Welch Comer Engineers

H-1(D) Sewer Lift Station

Hayden, Idaho

PROJECT OVERVIEW

Welch, Comer & Associates, Inc. performed preliminary engineering, design, bidding, and construction management for the HARSB H-1(D) Sewage Lift Station. The H-1(D) Lift Station was designed with two factory base mounted 8" diameter Gorman-Rupp pumps with 60 horsepower electric motors.  In order to expedite the project schedule, Welch-Comer recognized the pumps' long lead-time and produced a separate equipment procurement contract.

The lift station design provides the capability of upgrading to 10" diameter pumps in the future when additional inflow requires greater pumping capacity.  The lift station is equipped with a 25,000 gallon wet well with an adjoining 50,000 gallon holding basin provided for emergency storage.  During a power outage or pump failure the holding basin provides enough storage to hold peak flow for one-hour. 

Additional features of the lift station include an overflow that allows sewage to flow into the gravity sanitary sewer main and on to a neighboring lift station. A pressure transducer monitors force main pressures and controls the pumps’ cycle in coordination with a neighboring lift station. A Milltronics system controls the pumps along with a backup float system. Two ultrasonic flow meters, installed at a neighboring lift station along with new piping and valves, allow either of two lift stations to be pumped through either one of two local force mains for operational flexibility.

KEY ELEMENTS

• Preliminary Engineering Report Outlining Design Criteria Options with Technical Recommendations
• Overflow to Prevent Spilling
• Pressure Transducer for Proper Operating Sequence
• Existing Piping and Valves Reconfigured to Allow Flow from Two Lift Stations to be Routed Through Either of Two Force Mains

H-1 (D) Control Building and automated carbon odor control building.

 

H-1(D) Gorman-Rupp duplex suction lift pumps.