ATCP 93.517(2)(c)(c) Owners and operators of underground piping systems associated with airport hydrant systems shall meet leak detection requirements in accordance with s. ATCP 93.510, or use one or a combination of the following alternative methods of release detection: ATCP 93.517(2)(c)1.1. Perform a semiannual or annual tightness test at or above the piping operating pressure in accordance with the following system volume: ATCP 93.517(2)(c)1.a.a. Fuel systems with less than 50,000 gallons are not to exceed one gallon per hour for semiannual testing or 0.5 gallons for annual testing. ATCP 93.517(2)(c)1.b.b. Fuel systems with 50,000 to 75,000 gallons are not to exceed 1.5 gallons per hour for semiannual testing or 0.75 gallons for annual testing. ATCP 93.517(2)(c)1.c.c. Fuel systems with 75,000 to 100,000 gallons are not to exceed 2.0 gallons per hour for semiannual testing or one gallon for annual testing. ATCP 93.517(2)(c)1.d.d. Fuel systems greater than 100,000 gallons are not to exceed 3.0 gallons per hour for semiannual testing or 1.5 for annual testing. ATCP 93.517(2)(c)2.2. Piping segments 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: ATCP 93.517(2)(c)2.a.a. First test, not later than October 13, 2018, airport hydrant systems may use up to a 6.0 gallon per hour leak rate. ATCP 93.517(2)(c)2.b.b. Second test, between October 13, 2018, and October 13, 2021, airport hydrant systems may use up to a 6.0 gallon per hour leak rate. ATCP 93.517(2)(c)2.c.c. Third test, between October 13, 2021, and October 13, 2022, airport hydrant systems must use a 3.0 gallon per hour leak rate. ATCP 93.517(2)(c)2.d.d. Subsequent tests, after October 13, 2022, begin using semiannual or annual line testing according to the maximum leak detection rate in par. (b). ATCP 93.517(2)(c)3.3. Perform inventory control in accordance with s. ATCP 93.515 (2) at least every 30 days that can detect a leak equal to or less than 0.5 percent of flow through; and ATCP 93.517(2)(c)5.5. Another method approved by the implementing agency if the owner and 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 implementing agency shall consider the size of release that the method can detect and the frequency and reliability of detection. ATCP 93.517(3)(a)(a) The owner of a newly installed airport hydrant system shall notify the implementing agency and register the system in accordance with s. ATCP 93.140. ATCP 93.517(3)(b)(b) All owners of airport hydrant systems shall provide proof of financial responsibility in accordance with s. ATCP 93.700. ATCP 93.517(4)(a)(a) All new airport hydrant systems shall be designed and equipped with isolation valves appropriate for leak testing. ATCP 93.517(4)(b)(b) Any repair or upgrade to an existing airport hydrant system shall include the installation of isolation valves in the section that is repaired or upgraded. ATCP 93.517(5)(5) Periodic inspections and walkthroughs. Owners and operators must 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 is not required, or at least annually if confined space entry is required: ATCP 93.517(5)(a)(a) Hydrant pits—visually check for any damage; remove any liquid or debris; and check for any leaks; and ATCP 93.517 HistoryHistory: CR 17-092: cr. Register October 2019 No. 766, eff. 11-1-19; correction in (2) (c) 2. b., c., 4. made under s. 35.17, Stats., Register October 2019 No. 766. ATCP 93.520(1)(a)(a) Where required. Vent lines, vapor lines and any portion of a single or double-wall tank system, whether new or existing, that routinely contains product and is in contact with the ground or with water shall be protected from corrosion by one of the following methods: ATCP 93.520(1)(a)1.1. The tank and piping are constructed of an inherently corrosion-resistant material.