4 The record articles

More Changes to Subpart ZZZZ

Posted: April 10th, 2011

Author: All4 Staff 

On March 9, 2011, U.S. EPA published direct final changes to 40 CFR Part 63, Subpart ZZZZ – National Emission Standards for Hazardous Air Pollutants for Reciprocating Internal Combustion Engines (RICE MACT) in the Federal Register. The changes to the rule were needed to correct minor typographical errors and to amend certain regulatory text to clarify compliance requirements related to continuous parameter monitoring systems (CPMS). Unless U.S. EPA received significant negative public comments by April 8, 2011, the changes will be effective without further notice on May 9, 2011. 

The direct final changes were deemed necessary after U.S. EPA received a large number of comments from facilities seeking clarifications on conflicting and/or confusing requirements. The published changes clarify whether certain prescribed averaging periods are determined on a 3-hour block or 4-hour rolling average, how “calibration checks” of temperature measurement devices such as thermocouples should be conducted and how often they should be conducted, and makes corrections to a number of tables and references to those tables in the text of the rule.


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