In this chapter: A term in §B of this regulation has the meaning indicated; and A term not defined in §B of this regulation has: The meaning given to the term in a relevant statute or in COMAR 26.10.01 or 26.10.02; or If not defined in a relevant statute or COMAR 26.10.01 or 26.10.02, the meaning attributed by common use. Terms Defined. “Existing gasoline UST system” means a UST system located in a HRGUA or WHPA: Installed before: January 26, 2005, if located in a HRGUA; or January 1, 2010, if located in a WHPA; Containing gasoline, including gasohol, that is used to fuel motor vehicles; and That has a storage capacity greater than 2,000 gallons. “High risk groundwater use area” or “HRGUA” means an area with a new or existing gasoline UST system: In which an individual water supply system, as defined in COMAR 26.04.03.01-1B, serves as the water supply for the new or existing gasoline UST system facility, an adjoining property of the new or existing gasoline UST system facility, or both; and Located in: Baltimore, Carroll, Cecil, Frederick, or Harford County; and Anne Arundel, Baltimore, Carroll, Cecil, Frederick, or Harford County for the purpose of notifying a property owner of groundwater contamination in accordance with Environment Article, §4-411.2, Annotated Code of Maryland. “High risk underground oil storage facility” means an oil storage facility that meets the conditions defined in Regulation .07A of this chapter. “Levels of concern” means: Benzene at (=) 5 parts per billion; Toluene at (=) 1,000 parts per billion; Ethylbenzene at (=) 700 parts per billion; Total xylenes at (=) 10,000 parts per billion; and Methyl tertiary butyl ether (MTBE) at (=) 20 parts per billion. “Local government” means a county, municipal corporation, or sanitary district. “New gasoline UST system” means a UST system, including a replacement UST system, located in a HRGUA or WHPA: Installed on or after: January 26, 2005, if located in a HRGUA; or January 1, 2010, if located in a WHPA; and Containing gasoline, including gasohol, that is used to fuel motor vehicles. “Well” means a hole made in the ground to obtain or monitor groundwater. “Well head protection area” or “WHPA” means an area in Baltimore, Carroll, Cecil, Frederick, or Harford County identified and regulated by a local government surrounding one or more wells serving a: Community water system, as defined by COMAR 26.04.01.01B; or Public water system, as defined by COMAR 26.04.01.01B.