2004-10-26_PWETC_AgendaPacket - Laserfiche WebLink

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We have attached a copy of the executive summary ofthe Inflow/Infiltration Task Force Report for your review. A full copy of the report can be found at: http://www.metroconncil.org/environment/ProiectTeams/I- I-Report.pdf The final section of the report discusses the authority, conclusions, and recommended actions. The most significant action is that the MCES has given Cities with excessive III nntil2015 to reduce their contribution of clear water into the system. After which, cities still in violation will be charged an additional wastewater rate demand charge on all metered flow. These Cities will also not be permitted to increase, through redevelopment or development, their discharge of sanitary sewer into the system. This could have a significant financial impact to the City of Roseville. It could impact our sanitary sewer rates as well as property owner's ability to reinvest in the City. Issues: Due to the costs and regional implications, the City has placed a high priority on the prevention, detection, and control of water infiltration and inflow into public sanitary sewer system. All new municipal systems constructed within the City must be designed and installed in accordance with the standard specifications prepared by the City Engineer's Association of Minnesota (CEAM). All private sewer services are inspected by the City for compliance with the Uniform Plmnbing Code. Like other first-ring suburbs, the City acknowledges that the infiltration and inflow problem in Roseville is related to the age ofthe structures built in the city, the age ofthe sewer system itself, and localized areas of high ground water. To reduce the amonnt of infiltration and inflow into the sewer system, the City: · Prohibits the discharge of any roof drainage, storm water, surface water or groundwater into the municipal sewer system. · Evaluates the mnnicipal sewer system and manholes as part of road reconstruction projects. · Annually televises the sewer system to determine if and where repairs are needed. · Actively uses pipe relining and other trenchless technologies to rehabilitate segments ofthe sewer system; The City's Public Works Department maintains a budget to facilitate the televising, inspection and repair of problem areas throughout the existing system. Manholes in low areas where inflow is suspect have chimney seals installed to reduce inflow concerns. In conjunction with the Roseville Pavement Management Program, the City systematically inspects and televises all sanitary sewer systems within the proposed reconstruction area and includes any necessary repair in the improvement project. In spite of all of our effort over the last 20 years, the City of Roseville still has III entering the sanitary sewer system. As discussed in the Taskforce Report, cunently it is estimated that after a rain event the City's flow into the interceptor is 1.7 times our allowed limit. Staff believes that this is the result of illegal private connections of roof and floor drains as well as draintile systems to the sanitary sewer. Discussion: In order to meet the 2015 deadline established by the Met Council. We need to detennine how the City ofRoseville should proceed with a program to reduce the City's 1/1 to meet MCES goals. We anticipate that we will need to develop policy as well as ordinances to implement a new program for the City, and look forward to having the Commission's input. Recommended Action: Discuss policy issues and implementation plan.