Agenda - Council - 12/15/2020 - Special

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The Plan provides sanitary flow projections in 10-year increments. The rationale for the projections is given in the Plan and determined appropriate for planning local services. The Metropolitan Council is committing to provide the level of wastewater service based on the sewered forecasts as stated in the sewer element of the Plan. The Land Use Plan reflects an overall minimum residential sewered density that is consiste nt with Council policy for future sewered residential growth for Emerging Suburban Edge communities. The Plan defines the community's goals, policies, and strategies for preventing and reducing excessive inflow and infiltration (I/1) primarily in the local municipal (City) sanitary sewer system. The Plan includes a summary of activities and programs intended to mitigate I/1 in the public collection system including inspection, evaluation and mitigation. The City's program includes a televised inspection program whereby 10% of the City's total system is inspected annually. Any I/1 issues that are discovered from the inspection are corrected. Follow-up work includes addressing leaking joints, collapsed pipe and leaking manholes. The Plan characterizes that less than one percent of the homes within the City were built prior to 1970, and that half of those private services have been evaluated for I/I susceptibility. The Plan infers that 1/1 from private property sources is not significant and does not reflect an y evaluation or mitigation efforts in this portion of the collection system. The Plan describes the requirements and standards for minimizing I/I and references City Ordinance (92-05) that prohibits the connection of sump pump, rain leaders, or passive drain tile from the sanitary sewer system and requires those that exist be disconnected. The Plan also states that the City has adopted the Minnesota State Building Code, which states that storm sewer systems shall not drain into sewers intended for sanitary sewage only (471 5.2700). The Plan describes the sources, extent, and significance of existing I/I within the private property collection system and provides a description of an implementation plan for preventing and eliminating excessive 1/1 from entering the public collection system. The Plan states that less than one percent of the total residential households within the City have clay tile services and suggests that very little I/1 within the City originates in the private collection system. Using an unspecified methodology, the Plan suggests that as little as 1,000 gallons per day, or 0.001 million gallons per day originates from all private property sources. The Plan does not provide an estimate for I/I that originates in the public collection system. Comprehensive Sewer Plan Comments The Sewer Element of the Plan has been reviewed against the requirements for Comprehensive Sewer Plans for Emerging Suburban Edge communities. It was found to be complete and consistent with Council polices. Upon adoption of the Plan by the City, the action of the Council to approve the Sewer Plan becomes effective. At that time, the City may implement its Update to alter, expand, or improve its sewage disposal system consistent with the approved Sewer Plan. A copy of the City Council Resolution adopting its Plan needs to be submitted to the Metropolitan Council for its records. Advisory Comment 1. The Plan references two previous studies related to wastewater system planning and system evaluation efforts. A 2012 Comprehensive Update Study, and a subsequent Bolton & Menk 2016 update to that study. A portion of the 2016 Update was provided in Appendix B. The City shall include full version copies of both studies within the final fully adopted Plan that is to be submitted to the Council after local adoption. Page-7 I METROPOLITAN COUNCIL