There was an International Truck garage in town next to the river for 30 or 40 years. Behind the shop, the lot was pretty much paved in oil and grease soaked gravel from washing trucks and dumping waste. If you walked to the river after a rain, you could see a sheen from oil leaching into the water. The shop closed in the early 80s, the building was torn down, and the lot sat vacant for 10 years or so, as the city was trying to get federal money to clean up the site. They never got it, and eventually someone bought the property, hauled in thousands of yards of fill, covered it all up, and eventually a Bob Evans restaurant was built.
A similar thing happened a block away, also on the river, where a scrap yard sat for many years. After it closed, eventually the city bought it and put up a couple office buildings and parking lots there.