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U <br />Table 17-3 <br />Summary of Ground Water Aquifer Characteristics <br />• <br />• <br />Hydraulic <br />Conductivity <br />Geometric Mean <br />Aquifer Value (ft/day) <br />Overburden 0.67 <br />Dakota Coal 0.16 <br />Transmissive ty <br />Storage Coefficient Geometric Mean Hydraulic Gradient <br />2 <br />Geometric Mean Value Value (ft /day) Average Value (ft/ft) <br />1*70 4 26 .046 <br />1*10-5 2.6 .046 <br />17-5 Revised 04/11/88 <br />