Review cuts almost $2M from West Park project

Wilmette officials have asked the Wilmette Park District to let the village place a storage tank to handle sanitary sewer overflow underneath the grounds of West Park, near the Glenview border.  |  Kathy Routliffe/Sun-Times Media
Wilmette officials have asked the Wilmette Park District to let the village place a storage tank to handle sanitary sewer overflow underneath the grounds of West Park, near the Glenview border. | Kathy Routliffe/Sun-Times Media

Sharp eyes, red pencils and value engineering have brought down the expected cost of the West Park sewage storage project from $18.1 million to $16.6 million, Wilmette Engineering Director Brigitte Berger told village trustees Aug. 25.

Berger’s report to the municipal services committee noted that $18.1 million estimate had been a huge jump from pre-project estimates of $12 million, making the most recent downward adjustment welcome news.

The new total covers everything in the project, the largest segment of which is the $15 million guaranteed maximum for all designs, excavation and installation of the 5.5 million gallon tank destined to lie under West Park and serve as temporary storage when west Wilmette sanitary sewers overfill after heavy storms.

It also includes $1.1 million to build a backflow valve to prevent sewage from the Metropolitan Water Reclamation District’s larger flood control system from flowing into Wilmette systems during those storms, as well as a pump station to operate the tank.

Another $1.5 million will rebuild West Park to the Wilmette Park District’s specifications, and a final $1 million covers what village officials expect will cover costs connected to how the project will affect neighboring Glenview.

One major redesign has changed the tank’s shape from relatively shallow and round to deep and rectangular. The change saves money, provides the same storage volume, and will actually provide more excavated soil, which can then be used to build a protective berm along Laramie Avenue to protect nearby residents during construction, Berger said.

During her report, Berger also listed the status of agreements and contracts necessary to get construction started.

The village board was expected to sign off Aug. 26 on the agreement it negotiated with the park district, she said. Board members should be able to approve the final design-build contract – covering the joint-venture team of designer RJN Group and contractor Boller Construction – at their Sept. 9 meeting.

“The schedule is very aggressive,” Berger said. “Actual excavation starts near the end of the year … with construction complete in September of next year. The entire thing should be operational by November of next year.”

BOTTOM LINE

WHAT: value engineering

FOR: West Park storage tank project

OLD ESTIMATE: $18.1 million

NEW ESTIMATE: $16.6 million

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