When discrepancies are observed, who should the special inspector first notify?

The correct approach for a special inspector when discrepancies are observed is to notify the contractor first. This is because the contractor is responsible for the construction activities and will be in the best position to address any issues immediately on-site. By alerting the contractor to discrepancies, they can take corrective actions promptly to ensure that the work complies with the project specifications and applicable codes.

Notifying the contractor first facilitates a direct and immediate response to any problems. This approach fosters collaboration in resolving issues and can lead to faster adjustments, ultimately helping to maintain the project schedule. Additionally, the contractor can then communicate any necessary information to the architect or engineer, or involve the building official if the discrepancies are beyond the contractor's control.

The other options might suggest appropriate channels for reporting, but the initial point of contact for a special inspector encountering discrepancies should always be the contractor, as they are directly engaged with the construction work.