THE EMPLOYEE INFORMED US HE WAS HAVING TOO MUCH BACK PAIN TO REPORT FOR HIS AFTERNOON SHIFT ON 03/18/03. HE RELATES IT TO BEING JARRED PERIODICALLY WHILE HAULING SCORIA ROCK WITH A 657 SCRAPER ON 03/17/03. HIS NORMAL JOB IS SCRAPER OPERATOR, BUT DUE TO WEATHER CONDITIONS, HE SPENT MOST OF HIS SHIFT HAULING SCORIA. HE IS UNABLE TO RELATE HIS BACK PAIN TO ANY SPECIFIC TIME, PLACE OR