To permanently close an underground tank system, the owner or operator shall have the tank and piping emptied and cleaned, by removing all liquids and accumulated sludge, and shall remove the tank and piping from the site unless allowed otherwise under par. (e)
. Tanks that are removed shall be scrapped unless reused in accordance with s. ATCP 93.350 (3) (i)
or 93.500 (3) (c)
Tank basin and piping trench excavation shall be left open until inspector approves backfilling and tank and piping must remain onsite until inspector approves removal.
ATCP 93.560 Note
Note: For guidance in complying with the tank-cleaning requirements in API standard 2015, as listed on line 17 of Table 93.200-2, API publishes RP 2016, Guidelines and Procedures for Entering and Cleaning Petroleum Storage Tanks, which is available from API at the address listed in the table.
When an underground tank system is closed, or when a previously closed tank system is removed under sub. (4)
, the owner shall have a revised tank registration, form TR-WM-137, and part A of the department's tank-system service and closure assessment report, form TR-WM-140, completed and submitted to the department within 21 business days of closure or removal.
ATCP 93.560 Note
Form TR-WM-137 — Underground Flammable/Combustible/Hazardous Liquid Storage Tank Registration, and form TR-WM-140 – Tank System Service and Closure Assessment Report are available from the Bureau of Weights and Measures, PO Box 8911, Madison, WI 53708-8911, or at telephone (608) 224-4942, or from the Bureau's Web site at https://datcp.wi.gov/Pages/Programs_Services/PetroleumHazStorageTanks.aspx
Underground tanks systems may be closed in-place by filling with an inert, solid material, after emptying and cleaning, if the department determines, upon written request from the owner or operator, that one or more of the following conditions exist:
Excavation would impact the structural integrity of an adjacent building or structure.
Unauthorized encroachment would occur onto neighboring property under different ownership.
Excavation would necessitate the permanent disconnection or relocation of underground utilities.
ATCP 93.560 Note
Note: Closing a tank in-place does not exempt the tank from tank-system site assessment requirements.
The department's Tank System Service and Closure Assessment Report form, TR-WM-140, shall be filled out by the certified remover and provided to the certified tank system inspector at the closure inspection.
Tank-system site assessment.
A tank-system site assessment shall be performed in accordance with ss. ATCP 93.575
after notifying the authorized agent or the department but before closing a tank system in place, installing a new system, or backfilling the tank basin and the piping trenches.
ATCP 93.560 Note
Note: The department and the department of natural resources share jurisdiction over tank closures and tank-system site assessments. The DNR must be notified if a release is discovered.
When directed by the department, the owner or operator of any tank system closed in-place before December 22, 1988, shall have the system removed in accordance with this section and have the tank basin assessed in conformance with s. ATCP 93.580
Systems previously closed without solid, inert fill.
The owner or operator of any tank system that was closed before October 1, 1971, without removing the tank from the site but by filling the tank with water, shall bring the closed system into compliance with sub. (2)
within a time period established by the department on a case-by-case basis, except that the tank-system site assessment in s. ATCP 93.580
is not required unless there is a suspected or obvious release. Written documentation shall be provided to prove closure with water before September 1, 1971.
ATCP 93.560 Note
Note: Before September 1, 1971, ch. Ind 8 — Flammable and Combustible Liquids Code allowed UST systems to be filled with water when closed or abandoned in-place.
Other tank systems.
Empty or improperly closed or abandoned tank systems that do not meet the requirements of sub. (2)
or the exemption under par. (b)
shall be permanently closed in accordance with all of the provisions of this section.
ATCP 93.560 History
History: CR 17-092: cr. Register October 2019 No. 766, eff. 11-1-19; correction in (2) (c), (e) (intro.) made under s. 35.17, Stats., Register October 2019 No. 766. ATCP 93.565(1)(1)
Tank systems that are abandoned with or without product shall be closed within 60 days of non-compliance with s. ATCP 93.545
or in-use tank system requirements.
Abandoned tank systems that are less than 30 years old or of double-wall construction may be returned to service if they all of the following conditions:
The integrity of a fiberglass tank shall be assessed and certified by the manufacturer or a qualified professional engineer. The assessment shall include an internal inspection and certification that the tank is suitable for continued service.
