Section 11-453-18 - Calculation of quantities for comparison with threshold planning quantities for solids and mixtures(a) If a container of storage vessel holds a mixture or solution of an extremely hazardous substance, then the concentration of extremely hazardous substance, in weight per cent (greater than one per cent) , shall be multiplied by the mass (in pounds) in the vessel to determine the actual quantity of extremely hazardous substance therein. If the concentration of an extremely hazardous substance is less than or equal to one per cent in the mixture, you do not have to count that extremely hazardous substance.(b) You must aggregate (i.e., add together) the amounts of each extremely hazardous substance at your facility to determine if a threshold planning quantity is present. This means that, for a particular extremely hazardous substance, you must determine the total amount present at any one time at your facility by adding together the quantity of pure extremely hazardous substance and the quantity contained in all mixtures, regardless of location, number of containers, or method of storage. You do not have to count an extremely hazardous substance in a mixture if the concentration of that extremely hazardous-substance is less than or equal to one per cent.(c) Extremely hazardous substances that are solids are subject to either of two threshold planning quantities as shown in title 40 Code of Federal Regulations part 355, appendices A or B (e.g., lower threshold planning quantity/upper threshold planning quantity). The lower threshold planning quantity applies only if the solid exists in powdered form and has a particle size less than one hundred microns; or is handled in solution or in molten form; or meets the criteria for a National Fire Protection Association rating of two, three, or four for reactivity. If the solid does not meet any of these criteria, it is subject to the upper threshold planning quantity as shown in title 40 Code of Federal Regulations part 355, appendices A or B.(d) The one hundred micron level may be determined by multiplying the weight per cent of solid with a particle size less than one hundred microns in a particular container by the quantity of solid in the container.(e) The amount of solid in solution may be determined by multiplying the weight per cent of solid in the solution in a particular container by the quantity of solution in the container.(f) The amount of solid in molten form must be multiplied by 0.3 to determine whether the lower threshold planning quantity is met.(g) For purposes of this rule "mixture" means a heterogeneous association of substances where the various individual substances retain their identities and can usually be separated by mechanical means. Includes solutions or compounds but does not include alloys or amalgams.[Eff NOV 05 2010] (Auth: HRS § 128E-6) (Imp: HRS § 128E-6)