On November 20, the Homeland Security Department published the final Appendix A to its Chemical Facility Anti-Terrorism Standards. If a facility possesses a chemical listed in the appendix at or above the quantity noted, it must complete and submit to DHS a Top-Screen assessment by January 22. After that, DHS will determine which facilities present a high level of risk; those will have to conduct vulnerability assessments and implement a site security plan that meets DHS performance standards.
http://www.dhs.gov/journal/leadership/
