When they place the clay, make sure they tie in the core of the dam to good clay soil at the ends of the dam or the water might leak thru the soil around the ends of the dam.

It sounds like it's going to be a very nice pond!

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).