Washington Administrative Code

(1) Authority. If the department determines the owners and operators of an UST system are violating any requirement of this chapter or chapter 90.76 RCW, the department may prohibit the delivery, deposit, or acceptance of regulated substances to the system or the entire UST facil…

(1) A person who fails to notify the department pursuant to the notification requirements of this chapter, or who submits false information, is subject to a civil penalty not to exceed five thousand dollars per violation.(2) A person who violates this chapter or chapter 90.76 RCW…

Owners and operators must ensure UST systems and UST system components are installed in accordance with the requirements of this section.(1) Notice of intent to install an UST system or a tank or piping run. When installing an entire UST system, or a tank or piping run that is pa…

Except as provided under WAC 173-360A-0330, owners and operators must ensure new UST systems and UST system components meet the performance standards of this section.(1) Tanks. To prevent releases due to structural failure or corrosion, tanks must meet the performance standards i…

By December 22, 1998, owners and operators of existing UST systems were required to meet the performance standards for new UST systems in WAC 173-360A-0310 or the upgrade requirements in this section. Existing UST systems not meeting this requirement must be permanently closed in…

By October 1, 2021, owners and operators must ensure previously deferred UST systems installed on or before October 1, 2018, meet the performance standards for new UST systems in WAC 173-360A-0310, meet the upgrade requirements in this section, or are permanently closed in accord…

Owners and operators must ensure partially exempt UST systems identified in WAC 173-360A-0110 (2)(a)(i) through (iii) meet the performance standards of this section. This section does not apply to aboveground storage tanks associated with previously deferred UST systems and any p…

(1) Performance standard for all UST systems. Owners and operators must ensure that all UST system components are made of or lined with materials that are compatible with the regulated substances stored in the UST system.(2) Demonstrations for selected UST systems. Owners and ope…

Owners and operators must ensure delivery of regulated substances to UST systems and withdrawal of regulated substances from waste oil UST systems are authorized and do not result in spills or overfills.(1) Authority to deliver or deposit. Without the prior written authorization …

Product deliverers must ensure delivery of regulated substances to UST systems are authorized and do not result in spills or overfills. Waste oil collectors must ensure withdrawals of regulated substances from waste oil UST systems are authorized.(1) Authority to deliver or depos…

Owners and operators must notify the department of any changes in the regulated substances stored in an UST system and document compatibility in accordance with the requirements of this section.(1) When changing to a hazardous substance, a regulated substance containing greater t…

Owners and operators must comply with the walkthrough inspection requirements of this section to ensure UST systems are properly operated and maintained.(1) Inspections. Operation and maintenance walkthrough inspections must be performed in accordance with the following requireme…

Owners and operators of UST systems with corrosion protection must comply with the requirements of this section to ensure the equipment is operating properly and will prevent releases to the environment due to corrosion until the UST system is permanently closed or undergoes a ch…

Owners and operators of UST systems with internal linings used to meet the upgrade requirements in WAC 173-360A-0320 (2)(a)(i) must comply with the requirements of this section.(1) Inspections. Within ten years after lining and every five years thereafter, lined tanks must be int…

Owners and operators of UST systems with containment sumps used for interstitial monitoring of piping must comply with the requirements of this section and the walkthrough inspection requirements in WAC 173-360A-0420 to ensure the equipment is operating properly and will prevent …

Owners and operators of UST systems with spill prevention equipment must comply with the requirements of this section and the walkthrough inspection requirements in WAC 173-360A-0420 to ensure the equipment is operating properly and will prevent releases to the environment.(1) Pe…

Owners and operators of UST systems with overfill prevention equipment must comply with the requirements of this section to ensure the equipment is operating properly and will prevent releases to the environment.(1) Inspections. Overfill prevention equipment must be inspected to …

Owners and operators must operate and maintain release detection equipment in accordance with the requirements of this section and the walkthrough inspection requirements in WAC 173-360A-0420 to ensure the equipment is operating properly and will detect leaks from tanks and pipin…

Owners and operators must ensure that UST system components that do not meet applicable performance standards or upgrade requirements or that are not operating properly are repaired or replaced. Owners and operators must ensure that repairs are performed in accordance with the re…

(1) This part establishes a mandatory operator training program for three distinct classes of individuals who operate and maintain UST systems. The program is designed to prevent and mitigate releases from UST systems by ensuring that those individuals know how to properly operat…

UST system owners and operators must designate individuals as Class A, Class B, and Class C operators in accordance with the requirements of this section.(1) At least one Class A and one Class B operator must be designated for each UST system or group of systems at a UST facility…

UST system owners and operators must ensure that each Class A, Class B, and Class C operator is trained in accordance with the requirements in WAC 173-360A-0530 by the dates specified in this section.(1) Class A and Class B operators must be trained within sixty days of assuming …

UST system owners and operators must ensure that each Class A, Class B, and Class C operator is trained in accordance with the requirements of this section. Any individual designated for more than one operator class must successfully complete the training required for each operat…

UST system owners and operators must ensure that Class A and Class B operators are retrained, as applicable, in accordance with the requirements of this section.(1) Applicability. If the department determines the owners and operators of an UST system are not in compliance with th…

UST system owners and operators must ensure that operation and maintenance plans are developed and maintained, as applicable, in accordance with the requirements of this section.(1) Applicability. If the department determines the owners and operators of an UST system are not in c…

