The requirements within the ACO will return Emerald to compliance with the Illinois State Implementation Plan (IL SIP), its Title V Permit and the National Emission Standard for Hazardous Air Pollutants (NESHAP) for Off-Site Waste and Recovery Operations at 40 C.F.R. Part 63, Subpart DD. EPA issued a Notice and Finding of Violation to Emerald on November 20, 2012 for violations of the IL SIP and its Title V Permit for exceeding the 8 lb/hr photochemically reactive chemical limit at its wastewater treatment plant. EPA also issued a Finding of Violation on April 8, 2008 for violations of the NESHAP for Off-Site Waste and Recovery Operations. Emerald and EPA believe the 8 lbs/hr exceedance was caused by inaccurate records. Emerald will prevent this by updating its photochemically reactive chemical inventory procedures to ensure an exceedance does not occur in the future. In addition, Emerald will conduct sampling, over a 12 month period, of its incoming off-site wastewater streams to determine whether it meets the 1 megagram exemption initially and on an ongoing basis. If Emerald meets the exemption, Emerald will only need to comply with the recordkeeping provisions of the NESHAP. If Emerald does not meet the exemption, Emerald will need to comply with the control standards of the NESHAP. Emerald will implement a process to ensure that it will continue to meet the NESHAPÂs 1 megagram exemption after the sampling has been concluded. Lastly, Emerald will track all volatil