Hazardous Waste Characteristics 

A User-Friendly Reference Document 

October 2009 

 1
Table of Contents 

Introduction..................................................................................................................................... 3 

Overview of the Hazardous Waste Identification Process .......................................................... 5 

Characteristic Hazardous Wastes................................................................................................ 5 

Summary Chart............................................................................................................................ 7 

General Hazardous Waste Resources.......................................................................................... 8 

Regulations for the Identification of Hazardous Waste............................................................... 9 

General Resources for Hazardous Waste Characteristics.......................................................... 12 

Ignitability..................................................................................................................................... 12 

Regulations for Ignitable Liquids.............................................................................................. 13 

Regulations for Ignitable Solids................................................................................................ 14 

Regulations for Ignitable Compressed Gas............................................................................... 14 

Related Resources for Ignitable Compressed Gas..................................................................... 15 

Regulations for Oxidizers.......................................................................................................... 15 

Regulations for the Hazardous Waste Number for Ignitability................................................. 16 

General Resources for the Ignitability Characteristic................................................................ 17 

Corrosivity .................................................................................................................................... 18 

Regulations for Aqueous Solutions........................................................................................... 18 

Regulations for Steel Corrosivity .............................................................................................. 19 

Regulations for the Hazardous Waste Number for Corrosivity ................................................ 19 

General Resources for the Corrosivity Characteristic ............................................................... 20 

Reactivity ...................................................................................................................................... 20 

Regulations for Reactivity......................................................................................................... 20 

Regulations for Reactivity with Water...................................................................................... 21 

Regulations for Cyanide/Sulfide Reactivity.............................................................................. 21 

Regulations for Explosives........................................................................................................ 21 

Regulations for the Hazardous Waste Number for Reactivity .................................................. 22

 General Resources for the Reactivity Characteristic .................................................24

Toxicity......................................................................................................................................... 24 

Regulations for Toxicity............................................................................................................ 24 

General Resources for the Toxicity Characteristic.................................................................... 26 

 2
Introduction 

 

This document describes the Environmental Protection Agency’s (EPA’s) hazardous 

waste characteristics regulations under the authority of the Resource Conservation and Recovery 

Act (RCRA) Subtitle C1

 and includes hyperlinks to information that EPA has generated over the 

years to explain the characteristics regulations. The objective of this document is to consolidate 

the information on characteristics regulations to assist Environmental Protection Agency (EPA) 

staff, state staff, industrial facilities that generate and manage hazardous wastes, and the public to 

understand the current RCRA hazardous waste characteristics regulations. The criteria for 

identifying the characteristics of hazardous wastes are located in Title 40 of the Code of Federal 

Regulations (CFR) at Part 261. Please note that this reference document is designed to be webbased, so the usefulness of the document is maximized when it is viewed on a computer that is 

connected to the internet. 

This document is only a reference document and is not to be used as a substitute for the 

CFR itself or the requirements contained in the CFR. This document is also not a rulemaking in 

any way. Additionally, this reference document presents only the federal requirements for 

hazardous waste characteristics. Most states are authorized to manage their hazardous waste 

management regulatory program. Therefore, states may have their own set of regulations that 

apply in lieu of federal regulations, and while most state hazardous waste regulations are based 

on the federal requirements, some states have developed regulations that are more stringent than 

the federal program. We direct you to the following website to determine if the state regulatory 

program is different from the federal program: http://www.epa.gov/epawaste/wyl/stateprograms.htm

This document is organized by hazardous waste characteristic (i.e., ignitable, corrosive, 

reactive and toxic), in a manner similar to the way the identification of hazardous waste 

regulations are presented in Title 40 of the Code of Federal Regulations (CFR) at Part 261. 

Therefore, following an overview of the hazardous waste characteristics regulations, this 

document will present the definition of hazardous waste, criteria for identifying hazardous waste, 

and the definitions of each of the four characteristics of hazardous waste. Background 

information and relevant resources are also provided throughout this document. 

To help stakeholders better understand specific requirements, we also have provided, 

where applicable, hyperlinks to Federal Register notices, frequently asked questions (FAQs), 

letters, and memoranda issued by EPA, as well as guidance and other relevant documents 

developed by EPA that provide further clarification of the hazardous waste characteristic 

regulations. We have attempted to identify the relevant related FAQs, letters, memoranda, etc. 

on a particular subject (miscellaneous resources can also be found in this document). However, 

please note that it is possible that EPA could have inadvertently overlooked a relevant document 

and did not include it in this reference document. Therefore, we cannot guarantee that we 

captured every relevant document in each and every instance. Additionally, once a user has 

navigated to the characteristics regulation of interest, we have provided hyperlinks to the e-CFR

website when the characteristics regulations cross-reference themselves or other regulations. 

 

1

 Subtitle C of RCRA has been codified in the United States Code (U.S.C.) as the Solid Waste Disposal Act 

(SDWA), Subchapter III (Hazardous Waste Management), 42 U.S.C. §§ 6921 through 6939e 

 3
Because regulations are promulgated throughout the year, EPA intends to update this 

reference document periodically to remain up-to-date with the hazardous waste regulatory 

requirements. However, as noted previously, this web-based reference document is not a 

substitute for the CFR itself or the requirements in the CFR. Additionally, the Government 

Printing Office frequently updates the e-CFR website to which the document is linked. The 

hyperlinks included in this document for Federal Register notices published prior to October 

1994 are from HeinOnline and are only available only by subscription to HeinOnline. By 

including this material, EPA does not endorse HeinOnline. 

 This reference document assumes that a solid waste has been generated. Therefore, we 

have not included the applicable regulatory citations for determining if a solid waste (See 40 

CFR 261.2) has been generated. Similarly, we have not included the regulatory citations for 

specific exclusions from either the definition of solid waste and definition of hazardous waste 

found in 40 CFR 261.4, or the requirements for recyclable materials found in 40 CFR 261.6. 

Similar documents have been prepared compiling regulations applicable to generators of 

hazardous waste, “Hazardous Waste Generator Regulations: A User-Friendly Reference 

Document, May 2007,” and the hazardous waste listings regulations, “Hazardous Waste Listings:

A User-Friendly Reference Document, Draft, March 2008.” Documents for Exclusions from the 

Definition of Solid Waste have also been developed, “Definition of Solid Waste Compendium -

Volume A: Exclusions” and “Identification and Listing of Hazardous Waste 40 CFR § 261.4(b): 

Exclusions: Solid Wastes Which are not Hazardous Wastes.” A collection of written materials 

about specific issues related to the definition of solid waste is available, “DSW Compendium.” 

This document was developed by the Materials Recovery and Waste Management Division in 

the Office of Resource Conservation and Recovery (formerly Office of Solid Waste). (Name 

change effective as per 74 FR 30228, June 25, 2009). Please direct any questions concerning 

this document to: helms.greg@epa.gov.

How to navigate this document 

This document is navigable in several ways. First, generators can use the Summary 

Table to link directly to the regulatory citation of interest in the Government Printing Office’s 

Electronic Code of Federal Register website (e-CFR) by left-clicking the mouse on 

the hyperlinks in the table. Clicking on the hyperlink will open the e-CFR in a new web-browser 

window, so the original document will also remain open. Secondly, users can take advantage of 

the Table of Contents (page 2 of the document) or the bookmarks (located on the left-hand side 

of the screen) to navigate through the body of the document. The Table of Contents and 

bookmarks are organized by hazardous waste characteristic. Users can navigate the document by 

clicking the left side of the mouse on the link of interest in the Table of Contents and bookmarks. 

