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Emissions Impact Assessment Guideline Preface

The attached Emissions Impact Assessment (EIA) guideline is provided to ensure Industry has access to current information requirements for adequately estimating the impact to ambient air from source emissions. Utah air quality regulation R307-401 establishes the application and permitting requirements for new installations and modifications to existing installations. R307-401-8(1)(b)(iv) identifies an EIA as a requirement for an Approval Order. There are instances where no EIA is required, and instances where the installation is not required to conduct an EIA, but for which the Division may perform an EIA in-house to estimate if emissions from the installation will be protective of the National Ambient Air Quality Standards (NAAQS). The specific requirements are addressed in the guideline. This guideline document provides a common basis for estimating the air quality concentrations used in assessing control strategies and developing emission limits. The guideline is expected to provide consistency and shorter review times in the EIA approval process.

This document is intended to be used in conjunction with the Notice of Intent Guide by sources seeking an Approval Order from the Utah Division of Air Quality. The DAQ will update this guidance as new standards are promulgated and as federal and state guidance is updated. For major PSD sources the state guidance will strictly adhere to federal guidance. For minor sources the DAQ has the flexibility to adopt standards tailored to Utah and its air quality program. The EIA guidance document will be reviewed at least annually by UDAQ staff. Information on the recent regulatory changes not reflected in this guidance document may be obtained by Emailing Jon Black (jlblack@utah.gov).

Meteorological Data

Disclaimer: Modeling protocols should be submitted, including met data that is intended to be used. You should choose the best met data for your modeling analysis, but final approval must be obtained from the UDAQ which considers proximity, period of record, and representativeness.

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