Environmental Protection Agency (EPA) Model Lead Based Paint Risk Assessor Practice Test

How many dust wipe samples should be collected for a composite sample?

1. 1 sample

2. 4 samples

3. 6 samples

4. 8 samples

The correct answer is: 4 samples

In the context of collecting composite dust wipe samples for lead hazard assessments, the correct number of individual dust wipe samples to combine into one composite sample is four. This practice is based on guidelines set forth by the Environmental Protection Agency (EPA) to ensure that the composite sample is representative of the dust lead levels present in an area while maintaining a manageable volume of collected material for analysis. Collecting a composite sample consists of multiple individual samples taken from various locations within a defined area or room. By gathering four samples, you create a more thorough representation of lead dust contamination, as it allows for a better average of the lead levels present across those locations. Fewer samples would not capture the variability that might exist, while more samples could lead to unnecessary complexity and volume, making analysis more difficult. This methodology supports accurate assessments of lead exposure risks and is crucial for compliance with regulations aimed at ensuring safe living conditions in homes, especially those with children who are particularly vulnerable to the effects of lead exposure.