Main Street WWTP Improvements – Clarifier #2 & Lift Station

CobbFendley was responsible for design services and construction administration of the Main Street WWTP Improvements. This project included removal and replacement of the existing Clarifier #2 mechanism and inspection of the feed line from the aeration basin to the clarifier. The work also included rehabilitation of the on-site Main Street WWTP Lift Station that included evaluation, bypass pumping recommendations, piping modifications, cementitious liner, and epoxy liner.

Due to the age of the mechanism and the accumulation of disposable wipes and other trash in the sewer system that eventually travels to the wastewater plants, the clarifier mechanism for Clarifier #2 at the Main Street WWTP, had not been performing correctly and needed extensive regular maintenance. Because the Main Street WWTP has two clarifiers, it was possible to complete removal and reconstruction of the clarifier’s internal equipment without shutting down the plant, but it could not be down for an extended time. Because of this, extensive planning was required to ensure precise measurements were taken for replacement of the equipment in a timely manner.

The lift station was originally intended to have a wet well and a dry well, then was expanded by cutting holes in the wall that separated the two. The manhole access to one of the wells was then paved over at a later date. This project was intended to inspect both wells after cleaning to determine if structural repairs were needed and what coating was needed to extend the overall life of the lift station. After the inspection, a coating was recommended, and air vents were installed. The lift station piping was also replaced as part of this project.