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- 10 - <br />The table shows that sandstone is the predominant rock <br />type of the barren member. If we include siltstone which <br />technically has a very similar character to sandstone, it is <br />evident that more than 40 percent of the formation is re- <br />presented by these rock types. It is also obvious, however, <br />that significant layers of shales and claystones will be <br />present within this member. It has to be expected that they <br />will form the weaker strata of the formation; they will also <br />significantly influence the hydrologic conditions. <br />2.3 HYDROLOGY <br />There are no detailed data available on the hydrological <br />conditions of the area of the future waste rock .storage. Only <br />limited and scattered data have been found in the reports on <br />the old investigations performed on the site. According to <br />most sources, ground water apparently does not exist within <br />the F coal seam. A limited amount of water can, however, seep <br />into the seam during periods of heavy rains or spring thaw <br />through the bedrock formations just above it. Topographical <br />conditions at the site, with the large flat bench above the <br />F seam, seem to be favorable to such conditions. It cannot be <br />ruled out that ground water does exist temporarily in the <br />F coal seam. Several piezometers installed close to the en- <br />tries of the proposed mines seem to confirm this assumption. <br />There are no data available on ground water conditions <br />between the surface and the F seam. All the formation can <br />possibly be dry; unfavorable geologic conditions where more <br />pervious layers of sandstone are interbedded with impervious <br />layers of shale or claystone could result in some additional, <br />even if limited, aquifers above the F coal seam. During the <br />~co++ra~o ea+w~nHC, wc. <br />