How is the STQ calculated for Ammonium nitrate as a solid with a nitrogen concentration of 23% or greater if it is in a mixture?
For more information on this topic, please reference page 13 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: Given the circumstances surrounding its use (i.e., extensive use in the agricultural industry), DHS has set the STQ for this form of AN at 2,000 pounds. (This form of AN in a mixture will count toward the STQ in a minimum concentration of 33% or more.) And, per ยง 27.203(c), in calculating this theft STQ, facilities need only count amounts in transportation packagings.
