Thanks Chris! Yea, I have to again give my thanks to you THF guys for pointing me in the right direction on about any of my questions!

Does anybody know how I can determine if this rock shelf is actually the location of the leak? The rock shelf begins about 10' from the surface but I am not sure how deep it goes. The pond will continue to lose water till it is really pretty low but I don't see any voids in the side slopes in this area when it is low.