The first layer is the natural soil or engineered fill.
Before installing the aggregate layer, contractors should address:
- Unsuitable soil
- Organic material
- Soft spots
- Excessive moisture
- Poor drainage
- Differential settlement risks
The subgrade is then compacted using appropriate equipment.
A commonly encountered project specification may require a compaction level around 93% or higher, but this should not be treated as a universal requirement. The appropriate target depends on the soil classification, project design, applicable geotechnical specification, and compaction test method.
For professional sports facilities, a geotechnical assessment is preferable to relying on a generic percentage.
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