Hawaii Administrative Rules › Title 11 - DEPARTMENT OF HEALTH › Subtitle 1 - GENERAL DEPARTMENTAL PROVISIONS › Chapter 264 - HAZADOUS WASTE MANAGEMENT STANDARDS FOR OWNERS AND OPERATERS OF HAZADOUS WASTE TREATMENT, STORAGE, AND DISPOSAL FACILITIES › Appendix V to Part 264 - Examples of Potentially Incompatible Waste

Current through June, 2024
Many hazardous wastes, when mixed with other waste or
				  materials at a hazardous waste facility, can produce effects which are harmful
				  to human health and the environment, such as (1) heat or pressure, (2) fire or
				  explosion, (3) violent reaction, (4) toxic dusts, mists, fumes, or gases, or
				  (5) flammable fumes or gases.
Below are examples of potentially incompatible wastes, waste
				  components, and materials, along with the harmful consequences which result
				  from mixing materials in one group with materials in another group. The list is
				  intended as a guide to owners or operators of treatment, storage, and disposal
				  facilities, and to enforcement and permit granting officials, to indicate the
				  need for special precautions when managing these potentially incompatible waste
				  materials or components.
This list is not intended to be exhaustive. An owner or
				  operator must, as the regulations require, adequately analyze his wastes so
				  that he can avoid creating uncontrolled substances or reactions of the type
				  listed below, whether they are listed below or not.
It is possible for potentially incompatible wastes to be
				  mixed in a way that precludes a reaction (e.g., adding acid to water rather
				  than water to acid) or that neutralizes them (e.g., a strong acid mixed with a
				  strong base), or that controls substances produced (e.g., by generating
				  flammable gases in a closed tank equipped so that ignition cannot occur, and
				  burning the gases in an incinerator).
In the lists below, the mixing of a Group A material with a
				  Group B material may have the potential consequence as noted.
Group 1-A
Acetylene sludge
Alkaline caustic liquids
Alkaline cleaner
Alkaline corrosive liquids
Alkaline corrosive battery fluid
Caustic wastewater
Lime sludge and other corrosive alkalies
Lime wastewater
Lime and water
Spent caustic
Group 1-B
Acid sludge
Acid and water
Battery acid
Chemical cleaners
Electrolyte, acid
Etching acid liquid or solvent
Pickling liquor and other corrosive acids
Spent acid
Spent mixed acid
Spent sulfuric acid
Potential consequences: Heat generation; violent
				  reaction.
Group 2-A
Aluminum
Beryllium
Calcium
Lithium
Magnesium
Potassium
Sodium
Zinc powder
Other reactive metals and metal hydrides
Group 2-B
Any waste in Group 1-A or 1-B
Potential consequences: Fire or explosion; generation of
				  flammable hydrogen gas
Group 3-A
Alcohols
Water
Group 3-B
Any concentrated waste in Groups 1-A or 1-B
Calcium
Lithium
Metal hydrides
Potassium
SO2Cl2,
				  SOCl2, PCl3,
				  CH3SiCl3
Other water-reactive waste
Potential consequences: Fire, explosion, or heat generation;
				  generation of flammable or toxic gases.
Group 4-A
Alcohols
Aldehydes
Halogenated hydrocarbons
Nitrated hydrocarbons
Unsaturated hydrocarbons
Other reactive organic compounds and solvents
Group 4-B
Concentrated Group 1-A or 1-B wastes Group
2-A wastes
Potential consequences: Fire, explosion, or violent
				  reaction.
Group 5-A
Spent cyanide and sulfide solutions
Group 5-B
Group 1-B wastes
Potential consequences: Generation of toxic hydrogen cyanide
				  or hydrogen sulfide gas.
Group 6-A
Chlorates
Chlorine
Chlorites
Chromic acid
Hypochlorites
Nitrates
Nitric acid, fuming
Perchlorates
Permanganates
Peroxides
Other strong oxidizers
Group 6-B
Acetic acid and other organic acids
Concentrated mineral acids
Group 2-A wastes
Group 4-A wastes
Other flammable and combustible wastes
Potential consequences: Fire, explosion, or violent
				  reaction.
Source: "Law, Regulations, and Guidelines for Handling of
				  Hazardous Waste." California Department of Health, February
				  1975.