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Comprehensive Sanitary Sewer Plan City of Arden Hills, MN WSB Project No. 3455-20 Page 2 BACKGROUND The City of Arden Hills is located in Ramsey County north of the Twin Cities. Arden Hills is bordered by the Cities of Shoreview, Roseville, New Brighton, and Mounds View. Much of Arden Hills is residential, with commercial, industrial, and office development located along its eastern border and Interstate Highway 694. Approximately 11 percent of the area of the City is occupied by lakes and wetlands. Arden Hills has been designated entirely as a suburban community. This designation indicates that the City experienced continued growth through the 1980s and 1990s. The Metropolitan Council expects Arden Hills to, “plan for forecasted population and household growth at average densities of at least 5 units per acre for new development and redevelopment … and to target opportunities for more intensive development near regional transit investments.” EXISTING SANITARY SEWER SYSTEM The City of Arden Hills’ sanitary sewer system is a collection system only, as described previously. The existing sanitary sewer system is shown in Figure 1. The system collects and conveys the City’s wastewater to five MCES Meters (M051, M052, M054, M059, and M203) and their associated MCES Interceptors (1-RV-432, 1-RV-432, 1-RV-431, 2-NB-100, and 4-NS-524), as shown in Figure 2. MCES Meter M203 does not currently receive flow from Arden Hills, but is planned to receive future flows from the TCAAP development. All of the wastewater collected in the City of Arden Hills is conveyed through the MCES system to the MCES Metropolitan Wastewater Treatment Plant (WWTP) located southeast of St. Paul on the Mississippi River. The Metropolitan WWTP has a capacity of 251 MGD, provides advanced secondary treatment with chlorination/dechlorination, and discharges treated effluent to the Mississippi River. It also generates energy from the residual biosolids for in-plant use. Service Districts The sanitary sewer system has been divided into eighteen (18) sewer districts. These districts, shown in Figure 2, correspond to the fourteen (14) lift stations, two existing gravity networks (MCES 54, MCES 59), and two future networks for the TCAAP development (North, South). The Arden Hills Army Training Site (AHATS) discharges via a private forcemain into district MCES 59. Gravity Sewer The City of Arden Hills’ gravity sewer system consists of 8-inch to 21-inch diameter polyvinyl chloride (PVC) pipe, reinforced concrete pipe (RCP), vitrified clay pipe (VCP), and cured-in- place pipe (CIPP). Nearly the entire system has been televised over the last twenty years, and approximately one quarter of the pipes in the system have been lined over the last fifteen years.