What is the maximum time allowed for vent lines to be closed during temporary closure?

The maximum time allowed for vent lines to be closed during temporary closure is three months. This regulation is in place to ensure safety and environmental protection by allowing sufficient time for monitoring and maintenance activities without prolonged disruption to the ventilation of the underground storage tank system. Proper management of vent lines is crucial for preventing the build-up of pressure or the release of hazardous vapors, which can pose safety risks. Adhering to this time limit also supports compliance with local and federal regulations governing the operation of underground storage tanks, ensuring that operators take prompt action in managing their systems responsibly.