Hazardous Waste

North Coast Laboratories can assist you in determining whether your waste has excessive contaminants, primarily heavy metals, under state and federal guidelines. If the material is hazardous, then it must be recycled, treated, stored, or disposed at a proper hazardous waste facility. TTLC and STLC analyses are used to determine whether solid wastes are hazardous under state regulations (Title 22 of the California Code of Regulations). TCLP analyses are waste characterizations based on federal regulations. STLC and TCLP procedures are designed to simulate what happens to a waste material in a landfill using artificial leachates.

Test Parameters	Method
TTLC Requirements
CAM 17 Metals	Various
Chromium VI	EPA 7196
Fluoride	EPA 300.0 Mod.
2,4-D and 2,4,5-TP Silvex	EPA 8151A
Organochlorine Pesticides and PCBs	EPA 8081 & 8082
Pentachlorophenol (PCP)	CPAR
Trichloroethylene (TCE)	EPA 8260B

STLC Requirements
CA Waste Extraction Test (WET)	CCR Title 22
WET using DI Water – Chromium VI only	CCR Title 22
CAM 17 Metals	Various

Toxicity Characteristic Leaching Procedure (TCLP)
Extraction for Metals, Herbicides, Pesticides & Semivolatiles	EPA 1311
Metals (As, Ba, Cd, Cr, Pb, Hg, Se, Ag)	Various
Phenoxy Herbicides (2,4-D & 2,4,5-TP Silvex)	EPA 8151A
Organochlorine Pesticides	EPA 8081

Metals Extractions

TTLC

TTLC stands for Total Threshold Limit Concentration. This is how metals results are normally expressed for solid samples. If you do not specify a special extraction procedure on your chain of custody your metals will be reported as TTLC values.

CAM / STLC

STLC stand for Soluble Threshold Limit Concentration. This extraction is used to determine whether certain leachable compounds are present in large enough amounts in a given material that the material need to be dealt with as hazardous waste. The extraction procedure mimics what will happen to a given material as it is exposed to normal climatic conditions in a landfill over time. When this extraction is used solid matrices will be reported in liquid units.

TCLP

TCLP stands for Toxicity Characteristic Leaching Procedure. This extraction is one of four characteristics used to identify hazardous waste; the other three are Ignitabilty, Corrosivity and Reactivity. The TCLP extraction is designed to simulate the climatic leaching action expected to occur in landfills. It identifies and quantifies 8 metals and 25 organic compounds (pesticides, herbicides, etc.) with the potential to leach into ground water. When this extraction is used solid matrices will be reported in liquid units.

When to Do a STLC Extraction

The limits for STLC and TTLC metals are listed below along with the range of TTLC concentrations for which a STLC extraction must be done.

Substance	STLC (mg/L)	Range of TTLC Values for Which an STLC Must Be Done	Wet Weight TTLC (mg/kg)
Antimony	15	≥ 150 mg/kg	500
Arsenic*	5	≥ 50 mg/kg	500
Barium*	100	≥ 1000 mg/kg	10,000
Beryllium	0.75	≥ 7.5 mg/kg	75
Cadmium*	1	≥ 10 mg/kg	100
Chromium 6*	5	≥ 50 mg/kg	500
Chromium*	5	≥ 50 mg/kg	2,500
Cobalt	80	≥ 800 mg/kg	8,000
Copper	25	≥ 250 mg/kg	2,500
Lead*	5	≥ 50 mg/kg	1,000
Mercury*	0.2	≥ 2 mg/kg	20
Molybdenum	350	≥ 3,500 mg/kg	3,500
Nickel	20	≥ 200 mg/kg	2,000
Selenium*	1	≥ 10 mg/kg	100
Silver*	5	≥ 50 mg/kg	500
Thallium	7	≥ 70 mg/kg	700
Vanadium	24	≥ 240 mg/kg	2,400
Zinc	250	≥ 2,500 mg/kg	5,000
*TCLP Metals If you have a solid sample analyzed for metals (TTLC) you must do an STLC for those metals that are 10 times or greater than the STLC limit. For example – The TTLC limit for antimony is 500 mg/kg and the STLC limit is 15 mg/L. If your TTLC result is 150 mg/kg or higher they you must do an STLC for antimony.

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