EE WAS COMPLETING HIS SHIFT AND WALKED OVER TO THE CLINKER LOADOUT BLDG TO CHECK THE BINE LEVERL INDICATORS. THE INDICTORS ARE IN A SMALL ROOM IN THE CENTER OF THE STRUCTURE AND A RAILROAD TRU CK THRU THE MIDDLE OF THE STRUCTURE BUT IS SELDOM USED. POWDERED LIMESTONE DUST IS STORED IS OVERHEAD BINS AND SOME HAD SPILLED OUT ONTO THE FLOOR . IT WAS WET FROM RAINT HAT BLEW THRU THE DO