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Depict a scenario where a civil engineering project involves the construction of a bridge spanning a wide river in a seismic zone. Discuss in detail the various factors that need to be considered during the planning, design, and construction phases to ensure the structural integrity and resilience of the bridge against seismic events. Address aspects such as site selection, geological and geotechnical investigations, seismic hazard assessment, structural design criteria, material selection, foundation design, construction methods, and quality control measures. Additionally, analyze how the bridge's functionality, durability, and safety can be enhanced through innovative engineering solutions and adherence to relevant codes and standards. Finally, discuss the importance of ongoing monitoring and maintenance activities to mitigate potential risks and ensure the long$-$term performance of the bridge in the face of seismic hazards. Your response should demonstrate a comprehensive understanding of the complex interplay between seismic forces and bridge engineering principles, as well as the multidisciplinary nature of civil engineering projects in challenging environments.