 4
Overview of the Hazardous Waste Identification Process 

EPA's regulations establish two ways of identifying solid wastes as hazardous under the 

Resource Conservation and Recovery Act RCRA. A waste may be considered hazardous if it 

exhibits certain hazardous properties (“characteristics”) or if it is included on a specific list of 

wastes EPA has determined are hazardous (“listing” a waste as hazardous) because we found 

them to pose substantial present or potential hazards to human health or the environment. EPA's 

regulations in the Code of Federal Regulations (40 CFR) define four hazardous waste 

characteristic properties: ignitability, corrosivity, reactivity, or toxicity (see 40 CFR 261.21-

261.24). This document presents the regulations that will assist in identifying the characteristics 

of hazardous waste in §§ 261.31 through 261.33. Since EPA has developed a separate document 

for listed wastes, only characteristic wastes will be discussed in this document. 

Characteristic Hazardous Wastes 

A RCRA characteristic hazardous waste is a solid waste that exhibits at least one of four 

characteristics defined in 40 CFR Part 261 subpart C — ignitability (D001), corrosivity (D002), 

reactivity (D003), and toxicity (D004 - D043). 

• Ignitability– Ignitable wastes can create fires under certain conditions, are spontaneously 

combustible, or have a flash point less than 60 °C (140 °F). Examples include waste oils 

and used solvents. For more details, see 40 CFR §261.21. Test methods that may be 

used to determine ignitability include the Pensky-Martens Closed-Cup Method for 

Determining Ignitability (Method 1010A)(PDF)(1 pg, 19K), the Setaflash Closed-Cup 

Method for Determining Ignitability (Method 1020B)(PDF) (1 pg, 17K), the Ignitability 

of Solids (Method 1030) (PDF)(13 pp, 116K), Test Method for Oxidizing Solids (Method 

1040)(PDF) (17 pp, 207K), and the Test Method to Determine Substances Likely to 

Spontaneously Combust (Method 1050) (PDF)(20 pp, 611K).

• Corrosivity – Corrosive wastes are acids or bases (pH less than or equal to 2, or greater 

than or equal to 12.5) and/or are capable of corroding metal containers, such as storage 

tanks, drums, and barrels. Battery acid is an example. For more details, see 40 CFR 

§261.22. The test method that may be used to determine the ability of a waste to corrode 

steel is the Corrosivity Towards Steel (Method 1110A)(PDF)(6 pp, 37K). To measure 

pH electrometrically, see Method 9040C (PDF)(5 pp, 25K). 

• Reactivity – Reactive wastes are unstable under "normal" conditions. They can cause 

explosions, undergo violent reactions, generate toxic fumes, gases, or vapors or explosive 

mixtures when heated, compressed, or mixed with water. Examples include lithiumsulfur batteries and explosives. For more details, see 40 CFR §261.23 . There are 

currently no test methods available. 

• Toxicity – Toxic wastes are harmful or fatal when ingested or absorbed (e.g., containing 

mercury, lead, etc.). When toxic wastes are land disposed, contaminated liquid may 

leach from the waste and pollute ground water. Toxicity is defined through a laboratory 

 5
procedure called the Toxicity Characteristic Leaching Procedure (TCLP) (Method 

1311)(PDF)(35 pp, 288K). The TCLP helps identify wastes likely to leach 

concentrations of contaminants that may be harmful to human health or the environment. 

For more details, see 40 CFR §261.24. 

 6
Summary Chart 

Links to specific sections of the CFR Citations for the Characteristics of 

Hazardous Waste 

Title Section 

Definition of Hazardous Waste - 40 CFR 261.3

General 

Criteria for Identifying Characteristics 

of Hazardous Waste 

40 CFR 261.10

Characteristics of Hazardous Waste - 

General 

40 CFR 261.20

Characteristics of Ignitability 40 CFR 261.21

Characteristics of Corrosivity 40 CFR 261.22

Characteristics of Reactivity 40 CFR 261.23

Toxicity Characteristic 40 CFR 261.24

Hazardous waste determination 40 CFR 262.11

 7
General Hazardous Waste Resources 

• Electronic Code of Federal Regulations 

e-CFR: Title 40-Protection of Environment (Parts 260-265)

• Hazardous waste web page on the EPA website 

http://www.epa.gov/epawaste/hazard/index.htm

• RCRA training modules 

http://www.epa.gov/osw/inforesources/pubs/hotline/rmods.htm

• Training Document on Hazardous Waste Identification 

http://www.epa.gov/waste/inforesources/pubs/training/hwid05.pdf

• General Questions on Hazardous Waste and Characteristics 

What is a RCRA hazardous waste?

• Requirements for Generators of Hazardous Waste 

http://www.epa.gov/epawaste/hazard/generation/index.htm

• Website for RCRA Frequent Questions Database 

http://waste.custhelp.com/cgi-bin/waste.cfg/php/enduser/std_alp.php

• Environmental Justice 

Addressing Environmental Justice Issues In RCRA Programs

• Methods for Determining Characteristics of Hazardous Waste, SW-846, Chapter 8

Important Federal Register Notices for Characteristic Hazardous Waste 

• Proposed Rule – Hazardous Waste Guidelines and Regulations 

43 FR 58946, December 18, 1978

• Final Rule and Interim Final Rule - Hazardous Waste Management System: General 

45 FR 33066, May 19, 1980

• Petroleum Refining Process Waste - Notice of Data Availability 

68 FR 59935, October 20, 2003

 8
Regulations for the Identification of Hazardous Waste 

This document is organized in a manner similar to the way the definition and identification of 

hazardous waste regulations are presented in Title 40 of the Code of Federal Regulations (CFR) 

at Part 261. 

Title 40: Protection of Environment 

 

PART 261 – Identification and Listing of Hazardous Waste

Subpart C 

§ 261.3 Definition of hazardous waste

A solid waste, as defined in §261.2, is a hazardous waste if: 

(i) It exhibits any of the characteristics of hazardous waste identified in subpart C of this part. 

However, any mixture of a waste from the extraction, beneficiation, and processing of ores and 

minerals excluded under §261.4(b)(7) and any other solid waste exhibiting a characteristic of 

hazardous waste under subpart C is a hazardous waste only if it exhibits a characteristic that 

would not have been exhibited by the excluded waste alone if such mixture had not occurred, or 

if it continues to exhibit any of the characteristics exhibited by the non-excluded wastes prior to 

mixture. Further, for the purposes of applying the Toxicity Characteristic to such mixtures, the 

mixture is also a hazardous waste if it exceeds the maximum concentration for any contaminant 

listed in Table 1 to §261.24 that would not have been exceeded by the excluded waste alone if 

the mixture had not occurred or if it continues to exceed the maximum concentration for any 

contaminant exceeded by the nonexempt waste prior to mixture. 

