CDPH Lead Inspector/Assessor California State Practice Exam

What hazardous waste analysis procedure is known as the Waste Extraction Test?

1. Extraction Procedure

2. Soluble Threshold Limit Concentration (STLC)

3. Toxicity Characteristic Leaching Procedure

4. Waste Analysis Method

The correct answer is: Soluble Threshold Limit Concentration (STLC)

The Waste Extraction Test, commonly known as the Toxicity Characteristic Leaching Procedure (TCLP), is a critical analysis used to determine whether a solid waste is hazardous. This procedure simulates the leaching process that occurs in a landfill environment to assess the potential for harmful constituents in the waste to be released into the environment. The TCLP operates by taking a sample of the waste, extracting it using a specific extractant solution, and then analyzing the leachate for the presence of toxic substances. If the concentration of any toxic substances in the leachate exceeds regulatory thresholds, the waste is classified as hazardous. This test is essential for waste management practices, ensuring proper disposal and compliance with environmental regulations. This method is distinct from other analyses, such as the Soluble Threshold Limit Concentration (STLC), which specifically measures the concentration of metals that can leach out of the waste but does not simulate a landfill environment. While both relate to hazardous waste assessments, the TCLP is specifically designed for comprehensive evaluation of potential leaching behavior.