$($b$)$ Site Classification based on $I_{ss}$ and $y_s$

A site is located within Climatic Zone $4$ in Victoria. The results of the lab shrink$-$swell testing are attached below. As a geotechnical engineer, you are required to calculate the characteristic surface movement, $y_s$ and provide the site classification class to AS$2870(2011).$

$I_{ps}=3\mathrm{.}0\frac{\%}{p}F(depth0to0\mathrm{.}3m)$

$I_{ps}=2\mathrm{.}0\frac{\%}{p}F(depth0\mathrm{.}3to0\mathrm{.}8m)$

$I_{ps}=4\mathrm{.}5\frac{\%}{p}F(depth0\mathrm{.}8to1\mathrm{.}5m)$

$I_{ps}=3\mathrm{.}5\frac{\%}{p}F(depth1\mathrm{.}5to2\mathrm{.}4m)$

$I_{ps}=4\mathrm{.}0\frac{\%}{p}F(depth2\mathrm{.}4to3\mathrm{.}0m)$