THE EMPLOYEE WAS OPERATING A HAUL TRUCK, APPROACHING THE DUMPFACE, WHEN SHE HIT A SOFT SPOT IN THE ROAD. THE TRUCK LURCHED TO ONE SIDE AND THE ELECTRICAL AND ENGINE POWER WERE LOST. SHE WAS DI SMOUNTING THE TRUCK AND NOTICED THAT THE LOWER PORTION OF THE DRIVER'S SIDE LADDER WAS MISSING.SHE CLIMBED BACK UP ON THE TRUCK USING PASSENGER LADDER, FELL TO GROUND APPROX 12 FEET.