I passed a park yesterday and saw they were excavating for a new tot lot. Brought my ATP today to see what we could see. In most areas they were down 6 to 8 inches but next to the concrete floor of a pavilion they dug down a foot deep. Now I was in excavation my whole life and I know a foot deep when I see it. The GW and a Rosie were still another 4 inches in the ground next to the concrete ! Just surprised coins can sink so deep !