09/02/2008 Council Packet - Laserfiche WebLink

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Approximately 75% of the Mixed Use area is expected to accommodate residential development at approximately 8 units per acre. Resource Management Recommendations The resource management recommendations for Planning District 2 are shown on Figure 10 -6. The specific resource management recommendations for Marshan, Rondeu, Rice Lake, and George Watch Lake RMUs follows. Marshan RMU Existing Conditions Recommendations: • There are many sensitive water level points along the ditch branches in the western part of this subwatershed (see Figure 10 -6). Runoff management in this area is a pipe, pond, and ditch system. To alleviate the potential flooding without increasing downstream discharge of urban hydrology to Marshan Lake, onsite volume controls should be evaluated. Numerous small catchments comprise this area, making it ideal for addressing individual, small areas independently. The soils in these neighborhoods are well drained and suitable for infiltration. • The downstream end of the ditch system is within an urban landscape. Pipes in this area are functioning under high rainfall events. The nutrient loading to Marshan Lake will need to be investigated as part of TMDL implementation. One option will be to investigate the functioning of the wetland on the north side of Lake Drive NE. Downstream of this the channel flows within a sandy drainage way, and additional investigation is needed on the potential for expanding storage and nutrient retention and removal from the existing loads. There is no large area available for ponding and load reduction at the end of the ditch, and so it may be that upstream redevelopment BMPs may be the best solution. • Wetland mitigation banking is very feasible in the upper branches of the 10 -22 -32 ditch system. This area is one of the highest concentrations of fully drained wetland in the City. RMP Future Conditions Recommendations: • Anoka County Ditch 10 -22 -32 conveys the majority of the flow to Marshan Lake. This ditch has issues that could be resolved by modifying culverts in catchments MAR -059, MAR -108, and MAR - 110. None of these locations are overtopping paved roads, so the culvert modifications are not urgent. • There is a large area in northwest Lino Lakes that is primarily used for sod. This area is guided to be developed into low, medium and high - density residential housing while incorporating some mixed use. This area has significant opportunity for wetland restoration credit and flexibility in design due to lack of priority natural resources. In addition to addressing volume effects, the design can incorporate an open space connection between Columbus and Blaine as preferred in the DNR Metro Greenways corridor. DNR grants are potentially available for lands located within the DNR Metro Greenway Corridor. 10 -14 • • •