ON 3/1/04 @ SHARPS QUARRY, EE WAS HAULING OVERBURDEN AS PART OF STRIPPING PROCESS. DURING HAULING HE TRAVELED THROUGH A MUD PUDDLE, THERE WAS A SOFT SPOT, WHICH CAUSED ONE OF THE TIRES TO DIP WHICH CAUSED THE TRUCK TO JERK. THIS JERKING ACTION CAUSED EE TO BE WHIPPED IN OPERATOR'S SEAT WHILE BELTED, CAUSING THE STRAIN TO LOWER BACK. EE DECLINED TO GO TO DOCTOR UNTIL 6/17/04.