Was an anti-seep collar installed around the pipe when the pond was constructed? As for the muddy water, does it settle out if a glass of water is taken from the pond and let sit for a day undisturbed?

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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).