Toss in all the Hydraulics,Oil and assorted What-Nots that make up a massive operation. However,for a plume like that to keep going,I've got a funny feeling there's alot more to the story !
It comes to mind that in Operations like that,Plastics are usually shredded and containerized by class. Once you get bulk amounts of that material going,it would create the plume that was seen. Fully involve,it becomes a hard seat of the fire to extinguish......Those Boys down there really had their hands full !