teehjaeh57,

Much thanks for that well thought out plan. We are lucky enough to have some awesome blue clay that starts about 6' and seems to go on forever. We told the excavator guy to start digging from the existing pond bottom (14 or so feet down) and go till he couldn't reach any more and he never got out of the blue clay. We figured some 35-40 feet total. Never seen ground quite like it. Rolls up like a carpet in front of my dozer. Peels off instead of pushing. Weird stuff.