A symmetrical parabolic curve passes through point A whose elevation is 23.33m at a distance of 54m from the PC. The elevation of the PC at station 4+100 is 22.56m. The grade of the back tangent is +2% and the length of the curve is 120m. 5. Determine the grade of the forward tangent. 6. Determine the stationing of the highest point of the curve.

The following table shows the stations and ordinates for a mass diagram. The free-haul distance is 600 ft. Overhaul cost is $12 per station yard. (a) Use the method of moments to compute the additional cost that must be paid to the contractor. (b) Sketch the ground profile if the finished grade of this roadway section is level (0 percent).