Contract 20-1: Danvers Siphon Rehabilitation Designed by CDM Smith

To ensure continuous system improvements, the District initiated a condition assessment in 2018 which determined that this siphon rehabilitation project was required. Corrosion caused by the surrounding soils and salt water environment created concern that without this rehabilitation, untreated sewage could enter the Porter River, impacting the environmental ecosystem of the river, creating public health concerns, and impacting recreational uses of the river.

The four siphons are located under the Porter River in the town of Danvers, MA: one ductile iron triple-barrel siphon constructed in the 1970s at River Drive; the other a cast iron single-barrel siphon constructed in the 1920s at River Street. This project used Cured-In-Place Pipe Lining (CIPPL) to fully restore the structural integrity of the pipelines, removing the risk of a pipe failure and potential sewage exfiltration, and providing a minimum 50-year extension of the design life. The use of CIPPL has a low environmental impact and does not require major construction or disturbance to the adjacent residents and environment.

The project was bid and awarded to Michels Pipeline Service to complete the work. This was completed December 2021. This project was funded by the Commonwealth of Massachusetts State Revolving Fund (SRF) loan program.