ATCP 93.510(4)(a)(a) Pressurized piping. Underground piping that conveys regulated substances under pressure shall comply with all of the following requirements unless all of the piping is visible:
ATCP 93.510(4)(a)1. 1. The system shall be equipped with an automatic line leak detector in accordance with s. ATCP 93.515 (8) (b).
ATCP 93.510(4)(a)2. 2. Single-wall piping systems shall have at least one of the following leak detection methods:
ATCP 93.510(4)(a)2.a. a. An annual precision tightness test.
ATCP 93.510(4)(a)2.b. b. Monthly monitoring to the 0.2 gallon per hour rate.
ATCP 93.510(4)(a)3. 3. Double-wall piping systems shall use one of the leak detection methods in subd. 2., or statistical inventory reconciliation, or continuous interstitial monitoring.
ATCP 93.510 Note Note: Under section s. ATCP 93.500 (1) (a), continuous electronic interstitial monitoring is generally required for all secondary containment installed on or after February 1, 2009.
ATCP 93.510(4)(a)4. 4. If a passing test using monthly monitoring is not achieved for 2 consecutive months, a precision tightness test shall be performed within 10 business days in accordance with s. ATCP 93.515 (4), and if the piping fails to pass that test, the site shall be assessed for the presence of a release in accordance with ss. ATCP 93.575 to 93.585.
ATCP 93.510(4)(b) (b) Suction piping.
ATCP 93.510(4)(b)1.1. Piping which conveys regulated substances under suction and which is not entirely visible shall use one of the following leak detection methods, except as provided in subd. 2.:
ATCP 93.510(4)(b)1.a. a. A precision tightness test conducted at least every 3 years.
ATCP 93.510(4)(b)1.b. b. Interstitial monitoring.
ATCP 93.510(4)(b)2. 2. Leak detection may be omitted for suction piping that meets all of the following requirements:
ATCP 93.510(4)(b)2.a. a. The below-grade piping operates at less than atmospheric pressure.
ATCP 93.510(4)(b)2.b. b. The below-grade piping is sloped so that the contents of the pipe will drain back into the storage tank if the suction is released.
ATCP 93.510(4)(b)2.c. c. Only 1 check valve is included in each suction line.
ATCP 93.510(4)(b)2.d. d. The check valve is visibly located directly below and as close as practical to the suction pump.
ATCP 93.510(4)(b)2.e. e. A method is provided that allows compliance with subd. 2. b. to d. to be readily observed or otherwise determined.
ATCP 93.510(4)(c) (c) Inventory control as leak detection. Piping connected to a tank using inventory control in accordance with sub. (3) (d) shall comply with one of the following:
ATCP 93.510(4)(c)1. 1. Pressurized piping shall have leak detection complying with par. (a).
ATCP 93.510(4)(c)2. 2. Suction piping shall have leak detection complying with par. (b).
ATCP 93.510 History History: CR 07-029: cr. Register November 2008 No. 635, eff. 2-1-09; CR 09-017: am. (2) (title) and (c) Register July 2009 No. 643, eff. 8-1-09; correction in (1) (a), (b), (c), (e), (2) (c), (3) (a) 1., 2., (b), (d) (intro.), 2., 3., (4) (a) 1., 4. made under s. 13.92 (4) (b) 7., Stats., Register December 2011 No. 672; corrections in (1) (a) to (c), (e), (2) (c), (3) (a) 1., 2., (b), (d) (intro.), 2., 3., (4) (a) 1., 4. made under s. 13.92 (4) (b) 7., Stats., Register October 2013 No. 694.
ATCP 93.515 ATCP 93.515Leak detection methods.
ATCP 93.515(1) (1)General.
ATCP 93.515(1)(a)(a) Leak detection methods for tank systems shall meet the requirements of this section.
ATCP 93.515(1)(b) (b) The leak detection test information reports submitted to the department, or maintained on site as required in s. ATCP 93.500 (9), shall include at least all of the following:
ATCP 93.515(1)(b)1. 1. Site information including the name of the business, the street address, and the municipality in which the site is located.
ATCP 93.515(1)(b)2. 2. Tank system information including the department-assigned tank identification number, the site identification number designated by the owner or operator, the tank capacity, the product in the tank, the type of pipe system, and whether there are pipe manifolds in the tank system.
ATCP 93.515(1)(b)3. 3. Test method information including the name of the method or equipment used, the material approval number as issued under s. ATCP 93.130, the date the test was performed, the threshold value used to declare a leak, the rate of volumetric change, whether the final result was a pass or fail, and the name and certification of the technician performing the test.
