Pipelines and manholes are rehabilitated using a combination of methods, including but not limited to the following:
- Injection Grouting – acrylic grout is pressure injected through a defect in the pipe, forming an impermeable barrier
- Cured In Place Pipe (CIPP) Lining – a flexible liner is inserted inside the existing pipe, inflated, and then hardened, forming a smooth surface inside the existing pipe
- Open Trench Excavation – crews will dig down to and expose existing pipe, remove the defective section or full length of pipe, and then install new pipe
- Spot Repair – similar to Open Trench Excavation, crews will dig a small trench, remove a short section of pipe, and install a new section of pipe
- Manhole Lining & Sealing – epoxy or cementitious material is applied to the inside of the manhole as a coating, restoring structural integrity and waterproofing the manhole
When excavation is required for construction, City contractors will pave the impacted area with a temporary course of asphalt immediately following the work. They will then return roughly a year later and perform final surface restoration.