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City reports breakthrough on Rack 32 tunnel; mainline 16.5‑ft tunnel begins tunneling toward river
Summary
City engineers reported a successful breakthrough of the 10‑ft‑diameter Rack 32 interceptor tunnel (about 2,000 feet) and noted that the larger 16.5‑ft mainline tunnel mining beneath Riverside Drive has just started; tunneling schedules estimate the mainline will finish this fall.
City storm‑water staff updated the Public Service Committee on progress in two tunnel projects that are part of the north‑side interceptor work to control combined‑sewer overflows.
Staff presented a breakthrough photo and described Rack 32, a 10‑foot outside‑diameter, roughly 2,000‑foot tunnel completed through soft ground. "This is a 10 foot diameter…
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