020-1 Wyo. Code R. § 1-51 - Additions, Exceptions, and Alterations for UST Systems with Field-Constructed Tanks and Airport Hydrant Systems

(a) Exception to Piping Secondary Containment Requirement. Owners and/or operators may use single-wall piping when installing or replacing piping associated with UST systems with field-constructed tanks greater than 50,000 gallons and piping associated with airport hydrant systems. Piping associated with UST systems with field-constructed tanks less than or equal to 50,000 gallons not part of an airport hydrant system shall meet the secondary containment requirement when installed or replaced.

(b) Upgrade Requirements. Not later than October 13, 2018, airport hydrant systems and UST systems with field-constructed tanks where installation commenced on or before October 13, 2015, shall meet the following requirements or be permanently closed pursuant to Part G.

(i) Corrosion Protection. UST system components in contact with the ground that routinely contain regulated substances shall meet one of the following:

(A) Except as provided in paragraph (a) of this Section, the new UST system performance standards for tanks and piping found in Section 6; or

(B) Be constructed of metal and cathodically protected according to NACE International Standard Practice SP0285 as referenced in Section 2, or NACE International Standard Practice SP0169 as referenced in Section 2, or National Leak Prevention Association Standard 631 as referenced in Section 2, or ASTM Standard G158 as referenced in Section 2; and shall meet the following:

(I) Cathodic protection shall meet the requirements found in Section 6 for tanks and piping.

(II) Tanks over 10 years old without cathodic protection shall be assessed to ensure the tank is structurally sound and free of corrosion holes prior to adding cathodic protection. The assessment shall be by internal inspection or another method determined by the department to adequately assess the tank for structural soundness and corrosion holes.

(ii) Spill and Overfill Prevention Equipment. To prevent spilling and overfilling associated with product transfer to the UST system, all UST systems with field-constructed tanks and airport hydrant systems shall comply with new UST system spill and overfill prevention equipment requirements specified in Section 6.

(c) Walkthrough Inspections. In addition to the walkthrough inspection requirements in Section 13(d), owners and/or operators shall inspect the following additional areas for airport hydrant systems at least once every 30 days if confined space entry according to the Occupational Safety and Health Administration (29 CFR Part 1910) is not required or at least annually if confined space entry is required. Walkthrough inspection records shall be maintained in accordance with Section 13(f).

(i) Hydrant pits. Visually check for any damage, remove any liquid or debris, and check for any leaks; and

(ii) Hydrant piping vaults. Check for any hydrant piping leaks.

(d) Release Detection. Owners and/or operators of UST systems with field-constructed tanks and airport hydrant systems shall begin meeting the release detection requirements described in this subpart not later than October 13, 2018.

(i) Methods of Release Detection for Field-Constructed Tanks. Owners and/or operators of field-constructed tanks with a capacity less than or equal to 50,000 gallons shall meet the release detection requirements in Part D. Owners and/or operators of field-constructed tanks with a capacity greater than 50,000 gallons shall meet either the requirements in Part D (except Sections 16(d) or (e) shall be combined with inventory control) or use one or a combination of the following alternative methods of release detection:

(A) Conduct an annual tank tightness test that can detect a 0.5 gallon per hour leak rate;

(B) Use an automatic tank gauging system to perform release detection at least every 30 days that can detect a leak rate less than or equal to 1 gallon per hour. This method shall be combined with a tank tightness test that can detect a 0.2 gallon per hour leak rate performed at least every 3 years;

(C) Use an automatic tank gauging system to perform release detection at least every 30 days that can detect a leak rate less than or equal to 2 gallons per hour. This method shall be combined with a tank tightness test that can detect a 0.2 gallon per hour leak rate performed at least every 2 years;

(D) Perform vapor monitoring (conducted in accordance with Section 16(d) for a tracer compound placed in the tank system) capable of detecting a 0.1 gallon per hour leak rate at least every 2 years.

