Which of the following is NOT a common method for controlling sediment on construction sites?

Controlling sediment on construction sites is essential to prevent soil erosion and protect water quality. Silt fences and sediment traps are recognized practices specifically designed to manage sediment runoff. Silt fences act as barriers that filter out sediment from water, while sediment traps capture sediment-laden water before it can discharge into surrounding areas.

Bio-retention areas also play a significant role in managing runoff and sediment. They are specifically designed to absorb and filter stormwater, thus minimizing erosion and sediment transport.

The mention of sandy soil layers as a sediment control method is not standard practice. While sandy soils can offer some drainage benefits, they do not effectively control sediment erosion and transport in the way that the other methods do. Therefore, incorporating sandy soil layers is not a recognized method for controlling sediment on construction sites, making it the correct choice as the option that does not belong among the common sediment control strategies.