Novel Approach for Trunk Sewer Rehabilitation

Wastewater from the coastal areas of the City of Huntington Beach are conveyed to the Orange County Sanitation District's Treatment Plant No. 2 through a 1350 mm/1800 mm/2100mm PVC (Polyvinyl Chloride) lined RCP (Reinforced Concrete Pipe)sewer. The sewer was constructed in the early 1980's to service an area that included residential development at the north end that did not occur due to overwhelming environmental issues. Since then, the sewer has conveyed substantially lower flows and the portion of the sewer not lined with PVC has been exposed to corrosive sewer gases and has corroded.This project included a full evaluation of the condition of the sewer and looked at alternatives for repair. Ultimately, the course of action included a unique solution that allowed the line to be rehabilitated with a minimum of impact and disturbance to surface improvements including hotel resorts and beach activities particularly during the summer.