A minus 3.0% street grade and a plus 2.0% street grade intersects at station 8+00 at elevation 1450 feet. It is necessary to pass under an overhead structure at station 9 + 00 with a 16 feet clearance. The elevation of the lowest bottom of the structure is at 1470 feet. Calculate the maximum length (feet) of the parabolic curve required to meet the given conditions.

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