How is the STQ for theft/diversion-EXP/IEDP chemicals calculated in a mixture?
For more information on this topic, please reference page 12 of 41 in the Final Rule, Appendix to Chemical Facility Anti-Terrorism Standards (http://www.dhs.gov/xlibrary/assets/chemsec_appendixafinalrule.pdf) on the DHS Critical Infrastructure: Chemical Security website. Referenced Text: As provided in § 27.204(b)(3), a facility shall count toward the STQ the total quantity of all commercial grades of a theft/diversion-EXP/IEDP chemical at the facility unless a specific minimum concentration is assigned in the Minimum Concentration column of Appendix A to part 27, in which case the facility should count the total quantity of all commercial grades of the chemicals at or above the specified minimum concentration. There are specified minimum concentrations for a few of the theft/diversion-EXP/IEDP chemicals, such as hydrogen peroxide (35%) or ammonium nitrate (nitrogen concentration of 23% nitrogen or greater). DHS has added a definition of “A Commercial Grade” (ACG) to § 27.105. ACG refe
