EMPLOYEE ALLEGES THAT HIS BACK STARTED HURTING DUE TO EITHER CARRYING 50 LBS WET BAGS FOR STEM-MING OR SHOVELING STEMMING. THE EMPLOYEE BEGAN MISSING WORK ON 5/17/00; HE DID NOT REPORT ANY EVENT ON THE DAY HE ALLEGES AN EVENT HAPPENED. THIS EMPLOYEE HAD BACK SURGERY FOR AN OFF-THE- JOB INJURY IN NOVEMBER 1998.