Environmental Safety

 

 

What is a Hazardous Chemical Waste?

P&U Listed Hazardous Wastes (PDF file) | F Listed Hazardous Wastes

The proper identification of regulated hazardous chemical waste or "Controlled Hazardous Waste" (Maryland uses the term Controlled Hazardous Substance as a synonym for hazardous waste) is essential to facilitate the proper disposal of those wastes. Waste compounds or solutions which meet one or more of the following criteria or are on one of the following lists are regulated as a hazardous waste by the EPA and the State of Maryland:

I. It is a solid waste which exhibits one or more of the hazardous waste characteristics for: Ignitability

  1. A liquid, other that an aqueous solution containing less that 24 percent alcohol by volume, and has a flash point less than 60 degrees Centigrade (140 degrees Fahrenheit); or
  2. Not a liquid but is capable under standard temperature and pressure, of causing fire through friction, absorption of moisture or spontaneous chemical changes, and when ignited burns vigorously and persistently that it creates a hazard; or
  3. An ignitable compressed gas as described in 49CFR 173.300 and as determined by the test methods described in that regulation; or
  4. An oxidizer as defined in 49CFR 173.151

Corrosivity

  1. An aqueous liquid that has a pH less than or equal to 2 or greater than or equal to 12.5; or
  2. A liquid that corrodes steel at a rate greater than 6.35 mm per year at a temperature of 55 degrees Centigrade (130 degrees Fahrenheit) as specified in the appropriate test method.

Reactivity

  1. Any hazardous material that is normally unstable and readily undergoes violent change without detonating; or
  2. It reacts violently or forms potentially explosive mixtures with water; or
  3. Any cyanide or sulfide bearing waste that when exposed to pH between 2 and 12.5, can generate toxic gases, vapors or fumes in at quantity sufficient to present a danger to human health or the environment; or
  4. It is capable of detonation or explosive reaction if it is subjected to at strong initiating source or if heated under confinement; or
  5. it is readily capable of detonation or explosive decomposition or reaction as standard temperature or pressure; or
  6. An explosive as defined in 49CFR 173.51, 49CFR 173.53, or 49CFR 173.88.

Toxicity

The criteria for toxicity may be fulfilled if one or more of the following chemicals are present in at solution or compound at a concentration at or above the specified regulatory level:

EPA Hazardous Waste # Contaminant Regulatory Level (mg/L) (mg/kg)
D004 ARSENIC 5.0
D005 BARIUM 100.0
D018 BENZENE 0.5
D006 CADMIUM 1.0
D019 CARBON TETRACHLORIDE 0.5
D020 CHLORDANE 0.03
D021 CHLOROBENZENE 100.0
D022 CHLOROFORM 6.0
D007 CHROMIUM 5.0
D023 o-CRESOL 200.0
D024 m-CRESOL 200.0
D025 p-CRESOL 200.0
D026 CRESOL 200.0
D016 2,4, D 10.0
D027 1,4-DICHLOROBENZENE 7.5
D028 1,2-DICHLOROETHANE 0.5
D029 1,1-DICHLOROETHYLENE 0.7
D030 2,4-DINITROTOLUENE 0.13
D012 ENDRIN 0.02
D031 HEPTACHLOR 0.008
D032 HEXACHLOROBENZENE 0.13
D033 HEXACHLOROBUTADIENEE 0.02
D034 HEXACHLOROETHANE 3.0
D008 LEAD 5.0
D013 LINDANE 0.4
D009 MERCURY 0.2
D014 METHOXYCHLOR 10.0
D035 METHYL ETHYL KETONE 200.0
D036 NITROBENZENE 2.0
D037 PENTACHLOROPHENOL 100.0
D038 PYRIDINE 5.0
D010 SELENIUM 1.0
D011 SILVER 5.0
D039 TETRACHLOROETHYLENE 0.7
D015 TOXAPHENE 0.5
D040 TRICHLOROETHYLENE 0.5
D041 2,4,5-TRICHLOROPHENOL 400.0
D042 2,4,6-TRICHLOROPHENOL 2.0
D017 2,4,5-TP (SILVEX) 1.0
D043 VINYL CHLORIDE 0.2

II. It is listed as a hazardous wastes from discarded commercial products, off-specification species, container residues, and spill residues (P & U Listed Wastes)

III. It is listed as a hazardous waste from non-specific sources (F Listed Wastes)

IV. It is listed as a hazardous waste from specific sources that include primarily industrial sources. (K Listed Wastes)

OSHA Link (Haz.Tox.Sub.)
OSHA Link (Lead)

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