# 75.35 Missing data procedures for CO..
(a) The owner or operator of a unit with a CO<sub>2</sub> continuous emission monitoring system for determining CO<sub>2</sub> mass emissions in accordance with § 75.10 (or an O<sub>2</sub> monitor that is used to determine CO<sub>2</sub> concentration in accordance with appendix F to this part) shall substitute for missing CO<sub>2</sub> pollutant concentration data using the procedures of paragraphs (b) and (d) of this section.
(b) During the first 720 quality-assured monitor operating hours following initial certification at a particular unit or stack location (*i.e.*, the date and time at which quality-assured data begins to be recorded by a CEMS at that location), or (when implementing these procedures for a previously certified CO<sub>2</sub> monitoring system) during the 720 quality-assured monitor operating hours preceding implementation of the standard missing data procedures in paragraph (d) of this section, the owner or operator shall provide substitute CO<sub>2</sub> pollutant concentration data or substitute CO<sub>2</sub> data for heat input determination, as applicable, according to the procedures in § 75.31(b).
(c) [Reserved]
(d) Upon completion of 720 quality-assured monitor operating hours using the initial missing data procedures of § 75.31(b), the owner or operator shall provide substitute data for CO<sub>2</sub> concentration or substitute CO<sub>2</sub> data for heat input determination, as applicable, in accordance with the procedures in § 75.33(b) except that the term “CO<sub>2</sub> concentration” shall apply rather than “SO<sub>2</sub> concentration,” the term “CO<sub>2</sub> pollutant concentration monitor” or “CO<sub>2</sub> diluent monitor” shall apply rather than “SO<sub>2</sub> pollutant concentration monitor,” and the term “maximum potential CO<sub>2</sub> concentration, as defined in section 2.1.3.1 of appendix A to this part” shall apply, rather than “maximum potential SO<sub>2</sub> concentration.”
[67 FR 40439, June 12, 2002]