Hawaii Administrative Rules › Title 11 - DEPARTMENT OF HEALTH › Subtitle 1 - GENERAL DEPARTMENTAL PROVISIONS › Chapter 453 - HAWAII EMERGENCY PLANNING AND COMMUNITY RIGHT-TO-KNOW ACT › Subchapter 4 - EMERGENCY PLANNING › Section 11-453-18 - Calculation of quantities for comparison with threshold planning quantities for solids and mixtures

Current through June, 2024
(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.