Sand Profile 
An area that has been excavated, pipe-drained, a 100mm or so gravel base or raft installed; then it is overlaid with a sandy grit blinding layer to a depth of 50mm; and then finally topped with about 250mm of firmed sand.
Sand Profile
An area that has been excavated, pipe-drained, a 100mm or so gravel base or raft installed; then it is overlaid with a sandy grit blinding layer to a depth of 50mm; and then finally topped with about 250mm of firmed sand.