Agree with gehajake - it seems that if the liner is floating the ground beneath the liner is holding water. If it is possible it seems like it would be worth investigating as to why a liner was installed. The reason might be as simple as the prior folks wanted a pond with cleaner water or firmer bottom but there might have been more serious reasons. If the only reason you are buying the land is because it has the pond it seems like you need to know as much about the pond as possible. On the other hand it is usually good to own land. Enough speculation on my part - best of luck, sincerely hoping you get your pond!!
