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State Reg. <br />coal seam and overburden are not considered to be aquifers based on the <br />discussion of their water bearing properties in Tab 7. The lithologic <br />character of these units in relation to other strata within the permit area <br />is shown in Figure 3. <br />The strata immediately below the Woif Creek seam consists of a black <br />carbonaceous shale underlain by an alternating sequence of sandstone, <br />siltstone, and shale with minor impure coals. In overburden core 2424-E <br />(GW-S38), the base of the Wolf Creek seam is located 66.5 feet above the <br />Top of the Trout Creek sandstone. GW-S5 shows 78 feet for this interval, <br />thus thickness of the Wolf Creek underburden strata may be highly <br />variable. <br />The top of the Trout Creek sandstone marks the formational contact <br />between the Williams Fork and Iles Formations. This unit is considered <br />to be the first aquifer below the lowest coal seam to be mined at the <br />• Seneca II permit. It is a thick (120 feet), massive, well to very well <br />sorted, fine-grained, glavconitic sandstone which forms prominent cliffs <br />where it outcrops. The extent of its outcrop is shown in Exhibit 6-12. <br />All of the above information was derived by extensive drilling and coring <br />programs conducted by Seneca Coals, Ltd. Specific lithologic descrip- <br />tions for observation wells may be found in Appendix 7-l. These wells <br />are located in Exhibit 7-2. Exhibit 6-2 shows the location of drill holes in <br />the mine plan area. Geophysical logs performed on some drill holes are <br />available on request. <br />Six geologic cross-sections (A-A' to F-F') have been drawn to examine <br />structural and depositional relationships at the Seneca II permit (see <br />Exhibits 6-3 through 6-8). The locations of the cross-sections are given <br />on Exhibit 6-2 in addition to Exhibits 6-9 through 6-I I, which are top of <br />coal-structural mop, overburden isopach and coal isopach, respectfully. <br />The cross-sections which were drawn perpendicular to strike (cross- <br />• sections A-A', B-B', C-C', D-D', and E-E') generally run west to east with <br />F-F' running south to north parallel to strike. Appendix 6-I contains the <br />appropriate drill logs for all cross-sections which are typical of these <br />areas. <br />6-7 Revised 5/27/1981 <br />