Anda adalah supervisor proyek konstruksi. Anda menerima laporan kemajuan proyek berikut: "Project Status Update: City Bridge Renovation Date: October 26, 2023 Prepared by: Engineering Team Progress Summary:

• Foundation work: 90% complete (ahead of schedule)
• Steel structure erection: 60% complete (on schedule)
• Road paving: 10% complete (delayed due to unexpected heavy rain last week)

Upcoming Challenges:

• Procurement of specialized asphalt for road paving.
• Potential labor shortage next month due to holiday season.

Next Steps:

• Expedite asphalt procurement.
• Develop contingency plan for labor shortage."

Berdasarkan laporan tersebut, masalah terbesar yang sedang dihadapi proyek saat ini dan perlu segera diatasi adalah?