$10-1.$ A $12-$in$.$ square concrete pile is driven into loose sand to a depth of $30ft.$ Soil conditions are shown in Figure $10-34.$ Find the pile's axial capacity if $K$ is assumed to

be $0\mathrm{.}7$ and the factor of safety is $2$

$.$

$10-2.$ Rework Problem $10-1,$ assuming that the groundwater table is located $5ft$ below the ground surface.