Environmental Protection Agency (EPA) Lead Risk Assessor Practice Exam

What is the maximum acceptable recovery rate for dust wipe sampling?

1. 50% - 70%

2. 60% - 80%

3. 70% - 90%

4. 80% - 120%

The correct answer is: 80% - 120%

The maximum acceptable recovery rate for dust wipe sampling being 80% - 120% is based on established guidelines and standards for accurately measuring lead levels in dust. This range reflects the acceptable variability and accuracy of the sampling process, taking into consideration both the analytical techniques used and the inherent differences in dust composition across various environments. In dust wipe sampling, the goal is to ensure that the results are indicative of the actual lead contamination present. A recovery rate within the 80% - 120% range suggests that the sampling process and analysis are reliable enough to provide a true reflection of lead levels, ensuring safety assessments can be accurately conveyed to stakeholders involved in lead risk assessments, public health, and environmental safety. Recovery rates lower than 80% or higher than 120% would indicate problems with the sampling or analysis, such as loss of material during the sampling or analytical processes, leading to underestimation or overestimation of lead levels. Such inaccuracies could significantly impact public health decisions and lead management strategies. Therefore, adhering to the established recovery rate standards is crucial for the precision and credibility of lead risk assessments.