George
Have one of your local pond guys sound the pond with 2" black pipe around area where you suspect leak they should be spaced approx. 3 foot apart.and put in at same depth.

Scott Trava
Catskill Pond

Scott Trava
Catskill Pond
http://catskillpond.com
scott@catskillpond.com
Returning Catskill Waters To A Simpler Time
EST. 1923