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State Reg. <br />• The middle coal group occurs in a 400-foot sequence of sandstone and <br />shale with lessor amounts of sandy shale (Bass et. al., 1955). Within This <br />group, the Lennox, Wadge, and Wolf Creek seams are three coal beds of <br />economic interest at the Seneca II Mine. The Lennox coal seam is the <br />uppermost seam in the middle coal group and lies approximately 50 feet <br />above the Wadge coal seam. It ranges in thickness from 2.5 to 5.5 feet, <br />and has the poorest lateral continuity and coal quality of the three seams <br />to be mined. For the most part, the Lennox seam outcrops at lower <br />elevations near valley bottoms, and therefore, removal of this seam will <br />not be extensive. Lennox coal overburden strata consist primarily of a <br />thin sandstone unit overlain by a thick sequence of marine shale. These <br />units are illustrated in Figure 6-3. <br />The Wadge coal seam is the principle coal seam to be mined due to its <br />uniform coal quality and thickness (9 to 10 feet). It outcrops updip of the I <br />Lennox crop line roughly midway up the flank of the Tow Creek ' <br />• Anticline. The Wadge coal seam is considered to be a potentially signifi- <br />cant aquifer in the mine plan area, but not in the general area. Amore ' - <br />detailed discussion of the hydrologic aspects of the Wadge coal seam is <br />provided in Tab 7, "Site Specific Ground Water". Wadge overburden <br />strata consist of a moderately thick sequence of very fine-grained, low <br />porosity sandstones and siltstones with thin interbedded shales (see <br />Figure 6-3). These strata forma laterally persistent unit, although <br />thickness and lithology may vary because of depositional environment. ~ <br />This unit outcrops between the Wadge and Lennox croplines as shown in <br />Exhibit 6-2. It is also considered to be an aquifer based on its water <br />yielding ability and water quality. Reference should be made to Tab 7 <br />for more information concerning its hydrologic properties. <br />The Wolf Creek seam is the lowest coal seam to be mined at the <br />Seneca II permit and lies approximately 150 feet below the Wadge <br />seam. Thickness of the Wolf Creek seam averages 15 feet and outcrops <br />near the crest of the Tow Creek Anticline in the riortheast part of the <br />• permit area (see Exhibit 6-2). It is overlain by a sequence of lenticular <br />sandstones, siltstones, shales, and thin coal beds. Both the Wolf Creek <br />6-5 Revised 5/27/1981 <br />