For a truck dump or stockpile sample, how many times should the material be mixed?

When collecting a truck dump or stockpile sample, mixing the material twice ensures a more representative and uniform sample for testing. The first mixing helps to achieve overall homogeneity within the sample, addressing any segregation that may have occurred during transport or storage. By mixing it again, you further reduce the chance of variability and ensure that different portions of the sample maintain consistent material characteristics.

The aim is to obtain samples that accurately reflect the entire load or stockpile, as variations can occur due to differences in particle size, moisture content, or composition. Mixing twice strikes a balance between thoroughness and efficiency, allowing technicians to collect representative samples that are reliable for testing without unnecessarily prolonging the process. This methodology aligns with industry standards, which emphasize the importance of proper sampling techniques in achieving valid test results.