§ 261.3(a)(2)(i) 

(a) A solid waste, as defined in §261.2, is a hazardous waste if: 

(1) It is not excluded from regulation as a hazardous waste under §261.4(b); and 

 (2) It meets any of the following criteria: 

(i) It exhibits any of the characteristics of hazardous waste identified in subpart C of this part. 

However, any mixture of a waste from the extraction, beneficiation, and processing of ores and 

minerals excluded under §261.4(b)(7) and any other solid waste exhibiting a characteristic of 

hazardous waste under subpart C is a hazardous waste only if it exhibits a characteristic that 

would not have been exhibited by the excluded waste alone if such mixture had not occurred, or 

if it continues to exhibit any of the characteristics exhibited by the non-excluded wastes prior to 

mixture. Further, for the purposes of applying the Toxicity Characteristic to such mixtures, the 

mixture is also a hazardous waste if it exceeds the maximum concentration for any contaminant 

listed in table 1 to §261.24 that would not have been exceeded by the excluded waste alone if the 

 9
mixture had not occurred or if it continues to exceed the maximum concentration for any 

contaminant exceeded by the nonexempt waste prior to mixture. 

§ 261.3(b)(3)

(b) A solid waste which is not excluded from regulation under paragraph (a)(1) of this section 

becomes a hazardous waste when any of the following events occur: 

(1) In the case of a waste listed in subpart D of this part, when the waste first meets the listing 

description set forth in subpart D of this part. 

(2) In the case of a mixture of solid waste and one or more listed hazardous wastes, when a 

hazardous waste listed in subpart D is first added to the solid waste. 

(3) In the case of any other waste (including a waste mixture), when the waste exhibits any of the 

characteristics identified in subpart C of this part. 

 § 261.3(c)(1)

(c) Unless and until it meets the criteria of paragraph (d) of this section: 

(1) A hazardous waste will remain a hazardous waste. 

 § 261.3(d)(1)

(d) Any solid waste described in paragraph (c) of this section is not a hazardous waste if it meets 

the following criteria: 

(1) In the case of any solid waste, it does not exhibit any of the characteristics of hazardous 

waste identified in subpart C of this part. (However, wastes that exhibit a characteristic at the 

point of generation may still be subject to the requirements of part 268, even if they no longer 

exhibit a characteristic at the point of land disposal.) 

[57 FR 7632, Mar. 3, 1992; 57 FR 23063, June 1, 1992, as amended at 57 FR 37263, Aug. 18, 

1992; 57 FR 41611, Sept. 10, 1992; 57 FR 49279, Oct. 30, 1992; 59 FR 38545, July 28, 1994; 60 

FR 7848, Feb. 9, 1995; 63 FR 28637, May 26, 1998; 63 FR 42184, Aug. 6, 1998; 66 FR 27297, 

May 16, 2001; 66 FR 50333, Oct. 3, 2001; 70 FR 34561, June 14, 2005; 70 FR 57784, Oct. 4, 

2005; 71 FR 40258, July 14, 2006] 

§ 261.10 Criteria for identifying the characteristics of hazardous waste 

 (a) The Administrator shall identify and define a characteristic of hazardous waste in subpart C 

only upon determining that: 

(1) A solid waste that exhibits the characteristic may: 

 10
(i) Cause, or significantly contribute to, an increase in mortality or an increase in serious 

irreversible, or incapacitating reversible, illness; or 

(ii) Pose a substantial present or potential hazard to human health or the environment when it is 

improperly treated, stored, transported, disposed of or otherwise managed; and 

(2) The characteristic can be: 

(i) Measured by an available standardized test method which is reasonably within the capability 

of generators of solid waste or private sector laboratories that are available to serve generators of 

solid waste; or 

(ii) Reasonably detected by generators of solid waste through their knowledge of their waste. 

(b) [Reserved] 

PART 262 – Standards Applicable to Generators of Hazardous Waste

Subpart 

§ 262.11 Hazardous waste determination

A person who generates a solid waste, as defined in 40 CFR 261.2, must determine if that waste 

is a hazardous waste using the following method: 

(a) He should first determine if the waste is excluded from regulation under 40 CFR 261.4. 

(b) He must then determine if the waste is listed as a hazardous waste in subpart D of 40 CFR 

part 261. 

Note: Even if the waste is listed, the generator still has an opportunity under 40 CFR 260.22 to 

demonstrate to the Administrator that the waste from his particular facility or operation is not a 

hazardous waste. 

(c) For purposes of compliance with 40 CFR part 268, or if the waste is not listed in subpart D of 

40 CFR part 261, the generator must then determine whether the waste is identified in subpart C 

of 40 CFR part 261 by either: 

(1) Testing the waste according to the methods set forth in subpart C of 40 CFR part 261, or 

according to an equivalent method approved by the Administrator under 40 CFR 260.21; or 

(2) Applying knowledge of the hazard characteristic of the waste in light of the materials or the 

processes used. 

 11
(d) If the waste is determined to be hazardous, the generator must refer to parts 261, 264, 265, 

266, 268, and 273 of this chapter for possible exclusions or restrictions pertaining to 

management of the specific waste. 

[45 FR 33142, May 19, 1980, as amended at 45 FR 76624, Nov. 19, 1980; 51 FR 40637, Nov. 7, 

1986; 55 FR 22684, June 1, 1990; 56 FR 3877, Jan. 31, 1991; 60 FR 25541, May 11, 1995] 

General Resources for Hazardous Waste Characteristics 

Representative Sampling

Appendix I to Part 261—Representative Sampling Methods

The methods and equipment used for sampling waste materials will vary with the form and 

consistency of the waste materials to be sampled. Samples collected using the sampling 

protocols listed below, for sampling waste with properties similar to the indicated materials, will 

be considered by the Agency to be representative of the waste. 

[45 FR 33119, May 19, 1980, as amended at 70 FR 34562, June 14, 2005] 

Sampling Plan

Test Methods for Evaluating Solid Waste, Physical/Chemical Methods (SW-846) - Sampling 

Plan 

Federal Register Notices 

• Final Rule and Interim Final Rule - Hazardous Waste Management System: General 

45 FR 33066, May 19, 1980

• Petroleum Refining Process Wastes - Notice of Data Availability 

68 FR 59935, October 20, 2003

Letters/Memoranda

• REGULATORY STATUS OF USED NICKEL CATALYST

• STATUS OF SPENT SILVER-BEARING PHOTOFIXER THAT IS RECLAIMED

• BIOSOLIDS

Ignitability 

The regulations for the hazardous characteristic of ignitability can be found at 40 CFR 261.21. 

 12
Regulations for Ignitable Liquids 

§ 261.21

 (a) A solid waste exhibits the characteristic of ignitability if a representative sample of the waste 

has any of the following properties:

(1) It is a liquid, other than an aqueous solution containing less than 24 percent alcohol by 

volume and has flash point less than 60 °C (140 °F), as determined by a Pensky-Martens Closed 

Cup Tester (incorporated by reference, see §260.11), or a Setaflash Closed Cup Tester, using the 

test method specified in ASTM Standard D 3278–78 (incorporated by reference, see §260.11). 

