What is the maximum allowable concentration of lead in "clean" soil according to DNR guidelines?

The correct answer regarding the maximum allowable concentration of lead in "clean" soil according to DNR guidelines is 52 ppm (parts per million). This level is established to ensure that soil is safe for human health and the environment, particularly for children and vulnerable populations who may be exposed to lead through direct contact with soil or dust.

This concentration aligns with scientific assessments of lead’s toxicity and its potential health effects, emphasizing the importance of maintaining soil quality to mitigate health risks associated with lead exposure. Establishing a specific ppm limit helps in the management and remediation of contaminated sites, guiding lead abatement practices to ensure they meet safety standards.

Understanding this guideline is crucial for those involved in lead abatement and environmental health, as it supports efforts to create safer living environments, particularly in urban areas where lead contamination may be more prevalent.