Pump Station Rehabilitation Program North and South Yonkers Sanitary Sewer Districts

Westchester County
Westchester County, NY

The project work includes the study, design, and construction administration for the rehabilitation of several wastewater pump stations located in North Yonkers and South Yonkers Sanitary Sewer Districts.

The work included rehabilitation/replacement of mechanical and electrical equipment including, but not limited to, pumps, piping, valves, screenings removal, control panels, standby generator, flood mitigation, electrical service, hazardous gas monitoring, structural, architectural, heating, and ventilating, and plumbing systems.

Upgrades were deemed necessary by the client based on equipment reaching end-of-life use. The pump station hydraulic systems were also evaluated to allow efficient pump selection.

A total of four pumps stations are currently being  designed to be rehabilitated. Stations names and the approximate pumping capacities are as follows:

  • Hastings Pump Station – pumping capacity 0.7 million gallons per day
  • Dobbs Ferry Pump Station – pumping capacity 0.3 million gallons per day
  • Ludlow Pump Station – pumping capacity 2.7 million gallons per day
  • Main Street Pump Station – pumping capacity 7.2 million gallons per day

The project goals is to enhance operations for County operators and maintenance staff.  The work includes replacement of all existing pumps, piping, valves, electrical, and instrumentation and controls.   Hydraulic modeling was performed for each station to assist in optimizing pump selection and optimize performance.

Evaluations included incorporating flood mitigation measures previously defined.  During these evalautions, which included age and structural integrity, the client decided to remove the existing superstructure at the Ludlow pump station and rebuild it at a higher elevation to eliminate the potential flooding of critical equipment.

Cost effective approaches to minimize impacts to critical equipment were used at the Main, Hastings, and Dobbs Ferry pump stations.  Approaches included raising building openings, adding flood doors, or raising electrical equipment to higher elevations to minimize impact form flooding.