| (2) for wood fuel-fired boilers or process heaters, 775 ppmv at 7.0% O2, dry basis; and (3) for units equipped with CEMS or PEMS for CO, the limits of paragraphs (1) and (2) of this subsection apply on a rolling 24-hour averaging period. For units not equipped with CEMS or PEMS for CO, the specifications apply on a one-hour average. (f) No person shall allow the discharge into the atmosphere from any unit subject to a NOX emission specification in this section (including an alternative to the NO X limit in this section under §117.315 or §117.323 of this title) ammonia emissions in excess of 20 ppmv based on a block one-hour averaging period. (g) This section no longer applies after the appropriate compliance date(s) for emission specifications for attainment demonstration given in §117.9020(2) of this title. For purposes of this subsection, this means that the RACT emission specifications of this section remain in effect until the emissions allocation for a unit under the Houston-Galveston-Brazoria mass emissions cap are equal to or less than the allocation that would be calculated using the RACT emission specifications of this section. |
