Appendix F, Procedure 1, 'Quality Assurance Requirements for Gaseous Continuous Emission Monitoring Systems Used for Compliance', of 40 CFR 60 requires that sources subject to Standards of Performance for New Stationary Sources, Subpart Da conduct certain quality assurance activities and submit a Data Assessment Report (DAR) on a quarterly basis to the applicable control agency. The subject project report presents a list of all electric utility steam generating units that are believed to be subject to Subpart Da. The list indicates the status of each unit (i.e., currently operating, under construction, or planned), and also provides source contact information. In addition, this report identifies the state agency contacts who are believed to be responsible for review of the DAR's. A list of EPA Regional Office contacts is also provided.