Title
Resolution to Approve a Professional Services Agreement with Orchard, Hiltz & McCliment, Inc. ($968,348.00) for the Sanitary Sewer System Flow Monitoring and Wet Weather Evaluation Project
Memorandum
Attached for your review and approval is a resolution to authorize a Professional Services Agreement with Orchard, Hiltz & McCliment, Inc. (OHM) for professional engineering and public engagement services for the Sanitary Sewer System Flow Monitoring and Wet Weather Evaluation Project.
As the Footing Drain Disconnect (FDD) Program has been in place for over 10 years, it is appropriate to evaluate and document the effectiveness of the program on reducing the impacts of wet weather events on the City’s sanitary sewer system. This review will allow the city to assess the sanitary basement backup risk that remains in original priority areas, and to identify other areas in the City that may require mitigation of their sanitary basement backup risk. In addition, as advances in technology and wet weather control methodologies have likely occurred over the past decade, it is also appropriate to review, evaluate and recommend the complete range of methods moving forward to further reduce these wet weather impacts.
Within the City of Ann Arbor, there are groups of homes that have experienced multiple basement flooding occurrences. Many of these have been the result of backup of wastewater from the sanitary sewers through basement floor drains. While the sanitary sewer system normally moves all of the wastewater to the Ann Arbor Wastewater Treatment Plant (WWTP), when it rains some of this rain enters the sanitary sewer system and has occasionally exceeded the capacity of the system to move flows to the WWTP, resulting in basement backups. The City of Ann Arbor has taken a variety of approaches in the past to correct these problems with varied success.
A special task force comprised of homeowners, city staff, and experts in related disciplines was established in 1...
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