Next Step for Flood Mitigation Project Is Drilling Underneath Midland Avenue

By Carol P. Bartold
Dec. 21, 2016: The next major construction link in the flood mitigation project, drilling underneath Midland Avenue, was scheduled to begin this week, according to Village Administrator Jim Palmer. However, the boring machine to be used encountered unforeseen rock on a job in Ossining. At this time, Palmer is uncertain if that situation will cause a delay in Bronxville.
The auger drill, along with steel casings that will house pipes, have been visible on the Bronxville Library lawn.
When work begins, the boring machine, with the auger drill attached, will bore 20 feet below Midland Avenue from the library campus to the excavation pit at the elementary school parking lot. This section of pipe will link piping already installed under the library and village hall campuses.
Drilling, which will not necessitate the closing of Midland Avenue, will take place underneath existing stormwater mains and utilities. The process will ram the steel casings through the soil. At the same time, it will remove soil to the excavation pit. Palmer stated that the machine will bore approximately 20 feet per day. A total of ten steel casings will be installed.
As the pipes are inserted into the steel casings, they will be welded in place
Dan Carlin, assistant superintendent for business at The Bronxville School, noted at the December 15 Bronxville Board of Education meeting that drilling can proceed during winter weather as street-level freezing will not affect the soil 20 feet below the surface.
The last section of piping, Palmer said, will be installed from the excavation pit to the wet wells at the pump house on Hayes Field at the school.
The Federal Emergency Management Agency (FEMA) Midland Valley Drainage Project is designed to remove excess floodwater from The Bronxville School and surrounding low-lying neighborhoods and carry it to Laurel Brook, near Palumbo Place, where the water will ultimately flow into the Bronx River.
Pictured here: Pipes on the lawn of the library soon to go under Midland Avenue.
Photo by C. Bartold








