Section 18 AAC 78.705 - Additions, exceptions, and alternatives for airport hydrant systems and USTs with field-constructed tanks(a)Exception to piping secondary containment requirements. An owner or operator may use single-walled piping when installing or replacing piping associated with USTs with field-constructed tanks greater than 50,000 gallons and piping associated with airport hydrant systems. Piping associated with USTs with field-constructed tanks less than or equal to 50,000 gallons and that are not part of an airport hydrant system must meet the secondary containment requirements of 18 AAC 78.025(c) when installed or replaced.(b)Upgrade requirements. Not later than October 13, 2018, airport hydrant systems and USTs with field-constructed tanks where installation commenced on or before October 13, 2015 must meet the following requirements or be permanently closed under 18 AAC 78.085: (1) UST components in contact with the ground that routinely contain petroleum must meet one of the following corrosion protection requirements:(A) except as provided in (a) of this section, the components must meet the performance standards for new tanks under 18 AAC 78.025(e) and for new piping under ISAAC 78.025(f); or(B) the components must be constructed of metal and cathodically protected according to a nationally recognized code of practice and must meet the following requirements: (i) cathodic protection must meet the requirements of 18 AAC 78.025(e)(2)(B), (C), and (D) for tanks, and 18 AAC 78.025(f)(2)(B), (C), and (D) for piping; and(ii) tanks greater than 10 years old without cathodic protection must be assessed to ensure the tank is structurally sound and free of corrosion holes before adding cathodic protection; the assessment must be by internal inspection or another method determined by the department to adequately assess the tank for structural soundness and corrosion holes; (2) to prevent spilling and overfilling associated with product transfer to the UST, all airport hydrant systems and USTs with field-constructed tanks must comply with spill and overfill prevention equipment requirements specified in 18 AAC 78.025(g) for new USTs; and(3) to meet the requirements of this section, the owner or operator shall ensure that one of the following requirements are used:(A) NACE International Standard RP0285-2002, Standard Recommended Practice-Corrosion Control of Underground Storage Tank Systems by Cathodic Protection, 2002, adopted by reference;(B) NACE International Standard Practice SPO169-2007, Control of External Corrosion on Underground or Submerged Metallic Piping Systems, reaffirmed March 15, 2007, adopted by reference;(C) National Leak Prevention Association Standard 63 1, Chapter C, Entry, Cleaning, Interior Inspection, Repair and Lining of Underground Storage Tanks: Internal Inspection of Steel Tanks for Retrofit of Cathodic Protection, 1991, adopted by reference;(D) American Society for Testing and Materials Standard G158-98, Standard Guide for Three Methods of Assessing Buried Steel Tanks, 2016. adopted by reference; or(E) another procedure, code, or standard that is no less protective of human health and safety and the environment and approved by the department.(c)Walkthrough inspections. In addition to meeting the walkthrough inspection requirements in 18 AAC 78.058, the owner or operator shall inspect each of the following additional areas for airport hydrant systems at least once every 30 days if confined space entry for purposes of federal Occupational Safety and Health Administration requirements under 29 C.F.R. 1910.146 is not required, and at least annually if confined space entry is required, and shall keep documentation of the inspection in accordance with 18 AAC 78.058(b): (1) the owner or operator shall visually check hydrant pits for any damage, remove any liquid or debris, and check for any leaks; and(2) the owner or operator shall check hydrant piping vaults for any hydrant piping leaks.(d)Release detection. The owner or operator of an airport hydrant system or a UST with field-constructed tanks must begin meeting the following release detection requirements not later than October 13,2018: (1) an owner or operator of a field-constructed tank with a capacity less than or equal to 50,000 gallons must meet the release detection requirements in 18 AAC 78.060-18 AAC 78.072; an owner or operator of a field-constructed tank with a capacity greater than 50,000 gallons must meet either the requirements in 1 8 AAC 78.060 - 18 AAC 78.072, except that vapor monitoring or groundwater monitoring must be combined with inventory control as stated under (E) of this paragraph, or the owner or operator must use one or a combination of the following alternative methods of release detection: (A) the owner or operator must conduct an annual tank tightness test that can detect a 0.5 gallon per hour leak rate;(B) the owner or operator must 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 one gallon per hour; this method must be combined with a tank tightness