Procedures for estimating missing data.

  1. Law
  2. CFR 40
  3. Protection of Environment
  4. Environmental Protection Agency
  5. Air Programs
  6. Mandatory Greenhouse Gas Reporting
  7. Aluminum Production
  8. Procedures for estimating missing data.

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§ 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.

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

MPs = 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.

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


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