I agree about giving Michael Grey a shout. I would want the whole pond basin compacted with a sheepsfoot roller too..... From bottom to past high water mark. Dam would have a core trench, compacted and tied into good soil at the sides.

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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).