What is the acceptable lead level for replaced soil to avoid exceedance?

The acceptable lead level in replaced soil is set at 400 parts per million (ppm) to avoid exceedance. This threshold is based on health risk assessments that aim to protect human health, particularly children's health, as they are more vulnerable to the adverse effects of lead exposure.

When soil is replaced, it is crucial to maintain lead levels below this limit to minimize the risk of lead poisoning, which can occur with higher concentrations. Regulatory agencies, including the Environmental Protection Agency, have established this level through extensive research and guidelines that take into account factors such as exposure routes and the potential for accumulation in the body.

While options reflecting lower and higher lead levels might suggest their suitability, the 400 ppm mark has been deemed the maximum safe concentration for soil remediation efforts, emphasizing the importance of maintaining a healthy environment, especially in residential areas where children play. This standardized threshold helps ensure that replaced soil does not pose health risks to the community.