Ariz. Admin. Code § R18-12-220 - Performance Standards for New UST Systems

A. Owners and operators of a new UST system shall meet the requirements described in this Section 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. In addition, except for suction piping that meets the requirements of R18-12-241(C)(2)(a) through (e), tanks and piping installed or replaced after January 1, 2009 shall be secondarily contained and use interstitial monitoring in accordance with R18-12-243(G) . Secondary contain, be able to contain regulated substances leaked from the primary containment until they are detected and removed and pre-vent the release of regulated substances to the environment at any time during the operational life of the UST system. For cases where the piping to be replaced exceeds the percentage in A.R.S. § 49-1009(C), the entire piping run shall be secondarily contained.

B. A tank shall be properly designed and constructed, and any portion underground that routinely contains a regulated substance shall be protected from corrosion in accordance with a code of practice developed by a nationally recognized association or independent testing laboratory as specified below:

1. The tank is constructed of fiberglass-reinforced plastic. Compliance with this subsection may be determined in accordance with the performance standards set forth in R18-12-281(B);

2. The tank is constructed of steel and is cathodically protected, in accordance with one of the performance standards of R18-12-281(C), by all of the following:

a. The tank is coated with a suitable dielectric material;

b. The field-installed cathodic protection systems are designed by a corrosion expert;

c. The impressed current systems, if used, are designed to allow determination of current operating status as required in R18-12-231(C);

d. The cathodic protection systems are operated and maintained in accordance with R18-12-231.

3. The tank is constructed of steel and clad or jacketed with a non-corrodible material. Compliance with this subsection shall be determined in accordance with one of the performance standards set forth in R18-12-281(D).

4. The tank is constructed of metal without additional corrosion protection measures, and both of the following conditions are met:

a. The tank is installed at a site that is determined by a corrosion expert not to be corrosive enough to cause it to have a release due to corrosion during its operating life;

b. Owners and operators maintain records that demonstrate compliance with the requirements of subsection (B)(4)(a) for the remaining operational life of the tank.

5. The tank construction and corrosion protection are determined by the Department 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 of subsections (B)(1) through (4).

C. The piping that routinely contains regulated substances and is in contact with the ground shall be properly designed, constructed, and protected from corrosion in accordance with a code of practice developed by a nationally recognized association or independent testing laboratory as specified below:

1. The piping is constructed of non-corrodible material. Compliance with this subsection may be determined in accordance with the performance standard set forth in R18-12-281(E).

2. The piping is constructed of steel and in meeting the performance standards of R18-12-281(F) is cathodically protected according to all of the following:

a. The pipmg is coated with a suitable dielectric material;

b. Field-installed cathodic protection systems are designed by a corrosion expert;

c. Impressed current systems, if used, are designed to allow determination of current operating status as required in R18-12-231(C);

d. Cathodic protection systems are operated and maintained in accordance with R18-12-231.

3. The piping is constructed of metal without additional corrosion protection measures, and all of the following requirements are satisfied:

a. The piping is installed at a site that is determined by a corrosion expert to not be corrosive enough to cause it to have a release due to corrosion during its operating life;

b. The piping meets the performance standards of R18 12281(G);

c b. Owners and operators maintain records that demonstrate compliance with the requirements of subsection (a) for the remaining life of the piping.

4. The piping construction and corrosion protection are determined by the Department 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 subsections (C)(1) through (3).

D. Except as provided in subsections D)(3) and (D)(4), owners and operators shall use both of the following spill and overfill prevention equipment systems to prevent spilling and overfilling associated with transfer of a regulated substance to the UST system:

1. Spill prevention equipment that will prevent release of a regulated substance to the environment when the transfer hose is detached from the fill pipe;

2. Overfill prevention equipment that will do one or more of the following:

a. Automatically shut off flow into the tank when the tank is no more than 95% full;

b. Alert the transfer operator when the tank is no more than 90% full by restricting the flow into the tank or triggering a high-level alarm that can be heard at the point of transfer;

c. Restrict flow 30 minutes prior to overfilling, alert the operator with a high level alarm that can be heard at the point of transfer 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 a regulated substance due to overfilling.

3. Owners and operators are not required to use the spill and overfill prevention equipment specified in subsections (D)(1) and (2) if either of the following conditions is met:

a. Alternative equipment is used that is determined by the Department to be no less protective of human health and the environment than the equipment specified in subsections (D)(1) or (2);

b. The tank is filled by transfers of no more than 25 gallons at one time.

4. Flow restrictors used in vent lines may not be used to comply with subsection (D)(2) of this Section when overfill prevention is installed or replaced.

5. Spill and overfill prevention equipment shall be periodically tested or inspected in accordance with R18-12-235.

E. The UST system shall

1. be properly installed in accordance with the manufacturer's instructions

2. and in accordance with a code of practice developed by a nationally recognized association or independent testing laboratory, such as those listed in R18-12-281(G).

F. Owners and operators shall ensure, in addition to the installation being inspected and approved by the Department under R18-12-219, that one or more of the following methods of certification, testing, or inspection is used to demonstrate compliance with subsection (E):

1. The installer has been certified by the tank and piping manufacturers,

2. The installation has been inspected and certified by a registered professional engineer with education and experience in UST system installation, or

3. The installation has been inspected and approved by the Department,

4 3. All work listed in the manufacturer's installation checklists has been completed, or

4. Owners and operators have complied with another method for ensuring compliance with subsection (E) that is determined by the Department to be no less protective of human health and the environment.

G. Under-dispenser containment. Each UST system shall be equipped with under-dispenser containment for any new dispenser installed or replaced after January 1, 2009. Under-dispenser containment shall be liquid-tight on its sides, bottom, and at any penetrations. Under-dispenser containment shall allow for visual inspection and access to the components in the containment system or be periodically monitored for leaks from the dispenser system.

H. Notwithstanding subsection (G), under dispenser containment is only required when a new dispenser system is installed if the requirement for under dispenser containment in A.R.S. § 49-1009(D) is changed to apply only to new dispenser system installation. A dispenser system is considered new when both the dispenser and the equipment needed to connect the dispenser to the underground storage tank system are installed at an UST facility. The equipment necessary to connect the dispenser to the underground storage tank system includes check valves, shear valves, unburied risers or flexible connectors, or other transitional components that are underneath the dispenser and connect the dispenser to the underground piping.

G I. Owners shall provide a certification of compliance on the UST Notification Form in accordance with R18-12-222(D) and shall ensure that a certification statement in accordance with the applicable requirements of R18-12-222(E) is signed by the installer on the Notification Form prior to submission to the Department.

H. If an UST system is installed or modified to meet the requirements of this Section, owners shall notify the Department in accordance with R18-12222(F)(2) within 30 days of the date that the UST system is brought into operation or modified.

Notes

Ariz. Admin. Code § R18-12-220

Adopted effective July 30, 1996 (Supp. 96-3). Amended by final rulemaking at 25 A.A.R. 3123, effective 1/1/2020.