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City of Arden Hills – 2030 Comprehensive Plan Approved: September 28, 2009 E-7 interceptor district. The details of the land use and projected sewage flows by sewer district for years 2015 (No TCAAP development) & 2030 (Full TCAAP build-out) are included as Attachments E2 and E3. A map illustrating the underlying land use for each sewer district is shown on Figure E.5. 8. INDIVIDUAL SEWAGE TREATMENT SYSTEMS (ISTS) Nearly all properties in the City of Arden Hills are connected to the sanitary sewer system. There are currently only four (4) individual sewage treatment systems (ISTS) in the City of Arden Hills. The following four properties have private Individual Sewage Treatment Systems (ISTS):  5400 Highway 8 (State of Minnesota facility)  5420 Highway 8 (State of Minnesota facility)  3233 Snelling Avenue (private residence)  1680 Oak Avenue (private residence) These addresses are shown on Figure E.1. The two State of Minnesota properties are exempt from City requirements. TCAAP includes a proposed sanitary sewer extension to State of Minnesota facilities to allow for a future connection to public sewer and abandonment of ISTS. The two private residences are nearly 700 feet and 600 feet, respectively, from the nearest sewer line but are subject to all City regulations and Minnesota Rules Chapter 7080. The City Code requires structures with on-site septic systems to connect to the municipal sanitary sewer system within two years of sewer service being made available. The City Code should be updated to the minimum Ramsey County Ordinance standards and include the following ISTS regulations:  Require inspections and/or pumping every three years;  Require repair or replacement of failing systems within five years;  Require replacement of a system that poses an imminent public health or safety threat within ten months; and,  Develop an enforcement system that addresses failing systems or systems found to be an imminent public health threat. Since the City has only two ISTSs under its jurisdiction, a full tracking and notification database is not needed. 9. INFILTRATION/INFLOW (I/I) The Metropolitan Council Environmental Services (MCES) Water Resources Management Plan includes policies for reducing inflow and infiltration into the region’s sewage treatment system. The MCES has projected significant growth in the metropolitan area by 2030. This increase, along with current levels of inflow & infiltration (I&I) in the system, would require significant, costly increases to expand the existing MCES treatment facilities to meet the future wastewater flows. As a result, MCES has implemented an I&I surcharge program.