Substructures are foundations, pile caps or underground concrete beams.

Retaining walls are structures which are designed to retain soil and slopes. This happens when there is a change to the elevation of the ground. Retaining walls are typically used on road construction, where the road is cut through the hill side and to used to retain the remainder of the hill side.

Substructures and Retraining Walls Substructures and Retraining Walls Substructures and Retraining Walls