Approval and Promulgation of Air Quality Implementation Plans; Maryland; State Implementation Plan Revision for American Cyanamid Company, Havre de Grace, MD

EPA is approving a State Implementation Plan (SIP) revision submitted by the State of Maryland. The intended effect of this action is to remove an August 2, 1984 Secretarial Order (Order) from the Maryland SIP. The Order constituted a Plan for Compliance (PFC) and an alternative method of assessing compliance at an American Cyanamid Company (Company) facility located in Havre de Grace, Harford County, Maryland (the Facility). The Order allowed for certain volatile organic compound (VOC) emissions sources at the Facility to achieve compliance with emissions limits through averaging (or "bubbling") of emissions over a 24-hour period. Removal of the Order from the SIP will remove the "bubbling" compliance option for these sources at the Facility. In lieu of "bubbling," the sources must comply with the approved and more stringent Maryland SIP provisions for the control of VOC emissions, which do not allow averaging or "bubbling." This action is being taken under the Clean Air Act (CAA or the Act).