EE WAS LOADING THE EXPLOSIVES TRUCK. WHEN HE RAISED THE HANDLE OF THE POWDER BIN (WHICH ALLOWS AMONIUM NITRATE TO FLOW INTO THE TRUCK) HE FELT ASHARP PAIN IN HIS LOWER BACK. HE DROVE HIMSELF T O THE HAZARD ARH WHERE HE WAS TREATED FOR A PULLED MUSCLE IN HIS BACK AND RELEASED.