Section 173-360-320. Operation and maintenance of corrosion protection.

All owners and operators of steel UST systems with corrosion protection shall comply with the following requirements to ensure that releases due to corrosion are prevented for as long as the UST system is used to store regulated substances:

(1) All corrosion protection systems shall be operated and maintained to continuously provide corrosion protection to the metal components of that portion of the tank and piping that routinely contain regulated substances and are in contact with the ground.

(2) All UST systems equipped with cathodic protection systems shall be inspected for proper operation by an UST supervisor who is certified in cathodic protection in accordance with the following requirements:

(a) Frequency. All cathodic protection systems shall be tested when they are installed, and again between one and six months after installation, and at least every three years thereafter or according to another reasonable time frame established by the department or delegated agency; and

(b) Inspection criteria. The criteria that are used to determine that cathodic protection is adequate as required by this section shall be in accordance with a code of practice developed by a nationally recognized association.

Note:	National Association of Corrosion Engineers Standard RP-02-85, "Control of External Corrosion on Metallic Buried, Partially Buried, or Submerged Liquid Storage Systems," may be used to comply with subsection (2)(b) of this section.

(3) UST systems with impressed current cathodic protection systems shall also be inspected every 60 days to ensure the equipment is running properly.

(4) For UST systems using cathodic protection, records of the operation of the cathodic protection shall be maintained to demonstrate compliance with the performance standards in this section. These records shall provide the following:

(a) The results of the last three inspections required in subsection (3) of this section; and

(b) The results of testing from the last two inspections required in subsection (2) of this section.

(5) Certified UST supervisors who perform any of the tank services described in this section shall certify that such services comply with the requirements of this section by signing the appropriate checklist(s) provided by the department.

[Statutory Authority: Chapter 90.76 RCW. WSR 95-04-102, § 173-360-320, filed 2/1/95, effective 3/4/95; WSR 90-24-017, § 173-360-320, filed 11/28/90, effective 12/29/90.]

Chapter 90.76 RCW. WSR 95-04-102, § 173-360-320, filed 2/1/95, effective 3/4/95; WSR 90-24-017, § 173-360-320, filed 11/28/90, effective 12/29/90.