The cover aggregate is stockpiled before the start of the seal coat project. The stockpiles are placed alongside the roadway in the immediate vicinity of the project so that the aggregate does not have to be hauled a long distance when seal coat work begins.

The trucks used to transport the aggregate and dump it into the spreader box are usually of the end-dump variety. They are normally either tandem-axle or single axle trucks like the one shown in Figure 7‑38.