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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 Lower TPQ is that value. If there are two TPQs in the appendix, the Lower TPQ is the lesser of the two values, and it refers to the more dispersible or reactive forms of the substance [when the substance is a solid that exists in powdered form and has a particle size less than 100 microns; is handled in solution or in molten form; or meets the criteria for a National Fire Protection Association (NFPA) rating of 2, 3 or 4 for reactivity]. (E.g., the value "1,000" in a TPQ listing of 1,000/10,000). |