test that can detect a 0.2 gallon per hour leak rate performed at least every three years;(C) the owner or operator must 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 two gallons per hour; this method must be combined with a tank tightness test that can detect a 0.2 gallon per hour leak rate performed at least every two years;(D) the owner or operator must perform vapor monitoring, in accordance with 18 AAC 78.065(f) for a tracer compound placed in the tank system, capable of detecting a 0.1 gallon per hour leak rate at least every two years;(E) the owner or operator must perform inventory control in accordance with 18 AAC 78.065(b)( 1) - (8), at least every 30 days that can detect a leak equal to or less than 0.5 percent of flow-through; and(F) the owner or operator may use another method approved by the department if the owner or operator can demonstrate that the method can detect a release as effectively as any of the methods allowed in (A) - (E) of this paragraph; in comparing methods, the department will consider the size of release that the method can detect and the frequency and reliability of detection;(2) an owner or operator of underground piping associated with a field-constructed tank less than or equal to 50,000 gallons must meet the release detection requirements in 18 AAC 78.060 - 18 AAC 78.072; an owner or operator of underground piping associated with an airport hydrant system and a field-constructed tank greater than 50,000 gallons must follow either the requirements in 18 AAC 78.060 - 1 8 AAC 78.072, except that vapor monitoring or groundwater monitoring must be combined with inventory control as stated under (C) of this paragraph, or the owner or operator must use one or a combination of the following alternative methods of release detection: (A) the owner or operator must perform a semiannual or annual line tightness test at or above the piping operating pressure in accordance with Table D of this subparagraph; however, piping segment with volumes greater than or equal to 100,000 gallons not capable of meeting the maximum 3.0 gallon per hour leak rate for the semiannual test may be tested according to the phase-in schedule in Table E of this subparagraph: TABLE D. MAXIMUM LEAK DETECTION RATE PER TEST SECTION VOLUME
Test section volume (gallons) | Semiannual test-leak detection rate not to exceed (gallons per hour) | Annual test-leak detection rate not to exceed (gallons per 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 |
TABLE E. PHASE-IN FOR PIPING SEGMENTS >=100,000 GALLONS IN VOLUME
First test | Not later than October 13, 2018, with a leak detection rate not to exceed 6.0 gallons per hour |
Second test | After October 13, 2018 and not later than October 13, 2021, with a leak detection rate not to exceed 6.0 gallons per hour |
Third test | After October 13, 2021 and not later than October 13, 2022, with a leak detection rate not to exceed 3.0 gallons per hour |
Subsequent tests | After October 13, 2022, begin using semiannual or annual line testing according to Table D of this subparagraph (maximum leak detection rate per test section volume) |
(B) the owner or operator must perform vapor monitoring in accordance with 18 AAC 78.065(f) for a tracer compound placed in the tank system, capable of detecting a 0.1 gallon per hour leak rate at least every two years;(C) the owner or operator must perform inventory control in accordance with 18 AAC 78.065(b)(1) - (8), 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, in accordance with (A) of this paragraph using the leak rates for the semiannual test, at least every two years; or(ii) perform vapor monitoring or groundwater monitoring, in accordance with 18 AAC 78.065(0 or (g), respectively, for the stored petroleum, at least every 30 days; or(D) the owner or operator may use another method approved by the department if the owner or operator can demonstrate that the method can detect a release as effectively as any of the methods allowed in (A) - (C) of this paragraph; in comparing methods, the department will consider the size of release that the method can detect and the frequency and reliability of detection; and(3) the owner or operator shall maintain release detection records in accordance with the recordkeeping requirements in 18 AAC 78.072.(e) Applicability of closure requirements to previously closed USTs. When directed by the department, the owner or operator of an airport hydrant system or a UST with field-constructed tanks that was permanently closed before October 13, 2015 must assess the excavation zone and close the UST in accordance with 18 AAC 78.085 if releases from the UST may, in the determination of the department, pose a current or potential threat to human health and the environment.Eff. 9/27/2018,Register 227, October 2018The publication adopted by reference in 18 AAC 78.700(d) may be reviewed at the department 's office in Anchorage or may be obtained directly from the Who le Building Design Guide website: http://dod.wbdg.org/.Authority:AS 46.03.020
AS 46.03.365