The Lower Northwest Interceptor (LNWI) system provides sewer service for the growing northern Sacramento County area and the City of West Sacramento in Yolo County. The pipeline route and overall planning are the result of a cooperative effort among the area’s governments ensuring that the entire region is provided with the highest quality sewer services. The overall program included: two new pump stations, five pipeline projects and 14 tunnel crossings; including two tunnel crossings under the Sacramento River.

EPC served as the prime construction management consultant on the Natomas and Sacramento Force Mains. In addition, EPC served as a subconsultant on the West Sacramento Force Main, providing contract coordination for the Yolo Force Main and start-up coordination services for the total system.

Upon completion of the construction of the system, startup and testing sequences were begun with EPC participation, including developing the operational set points for both pumping stations, developing the set points for the odor control systems at each pumping station, and developing training modules for each subsystem at each pumping station.