Wisconsin Administrative Code
Department of Agriculture, Trade and Consumer Protection
ATCP 90-139 - Trade and Consumer Protection
Chapter ATCP 93 - Flammable, Combustible, And Hazardous Liquids
Subchapter IV - General AST Storage
Section ATCP 93.465 - Tank-system site assessment

(a) Tank-system site assessments for aboveground tanks shall comply with this section and the assessment requirements in s. ATCP 93.580, except as provided in sub. (2).

(b) Tank-system site assessments for aboveground storage tank systems shall include assessment of any underground piping, the loading rack or transfer area, and the area under each tank; and shall be performed after notifying the authorized agent or the department but before completing any permanent closure.

Note: For further information on sampling and reporting for these assessments, see the department's Tank System Site Assessment: A Guide to the Assessment and Reporting of Suspected or Obvious Releases From Underground and Aboveground Storage Tank Systems https://datcp.wi.gov/Pages/Programs_Services/PetroleumHazStorageTanksForms.aspx.

(a) Aboveground storage tanks or underground piping that have been placed in secondary containment complying with s. ATCP 93.420(2) (d), (e) or (g) for their entire operational life, and loading rack or transfer areas that have been placed in secondary containment complying with s. ATCP 93.420(5) for their entire operational life are exempt from tank-system site assessment requirements, unless there is a suspected or obvious release outside the secondary containment.

(b) Aboveground storage tanks that have a capacity of less than 5,000 gallons are exempt from tank-system site assessment requirements unless a suspected or obvious release is present.

(c) A tank-system site assessment is not required for closure of double-wall pipe when modification or upgrading is conducted on an existing system that will remain in operation, unless a suspected or obvious release is present.