Letters/Memoranda 

• DETERMINATION OF THE IGNITABILITY CHARACTERISTIC

• USE OF PAINT FILTER LIQUIDS TEST TO DETERMINE FREE LIQUIDS IN A WASTE

• MIXTURES OF USED OIL AND CHARACTERISTIC HAZARDOUS WASTE

• USE OF ASTM METHOD D-56 IN IGNITABILITY DETERMINATIONS

• POSITION PAPER ON SPENT ABSORBENT MATERIALS

• DEFINING IGNITABLE LIQUIDS METHOD

• RESPONSE TO SPECIFIC QUESTIONS REGARDING HAZARDOUS WASTE IDENTIFICATION 

AND GENERATOR REGULATIONS

• ALCOHOL-CONTENT EXCLUSION FOR THE IGNITABILITY CHARACTERISTIC

• CLARIFICATION ON: MANIFEST DOCUMENT NUMBER; F003, F005, D001; WASTE DESTINED 

FOR RECYCLING; AND TREATMENT STANDARDS FOR CFC

• PRETREATMENT OF CHARACTERISTIC WASTES SUBJECT TO LAND DISPOSAL 

RESTRICTIONS

• AQUEOUS SOLUTION, IGNITABILITY DEFINED

• AQUEOUS WASTE AS IGNITABLE

• LIQUID WASTE, DEFINITION OF

• CLARIFICATION OF THE RECYCLED USED OIL MANAGEMENT STANDARDS AS THEY 

PERTAIN TO IGNITABLE USED OIL

• CLARIFICATION OF THE USED OIL REGULATIONS APPLICABLE TO MIXTURES OF USED OIL 

AND CHARACTERISTIC WASTE

• DEFINITION OF A LIQUID AS IT APPLIES TO IGNITABLE AND CORROSIVE WASTES; LIQUID 

AS IT APPLIES TO IGNITABLE OR CORROSIVE WASTES

 13
• IGNITABILITY OR CORROSIVITY TESTING-LIQUID AND AQUEOUS DEFINITION

• FLASH POINT TESTS AND THE IGNITABILITY CHARACTERISTIC

• DEFINITION OF AQUEOUS

Regulations for Ignitable Solids 

§ 261.21(a)

(2) It is not a liquid and is capable, under standard temperature and pressure, of causing fire 

through friction, absorption of moisture or spontaneous chemical changes and, when ignited, 

burns so vigorously and persistently that it creates a hazard. 

Letters/Memoranda 

• FLASH POINT TESTING OF A WASTE FIBROUS FILTER MATERIAL

• INDUSTRIAL WIPERS AND THE HAZARDOUS WASTE IDENTIFICATION RULE

• HOW IGNITABLE SOLIDS AND SOLVENT CONTAMINATED RAGS OR SHOP TOWELS FIT 

INTO D001 CHARACTERISTIC OF IGNITABILITY

• INTERPRETATION OF THE RCRA IGNITABILITY CHARACTERISTIC WITH REGARD TO 

ACETONE WIPES

• CHARACTERIZATION OF NITROCELLULOSE FILTER FABRIC WASTE

• REGULATORY STATUS OF METAL CASINGS CONTAINING SPENT POWDERED METALLIC 

OXIDE CATALYST

• DETERMINATION OF THE IGNITABILITY CHARACTERISTIC

• IGNITABLE SOLID DEFINITION APPLIED TO TITANIUM SWARF

• IGNITABILITY CHARACTERISTIC TESTING FOR SOLIDS

• CLARIFICATION OF THE CHARACTERISTIC OF IGNITABILITY AS IT PERTAINS TO SOLIDS 

VS. LIQUIDS

• IGNITABILITY CHARACTERISTIC, DEFINITION OF UNDER STANDARD TEMPERATURE AND 

PRESSURE

Regulations for Ignitable Compressed Gas 

§ 261.21(a)

(3) It is an ignitable compressed gas. 

 14
(i) The term “compressed gas” shall designate any material or mixture having in the container an 

absolute pressure exceeding 40 p.s.i. at 70 °F or, regardless of the pressure at 70 °F, having an 

absolute pressure exceeding 104 p.s.i. at 130 °F; or any liquid flammable material having a vapor 

pressure exceeding 40 p.s.i. absolute at 100 °F as determined by ASTM Test D–323. 

(ii) A compressed gas shall be characterized as ignitable if any one of the following occurs: 

(A) Either a mixture of 13 percent or less (by volume) with air forms a flammable mixture or the 

flammable range with air is wider than 12 percent regardless of the lower limit. These limits 

shall be determined at atmospheric temperature and pressure. The method of sampling and test 

procedure shall be acceptable to the Bureau of Explosives and approved by the director, Pipeline 

and Hazardous Materials Technology, U.S. Department of Transportation (see Note 2). 

(B) Using the Bureau of Explosives' Flame Projection Apparatus (see Note 1), the flame projects 

more than 18 inches beyond the ignition source with valve opened fully, or, the flame flashes 

back and burns at the valve with any degree of valve opening. 

(C) Using the Bureau of Explosives' Open Drum Apparatus (see Note 1), there is any significant 

propagation of flame away from the ignition source. 

(D) Using the Bureau of Explosives' Closed Drum Apparatus (see Note 1), there is any explosion 

of the vapor-air mixture in the drum. 

Letters/Memoranda 

• INCINERATORS THAT RECEIVE GASEOUS EMISSIONS, RCRA EXCLUSION, CAA APPLIES

Regulations for Oxidizers 

§ 261.21(a)

(4) It is an oxidizer. An oxidizer for the purpose of this subchapter is a substance such as a 

chlorate, permanganate, inorganic peroxide, or a nitrate, that yields oxygen readily to stimulate 

the combustion of organic matter (see Note 4). 

(i) An organic compound containing the bivalent -O-O- structure and which may be considered a 

derivative of hydrogen peroxide where one or more of the hydrogen atoms have been replaced 

by organic radicals must be classed as an organic peroxide unless: 

(A) The material meets the definition of a Class A explosive or a Class B explosive, as defined in 

§261.23(a)(8), in which case it must be classed as an explosive, 

(B) The material is forbidden to be offered for transportation according to 49 CFR 172.101

 and 49 CFR 173.21, 

 15
(C) It is determined that the predominant hazard of the material containing an organic peroxide is 

other than that of an organic peroxide, or 

(D) According to data on file with the Pipeline and Hazardous Materials Safety Administration 

in the U.S. Department of Transportation (see Note 3), it has been determined that the material 

does not present a hazard in transportation. 

Letters/Memoranda 

• APPLICABILITY OF HAZARDOUS WASTE CODES TO A CHEMICAL POLISHING SYSTEM

• RCRA APPLICABILITY TO POTASSIUM PERMANGANATE AND MANGANESE DISPOSAL

• NITRIC ACID WASTE CHARACTERIZATION

• REGULATORY STATUS OF METAL CASINGS CONTAINING SPENT POWDERED METALLIC 

OXIDE CATALYST

Regulations for the Hazardous Waste Number for Ignitability 

§ 261.21

(b) A solid waste that exhibits the characteristic of ignitability has the EPA Hazardous Waste 

Number of D001. 

Note 1: A description of the Bureau of Explosives' Flame Projection Apparatus, Open Drum 

Apparatus, Closed Drum Apparatus, and method of tests may be procured from the Bureau of 

Explosives. 

