Emergency Planning and Notification; Emergency Planning and List of Extremely Hazardous Substances and Threshold Planning Quantities

USEPA is taking final action to revise the manner for applying threshold planning quantities (TPQ) for those extremely hazardous substances (EHS) that are non-reactive solid chemicals in solution. This revision allows facilities subject to the emergency planning requirements and which have a non-reactive solid EHS in solution, to first multiply the amount of the solid chemical in solution on-site by 0.2 before determining if this quantity equals or exceeds the lower published TPQ. This change is based on data, which showed less potential for non-reactive solid chemicals in solution to remain airborne and dispersed beyond a facility fence line in the event of an accidental release. Previously, EPA assumed 100% of non-reactive solid chemicals in solution could become airborne and dispersed beyond the fence-line in the event of an accidental release.

Authors: Environmental Protection Agency EPA ;Full Source: Federal Register 22 Mar 2012, 77(56), 16679-16688 (Eng) ;