ON 7-9-02, EE WAS RIDING THE MANTRIP FROM THE EE PARKING LOT TO THE PIT & THE MANTRIP HIT A HOLE IN THE ROAD, BOUNCING HIM OUT OF HIS SEAT. EE INFORMED ME HIS BACK WAS HURTING ON 7/25/02. HE WAS TAKEN & EXAMINED BY A DR. X-RAYS WERE NEG. AND HE WAS DIAGNOSED WITH A LOMBAR STRAIN.