The integrity assessment of a steel tank shall be performed in accordance with API 1631.
Tanks that have an overall average tank metal thickness or an average tank thickness of a designated thin wall area of less than 75 percent or any through-wall perforations shall be immediately closed per s. ATCP 93.560
Tanks that have an overall average tank metal thickness or an average tank thickness of a designated thin wall area of 75 percent to 85 percent shall have an impressed current system installed per s. ATCP 93.520
or be immediately closed per s. ATCP 93.560
The certification and report of the assessment shall be submitted to the department for approval prior to adding product to the tank.
A complete underground tank system functionality verification shall be conducted per s. ATCP 93.510 (2)
. Form TR-WM-139 documenting the verification shall be submitted to the department.
The tank system shall fully comply with this chapter before being placed back into service, except double-wall construction is not newly required for tank systems installed before February 1, 2009.
The tank system shall pass a department storage tank system inspection conducted in accordance with this chapter.
ATCP 93.565 History
History: CR 17-092: cr. Register October 2019 No. 766, eff. 11-1-19; (1) (title) created under s. 13.92 (4) (b) 2., Stats., and correction in (2) (intro.), (b) 1., 7. made under s. 35.17, Stats., Register October 2019 No. 766. ATCP 93.570
ATCP 93.570 Conditions indicating a release.
The owner or operator of a storage tank system shall follow the procedures in s. ATCP 93.575
when any of the following conditions exist or when ordered to do so by the department:
Unusual operating conditions exist, such as erratic behavior of product dispensing equipment, loss of product from the tank system, an unexplained presence of water in the tank, or water or product in the interstitial space of a secondarily contained system.
ATCP 93.570 Note
Significant damage to equipment would be considered to be an unusual operating condition that could result in needing to perform the assessments specified in s. ATCP 93.575
Results from a leak detection method, including an alarm, indicate that a release may have occurred.
Off-site impacts appear, such as the presence of contaminated soils or free product, dissolved phase product or vapors in soils, basements, sewer or utility lines, or nearby waters of the state.
Inventory verification results indicate that a required method of leak detection has failed.
ATCP 93.570 History
History: CR 17-092: cr. Register October 2019 No. 766, eff. 11-1-19. ATCP 93.575
ATCP 93.575 Tank-system integrity assessment. ATCP 93.575(1)(1)
The owner or operator shall assess all suspected or obvious releases in accordance with sub. (2)
within 7 business days of discovery of any of the conditions described in s. ATCP 93.570
, unless any of the following conditions occur:
System equipment or the monitoring device is found to be defective and is immediately repaired, recalibrated or replaced, and additional monitoring does not confirm the initial result.
Inventory control is the method of leak detection, as allowed by s. ATCP 93.510 (3) (d)
, and the data is reevaluated using an additional 7 days of data, and the reevaluation does not show a loss.
The owner or operator shall evaluate and confirm all suspected or obvious releases by taking one or all of the following actions and shall also do so in accordance with any corresponding directive of the department:
For UST systems with secondary containment, the owner or operator shall have the integrity of the interstitial space tested in accordance with one of the following, to determine whether a breach of the interstitial space has occurred:
Requirements developed by the manufacturer, if the manufacturer has developed testing requirements.
An approved standard developed by a nationally recognized association or independent testing laboratory.
Requirements determined by the department to be no less protective of human health and the environment than the requirements listed in this subdivision.
Tank-system site assessment.
The owner or operator shall have the site assessed for the presence of a release in accordance with s. ATCP 93.580
ATCP 93.575 History
History: CR 17-092: cr. Register October 2019 No. 766, eff. 11-1-19. ATCP 93.580(1)(1)
When a tank-system site assessment is required by this chapter, or when directed by the department, the owner or operator shall have the site evaluated for the presence of a suspected or obvious release in accordance with sub. (3)
ATCP 93.580 Note
Note: An “obvious release” means there is an indication of a release, and there is both environmental evidence, such as soil discoloration, observable free product, or odors — and a known source, such as a tank or piping with cracks, holes or rust plugs, or leaking joints. A “suspected release” means either of the following: (a) There is an indication that a tank system has leaked — such as inventory losses; observable free product or evidence of free product in secondary containment at dispensers, submersible pumps or spill buckets; petroleum odors; or leak detection alarm system activation — but there is no observable environmental evidence of a release; or (b) There is observable environmental evidence of a release, such as soil discoloration or free product, but the source is unknown.
