What type of log is most commonly made from a test hole?

The most commonly made log from a test hole is the drilling log. A drilling log serves as a comprehensive record of the drilling activities undertaken at a site, documenting various parameters such as the depth of the hole, the types of soil and rock encountered, and the time spent at different depths. This information is crucial for understanding the geological characteristics of the area and for assessing groundwater resources.

A drilling log typically includes details like drilling methodology, any challenges faced during drilling, and observations relevant to the soil and rock layers. This data is fundamental for groundwater assessments, making it a key tool in hydrogeology and environmental studies.

In contrast, a caliper log measures the diameter of the borehole and is helpful for identifying variations in borehole size but does not provide a broader geological context. A gamma log detects natural radioactivity in geological formations, offering insights about the mineral composition but is not as universally utilized as a drilling log. A temperature log records temperature variations in the borehole, which can be useful for specific assessments but does not provide the comprehensive data captured in a drilling log.

Thus, the utility and broader application of the drilling log in documenting all relevant drilling information make it the most commonly created log from a test hole.