Wisconsin Legislature: ATCP 93.515(9)

(d) Systems with a barrier in the excavation zone. Systems with a secondary barrier within the excavation zone shall meet all of the following requirements:

1. The testing method shall be capable of detecting a leak between the system and the secondary barrier.

2. The secondary barrier around the system shall consist of manufactured material which is impermeable to at least 10-6 cm/sec for the regulated substance stored, and which will direct a leak to the monitoring point, to be detected.

3. The liner shall be chemically compatible with the substance stored.

4. For cathodically protected tanks, the secondary barrier shall be installed so that it does not interfere with the proper operation of the cathodic protection system.

5. The test method shall be designed, installed, and maintained so groundwater, soil moisture, and rainfall do not render the method inoperative, so that a leak could go undetected.

6. The site shall be investigated to ensure that the secondary barrier is always above groundwater and not in a 25-year flood plain, unless the barrier and monitoring designs are for use under such conditions.

7. Monitoring wells shall be clearly marked and secured to avoid unauthorized access and tampering.

(e) Interstitial monitoring sensors. Interstitial monitoring sensors shall be capable of providing an audible or visual alarm in the event of a tank or line interstitial sensor actuation. Manual operator action shall be needed to silence the alarm.

(8) Methods of leak detection for piping.

(a) General. Leak detection for piping shall follow the requirements of s. ATCP 93.510 (4) and this section.

(b) Automatic line leak detectors.

1. Underground piping systems serving a storage tank with a submersible pump or pressurized booster pump shall be provided with an automatic line leak detector that alerts the operator to the presence of a leak by restricting or shutting off flow from the pump, when it detects leaks of 3 gallons per hour at 10 pounds per square inch line pressure within one hour.

2. New or replacement automatic electronic line leak detection shall be provided with a printer that provides at least all of the following information:

a. The date and time of the test.

b. The measured leak rate in gallons per hour and whether this leak rate indicates a pass or a fail.

c. The specific identification of the associated piping or sumps used for interstitial monitoring that are being tested.

3. Automatic electronic line leak detection shall be programmed to provide an audible and visual alarm in the event of a line test failure or if a periodic monthly line test is not performed within a 30-day interval. Manual operator action shall be needed to silence the alarm.

4. Any of the methods in sub. (7) may be used in lieu of complying with subd. 1. if they are designed and approved under s. ATCP 93.130 to detect a leak from any portion of the underground piping that routinely contains product.

1. In addition to the automatic line leak detection required by par. (b), a periodic precision tightness test of piping shall be performed in accordance with sub. (4), except as provided in subds. 2. and 3.

2. Where piping leak detection is installed that has the capability to perform monthly monitoring, a separate precision tightness test is not required.

3. Any of the methods in subs. (6) and (7) may be used in lieu of complying with subd. 1. if they are designed and approved under s. ATCP 93.130 to detect a leak from any portion of the underground piping that routinely contains product.

(d) Interstitial sensors. Sensors used for interstitial line monitoring shall be programmed to provide an audible or visual alarm. Manual operator action shall be needed to silence the alarm. The operator shall respond to the alarm within 30 minutes.

(e) Periodic line leak detection equipment testing.

1. A start-up functionality test of the operation of the leak detector shall be conducted in accordance with the manufacturer’s procedures for testing to the leak thresholds in par. (b) by inducing a physical line leak.

2. A functionality test of the operation of a mechanical line leak detector shall be conducted annually in accordance with the manufacturer’s procedures for testing to the leak thresholds in par. (b) by inducing a physical line leak.

3. A functionality test of the operation of an electronic line leak detector shall be conducted at least annually in accordance with the manufacturer’s procedures for periodic testing to the leak thresholds in par. (b) by inducing a physical line leak.

5. Annual functionality verification shall be recorded on the department’s electronic-mechanical line leak detector annual functionality form, TR-WM-123, and shall be maintained onsite in accordance with s. ATCP 93.500 (9) (a).

(9) Other methods. The department may approve other methods of leak detection in accordance with s. ATCP 93.130.

(10) Ullage testing. Tightness testing of the ullage portion shall be performed in one of the following ways:

(a) As specified in NFPA 30 section 21.5, by or under the direct supervision of a certified installer or tank system tightness tester.

