The General Electric plant in Holyoke was at the southwestern end of the second level canal. General Electric plants on the Hudson River and the Housatonic River polluted those rivers from the 1930 to the 1970s. The pollutant was PCBs or polychlorinated biphenyls. It is not known if this site is polluted or not so it is a brownfield.
Production at the plant was by site within the plant so there was no segregation of duties by floors.
Sanborn map analysis:
for Sanborn 1915 map look under Farr Alpaca