EE WAS DRIVING A HAUL TRUCK FROM THE BENCH TO A WASTE DUMP WHEN HE HIT A BUMP IN THE ROAD AND THE SEAT BOTTOMED OUT THE OPERATOR INCURRED A LUMBO SACRAL STRAIN. SPEED OF THE HAUL TRUCK WAS APP ROX. 16 MPH. NO FRACTURE WAS FOUND ON X RAY. AN EXTENDED COURSE OF PHYSCIAL THERAPY WAS PRESCRIBED. DR ORDERS PREVENTED HIM FROM RETURNING TO WORK ON THE NEXT REGULARLY SCHEDULED SHIFT FOLLOW