WAC 173-360-305   Performance standards for new UST systems.  In order to prevent releases due to structural failure, corrosion, or spills and overfills for as long as the UST system is used to store regulated substances, all owners and operators of new UST systems shall meet the following requirements:

     (1) Tanks. Each tank shall be properly designed and constructed with material that is compatible with and impermeable to the stored substance, and any portion underground that routinely contains regulated substances shall be protected from corrosion, in accordance with a code of practice developed by a nationally recognized association or independent testing laboratory as specified under (a) through (d) below:

     (a) The tank is constructed of fiberglass-reinforced plastic; or

Note:

The following industry codes may be used to comply with subsection (1)(a) of this section: Underwriters Laboratories Standard 1316, "Standard for Glass-Fiber-Reinforced Plastic Underground Storage Tanks for Petroleum Products"; Underwriter's Laboratories of Canada CAN4-S615-M83, "Standard for Reinforced Plastic Underground Tanks for Petroleum Products"; or American Society of Testing and Materials Standard D4021-86, "Standard Specification for Glass-Fiber-Reinforced Polyester Underground Petroleum Storage Tanks."

     (b) The tank is constructed of steel and cathodically protected in the following manner:

     (i) The tank is coated with a suitable dielectric material;

     (ii) The tank is equipped with a factory-installed or field-installed cathodic protection system designed by a corrosion expert;

     (iii) Cathodic protection systems are designed and installed to include provisions for testing to allow a determination of current operating status as required in WAC 173-360-320(2) and to facilitate testing by the department or delegated agency in accordance with WAC 173-360-325 (5) and (6); and

     (iv) Cathodic protection systems are operated and maintained in accordance with WAC 173-360-320 or according to guidelines established by the department or delegated agency; or

Note:

The following codes and standards may be used to comply with subsection (1)(b) of this section:

     (A) Steel Tank Institute "Specification for STI-P3 System of External Corrosion Protection of Underground Steel Storage Tanks";

     (B) Underwriters Laboratories Standard 1746, "Corrosion Protection Systems for Underground Storage Tanks";

     (C) Underwriters Laboratories of Canada CAN4-S603-M85, "Standard for Steel Underground Tanks for Flammable and Combustible Liquids," and CAN4-G03.1-M85, "Standard for Galvanic Corrosion Protection Systems for Underground Tanks for Flammable and Combustible Liquids," and CAN4-S631-M84, "Isolating Bushings for Steel Underground Tanks Protected with Coatings and Galvanic Systems"; or

     (D) National Association of Corrosion Engineers Standard RP-02-85, "Control of External Corrosion on Metallic Buried, Partially Buried, or Submerged Liquid Storage Systems," and Underwriters Laboratories Standard 58, "Standard for Steel Underground Tanks for Flammable and Combustible Liquids."

     (c) The tank is constructed of a steel-fiberglass-reinforced-plastic composite; or

Note:

The following industry codes may be used to comply with subsection (1)(c) of this section: Underwriters Laboratories Standard 1746, "Corrosion Protection Systems for Underground Storage Tanks," or the Association for Composite Tanks ACT-100, "Specification for the Fabrication of FRP Clad Underground Storage Tanks."

     (d) The tank construction and corrosion protection are determined by the department or delegated agency to be designed to prevent the release or threatened release of any stored regulated substance in a manner that is no less protective of human health and the environment than subsection (1)(a) through (c) of this section.

     (2) Piping. The piping that routinely contains regulated substances and is in contact with the ground shall be properly designed and constructed with material that is compatible with and impermeable to the stored substance, and protected from corrosion in accordance with a code of practice developed by a nationally recognized association or independent testing laboratory as specified below:

     (a) The piping is constructed of fiberglass-reinforced plastic; or

Note:

The following codes and standards may be used to comply with subsection (2)(a) of this section:

     (i) Underwriters Laboratories Subject 971, "UL Listed Non-Metal Pipe";

     (ii) Underwriters Laboratories Standard 567, "Pipe Connectors for Flammable and Combustible and LP Gas";

     (iii) Underwriters Laboratories of Canada Guide ULC-107, "Glass Fiber Reinforced Plastic Pipe and Fittings for Flammable Liquids"; and

     (iv) Underwriters Laboratories of Canada Standard CAN 4-S633-M81, "Flexible Underground Hose Connectors."

