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23 May 2001 at 2:53 pm
#299726
Participant
CREDFERN
The diaginal is 3.9 ft. A 4 ft ID concrete ring and a steel lid with a good epoxy coating at grade could work. The lid would need to be thick enough to carry the anticipated load. The lid would need to be fastened so it could not be removed easily. A 4 ft lid 3/8 ” thick would be heavy. good luck.