A vertical curve of 600 ft in length is used to connect two tangents with the following locations: Tangent 1.- Point 1, Sta = 59+00, El = 1250.0' Point 2, Sta = 72+00, El = 1190.0' Tangent 2.- Point 1, Sta = 72+00, El = 1190.0' Point 2, Sta = 84+00, El = 1260.0' Determine the amount of cover over a culvert, 6 ft in diameter, that is located at Sta = 72+35 and El = 1188.0' c-c.