Oklahoma department of environmental quality
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- Table D-21 Averaging Period Year Maximum Predicted Impact (g/m 3 )
- Significant Impact Level (g/m 3 ) Monitoring De minimis Conc., (g/m 3 )
- Table D-22 Averaging Period Year Maximum Predicted Impact (g/m 3 )
- Table D-23 Averaging Period Year Maximum Predicted Impact (g/m 3 )
- Table D-24 Averaging Period Year Maximum Predicted Impact (g/m 3 )
- Table D-25 Pollutant
- Table D-26 Year
- Table D-27 Concentrations in g/m 3 Averaging Period
- Table D-28 Averaging Period Year
- (YYMMDDHH) East (m) North (m)
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D.2.9 SOURCE IMPACT ANALYSIS RESULTS Significant Impact Analysis Carbon Monoxide By modeling the emissions that would result from the project, G-P determined that the proposed project will not have a significant CO impact. Table D-21 presents the maximum predicted impacts from the significant impact analysis.
The maximum 8-hour CO impact due to the project is below the SIL and monitoring de minimis concentrations. In addition, the maximum 1-hour impact value is also below the modeling significance level for that averaging period. Therefore, G-P did not perform a full NAAQS analysis for CO. Nitrogen Dioxide By modeling the emissions that would result from the project, G-P determined that the proposed project will have a significant NO2 impact out to approximately 4.5 km from the Mill. Table D-22 presents the maximum predicted impacts from the significant impact analysis.
The maximum annual NO2 impact due to the project is above the SIL but below the monitoring de minimis concentration of 1 and 14 g/m3, respectively. Therefore, G-P performed a full NAAQS analysis for NO2. Sulfur Dioxide By modeling the emissions that would result from the project, G-P determined that the project will have a significant SO2 impact out to 5.25 km. Table D-23 presents the maximum predicted impacts from the significant impact analysis.
The maximum 24-hour SO2 impact due to the proposed project is 5.3 g/m3, which is above the SIL but below the monitoring de minimis concentrations of 5 and 13 g/m3, respectively. The maximum 3-hour and annual average impacts are below the respective modeling significance levels. Therefore, G-P performed a full NAAQS analysis for SO2. Particulate Matter By modeling the emissions that would result from the project, G-P determined that the project will have a significant PM10 impact out to 2.1 km. Table D-24 presents the maximum predicted impacts from the significant impact analysis.
The maximum 24-hour PM10 impact due to the project is above the SIL but below the monitoring de minimis concentrations of 5 and 10 g/m3, respectively. In addition, the maximum annual impact also slightly exceeds the modeling significance level. Therefore, G-P performed a full NAAQS analysis for PM10. Summary The significant impact analysis determined that the project emission increase would cause a maximum impact above the SILs and the EPA monitoring de minimis concentrations for several pollutants. Figures D-5, D-6, and D-7 in the application present the arrangement of the significant impact areas for these pollutants. Table D-25 summarizes the significant increment diameter (SID) for each pollutant and indicates if the project impact is above the de minimis monitoring concentration. Table D-25
NAAQS Analysis Nitrogen Dioxide By modeling the total potential Mill emissions and competing source emissions, the analysis predicted the total impact to compare to the NAAQS. Table D-26 summarizes the NO2 model results. Table D-26
(a) maximum impact of two model runs with and without American Foundry Group G-P added a background concentration of 10.2 g/m3 to the modeling result. As summarized in Table D-27, when adding the background concentrations, the annual concentration is 40.1 g/m3. This impact is less than the respective NAAQS of 100 g/m3. Therefore, G-P has demonstrated that the Mill emissions that reflect all project changes will not cause or contribute to a violation of the NAAQS.
Sulfur Dioxide By modeling the total potential Mill emissions and competing source emissions, G-P determined that the maximum SO2 predicted impacts are 4,915, 133, and 14.5 μg/m3, for the 3-hour, 24-hour and annual averaging times, respectively. The maximum impact locations were in an area that did not require additional refined receptor grids. Table D-28 summarizes the SO2 model results.
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