A map showing the area in Navarro County, Texas where the Streetman Plant is shown as a smaller area outlined in blue, within the larger Navarro 2010 SO2 NAAQS nonattainment area outlined in red. A Data Requirements Rule monitor, the Richland Southeast 1220 Road monitor, is shown as a green triangle in the middle of the Streetman Plant area. The National Weather Service monitor used for surface meteorological data, located at the Corsicana Municipal Airport, is marked as a purple plus-sign north of the Navarro nonattainment area.