ATCP 93.515(2) (2)Inventory control.
ATCP 93.515(2)(a)(a) General methodology. Inventory control that is used as the leak detection method shall be conducted in accordance with API 1621 and with this subsection.
ATCP 93.515(2)(b) (b) Prescriptive requirements. Product inventory control shall be conducted monthly and reconciled to detect a leak rate of at least 0.5 percent of throughput on a monthly basis, in the following manner:
ATCP 93.515 Note Note: A leak rate of 0.5 percent is equal to 5 gallons out of every 1000 gallons of throughput.
ATCP 93.515(2)(b)1. 1. Inventory volume measurements for inputs, withdrawals, and the amount still remaining in the tank shall be recorded each operating day.
ATCP 93.515(2)(b)2. 2. The equipment used shall be capable of measuring the level of product over the full range of the tank's height, to the nearest one-eighth of an inch.
ATCP 93.515(2)(b)3.a.a. The inputs shall be reconciled with delivery receipts by measurement of the tank inventory volume before and after delivery.
ATCP 93.515(2)(b)3.b. b. Where tanks are interconnected by a manifold, reconciliation may address all of the interconnected tanks as a group rather than as individual tanks.
ATCP 93.515(2)(b)4. 4. The measurement of any water level in the bottom of the tank shall be electronically or manually gauged to the nearest one-eighth of an inch at least once a month and recorded.
ATCP 93.515(2)(c) (c) Product losses. Tank systems that exceed the losses allowed under par. (b) for 2 consecutive months shall follow the requirements in ss. ATCP 93.575 to 93.585 for assessing and responding to a release.
ATCP 93.515(2)(d) (d) Precision tightness test. A precision tightness test shall be performed within 10 business days of notification from the authorized agent or the department for any of the following reasons:
ATCP 93.515(2)(d)1. 1. Failure to provide monthly inventory control data for the past 12 months.
ATCP 93.515(2)(d)2. 2. Incomplete or inconsistent data entry reflected during any 2 months of data entry out of the most recent 3 months of inventory control record keeping.
ATCP 93.515(3) (3)Manual tank gauging.
ATCP 93.515(3)(a)(a) Where allowed.
ATCP 93.515(3)(a)1.1. Manual tank gauging may be used as the sole method of leak detection for tanks that have a capacity of 1,000 gallons or less, for the life of the tank.
ATCP 93.515(3)(a)2. 2. For tanks that have a capacity of more than 1000 gallons, to 2,000 gallons, manual tank gauging may be used if all of the following conditions are met:
ATCP 93.515(3)(a)2.a. a. The tank system has a precision tightness test performed in accordance with sub. (4) at least once every 5 years.
ATCP 93.515(3)(a)2.b. b. The tank is less than 10 years old.
ATCP 93.515(3)(a)2.c. c. The piping either receives an annual precision tightness test or has electronic line leak detection testing, and this tightness test or leak detection testing is performed in accordance with the capabilities specified in s. ATCP 93.130 (3) (b).
ATCP 93.515(3)(a)3. 3. Tanks which have a capacity of more than 1000 gallons, to 2,000 gallons and which are more than 10 years old shall be provided with monthly monitoring in accordance with sub. (5), (6) or (7).
ATCP 93.515(3)(a)4. 4. Tanks that have a capacity of more than 2,000 gallons may not use manual tank gauging as the method of required leak detection.
ATCP 93.515(3)(b) (b) Manual tank gauging procedures. Manual tank gauging shall meet all of the following requirements:
ATCP 93.515(3)(b)1. 1. Liquid level measurements shall be taken with a gauge stick that is marked to measure the liquid to the nearest one-eighth of an inch over the full range of the tank's height.
ATCP 93.515(3)(b)2. 2. Tank liquid level measurements shall be taken at the beginning and ending of the test duration periods given in Table 93.515, during which no liquid may be added to or removed from the tank, and shall be based on the average of 2 stick readings taken at both the beginning and ending of the period.
ATCP 93.515(3)(b)3. 3. A leak is suspected and subject to the requirements of ss. ATCP 93.575 to 93.585 if the variation between beginning and ending measurements exceeds the weekly or monthly standards in Table 93.515.
Table 93.515
Test Duration and Standards - See PDF for table PDF
1 Requires precision tightness testing every 5 years. This method is only allowed until the tank is 10 years old.
ATCP 93.515(4) (4)Precision tightness testing.
