Agenda - Environmental Policy Board - 10/15/2018

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The reserve capacity for future growth with the Ramsey MUSA, therefore, appears to be about 2.2 to 3.2 MGD. Rural Wastewater Management— In areas outside of the existing MUSA, a total of 3,750 households are served by private on -site septic systems and drain fields. Of these, 3,260 are systems that are outside of the current Urban Growth Boundary. The remaining 490, which are located within the Urban Growth Boundary, are earmarked in the Comp Plan to be connected to the MUSA system during phased expansion through about 2015. Approximately half of the 3,750 onsite systems where constructed before 1974 and have not been replaced or upgraded since. The remaining systems are new or have been upgraded since 1974 due to failures or real estate sales. There has been no known or reported groundwater quality issues related to failing septic systems. The City has passed an ISTS ordinance. Future Wastewater Management. As stated earlier, the City's wastewater collection system is divided into two Districts that generally follow a watershed boundary: the Rum River MUSA District and the Mississippi River MUSA District. The City's 2001 Comprehensive Plan identified areas within the City limits that would receive MUSA wastewater service under future planned expansions through 2015. These areas are all within the Urban Growth Boundary. In the Rum River MUSA District Urban Growth Area, future expansion is planned to serve two small areas to the north of 163rd Ave. (Figure 18.2). In the Mississippi River MUSA District Urban Growth Area, future expansions are planned for a fairly large area to the west of Ramsey Blvd., and to the north and south of U.S. Hwy. 10, also shown in Figure 18.2. The RTC Site is located within the Mississippi River MUSA District. It was identified in the City's 2001 Comprehensive Plan, as amended in 2002, for expansion of the centralized wastewater system between 2000 and 2010. In addition to the RTC Site, the plan identified other Urban Growth Areas to the west of the RTC Site with sewer extension occurring between 2000 and 2015. (Note: The selection of sub -districts is solely for convenience in determining current and future design flows and was not intended to correlate with any development timelines.) Methodology: Existing and projected future flows for each District need to be determined in order to consider potential future impacts from the RTC Development. In general, the methodology follows that used in the City's 2001 Comprehensive Plan, as amended in 2002, and estimates future flows for all areas within the Sewer Service Boundary developed in the Sewer Plan (Generally all areas south of Trott Brook). Flows for the areas currently served by the MUSA will be based on the 2001 MCES reported flows as shown in Table 18.2. Flows for the future Urban Growth Areas are based on projected land use and generally follow the procedures developed in the City's 2001 Comprehensive Sewer Plan, as amended in 2002 (A summary of the projected 18-7