Hi Sean,
I was sure that you'd be right on it, sharing that document which is a fantastic but hidden resource that was prepared by Toronto Public Health, back when there was great staff at the Toronto Food Strategy office who produced useful documents like this one (just a decade ago). FYI, that document built on extensive research on what was known in terms of soil safety for urban growing, resulting in a document of 300 pages or so. The document that you shared, Sean, was a publicly oriented document to help growers in figuring how to proceed, based on what that scientific document compiled. Unfortunately, the Toronto Food Strategy office was closed around Covid time, and the Toronto Food Policy Council disappeared around the same time.
Just some background to the document that you shared - and please continue to share it!
Joe Nasr