When utilizing the bore test method, what must be done to the test holes after drilling is complete?

The bore test method involves drilling test holes in order to assess the subsurface conditions, often related to soil stability or moisture levels. Once the drilling is complete, it is crucial to properly seal or close these holes to prevent any future issues, such as water infiltration, soil erosion, or health and safety hazards.

Plugging the holes with a treated dowel is the correct procedure because it effectively prevents further access to the holes, reducing the risk of accidents. The treated dowel also helps to keep contaminants from entering the subsurface and can prevent the holes from becoming a breeding ground for pests or a trap for animals. This method is preferred as it offers a safe and manageable solution to sealing the holes while also being environmentally responsible.

In contrast, leaving the holes open could pose a serious risk to both personnel and the environment, while covering with a tarp may not provide a secure or permanent solution. Filling with concrete could be excessive and not always necessary, depending on the purpose of the bore test. Thus, using a treated dowel is a practical and effective approach to managing the completed test holes.