Construction Lessons Learned for Large Diameter Wastewater Piping Rehabilitation

The focus of this presentation is to highlight why detailed data collection is important during condition assessment and the need for continued coordination between the design engineer and condition assessment engineer to mitigate unexpected changes during the rehabilitation design process. The San Jose-Santa Clara Regional Wastewater Facility is now finishing Phase 2 of its Yard Piping Improvements Project, which included rehabilitating an 84-in. pipeline 5 years after its condition assessment and the changed pipeline conditions encountered. This paper presents an overview of the condition assessment approach and findings, rehabilitation design package preparation, including assumed construction allowances, a recount of how construction proceeded, and lessons learned from the City of San Jose’s perspective to save time and money during construction. Key takeaways: (1) Benefits of condition assessment for preparing rehabilitation design packages; (2) considerations during pipeline rehabilitation construction; and (3) lessons learned from Owner’s perspective.