Wisconsin Administrative Code ATCP 93 defines “Temporarily out-of-service” as a storage tank system that is not being used, but is intended to be placed back into operation within the next annual permit renewal period.
ATCP 93.140(2)(d)1 requires tank system owners to register changes, including moving a tank system into and out of temporarily out of service status, within 15 days of the change using form TR-WM-137 which can be found here: https://datcp.wi.gov/Documents/TR-WM-137.pdf
When a storage tank system is placed temporarily out of service, the owner or operator must comply with all of the following:
- Leak detection must be maintained in accordance with ATCP 93 unless all liquid has been removed from the tank and the associated piping so that no more than 1 inch of residue remains in the system.
- Operation and maintenance of corrosion protection systems must be continued.
- The tank must be protected against flotation caused by flooding or soil saturation.
- The tank, piping, dispensing equipment, lines, pumps, manways, and other ancillary equipment must be secured to prevent tampering.
- All vent lines must be left open and functioning.
- All periodic inspections and maintenance must be performed as if the tankwere still in service including, but not limited to:
- Monthly water checks, including empty tanks
- Required testing of the cathodic protection system
- Required lining inspections
- PEI 900 inspections
- Permits to operate must be maintained in accordance with ATCP 93.145.
- Financial responsibility requirements of ATCP 93 Subchapter VII must bemaintained.Before placing a tank back into service:
A precision tightness test must be performed on the tank and piping in accordance with ATCP 93.515 (4).
Immediately have the leak detection system verified in accordance with ATCP 93.510 (2).
Tank systems out of service for more than 365 days must:
- Have a pressure test of the ullage portion to assure that tank connections are tight.
- FullycomplywithATCP93,exceptdouble-wallconstructionisnot required for tank systems installed before February 1, 2009.
Tank systems that are placed out of service which do not comply with all requirements of ATCP 93.545 must be permanently closed in accordance with ATCP 93.560 within 60 calendar days.
In order to close a storage tank, the owner or operator must notify DATCP at least five business days before beginning permanent closure of a tank system using form TR-WM-121.
To permanently close an underground tank system, the owner or operator must comply with the following requirements per Wis. Admin. Code § ATCP 93.560
- Empty and clean the tank and piping using a process that complies with the national standard referenced in Wis. Admin. Code § ATCP 93.200. Individuals cleaning the tanks or removing tanks or portions of tanks systems must be certified. A list of certified remover/cleaners can be found on our website here: https://mydatcp.wi.gov/documents/dtcp/Tank_Certification_by_Certificate_Typ e_TSRC.pdf
- Complete the revised tank registration form TR-WM-137 and submit it to DATCP within 21 business days of closure or removal.
- Perform a tank-system site assessment in accordance with Wis. Admin. Code § ATCP 93.560(3) and the TSSA Guide.In most circumstances underground tanks systems must be removed. However, if one or more of the following conditions exist, the owner or operator may submit a written request to DATCP to close the tank system in-place by filling with an inert, solid material, after emptying and cleaning:
- Excavation would impact the structural integrity of an adjacent building or structure.
- Overhead utilities at a commercial site pose a safety hazard.
- Excavation would impact adjacent transformers or substations.
- Unauthorized encroachment would occur onto neighboring property under differentownership.
- The tank location is inaccessible to necessary equipment.
- Excavation would result in the destruction of mature trees.
- Excavation would encroach upon a public way.
- Excavation would necessitate the disconnection or relocation of underground utilities.Closing a tank in-place does not exempt the tank from tank-system site assessment requirements.