Getting to ‘yes’

Initial plans called for an interceptor 35 to 75 feet in soft ground under high groundwater conditions. Instead, an 18-foot-diameter tunnel bored through bedrock more than 250 feet deep will connect to tunnels along the White River, Fall Creek, Pleasant Run, and Pogues Run (see map on page 34). Photo: Indianapolis Department of Public Works

Construction to double the Belmont plant's secondary-treatment capacity via oxygen nitrification includes converting two unused pre-aeration tanks into two 22-by-247-foot rectangular primary clarifiers. Under Indianapolis' long-term control plan, the project must be operating by Dec. 31, 2012. Photo: Indianapolis Department of Public Works

One major design change – replacing a 12-foot interceptor with an 18-foot deep tunnel running seven miles from treatment plants on the north and south sides of Indianapolis – opened the door to a plethora of tweaks to original long-term control plan designs that are expected to save $740 million, keep an additional 36% untreated sewage from flowing into local waterways, and enable public works to beat the renegotiated 2025 consent decree deadline. Scheduled for completion in 2017 and designed by AECOM, the tunnel holds runoff until one or both plants are ready to process it. Four smaller tunnels will run along four other rivers and creeks. Photo: Indianapolis Department of Public Works

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