It’s possible and they mention in the article they have no background levels to compare it to.

Mainly because they have no idea where the soil came from other than it was somewhere near the derailment and has since been collected and moved offsite

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https://youtu.be/y6HMqbf7o7w is video one

Video two is 3 of the four cars weren’t even leaking, they released it and lit on fire anyways (17 min mark gets good, 22 min is the three cars… https://youtu.be/yvGxViPN4Iw

Ie. Your right, there was something going on beforehand and this was done on purpose

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