Document ID: chunk:federal_register_of_legislation:F2024C00833:reg:4:p5
Version: federal_register_of_legislation:F2024C00833
Segment Type: reg
Provision Reference: reg 4 (pt 5/13)
Character Range: 118942–122046

is available for the source, the total mass of emissions for a gas from the source for the year calculated under this section must be reconciled against an estimate for that gas from the facility for the same period calculated using method 1 for that source.

1.21A  Emissions from a source where multiple fuels consumed
  If more than one fuel is consumed for a source that generates carbon dioxide that is directly measured using method 4 (CEM), the total amount of carbon dioxide is to be attributed to each fuel consumed in proportion to the carbon content of the fuel relative to the total carbon content of all fuel consumed for that source.

Subdivision 1.3.2.2—Method 4 (CEM)—use of equipment

1.22  Overview
  The following apply to the use of equipment for CEM:
 (a) the requirements in section 1.23 about location of the sampling positions for the CEM equipment;
 (b) the requirements in section 1.24 about measurement of volumetric flow rates in the gas stream;
 (c) the requirements in section 1.25 about measurement of the concentrations of greenhouse gas in the gas stream;
 (d) the requirements in section 1.26 about frequency of measurement.

1.23  Selection of sampling positions for CEM equipment
  For paragraph 1.22(a), the location of sampling positions for the CEM equipment in relation to the gas stream must be selected in accordance with an appropriate standard.
Note: Appropriate standards include:
                 * AS 4323.1—1995 Stationary source emissions ‑ Selection of sampling positions.
                 * AS 4323[1].1—1995 Amdt 1‑1995 Stationary source emissions ‑ Selection of sampling positions.
                 * ISO 10396:2007 Stationary source emissions ‑ Sampling for the automated determination of gas emission concentrations for permanently‑installed monitoring systems.
                 * ISO 10012:2003 Measurement management systems ‑ Requirements for measurement processes and measuring equipment.
                 * USEPA – Method 1 – Sample and Velocity Traverses for Stationary Sources (2000).

1.24  Measurement of flow rates by CEM
  For paragraph 1.22(b), the measurement of the volumetric flow rates by CEM of the gas stream must be undertaken in accordance with an appropriate standard.
Note: Appropriate standards include:
                 * ISO 10780:1994 Stationary source emissions—Measurement of velocity and volume flowrate of gas streams in ducts.
                 * ISO 14164:1999 Stationary source emissions—Determination of the volume flowrate of gas streams in ducts ‑ Automated method.
                 * USEPA Method 2 Determination of Stack Gas Velocity and Volumetric flowrate (Type S Pitot tube) (2000).
                 * USEPA Method 2A Direct Measurement of Gas Volume Through Pipes and Small Ducts (2000).

1.25  Measurement of gas concentrations by 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