Proposal Description
Washington State has regulated new emissions of toxic air pollutants (TAPs) since 1991 through the permitting process outlined in Chapter 173-460 WAC. Ecology last updated this rule in 2009 to reflect scientific knowledge current at that time. The primary goal of the current rulemaking is to update the rule to include new scientific information about the toxicity of various chemicals in the air.
The proposed amendments make the following changes:
• Update the list of toxic air pollutants.
• Recalculate:
o De minimis emission values.
o Small quantity emission rates (SQERs).
o Acceptable source impact levels (ASILs).
• Specify the number of significant digits of emissions rates (i.e., de minimis and SQERs) and concentrations (i.e., ASILs).
• Update language in the rule to use the acronym “TAP” instead of “toxic air pollutant.”
The comment period for this DNS corresponds with the comment period on the rulemaking to amend Chapter 173-460 WAC that ends on July 23, 2019.
Submit comments online to: http://ac.ecology.commentinput.com/?id=t7W9R
Location
Other identifying information: Statewide
Applicant
Washington State Department of Ecology