That is Will Sand and Gravel for many decades! My daughter's pre-school = the Blue Hill Montessori School is abbutting this property. There were never any instances of concern on health - hey why would there be contaminants in a gravel property? They were always good neighbors. There is a contaminated site in Canton (PCBs in remediation) but it is not WS&G!
Canton is a great place to live. If you are worried about the quarry simply research online or call town hall:http://town.canton.ma.us/ Trust me if their were or are any known health issues because of the quarry you should find plenty of data online.
No major health concerns. I have been actively chedking commercial properties for a client on Turnpike St. and the town requires all proper site inspections to be accomplished before new construction can be built on any land, including 21E which reviews whether a site has contamination or not. Please feel free to contact me with any other questions.