Appendix V to Part 264 - Examples of Potentially Incompatible Waste
40:28.0.1.1.5.27.1.9.12 : Appendix V
Appendix V to Part 264 - Examples of Potentially Incompatible Waste
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 SO2 Cl2, SOCl2,
PCl3, CH3 SiCl3 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.
1 These include counties, city-county consolidations, and
independent cities. In the case of Alaska, the political
jurisdictions are election districts, and, in the case of Hawaii,
the political jurisdiction listed is the island of Hawaii.
[46 FR 2872, Jan. 12, 1981]