When required by this chapter, the owner or operator shall monitor carbon monoxide (CO) exhaust emissions from an affected unit using one or more of the following methods:
  (1) install, calibrate, maintain, and operate a:
    (A) continuous emissions monitoring system (CEMS) in accordance with §117.8100(a) or §117.8110(a) of this title (relating to Emission Monitoring System Requirements for Industrial, Commercial, and Institutional Sources; and Emission Monitoring System Requirements for Utility Electric Generation Sources), as applicable; or
    (B) predictive emissions monitoring system (PEMS) in accordance with §117.8100(b) or §117.8110(b) of this title, as applicable; or
  (2) sample CO as follows:
    (A) with a portable analyzer (or 40 Code of Federal Regulations (CFR) Part 60, Appendix A reference method test apparatus) after manual combustion tuning or manual burner adjustments conducted for the purpose of minimizing nitrogen oxides (NOX ) emissions whenever, following such manual changes, either of the following occur:
      (i) NOX emissions are sampled with a portable analyzer or 40 CFR Part 60, Appendix A reference method test apparatus; or
      (ii) the resulting NOX emissions measured by CEMS or predicted by PEMS are lower than levels when CO emissions data was previously gathered; and
    (B) sample CO emissions using the test methods and procedures of 40 CFR Part 60 in conjunction with any relative accuracy test audit of the NOX and diluent analyzer.

Source Note: The provisions of this §117.8120 adopted to be effective June 14, 2007, 32 TexReg 3206