A site is underlain by a $18m$ thick sand layer with OCR$=1$ and friction angle $=41$ degrees. Under the sand layer lies a $20m$ thick layer of clay with OCR$=2,S_u=60$kPa, and friction angle $=36$ degrees. A square smooth concrete pile with width $=0\mathrm{.}3m$ and length $=12m$ is driven into the profile. Draw the pile and profile. Calculate the short term side friction resistance of the segment of the pile that is contact with the sand layer. Show your work and circle your answer.