CDPH Lead Inspector/Assessor California State Practice Exam

What is the maximum number of sub-samples in a Soil Composite sample collection?

1. 8

2. 10

3. 12

4. 15

The correct answer is: 10

The maximum number of sub-samples in a Soil Composite sample collection is established based on standard practices for ensuring representativeness and reliability in sampling. A limit of 10 sub-samples allows for adequate variability to be captured within a composite sample while still maintaining manageable logistics during collection and analysis. This number strikes a balance between obtaining a comprehensive sample that reflects the heterogeneity of the soil and the practical constraints of fieldwork. In this context, if the number of sub-samples were to exceed this amount, it might complicate the analysis process, dilute the quality of the composite, or lead to logistical difficulties without providing significant additional information. Therefore, the chosen maximum reflects a widely accepted standard in soil sampling methodologies, particularly in environmental assessments pertaining to lead and other contaminants.