The sink hole appeared again the the back yard, smaller this time but it was back. We had the septic tank people come out a while ago to fix it, but I guess he didn't fix all the gap. When I dug up the tank, which was abandoned many years ago when we hooked up to city sewer, I found this gap in the lid. The repair guy stopped about 18 inches short of completing the job properly.
So I mixed up the rest of the concrete I had from pouring the front step and some fast drying hydraulic cement and put a garbage bag on top of the crack so the concrete wouldn't just run into the crack and poured it on top. It hardened on the bag and should stop the dirt from washing into the tank. Only time and rain will tell if I did the job right.
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