During drilling of an environmental investigation boring, which item is usually not recorded on either the driller's log or geologist's log?

• A. Depth to groundwater
• B. The chemical-analytical laboratory where samples are sent
• C. Lithology notes
• D. Date of boring

Answer: (B)

The thing these two logs are meant to capture are what you encounter and record while drilling and describing the borehole itself—the subsurface conditions and drilling progress. The driller’s log tracks how drilling proceeded, depths reached, drilling methods, fluids used, and groundwater encountered, plus any samples recovered during drilling. The geologist’s log records lithology notes—rock and soil types, color, texture, grain size—along with stratigraphic Layers and the intervals where samples were taken, and any pertinent site observations.

The chemical-analytical laboratory where samples are sent belongs to the analytical workflow after the borehole work is done. That information is typically captured on sample submission forms, chain-of-custody documents, and the lab results reports, not on the borehole logs. Including the lab name in the logs would mix subsurface description with downstream laboratory processing, which is why it’s usually not recorded there.

So, the item not typically found on either log is the chemical-analytical laboratory where samples are sent.