On January 30, 2020, Region 1 and the Boro Sand and Stone Corp. (Boro) settled an administrative penalty case for alleged violations of Clean Air Act (CAA) regulations that occurred at Boro's concrete, washed stone, and sand production facility in North Attleboro, Massachusetts. EPA alleged that Boro violated federal CAA regulations at two of the facility's rock crushers that used diesel generators for electric power. After receiving an EPA notice of the violations, Boro stopped using the diesel generators and arranged for a new utility line to supply electric power instead. Boro has agreed to pay a total penalty of $90,300. The two CAA regulations at issue are not delegated to the state and can only be enforced by EPA.