Subsequent stations possess the same cross$-$section. The cross$-$section consists of $3$ ft of fill from the existing flat ground at the centerline, a $\backslash (2\backslash \%\backslash )$ cross slope is present for water drainage across each $12\text{'}$ wide driving lane on either side of the centerline and a $\backslash (3$: $1\backslash )$ slope is present for each shoulder between the driving lane and the reach the existing ground surface. The cross$-$sectional area of the fill placed at each station is most nearly $($in units of $\backslash (\backslash$mathrm$\{$ft$\}^\{2\}\backslash ))?$