(a) An owner or operator of any portland cement kiln that is subject to the source cap of §117.3123 of this title (relating to Dallas-Fort Worth Eight-Hour Ozone Attainment Demonstration Control Requirements) shall comply with the following monitoring requirements.
  (1) The nitrogen oxides (NOX ) monitoring requirements of §117.3140 of this title (relating to Continuous Demonstration of Compliance) apply. The following requirements also apply.
    (A) For a single portland cement kiln with multiple exhaust stacks, each individual stack must be analyzed separately.
    (B) One continuous emission monitoring system (CEMS) may be shared among portland cement kilns or among multiple exhaust stacks on a single portland cement kiln, provided:
      (i) the exhaust stream of each stack is analyzed and reported separately; and
      (ii) the CEMS meets the certification requirements of §117.3140(b) of this title for each exhaust stream while the CEMS is operating in the time-shared mode.
    (C) All bypass stacks must be monitored continuously, in order to quantify emissions directed through the bypass stack. If the CEMS is located upstream of the bypass stack then:
      (i) no effluent streams from other potential sources of NOX emissions may be introduced between the CEMS and the bypass stack; and
      (ii) the owner or operator shall install, operate, and maintain a continuous monitoring system to record automatically the date, time, and duration of each event when the bypass stack is open.
  (2) Stack exhaust flow rate must be monitored with a flow meter using the monitoring specifications of 40 Code of Federal Regulations (CFR) Part 60, Appendix B, Performance Specification 6 or 40 CFR Part 75, Appendix A.
  (3) For portland cement kilns that inject ammonia or urea for NOX control, fuel type notwithstanding, ammonia emissions must be monitored according to one of the methods specified in §117.8130(1), (2), or (4) of this title (relating to Ammonia Monitoring) to demonstrate compliance with the ammonia emission specification in §117.3123(f) of this title. The ammonia monitoring requirements of this paragraph only apply from March 1 to October 31 of each calendar year, or any other time the owner or operator injects ammonia or urea for NOX control.
  (4) Installation of monitors must be performed in accordance with the schedule specified in §117.9320(c) of this title (relating to Compliance Schedule for Cement Kilns).
(b) The owner or operator of a portland cement kiln subject to the source cap requirements of §117.3123 of this title shall calculate NOX emissions for determining compliance with the source cap as follows. The calculation requirements of this subsection only apply from March 1 to October 31 of each calendar year.
  (1) Hourly NOX emissions. Hourly NOX emissions for each kiln must be calculated according to the following equation.
Attached Graphic
  (2) Daily NOX emissions. The daily total NOX emission for each kiln must be calculated as the sum of the hourly NOX emissions for each calendar day, reported in tons per day, and must be calculated according to the following equation.
Attached Graphic
  (3) Thirty-day rolling average. The 30-day rolling average NOX emissions for the account must be calculated according to the following equation.
Attached Graphic

Source Note: The provisions of this §117.3142 adopted to be effective June 14, 2007, 32 TexReg 3206