Project at a Glance

• Owner: NYS Department of Transportation

• Client: Halmar International

• Location: Mamaroneck NY

• Work Type: Bypass Pumping

Project Overview

Tri-State Civil Construction was selected by Halmar International to provide the temporary bypass pumping system required for the replacement of an existing 66-inch sanitary sewer crossing beneath the U.S. Route 1 Bridge over the Mamaroneck River. The work was performed as part of the NYSDOT Lower Westchester Bridge Bundle Design-Build Project, a major infrastructure initiative focused on improving flood resiliency, replacing aging bridges, and modernizing critical utilities throughout Westchester County.

The bypass system allowed the existing sewer to remain fully operational while the original crossing was removed and replaced, ensuring uninterrupted wastewater service to the surrounding community throughout construction.

Scope of Work

Tri-State furnished a complete turnkey bypass pumping system, including engineering support, temporary pumping equipment, HDPE bypass piping, installation, operation, maintenance, monitoring, and final system removal.

Working within a dense urban environment adjacent to the Mamaroneck River presented significant logistical challenges. The bypass system was installed while maintaining traffic along Route 1, protecting nearby businesses and residences, and coordinating with multiple ongoing construction activities.

Throughout the duration of the project, Tri-State maintained continuous operation of the temporary pumping system, providing around-the-clock monitoring and rapid response capability to ensure uninterrupted service and safe project execution.

Project Challenges

This project required careful planning and execution due to several unique site constraints:

· Maintaining continuous operation of an active 66-inch sewer.

· Construction adjacent to the tidal Mamaroneck River.

· Limited working space within a busy downtown corridor.

· Coordination with bridge construction, utility relocation, and roadway improvements.

· Maintaining public safety and minimizing disruption to traffic and nearby businesses.

· Delivering a highly reliable bypass system with redundant pumping capacity.

Results