$2\mathrm{.}2$ Determine D$10,$ D$30,$ and D$60$ from the grain$-$size distribution curve. Show your work on the

graph.

$2\mathrm{.}3$ Calculate the uniformity coefficient, Cu$.$

$2\mathrm{.}4$ Calculate the coefficient of curvature, Cc$.$

$2\mathrm{.}5$ Determine the percentages of gravel, sand, and fines according to the USCS.