The are called Depressions here in TV.. PRetty common small ones. If they have been pumping under the house for 2 weeks I would be worried. They pump grout or flowable fill into the hole. They drill hole or pins then pump under the house into the void to make it solid. The company doing it should be earthtech, i am sure that was on the mixer I was talking to. If you live next to retention ponds keep an eye for the pond to lose all the water if it has been holding the water. If it drains it all out, you will be able to see a hole opened up ususally.
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