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Tanks 4.09D


NOTE for facilities that operate organic liquids storage tanks and use the TANKS 4.09D software to quantify emissions. In November 2019, the U.S. EPA published revisions to AP-42 Chapter 7, Section 7.1. TANKS 4.09D will not be updated to include these changes. As a result, facilities will be required to use the updated equations in Chapter 7.1 to determine emissions from storage tank operations in lieu of TANKS 4.09D. Since the update was published in November of 2019, the Department is allowing facilities to report emissions from storage tanks using TANKS 4.09D for the 2019 reporting year. Starting with the reporting year 2020, facilities will be required to use Chapter 7.1 as updated in November 2019.