Chapters 691 and 693

Maine Department of Environmental Protection

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Chapters 691 and 693
08/03/2018 09:54 AM EDT

The Department is proposing to update its Chapter 691 and 693 underground oil storage rules to include requirements under federal regulations that were passed in 2015. This will allow the Department to seek reauthorization for Maine’s underground oil storage tank program. The proposal also removes outdated aspects of the rule and other minor language improvements.

Most of the proposed changes to Ch. 691 are in accordance with the EPA’s regulatory changes in 2015. States with delegated authority such as Maine, are required to achieve regulatory consistency by October 13, 2018. The major changes within this rule, which are needed to gain consistency with federal regulations, include:

– Sump testing every 3 years, unless the sump is double walled, to ensure sumps are liquid tight Changing the annual statistical inventory analysis leak detection method to monthly statistical inventory reconciliation. Currently 7 facilities would need to make this change and DEP staff has met with each facility (the last of these tanks are scheduled to be removed by August 1, 2019);
– Facilities may remain temporarily out of service for up to 12 months, a reduction from the current 24 months; however, approval to remain out of service for longer periods of time may be obtained from the Commissioner;
– Discharge investigation, response and corrective action is required for aboveground tanks associated with field constructed tanks or airport hydrant systems and wastewater treatment tank systems not regulated by the federal NPDES or pretreatment programs;
– Aligning discharge investigation and corrective actions to federal rules for protection of surface waters and consistency between the state and federal rules; and
– Installation of double walled spill buckets for new or replacement construction, eliminating the need for the 3-year sump testing.

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