This PVC Pipe News article shows how the Avon Lake Municipal Utility installed a sanitary sewer pipeline inside an existing combined sewer. The result was a separated system. The title is "Avon Lake Municipal Utilities Combined Sewer Separation Project."
Large Diameter 48-inch Storm Sewer
Article reviews how large diameter PVC was used for a storm sewer project.
Shallow Bury
Photo demonstrates how flexible PVC can be used in shallow bury applications.