The table below shows the slug test data. What is the hydraulic conductivity of the aquifer? Assume that the effective radius of the slug test, over which the head is dissipated, is equal to the length of the screen. $($You may use AQTESOLV$).$

$\backslash$table$[[$Time $($sec$),$Depth $($ft$),$Drawdown $($ft$)],[0,18\mathrm{.}4,1\mathrm{.}08],[15,18\mathrm{.}8,0\mathrm{.}68],[30,19\mathrm{.}07,0\mathrm{.}41],[45,19\mathrm{.}23,0\mathrm{.}25],[60,19\mathrm{.}31,0\mathrm{.}17],[75,19\mathrm{.}34,0\mathrm{.}14],[90,19\mathrm{.}4,0\mathrm{.}08]]$