All storage tanks located in an aquifer recharge area must conform to the following requirements. The Washington Department of Ecology also regulates and authorizes permits for underground storage tanks (Chapter 173-360 WAC).
(1) Underground Tanks. All new underground storage facilities used or to be used for the underground storage of hazardous substances or hazardous wastes shall be designed and constructed so as to:
(a) Prevent releases due to corrosion or structural failure for the operational life of the tank;
(b) Be protected against corrosion, constructed of noncorrosive material, steel clad with a noncorrosive material, or designed to include a secondary containment system to prevent the release or threatened release of any stored substances; and
(c) Use material in the construction or lining of the tank that is compatible with the substance to be stored.
(2) Aboveground Tanks.
(a) No new aboveground storage facility or part thereof shall be fabricated, constructed, installed, used, or maintained in any manner which may allow the release of a hazardous substance to the soil, groundwater, or surface waters within an aquifer recharge area.
(b) No new aboveground tank or part thereof shall be fabricated, constructed, installed, used, or maintained without having constructed around or under it an impervious containment area enclosing or underlying the tank or part thereof.
(c) New aboveground tanks will require a secondary containment system, either built into the tank structure or a dike system built outside the tank, for all tanks located within an aquifer recharge area. [Ord. 4525 § 1, 2021; Ord. 3911 § 2, 2009; Code 1970 § 28.24.080.]