December 28, 2015
By:
Walter G. Wright
Category:
Arkansas Environmental, Energy, and Water Law
Arkansas Environmental, Energy, and Water Law
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Chuck Buttry, Regional Manager (Southeast), Trinity Consultants forwarded a December 22nd memorandum from the United States Environmental Protection Agency – Research Triangle Park, North Carolina (“EPA”) titled Model Clearinghouse Review of the Use of Ambient Ratio Method 2 (ARM2) Default AERMOD Option for Hankook Tires Facility NO2 Ambient Impact Analysis (“Memorandum”).
The EPA Memorandum was in response to a concurrence request from EPA Region 4 regarding the proposed use of the Ambient Ratio Method 2 technique for a facility in Clarksville, Tennessee.
Chuck summarized the December 22nd EPA Memorandum noting:
On December 22, the US EPA Model Clearinghouse concurred with EPA Region 4 regarding the use of the Ambient Ratio Method 2 (ARM2) technique for 1-hour modeling NO2 at the Hankook Tires facility in Clarksville, Tennessee. The ARM2 technique is a non-regulatory default option in the AERMOD model, and requires EPA Regional Office approval and concurrence from the Model Clearinghouse. The ARM2 technique is appropriate when modeling NOx emissions from sources with low NO2/NOX in-stack ratios and that are located in areas (usually rural) with relatively low ozone concentrations. As such, this technique should be considered when conducting NO2 modeling for many areas of Arkansas. Note that ARM2 has been included as an available AERMOD regulatory default in the proposed changes to the Guideline on Air Quality Models (Appendix W to Part 51). When and if the new Guideline is promulgated, use of ARM2 would not need any additional approval (as long as other recommended default settings were used).
Click here to download a copy of the Memorandum.
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