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2.7.5.3b Ground -Water Levels, Eastern Expansion Area <br />The ground water elevations of the eastern expansion area are depicted in the current Annual <br />Hydrology Report and Map series M54. Current projected potentiometric elevations from the 2013 AHR <br />(Tit -113) were used to develop the updated M54 map series. Subtle variations in the geologic setting as <br />detailed in permit sections 2.7.5.1, 2.7.5.1a and 2.7.5.1b indicate some changes in the location of the <br />potentiometric contours as the aquifers progress to the east. Additional monitoring will better define <br />the areas. Future analysis of the area will be included at a future date in this section. <br />Within the eastern expansion area the same principles of subsurface water flow and the hydrologic units <br />detailed within permit sections 2.7.5.3 and 2.7.5.3a can be applied to the area. Preliminary modelling of <br />the coal seams and strata present in the expansion area do not indicate any drastic change to the <br />established hydrologic units of the Upper Williams Fork Formation. Subtle variations may occur <br />anywhere in the aquifer but current modeling utilizing the H, I and Q seams was used to extrapolate <br />water level elevations for Map M54 within the eastern expansion area. A subtle arc of the geology to <br />the northeast carries the potentiometric surfaces in the same general direction. In this area the Big <br />Bottom Syncline is diminishing and the northerly dip of geologic strata begins to level out when <br />compared to the existing permit area. The area continues this trend as the strata continues east for <br />some distance. Current water level elevations taken within the far eastern portion of the existing permit <br />boundary are relevant to the eastern expansion area. Wells such as GP -7 and 8 have shown only slight <br />natural variations in water elevation for many years. Long term water elevation data is contained in the <br />current AHR (TR -113) in Appendix W of the permit. <br />Revision: P� - n 7 <br />2 -523y <br />Approved. <br />