He said that he has sealed about 10 this way. Of course I am skeptical. After spending about $30,000 with another local contractor I am very gun shy at this point. I think I am not going to run power down behind the dam and try and pump the water back in. The more I thought about it that didn't seem like the best idea. I think there has got to be a way to seal this pond. I just need to find someone who actually knows what they are doing to get out there and fix it.