Mount Kisco

Water Main Replacement, NYS Route 117

Project Cost:
$10 million

Mount Kisco, located in Westchester County, New York, owns and operates a water system serving 10,000 customers within the municipality and the adjacent towns of Bedford and New Castle. For approximately one mile along busy NYS Route 117 – a major thoroughfare for businesses and for commuters to New York City – Mount Kisco’s water main was a 10” asbestos cement pipe located under the highway. Due to health and safety concerns with continued use of this pipe, the Village decided to replace it, and thereby eliminate the last vestiges of asbestos cement pipe in the water system. As part of this project, in order to ensure that customers had a reliable source of potable water, the Village also chose to replace an adjacent 100-year-old cast-iron main with a history of breaks.

Mount Kisco hired Delaware Engineering to design the replacement of nearly 10,000 linear feet of main with 12” ductile iron water main. Using existing mapping combined with field surveys, Delaware created a 3D model of underground utilities in the area, including major gas, electric and telecommunications trunk lines in addition to sanitary and storm sewers.

For this traffic-heavy area, lined with major employers and serving as a main commuting artery, it was critical to map all utilities and identify potential conflicts, in order to avoid costly delays during construction. Further, to accommodate the public, the work was designed for nighttime construction.

The new water main, complete with main line valves, service valves, and fire hydrants, was installed while keeping the existing mains in service, and with minimal impact to the New York State road and the drivers who use it.

Delaware also assisted the Village with the SEQR process, bond resolutions, Department of Health approvals, WIIA grant applications, and DWSRF loan financing.