     (b) The piping is constructed of steel and cathodically protected in the following manner:

     (i) The piping is coated with a suitable dielectric material;

     (ii) Field-installed cathodic protection systems are designed by a corrosion expert;

     (iii) Cathodic protection systems are designed and installed to include provisions for testing to allow a determination of current operating status as required in WAC 173-360-320(2) and to facilitate testing by the department or delegated agency in accordance with WAC 173-360-325 (5) and (6); and

     (iv) Cathodic protection systems are operated and maintained in accordance with WAC 173-360-320 or guidelines established by the department or delegated agency; or

Note:

The following codes and standards may be used to comply with subsection (2)(b) of this section:

     (A) National Fire Protection Association Standard 30, "Flammable and Combustible Liquids Code";

     (B) American Petroleum Institute Publication 1615, "Installation of Underground Petroleum Storage Systems";

     (C) American Petroleum Institute Publication 1632, "Cathodic Protection of Underground Petroleum Storage Tanks and Piping Systems"; and

     (D) National Association of Corrosion Engineers Standard RP-01-69, "Control of External Corrosion on Submerged Metallic Piping Systems."

     (c) The piping construction and corrosion protection are determined by the department or delegated agency to be designed to prevent the release or threatened release of any stored regulated substance in a manner that is no less protective of human health and the environment than the requirements in subsection (2)(a) and (b) of this section.

     (d) Metal flexible underground hose connectors shall be cathodically protected or covered with sleeves or jackets that will provide corrosion protection over the operating life of the UST system.

     (3) Spill and overfill prevention equipment.

     (a) Except as provided in subsection (3)(b) of this section, to prevent spilling and overfilling associated with transfer of regulated substances to the UST system, owners and operators shall use the following spill and overfill prevention equipment:

     (i) Spill prevention equipment that will prevent release of regulated substances to the environment when the transfer hose is detached from the fill pipe (for example, a spill catchment basin); and

     (ii) Overfill prevention equipment that will:

     (A) Automatically shut off flow into the tank when the tank is no more than ninety-five percent full;

     (B) Alert the transfer operator when the tank is no more than ninety percent full by restricting the flow into the tank or triggering a high-level alarm; or

     (C) Restrict flow thirty minutes prior to overfilling, alert the operator with a high level alarm one minute before overfilling, or automatically shut off flow into the tank so that none of the fittings located on top of the tank are exposed to regulated substances due to overfilling.

Note:

Overflow prevention equipment that will automatically shut off or restrict flow into the tank should not be used where a pressurized fuel transfer system may be employed since an overflow may occur when the flow is suddenly shut off or restricted.

     (b) Owners and operators are not required to use the spill and overfill prevention equipment specified in subsection (3)(a) of this section if:

     (i) Alternative equipment is used that is determined by the department or delegated agency to be no less protective of human health and the environment than the equipment specified in subsection (3)(a)(i) or (ii) of this section; or

     (ii) The UST system is filled by transfers of no more than twenty-five gallons at one time.

     (4) Installation. All tanks and piping shall be properly installed by an UST supervisor who is certified in tank system installation in accordance with a code of practice developed by a nationally recognized association or independent testing laboratory and in accordance with the manufacturer's instructions.

Note:

Tank and piping system installation practices and procedures described in the following codes may be used to comply with the requirements of subsection (4) of this section:

     (a) American Petroleum Institute Publication 1615, "Installation of Underground Petroleum Storage System"; or

     (b) Petroleum Equipment Institute Publication RP100, "Recommended Practices for Installation of Underground Liquid Storage Systems"; or

     (c) American National Standards Institute Standard B31.3, "Petroleum Refinery Piping," and American National Standards Institute Standard B31.4 "Liquid Petroleum Transportation Piping System."

     (5) Certification of installation. All owners and operators shall ensure compliance with subsection (4) of this section by submitting a properly completed notification form to the delegated agency, or, if no delegated agency exists, to the department. The form must be signed by a certified UST supervisor.



[Statutory Authority: Chapter 90.76 RCW. 95-04-102, § 173-360-305, filed 2/1/95, effective 3/4/95; 91-22-020 (Order 91-26), § 173-360-305, filed 10/29/91, effective 11/29/91; 90-24-017, § 173-360-305, filed 11/28/90, effective 12/29/90.]