I'm glad your contractor is going to stand behind his work. I didn't have great clay, and I had a lot of rock.. Plus I was the contractor.. My neighbor was on one of the dozers. I depended on him for advice, and paid him well, but it's on me if I have a leak.. Are you still getting rain? We are, up by New London..
12 yr old pond, 1 ac, 15' deep. RES, YP, GS, FHM (no longer), HBG (decreasing), SMB, and HSB (only two have been seen in 5 yrs) I think that's about all I should put in my little pond. Otter attack in 2023.