"Rodger Whitlock" wrote in
message ...
It would help to have somewhat more information: Is that layer of
clay natural, or is it excavated soil that's been dumped on the
site?

What's under the clay?


--
Rodger Whitlock
Victoria, British Columbia, Canada

Rodger, Under the clay is gravel. The clay is natural, a neighbour tells me
that the surrounding area used to be famous for brick making.

Chris