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(b) You must aggregate (i.e., add together) the <br />amounts of each extremely hazardous substance at your <br />facility to determine if a threshold planning quantity <br />is present. This means that, for a particular <br />extremely hazardous substance, you must determine the <br />total amount present at any one time at your facility <br />by adding together the quantity of pure extremely <br />hazardous substance and the quantity contained in all <br />mixtures, regardless of location, number of <br />containers, or method of storage. You do not have to <br />count an extremely hazardous substance in a mixture if <br />the concentration of that extremely hazardous <br />substance is_less than or equal to one per cent. <br />(c) Extremely hazardous substances that are <br />solids are subject to either of two threshold <br />planning quantities as shown in title 40 Code of <br />Federal Regulations part 355, appendices A or B (e.g., <br />lower threshold planning quantity/upper threshold <br />planning quantity). The lower threshold planning <br />quantity applies only if the solid exists in powdered <br />form and has a particle size less than one hundred <br />microns; or is handled in solution or in molten form; <br />or meets the criteria for a National Fire Protection <br />Association rating of two, three, or four for <br />reactivity. If the solid does not meet any of these <br />criteria, it is Subject to the upper threshold <br />planning quantity as shown in title 40 Code of Federal <br />Regulations part 355, appendices A or B. <br />(d) The one hundred micron level may be <br />determined by multiplying the weight per cent of solid <br />with a particle size less than one hundred microns in <br />a particular container by the quantity of solid in the <br />container. <br />(e) The amount of solid in solution may be <br />determined by multiplying the weight per cent of solid <br />in the solution in a particular container by the <br />quantity of solution in the container. <br />(f) The amount of solid in molten form must be <br />multiplied by 0.3 to determine whether the lower <br />threshold planning quantity is met. <br />(g) For purposes of this rule "mixture" means a <br />heterogeneous association of substances where the <br />453-15 <br />