Oklahoma department of environmental quality

A full analysis must include the emissions of competing sources. G-P considered competing sources within the screening area. The screening area is unique for each pollutant, and is the area within a circle centered on the project with a radius equal to the significant impact distance plus 50 km, but not to exceed 100 km. The screening areas for NO₂, PM₁₀, and SO₂, are 55, 52.5 and 58 km, respectively. Table D-15 presents a summary of competing sources within 60 km of the Mill provided by ODEQ.

G-P included all competing sources within 60 km in the NAAQS modeling analysis. Table D-16 presents the individual stack parameters for sources at these facilities. In cases of missing stack parameters in the data, the following assumptions were made.

For point sources, stack temperature set to ambient (293 K), stack diameter set to 0.001 m, exit velocity set to 0.001 m/s, and stack height set to 10 feet.

For fugitive sources, release height set to 10 meters, vertical extent set to 10 m, initial vertical dispersion coefficient (_z) of m, lateral extent set to 5 m, and initial lateral dispersion coefficient (_y) set to 1.16 m or based on footprint of source area.

Table D-17 presents UTM locations and estimated base elevation from an AERMAP analysis.