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

What should be done if a blank sample is contaminated?

1. The data should still be used

2. The contaminated sample should be archived

3. The unit in question should be re-sampled

4. The results should be discussed with the client

The correct answer is: The unit in question should be re-sampled

If a blank sample is contaminated, the most appropriate course of action is to re-sample the unit in question. A blank sample serves as a control to ensure that the testing process itself is not introducing any lead or other contaminants. When a blank sample shows contamination, it indicates that there may have been an issue with the sampling process, contamination in the equipment, or the environment in which the samples were collected. Re-sampling allows for the collection of new data that is reliable and free from any external contamination that may have affected the initial results. This step is crucial for maintaining the integrity of the testing process and ensuring accurate assessments regarding lead exposure and potential risks. Using the data from contaminated samples could lead to faulty conclusions about lead presence, risk assessment, and necessary actions for remediation. Archiving the contaminated sample does not resolve the issue, and discussing the contaminated results without re-sampling may lead to misunderstandings. Thus, re-sampling ensures that all findings are based on accurate and uncontaminated data, allowing for informed decision-making regarding health and safety.