CDPH Lead Inspector/Assessor California State Practice Exam

What type of sample is primarily collected to assess lead contamination in soil?

1. Surface soil samples

2. Subsurface soil samples

3. Groundwater samples

4. Dust wipe samples

The correct answer is: Surface soil samples

Surface soil samples are primarily collected to assess lead contamination in soil because they provide a direct indication of the contamination that may have an immediate impact on human health and the environment. Lead tends to accumulate in the top layers of soil as a result of various sources, such as past use of leaded gasoline, industrial processes, and the deterioration of lead-based paints. By testing surface soil, inspectors can evaluate the extent of lead contamination, which is critical in areas where people may come into contact with the soil, such as residential areas, playgrounds, or gardens. This sampling approach is essential for identifying potential risks and determining whether further remediation actions are necessary to protect public health. The other types of samples—subsurface soil samples, groundwater samples, and dust wipe samples—serve different purposes or contexts but are not the primary focus for directly assessing lead contamination in soil itself. Subsurface samples might be useful in certain investigations, while groundwater and dust wipe samples have more relevance for assessing lead in water and indoor environments, respectively.