EMPLOYEE CALLED IN SICK ON 7/20, CAME TO WORK ON 7/21 TOLD SUPERVISOR HE WAS URINATING BLOOD & WAS GOING HOME. CAME TO PICK UP CHECK ON 7/22/04 & TOLD HIS SUPERVISOR HE HAD A BAD VERTEBREA & HAD TO BE OFF UNTIL 7/26/04. EE SAID THE BOUNCING ON THE SCRAPER DID NOT CAUSE IT BUT HE WAS NOT TO RUN THE EQUIPMENT UNTIL HE WAS WELL. ON 7/28 EE REPORTED HE HURT HIS BACK ON SCRAPER.