In the sampling procedure for a roadway berm or windrow, what portion of the material should be removed first?

In the sampling procedure for a roadway berm or windrow, starting with the top one-third of the material is crucial for obtaining a representative sample. This practice is based on the understanding that the upper layer often contains the most recent material that has been deposited or accumulated, which may provide insights into the current conditions and characteristics of the material.

Sampling from the top one-third ensures that the inspector captures any contaminants, pollutants, or variations in material properties that may have affected the upper layers, which are critical for a proper assessment of quality. It is also reflective of real-world conditions, as the top layer is typically more accessible and influenced by environmental factors.

By beginning the sampling process from this section, inspectors can gather a more comprehensive understanding of the material's composition, allowing for better decision-making when it comes to its suitability for roadwork or other applications. This approach helps enhance the accuracy of the test results, ultimately leading to improved quality control in engineering practices.