What types of information can test holes provide regarding water quality?

Test holes are primarily used to gather essential data regarding the geological and hydrological characteristics of an area. The ability to analyze water quality from these holes typically encompasses measurements that reflect the physical and chemical properties of water.

When discussing water quality specifically, the focus tends to be on parameters that directly affect its suitability for different uses and its health implications. Among the various aspects, conductivity, salinity, pH, and bacterial contamination are crucial.

The correct selection covers critical water quality indicators. Electrical conductivity and temperature are relevant in assessing water quality, as conductivity is impacted by the presence of dissolved salts and other ions, indicating water salinity. pH is a key measure of acidity or alkalinity, which can affect aquatic life and ecosystem health.

While grain size may indicate the physical characteristics of the surrounding materials, it does not provide direct information about water quality in the same context as the other mentioned metrics. Therefore, the parameters mentioned align correctly with the types of information that test holes can reveal about water quality.