looking for recommendation for foundation/porch evaluation

Hello neighbors- We've noticed a large, deep cavity of loose, wet soil in the ground near a corner of our porch. Our concern is a leak/sinkhole-type situation. We need someone to take a look and help us diagnose what is going on, if anything, and what, if anything, we need to do about it. Can anyone make a recommendation of someone who might be able to handle something like this? Thank you, ~ Sabrina