Go deep and see what you find. When I renovated my pond, I found a 1' thick vein of clay at 12', then it turned to solid clay at 22' depth. Unfortunately it wasn't enough for me to line the 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).