Special Notice

This notice was published in the December 15, 2017, issue (Vol. 2017, No. 24) of the Utah State Bulletin.

Special Notice: Logan Moderate PM2.5 SIP NNSR Demonstration and Ammonia Sensitivity Analysis for the Logan Nonattainment Area

The Utah Division of Air Quality (DAQ) has committed, in a letter to the EPA, to address certain elements required of the State Implementation Plan submitted by DAQ for the Logan, UT-ID PM2.5 nonattainment area. Among these elements is a technical demonstration that ammonia need not be considered as a PM2.5 precursor for purposes of nonattainment new source review. In this demonstration, DAQ modeled the sensitivity of the air-shed to two hypothetical point sources of ammonia near the Federal Reference Method (FRM) monitor in Logan, Utah. The ammonia was added to gauge how sensitive PM2.5 concentrations in Cache Valley would be due to potentially large industrial sources that could begin future operations in the area. Currently, there are no planned or existing major sources in the Logan nonattainment area that encompasses Cache Valley. Cache Valley is highly ammonia rich due to the multitude of animal agricultural operations in the region.

DAQ is seeking public comment on this demonstration, which can be viewed at the following website https://deq.utah.gov/NewsNotices/notices/air/Pubrule.htm. The public comment period goes from 12/15/17 through 01/15/18.

Additional Information

The Portable Document Format (PDF) version of the Bulletin is the official version. The PDF version of this issue is available at https://rules.utah.gov/publicat/bull_pdf/2017/b20171215.pdf. The HTML edition of the Bulletin is a convenience copy. Any discrepancy between the PDF version and HTML version is resolved in favor of the PDF version.

For questions regarding this notice, please contact Mat Carlile, by phone at 801-536-4116, by FAX at 801-536-4136, or by Internet E-mail at [email protected]