How much extra depth beyond testing depth should the drill rod be driven?

Prepare for the FDOT Earthwork Level 1 Test. Study with multiple choice questions and explanations, each designed to enhance retention. Ensure you're ready for the exam!

Multiple Choice

How much extra depth beyond testing depth should the drill rod be driven?

Explanation:
In drilling for soil testing, you should drive the drill rod a small amount beyond the testing depth. This extra two inches ensures the rod end stays engaged in the soil and provides a stable reference after the last hammer stroke, so the final testing depth is accurate when you withdraw the rod. Zero extension can lead to sampling or depth-read errors, and extending too much isn’t necessary and can complicate retrieval. Two inches is the standard amount to use.

In drilling for soil testing, you should drive the drill rod a small amount beyond the testing depth. This extra two inches ensures the rod end stays engaged in the soil and provides a stable reference after the last hammer stroke, so the final testing depth is accurate when you withdraw the rod. Zero extension can lead to sampling or depth-read errors, and extending too much isn’t necessary and can complicate retrieval. Two inches is the standard amount to use.

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