Ronkonkoma Hub Sanitary Force Main Piping Systems

Suffolk County, NY

Suffolk County DPW

Contract Value:
$27.8 Million

Project Dates:
2018 to 2020

  • Site Drainage and Sewer Contracting
  • Steel Sheeting and Bulk Heading
  • Traffic Control Improvements and Landscaping
  • Asphalt Paving
  • Curb and Sidewalk
  • General Road and Heavy Highway Construction


This project entailed the construction of sanitary force mains and gravity piping systems for the proposed Ronkonkoma Hub Development which traversed through three municipalities. More specifically, it included just under six miles of new 6” and 12” diameter force main piping system with all new piping and associated accessories to provide for the connection of the proposed sanitary pumping stations and the new gravity sewer. It also included 1.5 miles of new 24” diameter gravity sewer with all new piping and associated accessories to connect the proposed force main to existing sewer system. Lastly, the scope of work also entailed roadway rehabilitation following the sewer main installation.


The sewer modification system crossed three municipalities and required the coordination of three crews, while starting the three sections of work simultaneously and working with all the municipalities involved. The layout of the pre-existing underground utilities also created some challenges at times and required the new system to be redesigned to accommodate existent conditions. Lastly, the water table was significantly higher than shown and required a major re-design in order to complete the proposed force main installation.


To maintain the project schedule and maximize efficiency throughout the redesign phase with the engineer and the municipalities, Posillico adjusted strategically where crews were being deployed. In addition, a key solution to the challenges encountered was to raise the elevation of the force main installation. This was accomplished by offsetting conflicting utilities in the area. As always, diligent communication with all the key stakeholders as well as tightly run operations is what allowed Posillico to make this project a success.