Temporary Closure is an option that tank owners may choose when they decide not to use the tanks for a period of time. Proper temporary closure is referred to as Extended-Out-Of-Use (EOU). In order for a facility to remain in compliance while out-of-use, the following requirements must be met:
When an UST system is temporarily closed for more than 12 months, the tank system must be permanently closed if it does not meet the cathodic protection requirements found in R.61-92, Part 280.20 and 280.21.
There are two acceptable methods for permanent closure, removal from the ground (recommended) and fill-in-place with an approved inert solid substance such as concrete slurry, flowable foam and sand.
At least 30 days prior to beginning closure activities, an accurately filled out Tank and Sludge Disposal Form (pdf) must be submitted to the Division.
Points to consider:
Once all information is received and deemed acceptable, an approval letter will be mailed out to the tank owner. The tank owner must then give 48-hours notice prior to the actual closure (removal or fill-in-place) event so that a Division representative may be present.
Soil sampling is required at all permanent closures. Information about sampling requirements can be found in the Underground Storage Tank Assessment Report(pdf) as well as the Analytical Methodology for Groundwater and Soil Assessment Guidelines (pdf). A Closure Report must be submitted to the Division within 60 days of the closure event. Please contact the Division with any questions regarding closure or sampling specifics.
Effective May 26, 2017 the Department must be notified IN WRITING 30 days prior to permanently closing, make a change-in-service or replacing previously installed piping and dispensers. (A change-in-service is switching from a non-regulated substance to a regulated substance or switching from a regulated substance to a non-regulated substance) NOTE: A regulated substance includes a substance greater than 10 percent ethanol, greater than 20 percent biodiesel or any other regulated substance identified by DHEC. See Alternative Fuels page here.