WASTE MATERIAL HAD BEEN DUMPED ON THE FLOOR OF HAZ WASTE BUILDING AND WAS IN THE PROCESS OF BEING MOVED TO APPROPRIATE PRECESSING BIN WHEN THE MATERIAL IGNITED. FLAMES WERE ESTIMATED TO BE AS HIGH AS 18 INCHES AND WERE QUICKLY EXTINGUISHED BUT SOME REIGNITED. THEY WERE ALSO QUICKLY EXTINGUISHED AND THE COMPLETE PILE AND SURROUNDING AREA WAS DELUGED WITH FOAM, DRY CHEMICAL & WATER.