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service laterals can also be a source of inflow. Factors that contribute to their susceptibility <br /> include; age, condition, pipe material, construction, soils, and water table elevation. <br /> In the case of infiltration, groundwater seeps into cracked or broken wastewater <br /> pipes. Infiltration is a steady contributor to the problem, causing water that should be filtering <br /> down and recharging the region's aquifers to end up in rivers and flow out of Minnesota. <br /> Misr <br /> nticrvwexcn <br /> The addition of clear water into the local sewer systems creates multiple problems. First, the <br /> additional flow takes capacity that was built to accommodate new development and, in some <br /> cases, the additional flow exceeds the available sewer system capacity. When the capacity of <br /> the sewer is exceeded, the wastewater backs up into basements or spills out of a manhole <br /> causing water quality concerns. Second, the clear water that gets into the wastewater system is <br /> eventually treated and discharged into the rivers, hence lost to Minnesota. Moreover, the <br /> Council charges communities the same rate for its clear water as it does for sewage. Therefore, <br /> communities have a fiscal as well as a public policy reason for ensuring that the total system <br /> functions effectively and conforms to regulations. <br /> Minneapolis, St. Paul, and South St. Paul are communities originally constructed with combined <br /> (storm and sanitary) sewer systems. Because of this, these communities continue to face <br /> additional challenges in eliminating sources of inflow. <br /> I'lliligip 11. <br /> Policy on Inflow and Infiltration: <br /> The Council will not provide additional capacity within its interceptor system to serve excessive <br /> inflow and infiltration. <br /> The Council will establish inflow and infiltration goals for all communities discharging <br /> wastewater to the regional wastewater system. Communities that have excessive inflow and <br /> infiltration in their sanitary sewer systems will be required to eliminate the excessive inflow and <br /> infiltration within a reasonable time period. <br /> Implementation Strategies: <br /> • Maintain and rehabilitate Council interceptors to minimize inflow and infiltration. <br /> • Develop inflow and infiltration goals for all communities served by the regional <br /> wastewater system. <br /> 29 <br />