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The minimum weight in pounds, as listed in 40 CFR 355 Appendix A and B, of an Extremely Hazardous Substance (EHS), which, if stored at a facility, requires notification under the Emergency Planning and Community Right-to-Know Act (EPCRA) Sections 302 and 303. If there is only one Threshold Planning Quantity (TPQ) in the appendix, the Upper TPQ is that value. If there are two TPQs in the appendix, the Upper TPQ is the greater of the two values, and it refers to the less dispersible and reactive forms of the substance [when the substance is a solid that does not exist in powdered form or does not have a particle size less than 100 microns; is not handled in solution or in molten form; and does not meet the criteria for a National Fire Protection Association (NFPA) rating of 2, 3 or 4 for reactivity] (E.g., the value "10,000" in a TPQ listing of 1,000/10,000.) |