When a combustion device is used to comply with the 20 parts per million by volume outlet concentration standard specified in
§ 63.113(a)(2), the correction to 3 percent oxygen is only required when supplemental combustion air is used to combust the emissions, for the purposes of this subpart. In addition, the correction to 3 percent oxygen specified in §
63.116(c)(3) and
(c)(3)(iii) is only required when supplemental combustion air is used to combust the emissions, for the purposes of this subpart. Finally, when a combustion device is used to comply with the 20 parts per million by volume outlet concentration standard specified in
§ 63.113(a)(2), an owner or operator shall record and report the outlet concentration required in §
63.117(a)(4)(ii) and
(a)(4)(iv) corrected to 3 percent oxygen when supplemental combustion air is used to combust the emissions, for the purposes of this subpart. When supplemental combustion air is not used to combust the emissions, an owner or operator may record and report the outlet concentration required in §
63.117(a)(4)(ii) and
(a)(4)(iv) on an uncorrected basis or corrected to 3 percent oxygen, for the purposes of this subpart.