You were called into a meeting with the director of Communication Services (your supervisor) to explain the cost overruns. The meeting did not go well, and you were requested to review your estimates for any other possible cost overruns.
You reviewed the network design and were satisfied with it. You examined the core router you planned to connect the new building network to and discovered the interface you planned to use was no longer available.
You asked the core network engineer what happened to the interface that was set aside for the new building and she responded that she didn't know you had wanted to reserve that interface, and that if she'd known she would have reserved it. While there were two more available, she said that both were reserved for other projects.
You obtained from the core engineer an estimate for providing another blade for the router, a cost that increased your already bloated estimate. You had another heart-to-heart talk with your supervisor. He took some of the blame for the cost increases, as he realized he should had worked closer with you on this project from the beginning.
Substantial completion