How would you approach optimizing the construction schedule for a large$-$scale civil engineering project? Consider various factors such as resource allocation, project sequencing, and risk management. Assess the impact of different scheduling techniques, including critical path method $($CPM$),$ program evaluation and review technique $($PERT$),$ and resource leveling. Furthermore, analyze the significance of incorporating contingency plans to mitigate unforeseen delays and challenges. Evaluate the role of technology, such as Building Information Modeling $($BIM$)$ and project management software, in streamlining scheduling processes and enhancing overall project efficiency. Lastly, discuss the importance of effective communication and collaboration among project stakeholders in ensuring the successful execution of the construction schedule.