ATCP 93.515(4)(a)(a) Precision tightness testing shall be conducted in one of the following ways:
ATCP 93.515(4)(a)1. 1. By a certified tank system tightness tester, using methods approved under s. ATCP 93.130 to perform precision tightness testing for tanks or piping.
ATCP 93.515(4)(a)2. 2. With permanently installed leak detection equipment as approved under s. ATCP 93.130 to perform precision tightness testing for tanks or piping.
ATCP 93.515(4)(b) (b) Where a certified tank system tightness tester is used, the tester shall include the date and the beginning and end times in the test results report.
ATCP 93.515(5) (5)Automatic tank gauging. Automatic tank gauging shall meet all of the following requirements:
ATCP 93.515(5)(a)1.1. No more than 30 days may elapse between monthly monitoring tests using an automatic tank gauge.
ATCP 93.515(5)(a)2. 2. Monthly monitoring tests shall have the capabilities specified in s. ATCP 93.130 (3) (b).
ATCP 93.515(5)(a)3. 3. An automatic tank gauge shall be placed in the center of the tank and no closer than 24 inches from the fill pipe and the submersible pump, unless approved otherwise by the department.
ATCP 93.515(5)(b) (b) Automatic tank gauges shall be provided with a printer that provides at least all of the following information:
ATCP 93.515(5)(b)1. 1. The starting date and time and ending date and time of the test.
ATCP 93.515(5)(b)2. 2. The volume of liquid in the tank during the test.
ATCP 93.515(5)(b)3. 3. The measured leak rate in gallons per hour and whether this leak rate indicates a pass or a fail.
ATCP 93.515(5)(b)4. 4. The specific identification of the tank and any associated piping that is being tested.
ATCP 93.515(6) (6)Statistical inventory reconciliation.
ATCP 93.515(6)(a)(a) Operators using statistical inventory reconciliation (SIR) as the primary method of leak detection shall have in effect a process to submit their data to the vendor within 4 business days of the end of the monthly reporting period.
ATCP 93.515(6)(b) (b) The daily tank product inventory records shall be maintained current and be maintained on site.
ATCP 93.515(6)(c) (c) The SIR vendor shall analyze the data and supply a summary report to the operator on a monthly basis.
ATCP 93.515(6)(d) (d) The SIR vendor shall return the summary report to the submitter within 10 business days after the postmark on the submittal.
ATCP 93.515(6)(e) (e) Operators using statistical inventory reconciliation shall review the vendor summary report within 24 hours of receipt. If the summary report indicates a failure, the operator shall take immediate action in accordance with the requirements in ss. ATCP 93.575 to 93.585 for assessing and responding to a release.
ATCP 93.515(6)(f) (f) Operators who receive summary reports that indicate either a failure or inconclusive results, or 1 of each, for 2 out of any 3 consecutive months shall have a precision tightness test performed on the tank system within 7 calendar days of receipt of the report.
ATCP 93.515(6)(g) (g) Statistical inventory reconciliation may not be used as a method of precision tightness testing.
ATCP 93.515(6)(h) (h) Before changing from another method of leak detection to statistical inventory reconciliation, the operator shall provide the department with proof of a precision tightness test completed within the previous 12 months showing the tank system to be tight.
ATCP 93.515(7) (7)Interstitial monitoring. Interstitial monitoring between an underground tank system and a secondary barrier immediately around it may be used only if the system is installed and maintained to detect a leak from any portion of the tank that could contain product, and the system meets one of the following requirements:
ATCP 93.515(7)(a) (a) System testing. Post-installation testing shall be performed on the interstitial monitoring system to verify that the system operates in accordance with the manufacturer's specifications.
ATCP 93.515(7)(b) (b) Double-walled systems. For double-walled systems, the sampling or testing method shall be capable of detecting a leak through the inner wall in any portion of the tank that routinely contains product.
ATCP 93.515(7)(c) (c) Systems with internally fitted liners.
ATCP 93.515(7)(c)1.1. For tank systems with an internally fitted liner, a monitoring system shall be installed that is capable of detecting a leak between the inner wall of the tank and the liner.
ATCP 93.515(7)(c)2. 2. The liner shall be chemically compatible with the substance stored.
ATCP 93.515(7)(d) (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:
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Published under s. 35.93, Stats. Updated on the first day of each month. Entire code is always current. The Register date on each page is the date the chapter was last published.