Region 1 and Kimball Sand Company, Inc. ( Kimball Sand ) entered into a Consent Agreement and Final Order ( CAFO ) to resolve Clean Air Act ( CAA ) violations at Kimball Sand?s two facilities in Blackstone and Northborough, Massachusetts. Under the CAFO, Kimball Sand agrees to pay a penalty of $120,000 to settle alleged violations of certain provisions of the (1) New Source Performance Standards for Nonmetallic Mineral Processing Plants, found at 40 C.F.R. Part 60, Subpart OOO, and (2) National Emission Standards for Hazardous Air Pollutants for Stationary Reciprocating Internal Combustion Engines, found at 40 C.F.R. Part 63, Subpart ZZZZ. Kimball Sand operates stone crushing and gravel processing operations at the facilities.