August 26, 2010

Restructuring of the Stationary Source Audit Program


On August 26, 2010, the U.S. Environmental Protection Agency (EPA) issued a final rule to restructure the stationary source audit program. The purpose of this program is to allow the use
of private audit samples for compliance tests to ensure that emissions tests accurately measure a facility’s emissions standards under Clean Air Act.

  • This action outlines minimum requirements for:
    1. Audit samples;
    2. Accredited audit sample providers, the private companies that prepare and distribute audit samples; and
    3. Third-party organizations that accredit and monitor the performance of the audit sample providers.
  • This action amends the General Provisions of Parts 51, 60, 61 and 63 and test methods 5I, 6, 6A-C, 7, 7A-D, 8, 15A, 16A, 18, 23, 25, 25C, 25D, 26, 26A, 104, 106, 108, 108A-C, 204A-F, 306, 306A, and 308. These amendments add language to the General Provisions that:
    • Allows accredited audit sample providers to supply the samples used for audits,
    • Requires emissions sources to obtain and use samples from these accredited audit sample providers instead of from EPA, as was the practice in the past;
    • Shifts audit requirements from EPA rules enumerating individual requirements for different test methodologies to the more generalized requirements contained in the General Provisions sections of Clean Air Act regulations.
  • The General Provisions establish general requirements for implementing the Standards of Performance for New Stationary Sources and the National Emissions Standards for Hazardous
    Air Pollutants. This action adds essential requirements for an audit sample to the General Provisions.
  • This action places the burden of obtaining an audit sample on the industrial emissions sources, rather than on the state and local air agencies responsible for assuring that sources
    are complying with Clean Air Act requirements.


  • Audit samples are one method used to ensure that emissions testing procedures meet EPA requirements. Audit samples are analyzed alongside samples collected in the field during
    compliance testing to evaluate objectively the quality of the data. The exact chemical composition of audit samples is known to the supplier, but not to the user. This precaution
    helps increase the integrity of the audit

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