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Comprehensive Sanitary Sewer Plan City of Arden Hills, MN WSB Project No. 3455-20 Page 1 INTRODUCTION The City of Arden Hills is required to prepare a Comprehensive Plan that aligns with the Metropolitan Council’s Metropolitan System Plan every ten years per Minnesota Rule 473.858. One component of the Comprehensive Plan is the Sanitary Sewer Plan, which describes the existing sanitary sewer system and outlines the timing and sequence of future improvements. The Sanitary Sewer Plan allows the City and the Metropolitan Council to build and improve their sanitary sewer collection and treatment systems in the most efficient and cost-effective manner. The City of Arden Hills is entirely within the 2040 Metropolitan Urban Service Area (MUSA), so sanitary sewer interceptors and treatment are provided by the Metropolitan Council Environmental Services (MCES) system. The City is responsible for local wastewater collection and conveyance, which has historically been self-supporting through fees paid by users. The City of Arden Hills’ Sanitary Sewer Plan was developed to conform to the Metropolitan Council’s Thrive MSP 2040 Water Resources Policy Plan. The Thrive MSP 2040 Plan was approved in May 2015 and outlines regional goals for the wastewater system, including environmental sustainability, water reuse, and water conservation. Additionally, the Thrive MSP 2040 Plan includes population, household, and employment projections, and projected wastewater flows. As a result of projected population and land use changes in Arden Hills, the Metropolitan Council estimates that sanitary sewer flows will increase approximately 19 percent between now and 2040. The greatest increase in flow is expected from the development of the Twin Cities Army Ammunition Plant (TCAAP) site in the north part of the City. This Sanitary Sewer Plan outlines the locations in which the Metropolitan Council can expect to see increased wastewater flows, allowing the Council to determine if capacity upgrades will be required at regional wastewater treatment plants and interceptors. This plan also serves as a guiding document for City infrastructure improvements and expansion.