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 per Equation F-8 of this section.[GRAPHIC] [TIFF OMITTED] TR30OC09.033 Where: ECO2 = CO2 emissions from anode and/or paste
consumption, metric tons CO2.EFp = Prebake technology specific emission factor (1.6 metric
tons CO2/metric ton aluminum produced).MPp = Metal production from prebake process (metric tons Al).EFs = S[oslash]derberg technology specific emission factor
(1.7 metric tons CO2/metric ton Al produced).MPs = Metal production from S[oslash]derberg process (metric
tons Al).
(b) For other parameters, use the average of the two most recent data points after the missing data. [74 FR 56374, Oct. 30, 2009, as amended at 75 FR 79156, Dec. 17, 2010]