CDPH Lead Inspector/Assessor California State Practice Exam

Which of the following practices is recommended for lead dust clearance testing?

1. Visual inspection

2. Swab sampling and analysis

3. Air sampling only

4. Using personal protective equipment alone

The correct answer is: Swab sampling and analysis

Swab sampling and analysis is the most recommended practice for lead dust clearance testing because it provides a direct measurement of lead dust levels on surfaces. This method involves using wipes or swabs to collect samples from surfaces that may be contaminated with lead dust, which are then sent to a laboratory for quantitative analysis. This approach helps determine whether the dust lead levels in a space meet the regulatory clearance criteria, ensuring that a location is safe for reoccupancy after lead remediation work. Visual inspection, while valuable, is not sufficient on its own as it does not provide quantitative data about lead levels. Similarly, air sampling can indicate airborne lead but does not assess surface lead dust contamination, which is critical for determining safety post-remediation. Relying solely on personal protective equipment does not address the need for evidence-based clearance testing; while PPE is essential during testing and remediation to protect workers from exposure, it does not assess the actual environmental lead levels.