Note 2: As part of a U.S. Department of Transportation (DOT) reorganization, the Office of 

Hazardous Materials Technology (OHMT), which was the office listed in the 1980 publication of 

49 CFR 173.300 for the purposes of approving sampling and test procedures for a flammable 

gas, ceased operations on February 20, 2005. OHMT programs have moved to the Pipeline and 

Hazardous Materials Safety Administration (PHMSA) in the DOT. 

Note 3: As part of a U.S. Department of Transportation (DOT) reorganization, the Research and 

Special Programs Administration (RSPA), which was the office listed in the 1980 publication of 

49 CFR 173.151a for the purposes of determining that a material does not present a hazard in 

transport, ceased operations on February 20, 2005. RSPA programs have moved to the Pipeline 

and Hazardous Materials Safety Administration (PHMSA) in the DOT. 

Note 4: The DOT regulatory definition of an oxidizer was contained in §173.151 of 49 CFR, and 

the definition of an organic peroxide was contained in paragraph 173.151a. An organic peroxide 

is a type of oxidizer. 

 16
[45 FR 33119, May 19, 1980, as amended at 46 FR 35247, July 7, 1981; 55 FR 22684, June 1, 

1990; 70 FR 34561, June 14, 2005; 71 FR 40259, July 14, 2006] 

Letters/Memoranda 

• PRETREATMENT OF CHARACTERISTIC WASTES SUBJECT TO LAND DISPOSAL 

RESTRICTIONS

• REGULATORY REQUIREMENTS APPLICABLE TO TWO WASTE STREAMS THAT WOULD BE 

BILAYERED THROUGH PHASE SEPARATION AT A LICENSED TSDF

• SOLVENT-CONTAMINATED WASTEWATER FROM FRAGRANCE MANUFACTURE

• END-USERS OF CHLORDIMEFORM EXEMPTION

• MIXTURE OF METHANOL AND SOLID WASTE WHICH DOES NOT EXHIBIT ANY 

CHARACTERISTICS

General Resources for the Ignitability Characteristic 

• Background document for the Ignitability characteristic

Test Methods 

Test methods are not required by the Federal regulations to determine if a waste passes or 

fails the characteristic of ignitability according to the RCRA regulatory definition at 40 CFR 

261.21. To clarify, the test results of these methods cannot be used to directly classify a waste as 

a D001 hazardous waste, nor can the results be used by themselves to definitively classify a 

waste as non-hazardous. No specific test for defining ignitable solids or oxidizers is required by 

the RCRA regulations, and only a waste meeting the narrative regulatory definitions at 40 CFR 

261.21(a)(2) and/or 261.21(a)(4) is an ignitable hazardous waste because it is an ignitable solid 

and/or an oxidizer. However, these test methods were developed to specifically illustrate the 

ignitable and oxidizer properties of materials, including wastes, and their results provide relevant 

and useful information that may be applied to knowledge of a waste in determining whether a 

waste meets the 40 CFR 261.21(a) criteria. 

• SW-846 Test Method for Ignitability of Solids – Test Method 1030

• SW-846 Test Method for Oxidizing Solids – Test Method 1040

• SW-846 Test Method to Determine Substances Likely to Spontaneously Combust - Test 

Method 1050

• Test Methods for Evaluating Solid Waste, Physical/Chemical Methods (SW-846) – 

Sampling Plan

 17
Federal Register Notices 

• Proposed Rule – Hazardous Waste Guidelines and Regulations: 43 FR 58946, December 

18, 1978

• Final Rule - Land Disposal Restrictions for Third Third Scheduled Wastes 

55 FR 22520, June 1, 1990

• Proposed Rule – Hazardous Waste Management System; Testing and Monitoring 

Activities: 58 FR 46052, August 31, 1993

• Proposed Rule – Land Disposal Restrictions Phase IV: Treatment Standards for Wood 

Preserving Wastes, Exemptions from RCRA for Certain Processed Materials/Mineral 

Processing and Bevill Exclusion Issues and the Use of Hazardous Waste as Fill: 62 FR 

25997, May 12, 1997

• Proposed Rule – Hazardous Waste Management System; Testing and Monitoring 

Activities: 58 FR 46052, August 31, 1993

Corrosivity 

The regulations for the hazardous characteristic of corrosivity can be found at 40 CFR 261.22. 

Regulations for Aqueous Solutions 

§ 261.21

(a) A solid waste exhibits the characteristic of corrosivity if a representative sample of the waste 

has either of the following properties: 

(1) It is aqueous and has a pH less than or equal to 2 or greater than or equal to 12.5, as 

determined by a pH meter using Method 9040C in “Test Methods for Evaluating Solid 

Waste, Physical/Chemical Methods,” EPA Publication SW–846, as incorporated by 

reference in §260.11 of this chapter. 

Federal Register Notice

• Final Rule: Hazardous Waste Management System: Testing and Monitoring Activities 

(Evaluating Aqueousness) 60 FR 3089, January 13, 1995

Letters/Memoranda 

• INTERPRETATION OF "AQUEOUS" AS APPLIED TO THE CORROSIVITY CHARACTERISTIC

• “AQUEOUS” AS APPLIED TO THE CORROSIVITY CHARACTERISTIC

 18
• USE OF PAINT FILTER LIQUIDS TEST TO DETERMINE FREE LIQUIDS IN A WASTE

• CORROSIVE CHARACTERISTIC APPLIED TO LIQUID AND AQUEOUS WASTES

• IGNITABILITY OR CORROSIVITY TESTING-LIQUID AND AQUEOUS DEFINITION

• APPLICABILITY OF CORROSIVITY PH AND STEEL CORROSION TESTS

• DEFINITION OF A LIQUID AS IT APPLIES TO IGNITABLE AND CORROSIVE WASTES; LIQUID 

AS IT APPLIES TO IGNITABLE OR CORROSIVE WASTES

• PH MEASUREMENT ON PARTIAL SOLIDS

Regulations for Steel Corrosivity 

§ 261.22(a)

(2) It is a liquid and corrodes steel (SAE 1020) at a rate greater than 6.35 mm (0.250 inch) per 

year at a test temperature of 55 °C (130 °F) as determined by Method 1010A in “Test Methods 

for Evaluating Solid Waste, Physical/Chemical Methods,” EPA Publication SW–846, and as 

incorporated by reference in §260.11 of this chapter. 

Letters/Memoranda 

• SW-846 TEST METHODS

• AGITATE SAMPLES EVALUATED USING METHOD 1110

• SPENT PICKLE LIQUOR CORROSIVITY

Regulations for the Hazardous Waste Number for Corrosivity 

§ 261.22

(b) A solid waste that exhibits the characteristic of corrosivity has the EPA Hazardous Waste 

Number of D002. 

