Code of Federal Regulations Title 40. Protection of Environment § 40.98.293 Calculating GHG emissions

(1) Calculate and report under this subpart the combined process and combustion CO₂ emissions by operating and maintaining a CEMS to measure CO₂ emissions according to the Tier 4 Calculation Methodology specified in § 98.33(a)(4) and all associated requirements for Tier 4 in subpart C of this part (General Stationary Fuel Combustion Sources).

(2) Use either Equation CC–1 or Equation CC–2 of this section to calculate annual CO₂ process emissions from each manufacturing line that calcines trona to produce soda ash:

Where:

E_k = Annual CO₂ process emissions from each manufacturing line, k (metric tons).

(IC_T)_n = Inorganic carbon content (percent by weight, expressed as a decimal fraction) in trona input, from the carbon analysis results for month n. This represents the ratio of trona to trona ore.

(IC_sa)_n = Inorganic carbon content (percent by weight, expressed as a decimal fraction) in soda ash output, from the carbon analysis results for month n. This represents the purity of the soda ash produced.

(T_t)_n = Mass of trona input in month n (tons).

(T_sa)_n = Mass of soda ash output in month n (tons).

2000/2205 = Conversion factor to convert tons to metric tons.

0.097/1 = Ratio of ton of CO₂ emitted for each ton of trona.

0.138/1 = Ratio of ton of CO₂ emitted for each ton of soda ash produced.

(3) Site-specific emission factor method. Use Equations CC–3, CC–4, and CC–5 of this section to determine annual CO₂ process emissions from manufacturing lines that use the liquid alkaline feedstock process to produce soda ash. You must conduct an annual performance test and measure CO₂ emissions and flow rates at all process vents from the mine water stripper/evaporator for each manufacturing line and calculate CO₂ emissions as described in paragraphs (b)(3)(i) through (b)(3)(iv) of this section.

Where:

E_k = Annual CO₂ process emissions for each manufacturing line, k (metric tons).

EF_CO2 = CO₂ emission factor (metric tons CO₂/metric ton of process vent flow from mine water stripper/evaporator).

V_a = Annual process vent flow rate from mine water stripper/evaporator (thousand pounds/hour).

H = Annual operating hours for the each manufacturing line.

0.453 = Conversion factor (metric tons/thousand pounds).

(4) Calculate and report under subpart C of this part (General Stationary Fuel Combustion Sources) the combustion CO₂, CH₄, and N₂O emissions in the soda ash manufacturing line according to the applicable requirements in subpart C.