depicted on Map C-12 should be discussed <br /> within the text of the revised application. Also, if there are any <br /> subsidence control techniques which would be applied to preclude <br /> damage at locations of higher cover beneath Pine Gulch, a <br /> discussion of them will aid us in our subsidence findings. <br /> Maps and Plans <br /> 7. All maps, plans and cross-sections submitted with the revised <br /> application will ultimately need to be certified. Those maps which <br /> reflect best professional judgment or projections based on <br /> available information can be certified as such, as discussed in our <br /> May 3 meeting. <br /> 8028F <br />