Exemption from assessment.
A tank system site assessment is required for the following tank systems or components only if there is a suspected or obvious release:
Tanks which have a capacity of less than 4,000 gallons and which stored heating oil for consumptive use on the premises where stored.
Tanks located at a private residence or on a farm premises, which have a capacity of less than 1,100 gallons, and which stored fuel for dispensing into motorized vehicles.
The closure of double-wall pipe when modification or upgrading is conducted on a system that will remain in operation, unless the piping is to be closed in-place.
Where the entire tank system, including the connections at the tank and dispensers, has been placed in liquid-tight secondary containment for the entire operational life of the system.
When a tank-system site assessment is required, the owner or operator shall have a certified tank-system site assessor document field observations and sample for the presence of a release wherever contamination is identified or is most likely to be present at the tank site. If the assessor discovers obvious contamination, he or she shall complete the appropriate assessment sampling, such as for the entire system; or for only the tank, or piping, or sumps, or dispensers, and complete the documentation and reporting in its entirety. All sampling, documentation, and reporting under this paragraph shall be in a format prescribed by the department.
ATCP 93.580 Note
The sampling documentation and reporting prescribed by the department is contained in Tank System Site Assessment: A Guide to the Assessment and Reporting of Suspected or Obvious Releases from Underground and Aboveground Storage Tank Systems
available from the department's Web site at https://datcp.wi.gov/Documents/TSSA.pdf
ATCP 93.580 Note
In s. ATCP 93.585
, releases are required to be reported to the department of natural resources. Failure to notify the DNR of a release may have serious consequences – such as forfeitures under s. 168.26
, Stats., of $10 to $5,000 for each violation. Each day of continued violation is a separate offense, and under s. ATCP 93.180
, each tank that is in violation is a separate offense.
A person who is not a certified tank-system site assessor may perform assessments if directly supervised by a certified tank-system site assessor who is on the site during the entire assessment.
The documentation required in par. (a)
shall be filed with the owner or operator no later than 21 business days after discovery of the conditions that resulted in the assessment.
For all tank or piping removals, any replacement of single-wall spill containment under s. ATCP 93.505 (2) (a)
, and for all releases that must be reported to the department of natural resources under s. ATCP 93.585 (2)
, the documentation required in par. (a)
shall also be filed with the department of natural resources no later than 21 business days after the tank or component removal or the discovery of the release.
ATCP 93.580 Note
Send the documentation that must be filed with the department of natural resources under this section to the Environmental Program Associate in the applicable DNR regional office. Contact information for the Environmental Program Associates is available through the following DNR Web site: http://dnr.wi.gov/topic/brownfields/contact.html
ATCP 93.580 History
History: CR 17-092: cr. Register October 2019 No. 766, eff. 11-1-19. ATCP 93.585
ATCP 93.585 Responding to a leak, spill, overfill or release. ATCP 93.585(1)(a)(a)
Immediately upon discovery of any evidence of a leak from a tank system or dispensing system, the owner or operator or any contractor performing work under this chapter shall take all measures necessary to stop the leak and to prevent migration of any free product into the environment.
Immediately upon confirming any suspected release or discovering any obvious release, the owner or operator shall investigate the extent of contamination, and undertake corrective and mitigation actions in accordance with s. 292.11 (3)
Reporting to the department of natural resources.
The owner or operator or a person who causes it shall immediately report any release of a regulated substance to the department of natural resources in accordance with s. 292.11 (2)
ATCP 93.585 Note
Releases that must be reported to the department of natural resources under s. 292.11 (2)
, Stats., include the discovery of contaminated soils or free product; dissolved phase product or vapors, in soils, in basements, in sewer or utility lines, or in surface water or groundwater either at the tank site or in the surrounding area; and spills or overfills.