The VCAPCD issues Permits to Operate to facilities that have emergency standby diesel engines. These permits apply conditions to assure compliance with the California Air Toxic Control Measure (ATCM) for Stationary Diesel Engines and VCAPCD Rule 74.9, Stationary Internal Combustion Engines. Permit conditions set limits, based on the ATCM, for the annual hours of operation for maintenance and testing for each engine.
Companies with stationary emergency standby diesel engines are required to record each engine's hours of operation and maintain logs that differentiate operating hours for maintenance and testing from emergency use for each engine. Starting with the 2025 reporting data (submitted in 2026), the use of the annual reporting form has been discontinued. Engine emergency and non-emergency hours will be collected by the emission inventory team and during inspections.
Contact:
- If the engine has changed or the information needs to be updated, please contact the Engineering Division at 805-303-3688.