EE WAS READY TO CLEAN OUT SUMP & HAD TO PULL A PUMP OUT OF THE MUCK, & LIFT IT TO A LEDGE ABOUT 4' HIGH. HIS RIGHT FOOT SANK IN THE MUCK PILE & PUT HIS BACK INTO A TWIST. HE FELT PAIN IN HIS LOWER BACK & DOWN HIS RIGHT LEG. HE WAS STILL EXPERIENCING PAIN & WENT TO SEEK MEDICAL ATTENTION ON 4/8/04 & WAS PUT ON RESTRICTED DUTY.