Wellfield Protection only applies to a particular land use or activity, whether that land use or activity is classified as a residential or commercial use, when: 

• the aggregate sum of all quantities of any one regulated substance on a given parcel or in a certain building exceeds 110 gallons if the substance is a liquid, or 1,110 pounds if the substance is a solid;
  
• or no single substance exceeds the limits referenced in subsection (a)(1) of this section but the aggregate sum of all regulated substances present on a given parcel or in a given building exceeds 110 gallons if the substances are liquids, or 1,110 pounds if the substances are solids.

Where regulated substances are dissolved in or mixed with non-regulated substances, only the actual quantity of the regulated substance present will be used to determine compliance.

Where a regulated substance is a liquid, the total volume of the regulated substance present in a solution or mixture of the substance with other substances will be determined by volume percent composition of the regulated substances.

This article applies to sanitary hazards. Four types of protection zones have been established using scientific criteria relating to the physical characteristics of the water supply aquifer and the transport gradients caused by either natural forces or induced pumpage of the wellfield(s).

The transport times associated with the protection zones are designed so as to allow adequate time to carry out mitigating procedures to prevent wellfield contamination in the event of spillage of any regulated substance.

Protection zone 1 consists of all land situated between the well and the water table aquifer six-month travel time zone demarcation.

Protection zone 2 consists of all land situated between the well and the planar geometric union of the largest of the following three travel time zones: Water table aquifer one-year travel time zone demarcation. Lower Tamiami one-year travel time zone demarcation. Sandstone one-year travel time zone demarcation.

Protection zone 3 consists of all land situated between the well and the planar geometric union of the largest of the following three protection zones: Water table one-year travel time zone demarcation and the water table aquifer five-year travel time zone demarcation. Sandstone aquifer one-year travel time zone demarcation and the Sandstone aquifer five-year travel time zone demarcation. Lower Tamiami one-year travel time zone demarcation and the Lower Tamiami five-year travel time zone demarcation.

Protection zone 4 consists of all land situated between the well and the planar geometric unit of the largest of the following three protection zones: Water table five-year travel time zone demarcation and the water table aquifer ten-year travel time zone demarcation. Sandstone five-year travel time zone demarcation and the Sandstone ten-year travel time zone demarcation. Lower Tamiami five-year travel time zone demarcation and the Lower Tamiami ten-year travel time zone demarcation.