I want to say thanks to TJ. I talked to him tonight and he was soooooo helpful. Answered all my questions and some I didn't even know I had. I think he has set me on the path to solving my pond problems, even provided a suggestion on possible contractors. Turns out the sumac growing on the dam was indicative of the dam leaking. When I explained how the pond was built TJ explained that the guy who built the dam didn't compact it correctly among a bunch of other things. I should have done my homework better. I will keep the community up to date on the progress including pictures. May take a while but if the cost is reasonable I'm fixing it.