On December 28, 2018, Region 1 executed and filed a Notice of Violation and Administrative Consent Order (ACO) that requires the Town of Brookline to conduct a Process Hazard Review of its rink's ice-making system in accordance with the first duty of the General Duty Clause, found at CAA Section 112(r)(1). Brookline has agreed to the ACO and executed the agreement on December 18, 2018. Once Brookline started its hazard review process, it found several safety improvements that it should make, which are listed in the ACO. Region 1 undertook this action after an ammonia release occurred at the rink. This action is part of the National Compliance Initiative for Chemical Accident Risk Reduction. Also, certain General Duty Clause actions require approval by the Assistant Administrator for OECA.