CDPH Lead Inspector/Assessor California State Practice Exam

What is the maximum number of wipes that can be inserted into a single container for a composite dust wipe sample?

1. 2

2. 3

3. 4

4. 5

The correct answer is: 4

The maximum number of wipes that can be inserted into a single container for a composite dust wipe sample is correctly identified as four. This standard is set to ensure that samples are representative while also maintaining the integrity of the dust wipe sample collected. Using four wipes in a single container allows for a more comprehensive assessment of lead dust levels in the environment without diluting the sample or risking cross-contamination. The practice of composite sampling acknowledges that lead contamination can vary across surfaces and areas, and combining multiple wipes helps to achieve a better average concentration for testing. Adhering to this guideline is crucial for accurate sampling in lead inspections and assessments as it informs appropriate remediation actions and helps in regulatory compliance.