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. As previously described, four monitor wells and one surface <br />water monitoring site will be maintained. Through this monitor <br />system, maximum and minimum discharge conditions can be identified <br />and any seasonal variations in water quality will be documented. <br />This monitor program will be maintained throughout the life of the <br />mine to detect any quality or quantity changes in either the <br />surface or groundwater regime as mining progresses. <br />HYDROLOGY OF PIT 2 - FEDERAL COAL LEASE N0. C-30168 <br />Groundwater <br />Geologic Setting. <br />The general stratigraphy within the lower portion of the <br />Coalmont Formation consists of a sequence of highly interbedded <br />and generally lenticular sandstones and siltstones. This relation- <br />. ship is naturally restrictive to groundwater movement both parallel <br />to and perpendicular to bedding. Because the lease area lies on <br />the nose of the McCallum Anticline which has been eroded along its <br />crest, the older Upper Sandy Member of the Pierre Shale is exposed <br />at the surface. The Sudduth Coal and younger interbedded sandstones <br />and siltstones are exposed down dip along both the nose and the <br />east and west flanks. Strike of the beds in the lease area ranges <br />from about N50°E at the southeast edge of the area to about N20° <br />W at the extreme north edge of Pit 2. The strike continually <br />changes between these two figures as you progress along the subcrop <br />around the nose of the anticline. Dips on the strata range from a <br />minimum of 4.70 on the nose to a maximum of about 25° near the <br />northern edge of the proposed permit area on the western flank. <br />Faulting occurs on the nose of the structure as well as on the <br />eastern flank south of Pit 1. Additional faults are likely to be <br />encountered during mining both in the vicinity of the nose as well <br />u <br />-56- <br />