In field sampling, it is important to sample each type of material and have enough for a representative sample.

• A. sample each type of material and have enough for a representative sample
• B. sample only the largest batch
• C. sample after compaction
• D. sample only one piece

Answer: (A)

In field sampling, capturing the variability of what’s actually there is essential. To get a representative picture of the material you’re working with, you need to sample each type of material present and collect enough material to divide into test portions and perform multiple analyses. This approach ensures that the properties you measure—such as moisture content, density, gradation, and plasticity—reflect all materials in the field, not just a single portion. If you skip a type or rely on a tiny sample, you risk bias and results that don’t represent the whole site. Sampling after compaction isn’t appropriate because compaction alters density and moisture conditions, which can misrepresent in-situ characteristics. Likewise, taking only one piece ignores natural variability and undermines the reliability of the test results.