If the facility operates only 3 months per year, conduct a Method 9 during that time period. If the emission units do not operate during the remaining 9 months, a second Method 9 is not required. Municipal power plants sometimes start units up for a very short time to perform maintenance checks and operator training. Fire pumps and emergency generators are also occasionally started up for maintenance checks. Such startup is not considered operating time, if units are not used for generating power or pumping water. Therefore, Method 9 tests and qualitative assessments would not be required unless the emission unit operates.