•Example:  California’s South Coast Air Quality Management District •Problem Identified:  Stationary engines subject to Rule 1110.2 met scheduled annual emission source tests but failed to meet unannounced spot emission tests •Result:  Excess emissions and AQMP (air quality management plan) not being met •Remedy:  Improve monitoring, recordkeeping and reporting.  Institute tighter emission limits. Affects all rich burn and lean burn stationary non-emergency engines (gas and diesel) in the Los Angeles area (SCAQMD)