Environmental Protection Agency (EPA) Lead Risk Assessor Practice Exam

What is the maximum number of subsamples allowed in a composite paint chip sample?

1. 10

2. 8

3. No more than 5

4. 3

The correct answer is: No more than 5

In the context of composite paint chip sampling for lead analysis, the guidelines set a limit on the number of subsamples that can be combined to form a composite sample. The maximum number of subsamples allowed in a composite paint chip sample is capped at five. This limit ensures that the sample remains representative of the location being assessed while also adhering to the accuracy and reliability needed for lead risk assessment. Using more than five subsamples could result in a dilution of the measured lead concentration, potentially masking high lead levels from specific areas. This is crucial in identifying lead risks effectively, especially in environments such as homes built before 1978 where lead-based paints were commonly used. Therefore, adhering to this maximum ensures that the risks associated with lead exposure are accurately identified and assessed, allowing for more effective mitigation strategies.