SUPERINTENDANT WAS CONTACTED BY FILL DOZER OF EE TO COME TO THE FILL BECAUSE INJURED EE HAD SUPPOSEDLY FALLEN OUT OF THE DRIVERS SEAT OF HAULAGE TRUCK, HE HAD FALLEN TO THE GROUND WHILE TURNIN G THE TRUCK TO PREPARE TO DUMP. EE REPORTED HE INJURED HIS RT. LEG. OPERATOR WAS NOT WEARING A SEATBELT.