Concrete base problem in garage shop. Any construction folks?

Just a note to the folks thinking about getting concrete or footer work done. Actually, any kind of work. I have the DIY curse in that I do everything and can count on one hand, the times I've had to hire someone. It's very rare to find a tradesman that really has pride in their work. If ya have one, you're lucky. Although I have built and helped build several structures, I never paid attention during the foundation part. My advice, learn everything you can about your project and question anything that doesn't seem correct. I didn't know that 25 years ago when I built the garage. Now you see the mess I'm dealing with. My unsolicited advice. Craig