$1-.$ A standard penetration test is performed in a $150-$mm$-$diameter borehole. The borehole is $11\mathrm{.}0m$ below the ground surface. An automatic hammer with an efficiency of $92\%$ and a standard SPT sampler is used to perform the SPT$.$ The actual blow count $(N)$ is found to be $21.$ The soil is overly consolidated silty sand with an OCR of $1\mathrm{.}5.$ The unit weights of the soil above and below the groundwater table are $17\mathrm{.}8$ and $18\mathrm{.}5k\frac{N}{m}3,$ respectively with D$50$ of $0\mathrm{.}35mm.$ The groundwater is found at a depth of $5m$ below the ground surface. Determine N$60,($N$1)60,$ Dr$,$ and $\frac{O}{{?}^{\text{'}}}$ of this soil.