U.S. EPA Withdraws Direct Final Rule on Revisions to Procedure 2- Quality Assurance Requirements for PM CEMS
On February 15, 2017 the U.S. EPA withdrew its direct final rule published on November 21, 2016 (81 FR 83160). This rule would have revised Procedure 2 of the Quality Assurance Requirements for Particulate Matter Continuous Emission Monitoring Systems at Stationary Sources. The reason for this withdrawal, per EPA, was due to the receipt of an adverse comment. This change would have modified the procedure to allow facilities to extend their PM CEMS correlation regression line to the lowest PM CEMS response obtained during the annual response correlation audit (RCA) or annual relative response audit (RRA). The change would have ensured that facilities that had reduced their emissions since completing their correlation testing would have no longer been penalized because their lower emissions fell outside their initial response range.