(1) Presence of operators. While a UST facility is manned, UST system owners and operators must ensure at least one of the individuals manning the facility is a properly trained Class A, Class B, or Class C operator.(2) Signage. At each UST facility, UST system owners and operato…

UST system owners and operators must maintain records documenting all currently designated Class A, Class B, and Class C operators at a UST facility and the training received by those operators.(1) Designated operators. Records documenting Class A, Class B, and Class C operators …

Owners and operators must monitor tanks and underground piping for leaks in accordance with the requirements of this part. This section specifies general release detection requirements. WAC 173-360A-0610 and 173-360A-0615 identify allowed release detection methods for monitoring …

Owners and operators must monitor tanks for leaks using the methods, or combination of methods, of release detection specified in this section.(1) Tanks requiring secondary containment. Tanks requiring secondary containment under WAC 173-360A-0310 (4)(a) must be monitored for lea…

Owners and operators must monitor underground piping for leaks using the methods, or combination of methods, of release detection specified in this section.(1) Piping requiring secondary containment. Underground piping requiring secondary containment under WAC 173-360A-0310 (5)(a…

Owners and operators using inventory control (or another test of equivalent performance) must comply with the requirements of this section.(1) Standards.(a) Inventory control must be performed in a manner that is able to detect leaks of at least one percent of the monthly flow-th…

Owners and operators using weekly manual tank gauging must comply with the requirements of this section.(1) Standards.(a) Weekly manual tank gauging must be performed in a manner that is able to detect any leaks greater than the applicable test standards in Table 0625-1 with a pr…

Owners and operators using automatic tank gauging must comply with the requirements of this section.(1) Standards. For the purposes of this method, automatic tank gauge systems must be able to:(a) Detect at least a 0.2 gallon per hour leak rate from any portion of the tank that r…

Owners and operators using tank tightness tests must comply with the requirements of this section.(1) Standards. Tank tightness tests must be able to detect at least a 0.1 gallon per hour leak rate from any portion of the tank up to the ninety-five percent full level or up to the…

Owners and operators must equip pressurized piping with automatic line leak detectors meeting the requirements of this section.(1) Standards. For the purposes of this method, automatic line leak detectors must be able to:(a) Detect a leak rate of at least three gallons per hour a…

Owners and operators using monthly automatic electronic line leak detection must comply with the requirements of this section.(1) Standards. For the purposes of this method, automatic electronic line leak detectors must be able to detect a leak rate of at least 0.2 gallons per ho…

Owners and operators using line tightness tests must comply with the requirements of this section.(1) Standards. Line tightness tests must be able to detect at least a 0.1 gallon per hour leak rate at one and one-half times the operating pressure with a probability of detection o…

Owners and operators using interstitial monitoring must comply with the requirements of this section.(1) Standards. The interstitial monitoring system must be able to detect a leak through the inner wall of any portion of the tank or underground piping that routinely contains a r…

Owners and operators using vapor monitoring (testing or monitoring for vapors within the soil gas of the excavation zone) must comply with the requirements of this section. Except as otherwise provided in WAC 173-360A-0610(3) or 173-360A-0615(3), vapor monitoring may be either pa…

Owners and operators using groundwater monitoring (testing or monitoring for liquids on the groundwater) must comply with the requirements of this section. Except as otherwise provided in WAC 173-360A-0610(3) or 173-360A-0615(3), groundwater monitoring may be either passive (moni…

Owners and operators using statistical inventory reconciliation (SIR) must comply with the requirements of this section. SIR involves the application of statistical principles to inventory data similar to those described in WAC 173-360A-0620.(1) Standards. The SIR method must:(a)…

Owners and operators using other methods, or combinations of methods, of release detection must comply with the requirements of this section.(1) Standards. Other release detection methods must:(a) Be able to detect a 0.2 gallon per hour leak rate or a release of one hundred fifty…

Within twenty-four hours of identifying or being notified by another person of any of the following conditions, owners and operators of UST systems must report a suspected release to the department and initiate an investigation of the suspected release in accordance with WAC 173-…

When required by the department, owners and operators of an UST system must follow the procedures in WAC 173-360A-0720 to determine if the UST system is the source of off-facility impacts. These impacts include the discovery of regulated substances (such as the presence of free p…

Unless remedial action is initiated in accordance with WAC 173-360A-0750(4), owners and operators must immediately investigate and confirm all suspected releases of regulated substances requiring reporting under WAC 173-360A-0700 or investigation under WAC 173-360A-0710 using the…

Owners and operators must ensure site assessments, including site checks, are performed in accordance with the requirements of this section.(1) Applicability. Site assessments are required under this chapter to:(a) Investigate a suspected release from an UST system, as applicable…

Owners and operators must respond to spills and overfills of regulated substances in accordance with the requirements of this section.(1) If a spill or overfill of regulated substances from an UST system results in a release that may pose a threat to human health or the environme…

Owners and operators must immediately respond to all confirmed releases of regulated substances from UST systems that may pose a threat to human health or the environment, including those confirmed under WAC 173-360A-0720 through 173-360A-0740, in accordance with the requirements…

Owners and operators of temporarily closed UST systems must comply with the requirements of this section.(1) Taking UST systems out of operation. Within thirty days of temporarily closing an UST system:(a) The department must be notified using the applicable form provided by the …

Owners and operators must permanently close an UST system, or a tank or piping run that is part of an UST system, in accordance with the requirements of this section.(1) Notice of intent. Owners and operators must notify the department of their intent to permanently close an UST …