To ensure that any Existing or Future handling and storage of road salt potentially exposed to precipitation or runoff, in quantities greater than 100 kilograms in a WHPA-A inside a Sodium WHPA-ICA or Chloride WHPA-ICA ceases to be, or never becomes, a significant drinking water threat, where this activity is, or 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.