1. Adequate depth. The foundation must have an adequate depth to prevent frost damage. For such
foundations as bridge piers, the depth of the foundation must be sufficient to prevent undermining
by scour.
2. Bearing capacity failure. The foundation must be safe against a bearing capacity failure.
3. Settlement. The foundation must not settle to such an extent that it damages the structure.
4. Quality. The foundation must be of adequate quality so that it is not subjected to deterioration,
such as from sulfate attack.