EPA has posted on their website that mercury on filter Stationary Source Audit Samples (SSAS) are now available to quality assure mercury stack tests. This posting started the 60-day clock after which facilities conducting stack tests for mercury are required to purchase Stationary Source Audit Samples for mercury on filters; facilities conducting mercury compliance tests on and after December 26, 2015 will be required to comply and should plan accordingly.

Please visit the EPA website (http://www.epa.gov/ttn/emc/email.html#audit) for a complete list of available SSAS and for further information on the Audit Sample Program. This EPA page additionally includes a link to The NELAC Institute (TNI) Stationary Source Audit Sample Program (http://www.nelac-institute.org/ssas), currently the only EPA-approved Audit Sample Program.