Project Type: Design Bid Build
Project Owner: City of Chandler
Construction Dates: 7/13 to 4/14
The project consisted of installing 15,700 LF 28” Fused HDPE Force Main and pumping system to pump wastewater from west Chandler to the Ocotillo Water Reclamation Facility within an existing utility corridor along the south side of the Santan 202 freeway. The project also included new pumps and piping at the existing wastewater lift station and a new junction structure to the existing 66” sanitary sewer line. The bypass pumping on this project included a month-long operation of 30 MGD pulling out of an existing 66” RCP sewer line. Close coordination was required between our mainline crews, structure rehabilitation subcontractor, and bypass subcontractor. Additionally, there was a 12 MGD bypass from an existing 36” line, and a 10 MGD bypass for the final lift station tie-in. These required our personnel to work around the clock in order to complete the required work within the contract completion time. One of the more difficult portions of the project included the installation of the HDPE into an existing casing that went under the freeway. The casing was 30 feet deep and was located 10 feet from an existing sound wall. The installation required an engineered beam and plate shoring system for the excavation.