And an engineering friend of mine said, "I hope they got it right!". I think it is the depth of the concrete bases that is key... and we cannot really see that at this point. I am hoping that it is at least 8 feet below ground; 4 feet above. Just guessing, but that would make the bases approx. 4'X8'X12' per base, of which there are many. An' dat's alotta CRETE!