Title
An Ordinance to Amend Sections 2:42.5 and 2:42.6 of Chapter 28 (Sanitary Sewer) of Title II of the Code of the City of Ann Arbor (Ordinance No. ORD-16-13)
Memorandum
The purpose of the proposed code amendment is to modify the code provision relating to requirements for new connections made to the City's sanitary sewer system. The code amendment will incorporate the City's Developer Offset Mitigation (DOM) Program requirements which were initially established by Council Resolution in 2003.
The City of Ann Arbor created the Developer Offset Mitigation (DOM) Program to protect the health and safety of our community and the environment, using a city-wide approach. The DOM Program was established on August 18, 2003 by Council Resolution R-362-8-03 (and most recently modified on June 15, 2015 by Council Resolution R-15-213) to reduce the potential for development sites to exacerbate sanitary sewer backups or sanitary system surcharging during wet weather rain events. At the time DOM was established, the City was removing wet weather flows from the sanitary system in response to sanitary basement backups that occurred in various locations during large storm events in 1998 and 2000. This effort was mainly implemented through the City's Footing Drain Disconnection (FDD) program, which occurred between 2001-2012.
DOM requires developments that are adding new flow into the City's sanitary system to effect a net reduction in overall flow to the sanitary system. Applicable development projects must mitigate 110% of the estimated net new flow contribution from the development into the sanitary system. DOM aids in protecting the health and safety of our community and environment by not allowing new development to exacerbate sewage collection system capacity issues or "MDEQ permitted" overflows of partially treated sewage by our wastewater treatment plant to the Huron River.
The City recently completed the Sanitary Sewer Wet Weather Evaluation (SSWWE) pr...
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