EE INJURED HIS BACK ON SUNDAY MARCH 30TH, WHILE INSTALLING 60"" BELT STRUCTURE. HE STATES HE LIFTED STRUCTURE WITH A CO-WORKER (200 LBS) TO WAIST HIGH THEN PLACED ON A BELT RAIL WHEN HE FELT PA IN. THE IMMEDIATE SUPERVISOR AND WITNESSES SAID HE HAD BEEN COMPLAINING OF BACK PAIN OVER A PERIOD OF 3 DAYS.