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Back in the pre-EPA days, it was fairly common to dump waste engine oil onto the ground. A circa 1925 image showing a Yankee Filling Station located on Wells Street next to the Park River in Hartford, CT. Oil drums visible point to were gas station employees dumped used oil and gear lube over the bank in two spots. Note the glistening appearance the oil adds to the rock retaining wall before it drains down into the river. The H.G. Murk & Co. next door was located at 25 Wells St. in the Capital City.
There are places, especially Los Angeles, next to some schools too, that oil, asphalt, and other petroleum seep up to the surface. In some cases it is so flammable it can be lit on fire. All natural.
Of course now we have a much better understanding of water/chemical underground “plumes” and how years after the Air Force dumped all manner of chemicals into the ground, groundwater used for human consumption has become unfit for any animal. We have a few of those exact problems here in Sacramento.
Back in the “old” days, you could always find the carrier by spotting the trail of trash that was thrown overboard.
When I was young my father use to spray our waste oil along the tracks behind our house to keep the weeds down until.......my mother discovered wild asparagus on the hill. He found someone that would take it to burn in a waste oil heater.
Our harbor was polluted for many years. Clean up has been ongoing, but should be completed soon. The company doing the clean up spent a lot of $$ at my former place of employment. We did a lot of machine work, and some fabrication of parts and pieces for their equipment. When they broke something, they needed a repair or replacement fast!