Where should samples be taken from to obtain a representative aggregate stockpile sample?

To obtain a representative aggregate stockpile sample, the correct practice is to take samples from the working face of the pile. This area reflects the material that is currently being extracted and used in production, ensuring that the sample accurately represents the overall quality and properties of the aggregate being supplied.

When sampling from the working face, the inspector can assess the material that is actively being utilized, which is crucial for understanding how the aggregates will perform in concrete or other constructions processes. It helps in identifying any variations in size, shape, or quality that might exist within the stockpile.

Sampling from the bottom of the stockpile could lead to an unrepresentative sample, as it may contain older material that has settled over time, differing in quality from the top. Collecting only from the top layer fails to capture the diversity of the aggregates within the pile, potentially overlooking variations that could affect the final product. Taking samples exclusively from the middle of the pile also does not guarantee a comprehensive understanding of the aggregate quality, as it does not take into account the latest material being processed or variations that exist throughout the stockpile. Therefore, the working face is the most reliable and representative location for effective sampling.