(a) For all affected persons in the Beaumont-Port Arthur, Bexar County, Dallas-Fort Worth, El Paso, and Houston-Galveston-Brazoria areas, as defined in §115.10 of this title (relating to Definitions), the following emission specifications on vacuum-producing systems shall apply.(1) No person may be allowed to emit any volatile organic compound (VOC) from a steam ejector or mechanical vacuum pump in a petroleum refinery unless the vent stream is controlled properly in accordance with §115.312(a)(2) of this title (relating to Control Requirements).(2) No person may be allowed to emit any VOC from a hotwell with a contact condenser unless the hotwell is covered and the vapors from the hotwell are controlled properly in accordance with §115.312(a)(2) of this title.(b) For all affected persons in Gregg, Nueces, and Victoria Counties, the following emission specifications on vacuum-producing systems shall apply.(1) No person may be allowed to emit any VOC from a steam ejector or mechanical vacuum pump in a petroleum refinery, unless the vent stream is controlled properly in accordance with §115.312(b)(2) of this title.(2) No person may be allowed to emit any VOC from a hotwell with a contact condenser, unless the hotwell is covered and the vapors from the hotwell are controlled properly in accordance with §115.312(b)(2) of this title.