A $400$ ft long equal tangent vertical sag curve connects two tangents: a $-2\mathrm{.}5\%$

downward tangent and a $+2\%$ upward tangent. The tangent intersect $($PVI$)$ at

station $426+25$ at an elevation of $945\mathrm{.}31$ ft$.$ The width of the paved surface is $48$

ft$.$ The pavement has an average sideward slope of $1\mathrm{.}6\%$ from the centerline

$($crown$)$ of pavement to the gutter inlet. Find the following:

a$)$ Station and elevation of BVC and EVC

b$)$ The station and elevation of the lowest point of the vertical curve.

c$)$ What is the elevation of the gutter drain inlet located at the side of the road at

the lowest point on the road?