November 21, 2013. Under the Clean Air Act, Section 112(r), the EPA established a program requiring facilities possessing greater than certain threshold quantities of 140 chemicals to provide risk management plans to the EPA. As part of this reporting requirement, EPA requires facilities to determine the worst-case scenario release from a single chemical process, using EPA criteria and guidelines. Facilities also must estimate the population potentially at risk from this worst-case scenario chemical release by calculating the population that resides within a circle surrounding the facility. The radius of this circle represents the distance the worst-case scenario chemical release might travel. See this memo for more information. To learn more, contact Goosmann Law at info@goosmannlaw.com or call 712.226.4000.