40 CFR Part 265, Appendix V to Part 265 - Examples of Potentially Incompatible Waste

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View PDF at GPO Pt. 265, App. V
Appendix V to Part 265—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 can-not 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 Group 1-B
Acetylene sludge Acid sludge
Alkaline caustic liquids Acid and water
Alkaline cleaner Battery acid
Alkaline corrosive liquids Chemical cleaners
Alkaline corrosive battery fluid Electrolyte, acid
Caustic wastewater Etching acid liquid or solvent
Lime sludge and other corrosive alkalies
Lime wastewater Pickling liquor and other corrosive acids
Lime and water Spent acid
Spent caustic Spent mixed acid
Spent sulfuric acid
Potential consequences: Heat generation; violent reaction.
Group 2-A Group 2-B
Aluminum Any waste in Group 1-A or 1-B
Beryllium
Calcium
Lithium
Magnesium
Potassium
Sodium
Zinc powder
Other reactive metals and metal hydrides
Potential consequences: Fire or explosion; generation of flammable hydrogen gas.
Group 3-A Group 3-B
Alcohols Any concentrated waste in Groups 1-A or 1-B
Water 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 Group 4-B
Alcohols Concentrated Group 1-A or 1-B wastes
Aldehydes Group 2-A wastes
Halogenated hydrocarbons
Nitrated hydrocarbons
Unsaturated hydrocarbons
Other reactive organic compounds and solvents
Potential consequences: Fire, explosion, or violent reaction.
Group 5-A Group 5-B
Spent cyanide and sulfide solutions Group 1-B wastes
Potential consequences: Generation of toxic hydrogen cyanide or hydrogen sulfide gas.
Group 6-A Group 6-B
Chlorates Acetic acid and other organic acids
Chlorine Concentrated mineral acids
Chlorites Group 2-A wastes
Chromic acid Group 4-A wastes
Hyphochlorites Other flammable and combustible wastes
Nitrates
Nitric acid, fuming
Perchlorates
Permanganates
Peroxides
Other strong oxidizers
Potential consequences: Fire, explosion, or violent reaction.
Source: “Law, Regulations, and Guidelines for Handling of Hazardous Waste.” California Department of Health, February 1975.
[45 FR 33232, May 19, 1980, as amended at 71 FR 40276, July 14, 2006]

Title 40 published on 2013-07-01

The following are only the Rules published in the Federal Register after the published date of Title 40.

For a complete list of all Rules, Proposed Rules, and Notices view the Rulemaking tab.

  • 2014-02-07; vol. 79 # 26 - Friday, February 7, 2014
    1. 79 FR 7518 - Hazardous Waste Management System; Modification of the Hazardous Waste Manifest System; Electronic Manifests
      GPO FDSys XML | Text
      ENVIRONMENTAL PROTECTION AGENCY
      Final rule.
      This final rule is effective as a final agency action on August 6, 2014. However, the implementation and compliance date for these regulations will be delayed until such time as the e-Manifest system is shown to be ready for operation and the schedule of fees for manifest related services has been announced. EPA will publish a further document subsequent to this rule's effective date to announce the user fee schedule for manifest related activities. This document will also announce the date upon which compliance with this regulation will be required and upon which EPA will be ready to receive electronic manifests through the national e-Manifest system, in accordance with 40 CFR 3.2(a)(2).
      40 CFR Parts 260, 262, 263, 264, 265, and 271

Title 40 published on 2013-07-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 40 CFR 265 after this date.

  • 2014-02-07; vol. 79 # 26 - Friday, February 7, 2014
    1. 79 FR 7518 - Hazardous Waste Management System; Modification of the Hazardous Waste Manifest System; Electronic Manifests
      GPO FDSys XML | Text
      ENVIRONMENTAL PROTECTION AGENCY
      Final rule.
      This final rule is effective as a final agency action on August 6, 2014. However, the implementation and compliance date for these regulations will be delayed until such time as the e-Manifest system is shown to be ready for operation and the schedule of fees for manifest related services has been announced. EPA will publish a further document subsequent to this rule's effective date to announce the user fee schedule for manifest related activities. This document will also announce the date upon which compliance with this regulation will be required and upon which EPA will be ready to receive electronic manifests through the national e-Manifest system, in accordance with 40 CFR 3.2(a)(2).
      40 CFR Parts 260, 262, 263, 264, 265, and 271