(a) You must control HAP emissions from each new and existing surface impoundment subject to Sec. 63.7886(b)(1)(iii) according to emissions limitations and work practice standards in this section that apply to your affected surface impoundments.
(b) For each affected surface impoundment, you must install and operate air pollution controls that meet either of the options in paragraphs (b)(1) or (2) of this section.
(1) Install and operate a floating membrane cover according to the requirements in Sec. 63.942; or
(2) Install and operate a cover vented through a closed vent system to a control device according to the requirements in Sec. 63.943. You must meet the emissions limitations and work practice standards in Sec. 63.7925 that apply to your closed vent system and control device.
(c) As provided in Sec. 63.6(g), you may request approval from the EPA to use an alternative to the work practice standards in this section that apply to your surface impoundments. If you request for permission to use an alternative to the work practice standards, you must submit the information described in Sec. 63.6(g)(2).