(b) By or under the direct supervision of a certified tank system tightness tester, with leak detection equipment and methods as approved under s. ATCP 93.130 that measure the tightness of the ullage portion.

(11) Ordered conversion of leak detection methodology.

(a) The authorized agent or the department may order an operator, in writing, to terminate the use of a leak detection method and convert to an approved electronic methodology with history-generation capabilities for any of the following reasons:

1. The operator has a history of failing to perform monthly leak detection for a total of 6 months or more during a 24 month period, or for 3 consecutive months.

2. Statistical inventory reconciliation reports reflect pass for a total of 6 months or more during the preceding 24 months, or for 3 consecutive months, and the data points are not consistent with the material approval criteria in s. ATCP 93.130.

3. The operator fails to review monthly leak-detection reports as required by the applicable leak detection method under this section.

4. The operator enters data into an inventory record that is not supported by actual probe-generated data.

(b) The operator shall complete a conversion under par. (a) within 30 days of the date of the order or as determined by the department. Daily inventory verification as specified in s. ATCP 93.503 (2) is acceptable as a temporary monthly leak detection method during the conversion period.

Note: Failure to provide monthly leak detection in accordance with this subsection beyond the 30-day period or compliance date as determined by the department may result in immediate shutdown under s. ATCP 93.115 (3) (a) 2.

History: CR 17-092: cr. Register October 2019 No. 766, eff. 11-1-19; correction in (6) (L), (11) (a) 1., 2. made under s. 35.17, Stats., Register October 2019 No. 766.

ATCP 93.517 Airport hydrant system requirements.

(1) General.

(a) Airport hydrant system installations shall comply with release reporting, response and investigation, closure, financial responsibility and notification requirements in accordance with this section.

(b) New installations shall meet the plan review requirements in accordance with s. ATCP 93.100.

(2) Airport hydrant system plans and requirements.

(a) For new airport hydrant systems, leak detection plans shall be submitted to the department before the system becomes operational in accordance with s. ATCP 93.100.

(b) Fuel hydrant leak detection plans shall include all of the following:

1. A description of the airport hydrant system.

2. A description of the leak detection method used.

Note: A designer of an airport hydrant leak detection system who does not have a financial interest in the airport may be considered to be the independent third party that is required in s. ATCP 93.130 (3) (b) 1. for leak detection methods.

3. A schedule for testing the system.

4. Any limitations of the leak detection method.

5. An action plan in the event a leak is detected.

(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:

1. Perform a semiannual or annual tightness test at or above the piping operating pressure in accordance with the following system volume:

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.

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.

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.

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.

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:

a. First test, not later than October 13, 2018, airport hydrant systems may use up to a 6.0 gallon per hour leak rate.

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.

c. Third test, between October 13, 2021, and October 13, 2022, airport hydrant systems must use a 3.0 gallon per hour leak rate.

d. Subsequent tests, after October 13, 2022, begin using semiannual or annual line testing according to the maximum leak detection rate in par. (b).

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

4. Perform a line tightness test, conducted in accordance with s. ATCP 93.515 (4), at least every 2 years; or

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.

(3) Registration and notification.

(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.

(b) All owners of airport hydrant systems shall provide proof of financial responsibility in accordance with s. ATCP 93.700.

(4) System requirements.

(a) All new airport hydrant systems shall be designed and equipped with isolation valves appropriate for leak testing.

(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.

(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:

(a) Hydrant pits—visually check for any damage; remove any liquid or debris; and check for any leaks; and

(b) Hydrant piping vaults—check for any hydrant piping leaks.

History: 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 Corrosion protection.

(1) General.

(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:

1. The tank and piping are constructed of an inherently corrosion-resistant material.

a. The tank and piping are installed at a site that is determined by a certified corrosion expert to be non-corrosive during the operational life of the system.

b. A certified corrosion expert retained for the purpose of determining a non-corrosive site shall make at least one personal visit to each tank site during the design stage.

Note: See ATCP Table 93.200–5 for information on contacting NACE.

3. The tank is a listed composite or jacketed tank designated as complying with UL 1746, and the piping is protected by one of the methods in this subsection.