In 1990 in the Salt Lake City Basin, Yellow Freight had almost two million gallons of underground diesel storage. Some one turned them in to the Environmental Control District for dumping the used motor oil into the underground tanks with only a rough screening to block large debris from entering as well. They were mixing the used oil fifty-fifty and it burned well. We (me) were in the service industry at that time one hundred miles from their terminal and noticed while doing work on the different vehicles the amount of oil around and about the fuel tanks and asked several driver about this. The long and the short of this story is they had to stop direct mixing and sent the oil to another faciility for additional treatment which non of the drivers knew of, but the used oil from 150 larged trucks with the average being 13 gallons was mixed and burned very well by a large company trying to cut costs. thanks gaw
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