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III IIIf IIIIIIIII III Doc Date:1211112001 <br />~~' 2.04.7 HYDROLOGY DESCRIPTION <br />• <br />Ground Water Hydrology <br />The Meadows No. I permit area is located on the east flank of the Hayden <br />Syncline where three consolidated aquifers are located within the study area. <br />The three aquifers include the Trout Creek sandstone, water associated with the <br />Pinnacle Coal seam and the Tow Creek sandstone. The geologic cross-section is <br />presented on Figure 2.04.7-1 and represents the subsurface geologic charac- <br />teristics for an area defined on Figure 2.04.7-2. <br />Thirty-seven drill holes (approximate 400-foot centers) within the permit <br />• <br />area did not encounter saturated or perched aquifers; however, drill holes <br />located downslope to the west of the permit area located water in geologic sec- <br />tions stratigraphically above the sections located in the permit area. Drill <br />hole depths and the penetrated strata are listed in Table 2.04.7-I, and repre- <br />sentative core data are described on Tables 2.04.6-1 and 2.04.6-2. All drill <br />holes were sealed and cemented above and below the sandstone in order to prevent <br />ground water quality contamination or water seepage. <br />Water was generally encountered within the Trout Creek sandstone in drill <br />holes located down-dip from the recharge area of the sandstone. The Trout Creek <br />recharge area appears to be located west and down-dip of the permit area. <br />Elevation of the water encountered was approximately at the top of the sand- <br />stone; however, documented depth-to-water measurements were not recorded during <br />the drilling program. <br />• <br />-84- <br />(Rev. 5/86) <br />