[45 FR 33119, May 19, 1980, as amended at 46 FR 35247, July 7, 1981; 55 FR 22684, June 1, 

1990; 58 FR 46049, Aug. 31, 1993; 70 FR 34561, June 14, 2005] 

Letters/Memoranda 

• CORROSIVITY CHARACTERISTIC AS IT APPLIES TO SOLIDS

• LAND DISPOSAL RESTRICTION INTERIM FINAL RULE

• PRECIPITATION WHICH IS CORROSIVE DUE TO CONTACT WITH EXEMPT WASTES (COAL 

GASIFICATION ASH)

 19
• NITRIC ACID WASTE CHARACTERIZATION

• ELEMENTARY NEUTRALIZATION UNITS GENERATING AND STORING NON-CORROSIVE 

HAZARDOUS WASTES

• POLLUTION CONTROL SLUDGE FROM TREATMENT OF MINING WASTE - EXCLUSION

• CEMENT KILN DUST WASTE

• BATTERIES, WASTE ELECTROLYTE FROM RECHARGEABLE NICKEL-CADMIUM

• BATTERIES, SCRAP METAL, AND PRECIOUS METALS

• FOOD PROCESSORS, IMPACT OF HAZARDOUS WASTE REGULATIONS ON

• LIQUID, FREE LIQUID, RELEASABLE LIQUID DEFINITIONS

• REGULATORY STATUS OF LABORATORY WASTEWATER

General Resources for the Corrosivity Characteristic 

• Background document for the Corrosivity Characteristic

• "Determination of Water in Waste Materials by Karl Fisher Titration." – Method 9000

• Test Methods for Evaluating Solid Waste, Physical/Chemical Methods (SW-846) -

Sampling Plan

• Determination of Water in Waste Materials by Quantitative Calcium Hydride Reaction; 

Method 9001 

• Corrosivity Definition of Aqueous

Reactivity 

The regulations for the hazardous characteristic of reactivity can be found at 40 CFR 261.23. 

Regulations for Reactivity 

§ 261.23

(a) A solid waste exhibits the characteristic of reactivity if a representative sample of the waste 

has any of the following properties: 

 20
(1) It is normally unstable and readily undergoes violent change without detonating. 

Regulations for Reactivity with Water 

§ 261.23(a)

(2) It reacts violently with water. 

(3) It forms potentially explosive mixtures with water. 

(4) When mixed with water, it generates toxic gases, vapors or fumes in a quantity sufficient to 

present a danger to human health or the environment. 

Letters/Memoranda

• CHEMICAL AGENTS GB, VX, AND HD AT MUNITIONS DISPOSAL FACILITY

• REGULATION AND DISPOSAL REQUIREMENTS FOR SODIUM AZIDE

Regulations for Cyanide/Sulfide Reactivity 

§ 261.23(a)

(5) It is a cyanide or sulfide bearing waste which, when exposed to pH conditions between 2 and 

12.5, can generate toxic gases, vapors or fumes in a quantity sufficient to present a danger to 

human health or the environment.

Letters/Memoranda 

• WITHDRAWAL OF CYANIDE AND SULFIDE GUIDANCE

• HAZARDOUS WASTE TESTING ISSUES

Regulations for Explosives 

§ 261.23(a)

(6) It is capable of detonation or explosive reaction if it is subjected to a strong initiating source 

or if heated under confinement. 

(7) It is readily capable of detonation or explosive decomposition or reaction at standard 

temperature and pressure. 

 21
(8) It is a forbidden explosive as defined in 49 CFR 173.51, or a Class A explosive as defined in 

49 CFR 173.53 or a Class B explosive as defined in 49 CFR 173.88. 

Letters/Memoranda 

• TRANSPORTATION AND DISPOSAL OF SHOCK SENSITIVE OR EXPLOSIVE MATERIALS

• DOT REGULATIONS REFERENCED IN THE RCRA REGULATIONS

• REGULATORY ISSUES PERTAINING TO WASTES CONTAMINATED WITH EXPLOSIVE 

RESIDUES

• REACTIVE WASTE - EXPLOSIVITY

Regulations for the Hazardous Waste Number for Reactivity 

§ 261.23

(b) A solid waste that exhibits the characteristic of reactivity has the EPA Hazardous Waste 

Number of D003. 

[45 FR 33119, May 19, 1980, as amended at 55 FR 22684, June 1, 1990] 

Letters/Memoranda 

Aerosols 

• BUBBLER CANISTERS CONTAINING PHOSPHOROUS OXYCHLORIDE ARE NOT WASTE 

WHEN RETURNED TO THE UNITED STATES FROM JAPAN FOR REGENERATION

• REGULATORY STATUS OF WASTE AEROSOL CANS

• CLARIFICATION OF REACTIVITY CHARACTERISTIC AS IT PERTAINS TO AEROSOL CANS

• REGULATORY STATUS OF USED RESIDENTIAL AND COMMERCIAL/INDUSTRIAL AEROSOL 

CANS

Ammunition 

• REGULATORY STATUS OF METAL CASINGS CONTAINING SPENT POWDERED METALLIC 

OXIDE CATALYST

• SMALL ARMS AMMUNITION REACTIVITY, OFF SPECIFICATION

• CLARIFICATION OF DISCARDED AMMUNITION OF 0.50 CALIBER

Batteries

 22
• REACTIVE CHARACTERISTICS OF DISCHARGED LI/SO2 BATTERIES

• REGULATORY STATUS OF SPENT/DISCARDED LITHIUM-SULFUR DIOXIDE BATTERIES

• WASTE CHARACTERIZATION: LITHIUM BATTERIES

• REGULATORY STATUS OF BATTERIES

Flameless Ration Heaters 

• CLASSIFICATION AND DISPOSAL OF UNUSED FLAMELESS RATION HEATERS

• APPLICABILITY OF RCRA TO DISPOSAL OF UNIFIED GROUP RATION - EXPRESS (UGR-E)

• STATUS OF WASTE HYDROGEN FREE RATION HEATERS (HRHs) 

Explosives 

• BLASTING CAPS AS REACTIVE WASTES

• DETONATING EXPLOSIVE WASTES

• DISCARDED CLASS C EXPLOSIVES

General 

• LEAKS, SPILLS, AND ILLEGAL DISCHARGES OF LISTED WASTES TO SURFACE WATERS, 

MIXTURE RULE APPLIED TO

• REGULATORY STATUS OF UNIT AND WASTE IF NONHAZARDOUS WASTE BECOMES 

REACTIVE WHEN DEWATERED

• RCRA HAZARDOUS WASTE DETERMINATION OF SPENT NUCLEAR REACTOR FUELS

• APPLICABILITY OF 40 CFR 261.5 TO K047

• DREDGE SEDIMENTS (See Note 5) 

Note 5: 

§261.4(g) Exclusions

 (g) Dredged material that is not a hazardous waste. Dredged material that is subject to the 

requirements of a permit that has been issued under 404 of the Federal Water Pollution Control 

Act (33 U.S.C.1344) or section 103 of the Marine Protection, Research, and Sanctuaries Act of 

1972 (33 U.S.C. 1413) is not a hazardous waste. For this paragraph (g), the following definitions 

apply: 

(1) The term dredged material has the same meaning as defined in 40 CFR 232.2; 

[45 FR 33119, May 19, 1980] 

 23
Federal Register Notice

• Military Munitions Rule

62 FR 6622, February 12, 1997

General Resources for the Reactivity Characteristic 

• Background document for the Reactivity characteristic

Toxicity 

The regulations for the hazardous characteristic of toxicity can be found at 40 CFR 261.24. 

