A rectangular excavation is needs to be $40-0$ X $60-0$ at the bottom the four sides require and angle of repose of $1$:$1.$ The excavation is $12-0$ deep. Calculate the amount of damp sand material that must be removed. Answer in BCY

Soil Type Damp Sand LCY $=2760$lbs$,$ BCY$=3130$ lbs$,$ CCY$=3362$ lbs$,$ Load Factor $\mathrm{.}85$