ON 5-9-03, INJURED WAS DISMOUNTING A D11 DOZER AND SLIPPED, TWISTING HIS BACK. INJURED INFORMED THE FOREMAN OF THE INCIDENT AND DENIED MEDICAL ATTENTION. ON 5-5-03 INJURED CALLED AND INFORMED ME HIS BACK WAS HURTING FROM THE 5-9-03 INCIDENT. HE WAS TAKEN TO C.F.O.H. AND DIAGNOSED WITH A LUMBAR STRAIN.