The following exemptions apply.(1) Batch process operations at an account that has total volatile organic compound (VOC) emissions (determined before control but after the last recovery device) of less than the following rates from all stationary emission sources included in the account are exempt from the requirements of this division (relating to Batch Processes), except for §115.161(b) and (c) of this title (relating to Applicability):(A) 50 tons per year (tpy) in the Beaumont-Port Arthur area; (B) 25 tpy in the Houston-Galveston-Brazoria area; and (C) 100 tpy in the Bexar County area.(2) The following are exempt from the requirements of this division, except for §§115.161(b) and (c), 115.164, and 115.166(2) and (3) of this title (relating to Applicability; Determination of Emissions and Flow Rates; and Monitoring and Recordkeeping Requirements). (A) Combined vents from a batch process train that have the following annual mass emissions total.Attached Graphic(B) Single unit operations that have an annual mass emissions total of 500 pounds per year or less.