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I I I I I I I I I I I I I I I I I I I provisions of Minnesota Rules 7080. . Development agreements require that the property must be connected to City sewer when it. becomes available. The recent adoption of Ordinance #89- 16 rescinded former provisions permitting alternative, non-septic tank and drainfield, provisions for sewage disposal except for limited application of holding tanks on properties within the year 2000 MUSA boundary where use of properly sized holding tanks is a temporary cost-effective measure until sewer is extended. Residential Lots The standard land area required for a primary on-site system and an alternate system is approximately 11,000 square feet by County Ordinance. The City requires a minimum of 27,225 square feet of Class I soils for a lot to be considered developable. Commercial Commercial lots must have sufficient area for the building as well as the primary and two replacement septic systems. Critical and Scenic Rivers Areas The City has established ordinances which regulate building activities in the Shorelands and Mississippi River Critical Area District as well as a Scenic River Ordinance. The Shorelands and Critical Area District regulates building along the Mississippi River and protected waters in the City. The Scenic River Ordinance regulates building along the Rum River. Anoka County has jurisdiction over septic systems in the Shoreland Ordinance area which includes the Rum River. Flood Plains The City does not allow soil treatment areas to be placed in flood plains delineated by local ordinance adopted in compliance with the State-wide Standards and Criteria for Management of Flood Plain Areas in Minnesota (Minn. Reg. NE 85-93), or in areas for which regional flood information is available from the Department of Natural Resources. Septic System Replacement Policy The policy of the City to protect public health and the environment by requiring prompt repair and replacement of failed septic systems with properly designed and installed septic systems. Correction of failed septic systems is by replacement of individual sewage treatment systems (ISTS). Each replacement ISTS on the affected property must conform with current standards. IX. SANITARY SEWER SYSTEM Sanitary Sewer Systems Figure 13 shows existing sanitary sewer systems as of 1990 and indicates the proposed development schedule for extending sewer in the 2000 MUSA. Each area is identified alphabetically and can be cross-referenced to Table 17 and 18 for year 2000 projections and Table 17A and 18A for 2010 projections. Table 17 provides a projection of wastewater flows for the Mississippi River Watershed through the year 2000. As indicated on Table 17, residential flow in this watershed is relatively low with a projected ultimate flow of 1.199 million gallons per day (mgd). This 32