Engineering

Southside Interceptor Sanitary Diversion Project

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May, 2020 Update

Work on this project has now resumed.  The Contractor has re-installed the road closure of Fuller Street between Glen Court and the Fuller Road/Fuller Street/Glen Avenue Intersection effective May 6, 2020.  This closure is the same as was put in place in Spring/Summer 2019.  Please see the project webpage for a map of the detour route for the project.

The scope of this project remains unchanged.  All previously planned work for this project will be undertaken as originally planned. 

We expect that the project will be completed in late-August 2020.​

​Project limits

Fuller Street between Glen Court and the Fuller Road/Glen Avenue/Fuller Street intersection.

Timeline

Expected Start of Construction: May 6, 2020

Expected Completion of Construction (Roadway Re-opened to Traffic):  August 19, 2020

Final Project Completion:  September 18, 2020​

​Why is this project being done

This project is being undertaken to divert excess sanitary sewer flow from the Southside Interceptor Sanitary Sewer (the major trunkline sewer that services a large portion of downtown and the westerly side of Ann Arbor) into the Northside Interceptor Sanitary Sewer. The diversion of the excess flow will eliminate sanitary sewer overflows during heavy rain events and reduce environmental damage from the overflows.

Work to be done​

The project will construct a 14' long x 12' wide x 12' tall, cast-in-place concrete, underground chamber that will divert excess flows by the use of a weir within the chamber.  The weir will be adjustable in order to accommodate future changes in sanitary flow patterns in the upstream sanitary sewer. The top of the underground chamber will be about 12' deep and its bottom will about 25' deep.  In order to construct this chamber, it will be necessary to excavate an extremely large hole within Fuller Street and the slope leading down to the railroad right-of-way.  As part of the work, it will also be necessary to relocate a portion of an existing 12" water main and a 24" diameter sanitary sub-main in the vicinity of the diversion chamber. 

Possible Impacts to residents​

Due to the nature of the construction and the needed location of the diversion chamber, it is not possible to maintain through traffic along Fuller Street during the work, therefore a deto​ur (PDF) will be in place. However, access to the U of M Parking Structure, as well as the residential housing units along Glen Court will be maintained to Fuller Street.  Glen Court traffic will be able to enter and exit from west of the project area.

Pedestrian traffic along the southerly side of Fuller Street will be maintained at all times. Access along Depot Street will be maintained to all local area businesses, Wheeler Park, and the Amtrak Station.

A detour route for Fuller Street traffic will be utilized as shown on the attached drawing. The project will also utilize portable, changeable, message signs to provide additional information and way-finding assistance to users of the area.

Information regarding the project has been communicated with Michigan Medicine representatives, emergency responders, and AAATA.  We are working with them to help minimize impacts and delays due to the Fuller Street closure.

This project will generate dust, noise, and inconvenience.  We apologize in advance for this unavoidable impact, but we will take all practicable steps in order to minimize these issues.

Costs and Funding Sources

The total cost of the project is expected to be about $1,734,000 and is being funded from Developer Offset Mitigation funds. 

Documents




 







​Michael Nearing
734.794.6410 ext. 43635 
Larcom City Hall
301 E. Huron St., Fourth Floor
Ann Arbor​, MI 48104
mnearing@a2gov.org​