PMP Practice: Determine critical information requirements

Ocean Okonkwo is managing a municipal water treatment facility upgrade for Sage Petersen Authority. During integrated planning, the engineering lead insists on extending the testing phase by three weeks to validate newly installed filtration systems meet EPA compliance standards. The construction superintendent argues this delay will push the project into winter, when freezing temperatures will halt outdoor pipeline work for two months and add $340,000 in weather-related costs. The project sponsor has made it clear that the facility must begin partial operations by December 1st to serve a new industrial park that has already signed service contracts. Both the testing extension and the weather delay would push operations past this date. The project is currently on schedule and within budget. What should Ocean do to best integrate these competing planning considerations?