This work essentially provides a brand new pipe within the existing deteriorated sewer line by a method called cured-in-place-pipe. A polyester resin liner (the yellow material shown in the photos) is pulled through the existing sewer line and is then inverted within the existing pipe and cured with steam in place. A CCTV video inspection is performed both before and after to ensure proper installation.
The rehabilitation work also includes extensive repairs to the manhole. This is performed by a spin casting method using a geopolymer mortar. A "before" and "after" photo of an existing brick manhole is shown below: