EMPLOYEE TOOK THE AIR TANK OUT OF HIS TRUCK DUE TO FROZEN WATER. WHILE PLACING THE TANK BACK INTO THE TRUCK, EE SLIPPED ON THE LADDER CAUSING HIS LEFT SHOULDER TO HIT THE TRUCK CAUSING THE INJ URY. THE TANK WEIGHED APP 25 LBS, AND THE HEIGHTTO CLIMB ON THE LADDER WAS APP 6 FT.