3 CONTRACTORS LISTED IN 11 WERE WELDING A EYE BOLT TO AN IBEAM AT THE COLLAR ELEVATION OF THE SERVICE SHAFT. THEY WERE USING A P5 ROD SPLATTER ROD WHILE WELDING SAME SPLATTER FELL DOWN THE SHA FT. AFTER WELDING, THEY NOTICED A SMALL BLUE FLAME A COUPLE OF HUNDRED FEET DOWN THE SHAFT. IT EXTINGUISHED ON ITS OWN.