In which practice should you request a grading sample from the truck driver to ensure proper sand grading?

In which practice should you request a grading sample from the truck driver to ensure proper sand grading?

• A. Move the sand to the far side of the site
• B. Request a grading sample from the driver
• C. Keep the sand on the grass during transport
• D. Spread the sand immediately without inspection

Answer: (B)

Verifying sand gradation is a quality-control step you take before using materials in an onsite system. By requesting a grading sample from the truck driver, you get an actual measurement of the sand’s particle-size distribution to compare with the project specifications. This helps ensure the sand will provide the right drainage and filtration in the absorption bed and won’t cause problems like clogging from too many fines or poor percolation from too many large grains. If you don’t check gradation, you risk using material that doesn’t meet the design criteria, which can compromise system performance. Simply moving sand around or transporting it without inspection doesn’t verify its quality, and spreading it immediately without checking it bypasses this essential control.

Verifying sand gradation is a quality-control step you take before using materials in an onsite system. By requesting a grading sample from the truck driver, you get an actual measurement of the sand’s particle-size distribution to compare with the project specifications. This helps ensure the sand will provide the right drainage and filtration in the absorption bed and won’t cause problems like clogging from too many fines or poor percolation from too many large grains. If you don’t check gradation, you risk using material that doesn’t meet the design criteria, which can compromise system performance. Simply moving sand around or transporting it without inspection doesn’t verify its quality, and spreading it immediately without checking it bypasses this essential control.