Development and Implementation. Each source owner or operator using a COM shall develop a written quality control (QC) program and submit that program to the Department for approval. A source owner or operator may periodically revise its QC program to make it more effective and efficient. Each revised QC program shall be resubmitted to the Department for approval, along with the prior approved program. A source owner or operator shall implement an approved QC program as expeditiously as possible. The owner or operator shall maintain a current copy of the approved QC program on site for inspection. Contents. At a minimum, each QC program shall include written procedures which describe in detail complete, step-by-step procedures and operations for each of the following activities: Opacity calibration; Calibration drift determination and adjustment; Daily, monthly, and quarterly checks of component or system performance; Preventive maintenance, including spare parts inventory; Data recording, calculations, and reporting; Performance audits and zero alignment procedures; Corrective actions for malfunctioning COMs; and Notification to the Department for the discovery of any out-of-control monitor.