Superior , Wisconsin , spilling of about 22 ,000 gallons of aromatic concentrated into Nemadji River . Such concentrates involved several volatile organic compounds like benzene and toluene , two hazardous substances . Besides two derailments occurred in January and May , 1993 one , near the Wendover Canyon and Guernsey and another near Worland (Sweeney Smith , 1995 ) Such accidents caused spilling of more than 3400 barrels of oil into the North Platte River and a tributary of the Bighorn River . One of such cases involved forced...











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