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VIII. 2001 Comprehensive Plan Amended February 26, 2002 SEWER ELEMENT A. Existing System Sewer Flows The City of Ramsey provides municipal sanitary sewer services to approximately 1,455 residential households and 250 acres of commercial, industrial and institutional development within the current Metropolitan Urban Service Area (MUSA). Two major sanitary sewer interceptors serve the City of Ramsey and its two sewer districts. Regional interceptor connections to the local system occur at the southern end of Dysprosium Street and at the easterly extension of McKinley Street into Anoka (see Figure VIII-l). The two interceptors serving Ramsey currently provide for a combined capacity of 18.1 million gallons of sewer flowage per day. Residential and commercial developments are served primarily by a gravity flow system, which generally flows in a northwest to southeast direction. Due to topographical constraints, two locations, as shown in Figure VIII-1 require a pumping station (called lift stations) to pump sewage to a higher location where it enters the gravity system. The following table illustrates estimated existing sewer flowage by land use category for the two sewer districts serving the City of Ramsey. Table VIII-1 Existing Sewer Flowage~January 1998 Sewer District Mississippi River Rum River Land Use Type Units MGD MGY Units MGD MGY Residential 155 HH .035 12.78 1,300 HH .298 108.78 Commercial 150 Acres .161 58.77 8 Acres .008 2.92 & Industrial Public 3 Acres .003 1.6 90 Acres .1 36.5 & Institutional TOTALS II I.199 I72.65 II I.406 I148.2 MGD: Million Gallons per Day Source: City Engineer MGY: Million Gallons per Year HH: Households o Inflow and Infiltration The oldest municipal sanitary sewer facilities in Ramsey were installed in 1985. Due to the relative newness of this system, little inflow and infiltration is expected to Occur. o On-site Septic Systems A total of 3,750 households are currently served by private on-site sewer systems, 490 of which are currently located within the existing Metropolitan Urban Service Area (MUSA). These systems are generally located on lots greater than one acre in size in order to accommodate two drainfields. Approximately 1,750 of the City's on-site septic systems were constructed prior to 1974 and prior to a time when active construction inspections were required. Since January of 1978, the City has documented that approximately 1,100 of these older systems have been replaced primarily due to homeowners or mortgage companies request and sometimes due to neighborhood complaints. The systems that were replaced were primarily due to bottomless tanks, and not because drainfields ceased to function. There have been 2001 Ramsey Comprehensive Plan Amended February 26, 2002 Page FIlI-1