Soil Layer Thickness $($m$)$

Fine sand X $=2\mathrm{.}47$

Clay Y $=2\mathrm{.}43$

Coarse sand Z $=4\mathrm{.}65$

The depth of the water table, Dw $=1\mathrm{.}28$ m$.$

A foundation load causes a stress increase of $29\mathrm{.}12$ kPa at a depth of $2\mathrm{.}92$ m$.$

What is the value of excess of pore water pressure $($in kPa$)$ at a depth of $2\mathrm{.}92$ m immediately after the application of the foundation loading?