How will the permitted emissions be updated to reflect the newly exempt compounds?
The following process will be used: For existing permits that contain compound specific usage limits, the limits for newly exempt compounds will be deleted, and all limits for non-exempt pollutants will remain intact. For existing permits that contain a facility-wide ROC limit, the limit will remain unchanged. The source can emit emissions of any combination of ROCs up to the permitted limit. Emission limits for new and modified sources will be based on the new definition of ROC. • How will emission factors be adjusted to account for the newly exempt compounds? Of the compounds proposed for exemption, there are only two that will have any material effect on ROC emission limits: acetone and ethane. The calculation for acetone will be fairly straightforward because there is ample data on the amount of acetone in the various products that contain acetone. In essence, acetone will simply be deducted from the ROC emission estimates. For ethane, APCD staff will adjust the ROC emission limits
