At a waster site, a Hvorslev slug test was performed in a confined aquifer with a piezometer intake length of 20 ft and a radius of 1 in. The radius of the rod was 0.68 in. The following recovery data for the well were observed. Given that the static water level is 7.58 ft and H0 = 6.88 ft, calculate the hydraulic conductivity?

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145 175 101 |138 ì64 199 | | | TIME (s) 20 h (ft) 6.94 7.00 7.21 7.27 7.34 7.38 7.40