What is TCLP?
The Toxicity Characteristic Leaching Procedure, or TCLP, is EPA Method 1311. Laboratories use it to evaluate how certain organic and inorganic contaminants may move from a waste into a liquid extract. The results help evaluate the federal toxicity characteristic.
Read EPA Method 1311 and its supporting information.
What a result means
A result below the applicable toxicity-characteristic threshold means that the sample does not exhibit that characteristic for the constituents evaluated. It does not rule out other hazardous-waste characteristics or listed-waste status, and it does not authorize a reuse application.
If a result exceeds an applicable threshold, work with your environmental team, laboratory, and regulator to determine the required classification and management. Do not assume an existing reuse route remains available.
Before sampling
- Describe the foundry process, alloys, binders, and distinct material streams.
- Confirm the proposed application and receiving facility's chemical and physical specifications.
- Agree on representative sampling, analytical methods, and documentation with a qualified laboratory and the parties responsible for acceptance.
- Keep sample identification and chain-of-custody records with the analytical report.
Common questions
Does passing TCLP mean the material can be reused?
No. State requirements, other material characteristics, engineering specifications, and site or project approvals may apply. Confirm acceptance for the specific material and use.
Is TCLP the only test a foundry may need?
No. The required analysis depends on the process, material, receiving specifications, and applicable program. A laboratory or environmental professional can help establish the appropriate scope.
When should the material be evaluated again?
Follow the frequency required by the approval or receiving facility. A change in alloy, binder, process, or material stream may also require a new evaluation before additional loads move.
What should I send FRS?
Send the material description, plant location, monthly volume, loading setup, and complete available analytical reports. Include information about sampling dates and any process changes.