Aboveground storage tank requirements

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� , � For three years Other regulated substance ASTs All service check and equipment calibration records considered temporary must be kept for three years. All periodic monitoring Other regulated substance ASTs that are on site between (72-hour, weekly and monthly)records must be kept for 30 days and a year are considered temporary tanks and three years. Documentation for monitoring must include must meet the temporary tank requirements. These ASTs the name of the person conducting the monitoring,the must be labeled"Temporary Storage"and show the date method used,the date of the monitoring, and the the storage began. monitoring results.The owner or operator must keep records indicating that the AST was taken out of service If a person is not on site 24 hours a day,a sign must be in compliance with regulations. These records must be posted with the name,address, and telephone number of kept for three years. the facility owner or operator, or a local emergency response contact. The sign must be posted so that it can Discharges to a secondary containment be seen outside any containment area. area Finally,the secondary containment area must be An owner or operator of another regulated substance constructed and maintained according to the standards AST must immediately investigate a suspected release to for ASTs installed before November 2, 1998. a secondary containment area. Moving other regulated substance ASTs The owner or operator must assess the secondary If another regulated substance AST is moved from one containment area for damage where product release site to another, the tank must be determined to be sound occurred and make any necessary repairs. by conducting one of the following leak tests before it is The owner or operator must notify the Minnesota Duty put back into use. Officer immediately of discharges to the secondary . tracer gas test containment area or of other releases. They can be reached at 800-422-0798 or 651-649-5451. • vacuum test • air pressure test Out-of-service requirements . hydrostatic test When another regulated substance AST is no longer If the other regulated substance AST is moved within the used, it must be taken out of service or removed. same site and put back into use, it must be determined to To take the tank system out of service,the tank owner or be sound through a thorough internal and external operator must: cleaning,degassing, and inspection. You can also conduct one of the leak tests above to determine the • Remove all substances from the AST, connected integrity of the tank. piping, and appurtenances. • Secure the AST to prevent unauthorized entrance or AST design standards tampering. An underground storage tank cannot be used as an AST. • Thoroughly clean the interior of the tank and piping Also,AST providers must comply with industry tank of all sludge, solids, and residuals. and piping design and construction standards. • Dispose of tank bottom sludge according to Need more information? applicable state and federal regulations. Visit the AST Program at • Render the tank free of vapors. http://www.pca.state.mn.us/cleanup/ast.html. The site • Label the tank exterior"Out of Service,"and the has forms, fact sheets, and other information about date the tank was removed from service. ASTs and AST requirements. You can also call the MPCA at 651-296-6300 or 1-800-657-3864. Other Regulated Substance Requirements for Mtnnesoca vollut�or� Aboveground Storage Tank • t-a2-07 • April 2004 �- tontrolA9e�cy Page 3