Cathedral Hill is the name of a new condominium tower under construction here in Ottawa. It requires an enormous deep excavation for its garage. The tricky part is that its all rock which requires both blasting and breaking to remove. Fine in an open area or quarry, but it is immediately adjacent the historic Christ Church Cathedral. I'd guess they are about 8m down now and wonder how they will build a haul ramp as they get down to the bottom.
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