Monitoring System Requirements Timeline

For each . . . During this time frame . . . You must monitor VOC concentration by . . . Existing affected source Before 10/16/2017 Monitoring fermenter exhaust using a CEMS or by monitoring brew ethanol concentration using a brew ethanol monitor. Between 10/16/2017 and October 16, 2020 Monitoring fermenter exhaust using a VOC CEMS or by monitoring brew ethanol concentration using a brew ethanol monitor. On and after October 16, 2020 Monitoring fermenter exhaust using a VOC CEMS. New or reconstructed affected source that you start up prior to 10/16/2017 Before 10/16/2017 Monitoring fermenter exhaust using a CEMS or by monitoring brew ethanol concentration using a brew ethanol monitor. Between 10/16/2017 and October 16, 2020 Monitoring fermenter exhaust using a VOC CEMS or by monitoring brew ethanol concentration using a brew ethanol monitor. On and after October 16, 2020 Monitoring fermenter exhaust using a VOC CEMS. New or reconstructed affected source that you start up after 10/16/2017 After 10/16/2017 Monitoring fermenter exhaust using a VOC CEMS.