To ensure that any Future handling and storage of road salt potentially exposed to precipitation or runoff, in quantities greater than 100 kilograms, in a WHPA-A outside of a Sodium WHPA-ICA or Chloride WHPA-ICA, never becomes a significant drinking water threat, where this activity would be a significant drinking water threat, this activity shall be designated for the purpose of Section 57 of the Clean Water Act, 2006 and shall be prohibited.