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technical resource center < hazardouse waste characterization <

Soluble Threshold Limit Concentration (STLC) and Total Threshold Limit Concentration (TTLC) Regulatory Limits¹

Inorganic Substances STLC2 Regulatory Level, mg/L TTLC3 Regulatory Level, mg/kg, Wet Weight Recommended EPA Test Method
Antimony and/or Antimony compounds 15 500 6010B/7000A
Arsenic and/or Arsenic compounds 5.0 500 6010B/7000A
Asbestos   1% PCM/PLM
Barium and/or Barium compounds 100 4 10000 6010B/7000A
Beryllium and/or Beryllium compounds 0.75 75 6010B/7000A
Cadmium and/or Cadmium compounds 1 100 6010B/7000A
Chromium (VI) compounds 5 500 6010B/7000A
Chromium and/or Chromium (III) compounds 5 5 2,500 6010B/7000A
Cobalt and/or Cobalt compounds 80 8,000 6010B/7000A
Copper and/or Copper compounds 25 2,500 6010B/7000A
Fluoride salts 180 18,000 300/340.2
Lead and/or Lead compounds 5.0 1,000 6010B/7000A
Mercury and/or Mercury compounds 0.2 20 6010B/7000A
Molybdenum and/or Molybdenum compounds 350 3,500 6010B/7000A
Nickel and/or Nickel compounds 20 2,000 6010B/7000A
Selenium and/or Selenium compounds 1.0 100 6010B/7000A
Silver and/or Silver compounds 5 500 6010B/7000A
Thallium and/or Thallium compounds 7.0 700 6010B/7000A
Vanadium and/or Vanadium compounds 24 2,400 6010B/7000A
Zinc and/or Zinc compounds 250 5,000 6010B/7000A
1 Used for California regulated hazardous waste. Source is California Code of Regulations, Title 22, Chapter 11, Article 3.
2
If a substance is ten times (by rule of thumb) the STLC value found on the TTLC, the Waste Extraction Test (WET) should be used. If any substance in the waste so analyzed equals or exceeds the STLC value, it is considered a hazardous toxic waste.
3 If a substance in a waste equals or exceeds the TTLC level, it is considered a hazardous toxic waste.
4 Excludes barium sulfate.
5
If the soluble chromium as determined by the TCLP is less than 5 mg/L, and the soluble chromium as determined by the STLC test equals or exceeds 560 mg/L, and the waste is not otherwise identified as a RCRA hazardous waste, then the waste is a non-RCRA hazardous waste.

 

Organic Substances STLC Regulatory Level, mg/L TTLC Regulatory Level, mg/kg, Wet Weight Recommended EPA Test Method
Aldrin 0.14 1.4 8081A
Chlordane 0.25 2.5 8081A
DDT, DDE, DDD 0.1 1.0 8081A
2,4-Dichlorophenoxyacetic acid 10 100 8150
Dieldrin 0.8 8.0 8081A
Dioxin (2,3,7,8-TCDD) 0.001 0.01 8280
Endrin 0.02 0.2 8081A
Heptachlor 0.47 4.7 8081A
Kepone 2.1 21  
Lead compounds, organic -- 13 DHS
Lindane 0.4 4.0 8081A
Methoxychlor 10 100 8081A
Mirex 2.1 21 8081A
Pentachlorophenol 1.7 17 8270C
Polychlorinated Biphenyls (PCBs) 5.0 50 8082
Toxaphene 0.5 5 8081A
Trichloroethylene 204 2040 8260B
2,4,5-Trichlorophenoxypropionic acid 1.0 10 8150

 

 

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