What is the MTCA Method A lead CUL for soil?

The MTCA Method A lead Cleanup Level (CUL) for soil is set at 250 mg/kg. This value is significant in managing environmental cleanup efforts as it establishes a threshold for lead concentration in soil that is considered acceptable for human health and ecological protection.

In the context of the Model Toxics Control Act (MTCA) in Washington State, these cleanup levels are used for determining the necessary actions to mitigate contamination risks. The 250 mg/kg CUL is based on risk assessment models that take into account exposure pathways and potential health impacts associated with lead, particularly to sensitive populations such as children.

The establishment of lead levels at this threshold reflects both scientific data on the toxicity of lead and regulatory aims to protect public health and the environment. It serves as a reference point for site assessments, remediation planning, and regulatory compliance in the management of hazardous substance sites.