40 C.F.R. § 98.65

Current through October 31, 2024

Section 98.65 - Procedures for estimating missing data

A complete record of all measured parameters used in the GHG emissions calculations is required. Therefore, whenever a quality-assured value of a required parameter is unavailable (e.g., if a meter malfunctions during unit operation or if a required sample measurement is not taken), a substitute data value for the missing parameter shall be used in the calculations, according to the following requirements:

(a) Where anode or paste consumption data are missing, CO₂ emissions can be estimated from aluminum production by using Equation F-9 of this section.

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Where:

ECO₂ = CO₂ emissions from anode and/or paste consumption, metric tons CO₂.

EF_p = Prebake technology specific emission factor (1.6 metric tons CO₂/metric ton aluminum produced).

MP_p = Metal production from prebake process (metric tons Al).

EF_s = Søderberg technology specific emission factor (1.7 metric tons CO₂/metric ton Al produced).

MP_s = Metal production from Søderberg process (metric tons Al).

(b) For other parameters, use the average of the two most recent data points after the missing data.

40 C.F.R. §98.65

74 FR 56374 , Oct. 30, 2009, as amended at 75 FR 79156 , Dec. 17, 2010; 81 FR 89253 , Dec. 9, 2016

81 FR 89253 , 1/1/2018