(E) Perform inventory control (conducted in accordance with Department of Defense Directive 4140.25, or A4A Airport Fuel Facilities Operations and Maintenance Guidance Manual (both as referenced in Section 2 ), or equivalent procedures) at least every 30 days that can detect a leak equal to or less than 0.5 percent of flow-through; and

(I) Perform a tank tightness test that can detect a 0.5 gallon per hour leak rate at least every 2 years; or

(II) Perform vapor monitoring or groundwater monitoring (conducted in accordance with Sections 16(d) or (e), for the stored regulated substance) at least every 30 days; or

(F) Another method approved by the department if the owner and/or operator can demonstrate that the method can detect a release as effectively as any of the methods allowed in this Section. In comparing methods, the department shall consider the size of release that the method can detect and the frequency and reliability of the detection.

(ii) Methods of Release Detection for Piping. Owners and/or operators of underground piping associated with field-constructed tanks less than or equal to 50,000 gallons shall meet the release detection requirements in Part D. Owners and/or operators of underground piping associated with airport hydrant systems and field-constructed tanks greater than 50,000 gallons shall follow either the requirements in Part D (except Sections 16(d) or (e) shall be combined with inventory control) or use one or a combination of the following alternative methods of release detection:

(A) Perform a semiannual or annual line tightness test at or above the piping operating pressure in accordance with the following table:

Maximum Leak Detection Rate Per Test Section Volume
Test Section Volume (Gallons)	Semiannual Test - Leak Detection Rate Not to Exceed (Gallons/Hour)	Annual Test - Leak Detection Rate Not to Exceed (Gallons/Hour)
<50,000	1.0	0.5
> 50,000 to <75,000	1.5	0.75
>75,000 to <100,000	2.0	1.0
>100,000	3.0	1.5

(B) Perform vapor mo

Piping segment volumes > 100,000 gallons not capable of meeting the maximum 3.0 gallon per hour leak rate for the semiannual test may be tested at a leak rate up to 6.0 gallons per hour according to the following schedule:

Phase-In For Piping Segments > 100,000 Gallons in Volume
First Test	Not later than October 13, 2018, may use up to 6.0 gallon/hour leak rate.
Second Test	Between October 13, 2018, and October 13, 2021, may use up to 6.0 gallon/hour leak rate.
Third Test	Between October 13, 2021, and October 13, 2022, shall use 3.0 gallon/hour leak rate.
Subsequent Tests	After October 13, 2022, begin using semiannual or annual line testing according to the Maximum Leak Detection Rate Per Test Section Volume in Table above.

nitoring (conducted in accordance with Section 16(d) for a tracer compound placed in the tank system) capable of detecting a 0.1 gallon per hour leak rate at least every 2 years.

(C) Perform inventory control (conducted in accordance with Department of Defense Directive 4140.25, or A4A Airport Fuel Facilities Operations and Maintenance Guidance Manual (both as referenced in Section 2 ), or an equivalent procedure) at least every 30 days that can detect a leak equal to or less than 0.5 percent of flow-through; and

(I) Perform a line tightness test (conducted in accordance with this Section using the leak rates for the semiannual test) at least every 2 years; or

(II) Perform vapor monitoring or groundwater monitoring conducted in accordance with Sections 16(d) or (e) for the stored regulated substance at least every 30 days; or

(D) Another method approved by the department if the owner and/or operator can demonstrate that the method can detect a release as effectively as any of the methods allowed in this Section. In comparing methods, the department shall consider the size of release that the method can detect and the frequency and reliability of detection.

(iii) Records for Release Detection. Owners and/or operators shall maintain release detection records according to the recordkeeping requirements in Section 18.

(e) Applicability of Closure Requirements to Previously Closed UST Systems. When directed by the department, the owner and/or operator of an UST system with field-constructed tanks or airport hydrant systems permanently closed before October 13, 2015, shall assess the excavation zone. The UST system shall be closed in accordance with Part G if releases from the UST may, in the judgment of the department, pose a current or potential threat to human health and the environment.

Notes

020-1 Wyo. Code R. § 1-51

Adopted, Eff. 6/29/2018.