What must occur at least one hour after the final cleanup during clearance?

The requirement for taking dust wipe samples at least one hour after the final cleanup during clearance is rooted in ensuring that the area is thoroughly evaluated for lead hazards. This sampling process helps to determine if lead dust levels are below the permissible limits established by regulations. It is essential for confirming that the abatement activities have effectively reduced lead contamination and that the space is safe for reoccupancy.

Conducting these dust wipe samples after a minimum waiting period allows any residual dust that may have settled post-cleanup to be assessed accurately. Additionally, proper timing ensures that the samples reflect the true conditions of the environment following the abatement work. This step is crucial for both regulatory compliance and the safety of occupants.

Clearance through dust wipe sampling is a critical component of the lead abatement process, emphasizing the importance of verifying the success of the cleanup efforts before the area can be declared lead-safe.