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## A5.3.1.1 Methodology 

Evaporative emissions from fuel storage tanks at airports can be estimated using FAA’s EDMS/AEDT or EPA’s TANKS program. Both models are based on the emission estimation procedures detailed in Chapter 7, Liquid Storage Tanks, of EPA's AP-42 28 . 

The general methodology for calculating storage tank evaporative emissions is expressed by Equation A5-9 ( Evaporative Emissions for Storage Tanks ). 

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## Equation A5-9. Evaporative Emissions for Storage Tanks 

The methodologies for calculating breathing emissions and working e missions is different for each tank type (e.g., fixed, horizontal, floating, etc.) and is dependent on data inputs, such as physical tank dimensions, fuel type being stored, meteorological data, fuel throughput, and other tank-specific characteristics that are further detailed in Chapter 7.1, Organic Liquid Storage Tanks 29 , of EPA’s AP-42. An overview of these data inputs and the likely sources of obtaining this information are given in Table A5-4 ( Data Inputs for Fuel Storage Tanks ). 

## Table A5-4. Data Inputs for Fuel Storage Tanks 

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