Regulations for Toxicity 

§261.24

(a) A solid waste (except manufactured gas plant waste) exhibits the characteristic of toxicity if, 

using the Toxicity Characteristic Leaching Procedure, test Method 1311 in “Test Methods for 

Evaluating Solid Waste, Physical/Chemical Methods,” EPA Publication SW–846, as 

incorporated by reference in §260.11 of this chapter, the extract from a representative sample of 

the waste contains any of the contaminants listed in table 1 at the concentration equal to or 

greater than the respective value given in that table. Where the waste contains less than 0.5 

percent filterable solids, the waste itself, after filtering using the methodology outlined in 

Method 1311, is considered to be the extract for the purpose of this section. 

(b) A solid waste that exhibits the characteristic of toxicity has the EPA Hazardous Waste 

Number specified in Table 1 which corresponds to the toxic contaminant causing it to be 

hazardous. 

Table 1 —Maximum Concentration of Contaminants for the Toxicity Characteristic 

EPA HW No.1 Contaminant CAS No.2 Regulatory Level (mg/L) 

D004 Arsenic 7440–38–2 5.0 

D005 Barium 7440–39–3 100.0 

D018 Benzene 71–43–2 0.5 

D006 Cadmium 7440–43–9 1.0 

D019 Carbon tetrachloride 56–23–5 0.5 

D020 Chlordane 57–74–9 0.03 

D021 Chlorobenzene 108–90–7 100.0 

D022 Chloroform 67–66–3 6.0 

 24
D007 Chromium 7440–47–3 5.0 

D023 o-Cresol 95–48–7 4200.0 

D024 m-Cresol 108–39–4 4200.0 

D025 p-Cresol 106–44–5 4200.0 

D026 Cresol 4200.0 

D016 2,4-D 94–75–7 10.0 

D027 1,4-Dichlorobenzene 106–46–7 7.5 

D028 1,2-Dichloroethane 107–06–2 0.5 

D029 1,1-Dichloroethylene 75–35–4 0.7 

D030 2,4-Dinitrotoluene 121–14–2 30.13 

D012 Endrin 72–20–8 0.02 

D031 Heptachlor (and its epoxide) 76–44–8 0.008 

D032 Hexachlorobenzene 118–74–1 30.13 

D033 Hexachlorobutadiene 87–68–3 0.5 

D034 Hexachloroethane 67–72–1 3.0 

D008 Lead 7439–92–1 5.0 

D013 Lindane 58–89–9 0.4 

D009 Mercury 7439–97–6 0.2 

D014 Methoxychlor 72–43–5 10.0 

D035 Methyl ethyl ketone 78–93–3 200.0 

D036 Nitrobenzene 98–95–3 2.0 

D037 Pentrachlorophenol 87–86–5 100.0 

D038 Pyridine 110–86–1 35.0 

D010 Selenium 7782–49–2 1.0 

D011 Silver 7440–22–4 5.0 

D039 Tetrachloroethylene 127–18–4 0.7 

D015 Toxaphene 8001–35–2 0.5 

D040 Trichloroethylene 79–01–6 0.5 

D041 2,4,5-Trichlorophenol 95–95–4 400.0 

D042 2,4,6-Trichlorophenol 88–06–2 2.0 

 25
D017 2,4,5-TP (Silvex) 93–72–1 1.0 

D043 Vinyl chloride 75–01–4 0.2 

1

Hazardous waste number. 

2

Chemical abstracts service number. 

3

Quantitation limit is greater than the calculated regulatory level. The quantitation limit therefore 

becomes the regulatory level. 

4

If o-, m-, and p-Cresol concentrations cannot be differentiated, the total cresol (D026) 

concentration is used. The regulatory level of total cresol is 200 mg/l. 

[55 FR 11862, Mar. 29, 1990, as amended at 55 FR 22684, June 1, 1990; 55 FR 26987, June 29, 

1990; 58 FR 46049, Aug. 31, 1993; 67 FR 11254, Mar. 13, 2002; 71 FR 40259, July 14, 2006] 

General Resources for the Toxicity Characteristic 

• Methods for Determining Characteristics of Hazardous Waste, SW-846, Chapter 8 

Federal Register Notices

• Final Rule: Toxicity Characteristic 

55 FR 11829: March 29, 1,90

• Proposed Rule: Hazardous Waste Management System; Modification of the Hazardous 

Waste Recycling Regulatory Program 

58 FR 8102, February 11, 1993

• Request for Comment on Proposed Statement of Policy Regarding Spent Antifreeze 

63 FR 20187, April 23, 1998

Letters/Memoranda 

Antifreeze 

• USED AUTOMOBILE ANTIFREEZE DISPOSAL

• SPENT ANTI-FREEZE COOLANT REGULATORY STATUS

• SPENT ANTIFREEZE AND THE TOXICITY CHARACTERISTIC

Biosolids 

• BIOSOLIDS

Chromium/Trivalent Chromium 

• HAZARDOUS WASTE TESTING ISSUES

 26
• RULEMAKING PETITION FOR TRIVALENT CHROMIUM EXCLUSION

• PETITION PROCESS FOR THE TRIVALENT CHROMIUM EXCLUSION 

• TOTAL CHROMIUM ANALYSIS

Chromated Copper Arsenate (CCA) Treated Wood 

• CCA TREATED WOOD WHEN DISPOSED

• WOOD MULCH DERIVED FROM WASTE LUMBER PRESERVED WITH CHROMATED COPPER 

ARSENATE (CCA)

• RECOMMENDATION ON THE DISPOSAL OF WASTE LUMBER PRESERVED WITH 

CHROMATED COPPER ARSENATE (CCA)

• CURRENT STATUS OF CCA-TREATED WOOD UNDER RCRA

Explosive Waste/Military Munitions 

• APPLICABILITY OF THE TCLP TO WASTE MUNITIONS

• TCLP PARTICLE SIZE REDUCTION EXEMPTION FOR MUNITIONS

• COMBUSTION PROHIBITION AND EXPLOSIVE WASTES

Lead/Lead-Based Paint 

• LEADED PAINT SANDBLASTING WASTE TESTING USING TCLP

• TCLP AND LEAD PAINT REMOVAL DEBRIS

• LEAD PAINT REMOVAL DEBRIS AND THE TCLP PROCEDURE

• RCRA APPLICABILITY TO PAINT REMOVAL WASTES

• INCORPORATION OF PRETOX 2000 INTO LEADED PAINT STRIPPER

• RECYCLING OF MOLDING AND CASTING SANDS

• LEACH TESTING PROCEDURE TO REMOVE LEAD-CONTAMINATED SOILS FROM 

RESIDENTIAL AREAS

• MANAGEMENT AND DISPOSAL OF WASTE VINYL MINI BLINDS

• PROPOSED TSCA 403 SOIL LEAD HAZARD AND OSWER'S LEAD-IN-SOILS POLICY

Manufactured Gas Plant (MGP) 

