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Diesel Air Toxic Control Measure

Airborne Toxic Control Measures For Stationary Compression Ignition Engines

Facilities with stationary diesel engines classified as emergency equipment (generators, fire pumps and ski lift evacuation engines) are subject to California Air Resources Board (CARB) Stationary Compression Ignition Engine Airborne Toxic Control Measure (ATCM). In summary, the ATCM limits the engine’s annual run hours allowed for testing and maintenance, and imposes additional recordkeeping and reporting requirements.

The testing and maintenance hours are limited to between 20 and 40 hours per year, depending on the particulate matter (PM) emission level of the engine. Additional recordkeeping and reporting requirements include documentation of CARB certified diesel fuel purchased, or an alternative diesel fuel that meets the requirements of the CARB’s Verification Procedure. Additionally, information on the engine, installation details of the engine and emission factors is required.

The District’s Emergency Diesel Engine Questionnaire outlines the necessary information required to assist in the permit process. This information is required by July 1, 2005 for existing engines and needs to be submitted with an application for an Authority to Construct for new engines.

Prime Engines

All stationary diesel engines that are not classified as emergency engines are Prime Engines. The ATCM places stringent emission standards on in-use (existing, permitted) and new engines. New engines must meet the more stringent emission standard of 0.01 g/bhp-hr of PM emissions; or the Off-Road Compression Ignition (CI) Engine Certification Standard for an off-road engine of the same maximum rated power. In-use engines must be fitted with emission control strategies that reduce PM by 85% from baseline levels, or meet the 0.01 g/bhp-hr of PM emissions.

The compliance schedule for prime engines is based on the number of engines an operator has within the District, regardless of their locations and the age of those engines. All owners and operators of three or fewer engines shall meet the following schedule:

  • All pre-1989 through 1989 model year engines shall be in compliance by no later than January 1, 2006.

  • All 1990 through 1995 model year engines shall be in compliance by no later than January 1, 2007.

  • All 1996 and later model year engines shall be in compliance by no later than January 1, 2008.


All owners of four or more engines located within the District shall meet the following schedule:

Pre-1989 Through 1989 Model Year Engines

Percent of Engines

Compliance Date

50%

January 1, 2007

75%

January 1, 2008

100%

January 1, 2009

1990 Through 1995 Model Year Engines

Percent of Engines

Compliance Date

30%

January 1, 2007

60%

January 1, 2008

100%

January 1, 2009

1996 and Later Model Year Engines

Percent of Engines

Compliance Date

50%

January 1, 2008

100%

January 1, 2009

Each owner or operator of an in-use prime diesel engine shall identify, to the District, the control strategy that, when implemented, will meet the emission limits specified in the ATCM. This information shall be provided to the District no later than 180 days prior to the earliest applicable compliance date specified above.

The District’s Diesel Prime Engine Questionnaire outlines the necessary information required to assist in the permit process. This information is required by July 1, 2005 for existing engines and needs to be submitted with an application for an Authority to Construct for new engines.

This is a summary of the key elements of the ATCM. There are numerous other exceptions, exemptions, and conditions contained in the ATCM document. The full document is available on CARB’s website along with recent amendments, available as a PDF document.

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