Document ID: chunk:federal_register_of_legislation:F2024C00833:reg:4:p6
Version: federal_register_of_legislation:F2024C00833
Segment Type: reg
Provision Reference: reg 4 (pt 6/13)
Character Range: 121770–124645

CEM
  For paragraph 1.22(c), the measurement of the concentrations of gas in the gas stream by CEM must be undertaken in accordance with an appropriate standard.
Note: Appropriate standards include:
                 * USEPA Method 3A Determination of oxygen and carbon dioxide concentrations in emissions from stationary sources (instrumental analyzer procedure) (2006).
                 * USEPA Method 3C Determination of carbon dioxide, methane, nitrogen, and oxygen from stationary sources (1996).
                 * ISO 12039:2001 Stationary source emissions—Determination of carbon monoxide, carbon dioxide and oxygen—Performance characteristics and calibration of automated measuring system.

1.26  Frequency of measurement by CEM
 (1) For paragraph 1.22(d), measurements by CEM must be taken frequently enough to produce data that is representative and unbiased.
 (2) For subsection (1), if part of the CEM equipment is not operating for a period, readings taken during periods when the equipment was operating may be used to estimate data on a pro rata basis for the period that the equipment was not operating.
 (3) Frequency of measurement will also be affected by the nature of the equipment.
Example: If the equipment is designed to measure only one substance, for example, carbon dioxide or methane, measurements might be made every minute. However, if the equipment is designed to measure different substances in alternate time periods, measurements might be made much less frequently, for example, every 15 minutes.
 (4) The CEM equipment must operate for more than 90% of the period for which it is used to monitor an emission.
 (5) In working out the period during which CEM equipment is being used to monitor for the purposes of subsection (4), exclude downtime taken for the calibration of equipment.

Division 1.3.3—Operation of method 4 (PEM)

Subdivision 1.3.3.1—Method 4 (PEM)

1.27  Method 4 (PEM)—estimation of emissions
 (1) To obtain an estimate of the mass emissions rate of methane, carbon dioxide or nitrous oxide released at the time of measurement at a monitoring site within the area occupied for the operation of a facility, the formula in subsection 1.21(1) must be applied.
 (2) The mass of emissions estimated under the formula must be converted into CO2‑e tonnes.
 (3) The average mass emissions rate for the gas measured in CO2‑e tonnes per hour for a year must be calculated from the estimates obtained under subsection (1).
 (4) The total mass of emissions of the gas for the year is calculated by multiplying the average emissions rate obtained under subsection (3) by the number of hours during the year when the site was operating.
 (5) If method 1 is available for the source, the total mass of emissions of the gas for a year calculated under this section must be reconciled against an estimate for that gas from the site for the