THE FACILITY EMITS LESS THAN 4 TPY OF STYRENE, WHICH IS A HAP, BUT HAS POTENTIAL EMISSIONS ABOVE 10 TPY, SUBJECTING IT TO THE COMPOSITES NESHAP. AS A MAJOR SOURCE OF HAP THAT DID NOT OBTAIN A STATE SYNTHETIC MINOR PERMIT BEFORE THE APPLICABILLITY DATE OF APRIL 21, 2006, MUSTANG IS SUBJECT TO THE ONCE-IN, ALWAYS IN POLICY, AND IS REQUIRED TO COMPLY WITH THE NESHAP AND TO APPLY FOR A TITLE V PERMIT.