What concentration of lead requires additional testing for hazardous waste determination?

The correct concentration of lead that necessitates additional testing for hazardous waste determination is in the range of 50 mg/kg to 1000 mg/kg. This range is significant because the detection of lead at these levels indicates that the material may pose a risk to human health and the environment, thereby triggering the need for further assessment.

In California, the criteria established under the state hazardous waste regulations are designed to ensure any material that might be harmful due to contamination is evaluated thoroughly. When lead levels fall within this range, it raises the concern that the material may exceed hazardous waste thresholds based on additional tests such as the Toxicity Characteristic Leaching Procedure (TCLP).

Materials with higher lead concentrations could potentially leach lead into the environment, creating toxic exposure risks. Thus, recognizing and addressing lead levels in this specific concentration range is crucial for compliance with environmental regulations and for the protection of public health and safety.