Definately not carpenter ants, they are too small.

I would say they are fire ants or possibly acrobat ants. Could be pharoah ants, but I don't think so.

Fire ants still my best guess.

Usually when you find a site like this with ants, you can go to the exterior of the foundation and most likely find a large fire ant bed against the house.

The term "Exterminator" is not used much anymore, even though my PC business was named so.

Now the PC industry use more the term "Pest Contol" or "Pest Management".

The logic today is to maintain or to control the pests. You don't ever want to fully get rid of them because there is no ongoing monthly or quarterly checks to pick up from the customer.

Plus the chemicals now we use are designed to breakdown much faster than the so called "good ones" in the past we used.

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Rick Hurst_Home Works Inspection Co_Rockwall TX
In the words of Mike Tyson.... "Everyone has a plan until they get hit inda mouf"