After finishing this lesson, you will be able to describe the basic steps for collecting Continuous Emission Monitoring System (CEMS) data readings, troubleshooting probe and sample systems, changing calibration gas bottles, and entering new data in the engineering workstation (EWS). You will also be able to describe the process for performing weekly, monthly, quarterly, semi-annual, and annual preventive maintenance (PM) procedures. • Describe how to collect CEMS data readings • Describe basic steps required for troubleshooting probe and sample systems • Describe basic steps required to change calibration gas bottles and enter new data in the EWS • Identify tasks to be performed weekly, monthly, quarterly, semi-annually, and annually for PM