• IMPLEMENTATION OF VACATURE OF TCLP USE FOR EVALUATING MANUFACTURED GAS 

PLANT (MGP) WASTES IN THE BATTERY RECYCLERS CASE

• MANUFACTURED GAS PLANT (MGP) REMEDIATION WASTE 

 27
Mercury/Mercury Lamps 

• MANAGEMENT OF USED FLUORESCENT LAMPS

• STATUS OF FLUORESCENT LAMPS UNDER RCRA

• DETERMINATION ON WHETHER A GENERATOR'S FLUORESCENT TUBES ARE 

NONHAZARDOUS

• MANAGEMENT OF USED FLUORESCENT LAMPS

• MERCURY DRY CELL BATTERIES AND APPLICABLE REGULATIONS

• WASTE IDENTIFICATION OF DISCARDED THERMOMETERS

Municipal Waste Combustion Ash 

• SAMPLING AND ANALYSIS OF MUNICIPAL REFUSE INCINERATOR ASH; Draft 05/15/1994 

• GUIDANCE FOR THE SAMPLING AND ANALYSIS OF MUNICIPAL WASTE COMBUSTION ASH 

FOR THE TOXICITY CHARACTERISTIC; June 1995 

• STATUS OF MUNICIPAL WASTE COMBUSTION ASH

• RESIDUES FROM MUNICIPAL WASTE RESOURCE RECOVERY FACILITIES; MUNICIPAL 

WASTE COMBUSTION RESIDUES-ASH AND SLUDGE

• MUNICIPAL WASTE COMBUSTION, DISPOSAL OF RESIDUAL ASH

Oily Waste/Used Oil 

• USED OIL FILTERS CLASSIFICATION

• TC RULE RELATIONSHIP TO USED OIL FILTER DISPOSAL

• APPLICABILITY OF THE TOXICITY CHARACTERISTIC TO USED OIL FILTERS

• TC RULE DELAY OF IMPOSITION ON OIL FILTERS

• TCLP EXTRACTIONS APPLIED TO LIQUID WASTES, OILS AND SOLVENT-BASED PRODUCTS

• TCLP EXTRACTIONS AS THEY APPLY TO OILY WASTE

• QUESTIONS ON FINAL USED OIL RULE

• DILUTION OF TEST SAMPLING

• USED OIL USED FOR DUST SUPPRESSION OR ROAD TREATMENT

• CLARIFICATION OF THE USED OIL REGULATIONS APPLICABLE TO MIXTURES OF USED OIL 

AND CHARACTERISTIC WASTE

 28
• REGULATORY REQUIREMENTS PERTAINING TO THE MANAGEMENT OF WASTE SOLVENTS 

AND USED OIL

Toxicity Characteristic Leaching Procedure (TCLP) 

• SAMPLE HOLDING TIMES AND VALIDITY OF ANALYTICAL RESULTS

• DILUTION OF TEST SAMPLING

• EXEMPTION FROM PARTICLE SIZE REDUCTION STEP IN TCLP

• MATRIX SPIKE IN TCLP PROCEDURE

• ANALYSIS OF FLUFF MATERIALS

• GENERATOR HAZARDOUS WASTE DETERMINATION AND THE TCLP

• APPLICABILITY OF THE TCLP

• APPLICABILITY OF THE TOXICITY CHARACTERISTIC AND THE TCLP

• BIAS CORRECTION APPLIED TO THE TCLP

• TC RULE HAZARDOUS WASTE DETERMINATION

• SEMI-VOLATILE CONSTITUENT ANALYSIS AND ANALYTICAL LEVEL OF DETECTION 

LIMITATIONS OF THE TOXICITY CHARACTERISTIC LEACHING PROCEDURE (TCLP)

• INTERPRETATION OF THE PHRASE ""WHICH CAN BE REASONABLY EXPECTED TO BE 

PRESENT"" FOR SOIL THAT EXHIBITS THE TOXICITY CHARACTERISTIC

• INAPPROPRIATE USE OF METHOD 1311 (TCLP) AS AN ALTERNATIVE EXTRACTION 

PROCEDURE

• REVISIONS TO THE TCLP

• SEMI-VOLATILE CONSTITUENT ANALYSIS AND ANALYTICAL LEVEL OF DETECTION 

LIMITATIONS OF THE TOXICITY CHARACTERISTIC LEACHING PROCEDURE (TCLP)

• ENVIRONMENTAL FACT SHEET: EPA REVISES QUALITY ASSURANCE MEASURES FOR THE 

TOXICITY CHARACTERISTIC LEACHING PROCEDURE

Use of Totals to Determine Whether a Solid Waste Exhibits the Toxicity Characteristic 

• USE OF TOTAL WASTE ANALYSIS IN TOXICITY CHARACTERISTIC DETERMINATIONS

• CALCULATION OF TCLP CONCENTRATIONS FROM TOTAL CONCENTRATIONS

• BIOSOLIDS

• TOTAL CONCENTRATION USED TO DEMONSTRATE A WASTE DOES NOT EXHIBIT THE 

CHARACTERISTIC OF EP TOXICITY

• GENERATOR USE OF TOTAL CONSTITUENT ANALYSIS IN LIEU OF THE EP OR TCLP TESTS

 29
• TOTAL CONSTITUENT ANALYSIS TO DETERMINE HAZARDOUS CHARACTERISTICS OF 

WASTE SAMPLE

• TOTAL WASTE ANALYSIS ON POTW BIOSOLIDS AND CERCLA LIABILITY

General Toxicity 

• RCRA HAZARDOUS WASTE DETERMINATION OF SPENT NUCLEAR REACTOR FUELS

• RESPONSE TO REQUEST FOR OPINION ON SECTION 21 PETITION ON BATTERY DEPOSITS

• NOTES ON RCRA METHODS AND QA ACTIVITIES

• QC REVIEW OF PERMIT DATA

• CLARIFICATION OF NEWLY LISTED WASTES AND HAZARDOUS DEBRIS

• DESIGNATION OF AMERICIUM BERYLLIUM SOURCES UNDER RCRA

• BATTERIES, WASTE ELECTROLYTE FROM RECHARGEABLE NICKEL-CADMIUM

• REGULATORY STATUS OF PETROLEUM CONTAMINATED MEDIA AND DEBRIS UNDER THE 

TOXICITY CHARACTERISTIC UST TEMPORARY DEFERRAL

• REGULATORY STATUS OF BRASS PARTICLES GENERATED IN THE BELTING AND BUFFING 

OF BRASS CASTINGS

• REMOVAL OF TOXICITY CHARACTERISTIC WASTES FROM A SURFACE IMPOUNDMENT

• PETROLEUM-CONTAMINATED MEDIA AND DEBRIS DEFERRAL FROM THE TOXICITY 

CHARACTERISTIC

• LAND DISPOSAL RESTRICTIONS (LDR) TREATMENT STANDARDS AND DISPOSAL OPTIONS 

FOR CONTAMINATED SOIL

• ELECTRIC UTILITY POLES

• TC APPLICABILITY TO MIXED WASTE

• TC RULE HAZARDOUS WASTE DETERMINATION

• SQG COMPLIANCE WITH TC RULE

• EPA'S NON-OBJECTION TO IMPORTS OF COBALT OXIDE-MOLYBDIC OXIDE SPENT 

CATALYSTS INTO THE U.S. FOR RECOVERY

• SLUDGES WITHIN SURFACE IMPOUNDMENTS, NEWLY REGULATED DUE TO TC RULE

• SILVER IN WASTES AND IN SEWER DISCHARGES FROM THE PHOTO-FINISHING INDUSTRY

 30