$1.$A$.$ Use the Burland$-$Burbidge method to estimate the expected settlement for a square foo $8ft.$ by $8ft$ in plan, that is at the interior of a building. Footing thickness is to be assumed to and bottom of the footing is to be set $4ft.$ below ground surface. This footing will have a des contact pressure of $3\mathrm{.}5tsf.$ It will bear on the natural sand soil represented by test boring B$($copy of log attached$).$ You must use your assessment of soil conditions to determine the ap unit weight to use. Sand has an average $N-$value $($made with the donut hammer$)$ of $21$ blows through the depth of concern for settlement. You will need to determine the N$6$O values. Groundwater is at depth indicated on the boring log: Use the time factor for $50$ years. $1.$B$.$ The settlement you calculated was determined to be too much, so you have decided to and reduce the contact pressure to a lower value of $2\mathrm{.}25tsf.$ For the same overall column lo footing has to be bigger in plan dimension$),$ how much settlement is now calculated?

$1.$C$.$ How much settlement would be estimated to occur for the building's planned wall footin which will be a continuous wall footing, with width of $3\mathrm{.}0ft$ and contact pressure of $2\mathrm{.}0tsf?$