(a) The owner or operator of a Group 1 miscellaneous process vent as defined in Sec. 63.641 shall comply with the requirements of either paragraphs (a)(1) or (a)(2) of this section.
(1) Reduce emissions of organic HAP's using a flare that meets the requirements of Sec. 63.11(b) of subpart A of this part.
(2) Reduce emissions of organic HAP's, using a control device, by 98 weight-percent or to a concentration of 20 parts per million by volume, on a dry basis, corrected to 3 percent oxygen, whichever is less stringent. Compliance can be determined by measuring either organic HAP's or TOC's using the procedures in Sec. 63.645.
(b) If a boiler or process heater is used to comply with the percentage of reduction requirement or concentration limit specified in paragraph (a)(2) of this section, then the vent stream shall be introduced into the flame zone of such a device, or in a location such that the required percent reduction or concentration is achieved. Testing and monitoring is required only as specified in Sec. Sec. 63.644(a) and 63.645 of this subpart.