Filling up when tanker is there?

I have heard it is not good to fill up your tank when a tanker is there unloading? Maybe stirs up sediment in the underground tank?

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I don’t for that reason. Is it a legit reason, don’t know, I figure better safe than sorry.

It’s hard to time gas stops by the Costco locations to coincide with the absence of tankers. It seems they are there 30-40% of the time I stop by for gas. I’ve never had a problem with contaminants from Costco.

What is the source of contaminants?
Granted it would be from rusting steel tanks but most/all of those tanks have been replaced.
Probably no longer a problem.

Water? Sand? Gasoline rises above water under quiet conditions, but if it’s being mixed by a turbulent inflow of new gasoline, it could be temporarily mixed together like salad dressing oil and vinegar .