Simplifying Sanitary Sewer System for Easier Operations

Problem

The City of Kent had two antiquated pump stations in the southwest portion of their collection system: the Yacavona Pump Station and the Middlebury Pump Station. Both stations were experiencing excessive maintenance failures due to the age of the infrastructure and needed replacement.

Solution

CTI performed a Feasibility Study to determine the best way to combine the two pump stations into one that serves both sewer sheds. CTI designed a new gravity sewer system that transports wastewater from the Yacavona Pump Station to the new 300 gpm, 25 hp submersible pumping station at the existing Middlebury PS site allowing for the abandonment of the Yacavona pump station.

Project Elements

• Hydraulic evaluation to determine flows to the existing pump stations
• Yacavona Pump Station and gravity sewer abandonment
• Replacement gravity sewer located in easement in residential neighborhood
• New submersible Chopper Pump Station design with backup generator inside control building

CTI Services

• Feasibility study and alternative analysis
• Preliminary engineering study and basis of design
• Topographical survey, subsurface/geotechnical investigation
• Pump station and sewer design
• Bidding and construction support services