Which of the following is NOT typically verified through the use of test holes?

The correct answer is that air quality levels are not typically verified through the use of test holes. Test holes, often drilled to investigate subsurface conditions, are primarily focused on assessing geological, hydrological, and soil properties rather than atmospheric conditions.

When test holes are created, they provide crucial information about the depth to groundwater, which helps in understanding the water table and managing water resources. They are essential in measuring water quality by collecting groundwater samples for analysis of contaminants or other chemical properties. Furthermore, sand grain size is assessed through test holes as well, providing key data on soil composition and its suitability for various engineering and environmental applications.

In contrast, air quality levels are measured through air sampling techniques and monitoring stations, not through subsurface test holes, as the latter are designed to assess conditions in the soil and groundwater.