Sample tests on soil should be how deep?

Sample tests on soil should be how deep?

• A. 1/4 inch
• B. 1/2 inch
• C. 1 inch
• D. 2 inches

Answer: (B)

The thing being tested is how deep to take soil samples to accurately assess lead exposure in residential soil. The recommended depth is about a half inch below the surface. This depth targets the soil layer that children are most likely to contact or ingest during play, giving a realistic measure of the lead hazard in the area where exposure occurs. Sampling too shallow would mostly capture loose surface dust and debris rather than the soil that poses a true exposure risk, while sampling much deeper would miss the surface soil that contributes most to everyday exposure. A half-inch depth thus provides a practical balance and aligns with standard soil lead testing practices.

The thing being tested is how deep to take soil samples to accurately assess lead exposure in residential soil. The recommended depth is about a half inch below the surface. This depth targets the soil layer that children are most likely to contact or ingest during play, giving a realistic measure of the lead hazard in the area where exposure occurs. Sampling too shallow would mostly capture loose surface dust and debris rather than the soil that poses a true exposure risk, while sampling much deeper would miss the surface soil that contributes most to everyday exposure. A half-inch depth thus provides a practical balance and aligns with standard soil lead testing practices.