Tank-System Site Assessment (TSSA)
The process by which the department expects tank-system owners or operators to determine if a tank system or any component of that system has released petroleum products or other hazardous substances into the soil, groundwater or surface waters. This process includes all of the following:
a. Observation of field conditions, such as stained soils; odors; pitting, holes or cracks in tank system components; observable leaks; and elevated in-field soil-gas readings.
b. Collection of soil samples for laboratory analysis of petroleum products or other hazardous substances, as prescribed in the department’s Assessment and Reporting of Suspected and Obvious Releases From Underground and Aboveground Storage Tank Systems.
c. Reporting of the field observations and sampling results in a format prescribed by the department.
Note: In general, TSSAs are to be performed at the time a storage tank system, or some component thereof, is to be permanently closed, upgraded or repaired, or if a change in service is to take place.
Note: Assessment and Reporting of Suspected and Obvious Releases From Underground and Aboveground Storage Tank Systems (Publication #ERS-10874) is available from the Division of Environmental and Regulatory Services at P.O. Box 7837, Madison, WI, 53707-7837, or at telephone (608) 266-7874, or from the Division’s Web site at http://www.commerce.state.wi.us/ER/ER-BST-FM- Comm10Forms.html.