Q$2.$ The particle$-$size distribution $($PSD$)$ curves for six soils are provided in the plot on the next page.

For each soil:

a$)$ Determine the effective size $(D_{10}),D_{30}$ and $D_{60}$ and calculate the uniformity coefficient and the coefficient of curvature.

a$)$ Determine the percentages of gravel, sand, fines, silt, and clay as per USCS.

b$)$ Classify the soil by the USCS and provide both the group symbol and the group name.

$\backslash$table$[[$Property$,$Soil $1,$Soil $2$