A690-ft-long equal-tangent crest vertical curve connects tangents that intersect at station 320+00 and elevation 1122 ft.

the initial grade is +4.5% and the final grade is-1.5%.

a) determine

a) the elevation of pvc (any method)
b) station of pvc (any method)
c) elevation of pvt (offset method)
d) station of pvt (any method)

b) using parabolic method, determine:

a) elevation of high point
b) station of high point

c) using offset method, determine:

a) the elevation of a point 220 ft from the pvc

d) graph the slope of the curve against the length of the curve (at each point on the graph, the corresponc slope should be indicated).