On March 22, the Environmental Protection Agency quietly revised 40 CFR Part 355, with respect to how the threshold planning quantities (TPQs) should be derived for Extremely Hazardous Substances (EHSs) that are non-reactive solids in solution. Effective April 23, 2012, a facility should first multiply the weight of the solid EHS in solution by 0.2 and then compare that quantity to the lower published TPQ. Formerly, 100% of the weight of the solid in solution would be compared to the TPQ.
In a regulatory landscape littered with TPQs, RQs (reportable quantities), TRI Thresholds and Clean Air Act TQs (threshold quantities) applied to EHSs, CERCLA Hazardous Substances, Section 313 Toxic Chemicals and Section 112(r) Substances for Accidental Release Prevention among other chemical lists, what is the actual impact of this change? Where do we find regulatory relief?
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The threshold quantities are the lower of either 500 pounds or the threshold planning quantity for extremely hazardous substances, and 10,000 pounds for other hazardous substances (subject to certain exemptions that apply for hazardous wastes, tobacco, wood products, manufactured “articles,” food, drugs, cosmetics, alcohol and agricultural products, and higher thresholds for fuel storage at retail gas stations).