Sure - and it's generally sourced from the closest concrete foundry possible, unless there is something exceptional about the design of the units which make tha

Sure - and it's generally sourced from the closest concrete foundry possible, unless there is something exceptional about the design of the units which make that impossible. When I researched this in undergrad ~2006 90+ % of all concrete was sourced within 300 or 400 miles, iirc.