Hot Tap Hero

IDOT I-90 Hot Tap

TDW Services retained GRAEF to provide Resident Engineer and quality control services for the hot tapping of a 30-year-old 90-inch water main owned and operated by the Northwest Suburban Municipal Joint Action Water Agency on behalf of the Illinois Tollway. This project will allow for the widening of I-90 through the western suburbs.

“Hot tapping” involves cutting a coupon from the water main, installing a line plug and diverting the flow to a temporary bypass line under the operating pressure of the line (165 PSI). The final connections to the rerouted section of the water main are then completed without interruption in water service. A massive thrust restraint system consisting of deep foundations (4-foot drilled caissons, 80 feet in length) and a 600-cubic-yard connecting concrete block within a 22-foot deep earth retention system is required to be in place before the hot tapping is initiated.

GRAEF was involved in site safety, construction observation, scheduling, layout verification, coordination with adjacent contracts, and the CCM for the I-90 widening. Duties include daily reports, liaison with the structural design engineer and TDW representatives, coordination with project sub-contractors and addressing the documentation requirements of the Illinois Tollway, including e-builder submittals, processes and CAPTURE documentation.

Other Projects

Parkhaven at Pike Place

Parkhaven at Pike Place

Drexel Town Square Wetland Park

Drexel Town Square Wetland Park

WisDOT Grantosa Drive Bridge Rehabilitation

WisDOT Grantosa Drive Bridge Rehabilitation

Covered Bridge Road Bridge Reconstruction

Covered Bridge Road Bridge Reconstruction

Urban Ecology Ephemeral Pond

Urban Ecology Ephemeral Pond

Kinnickinnic River – Pulaski Park

Kinnickinnic River – Pulaski Park

Location

Des Plaines, IL

 

Project Data

90-Inch Water Main

 

GRAEF Services

Construction Management

IDOT I-90 Hot Tap Contact

Pete Johnston

Pete Johnston

Office Leader - Chicago,
Sr. Transportation Engineer 

Leave a Comment

You must be logged in to post a comment.