09/02/2008 Council Packet - Laserfiche WebLink

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• South of 35W and next to George Watch Lake is a large and highly susceptible coniferous swamp surrounded by wooded and shrub wetlands. A small catchment that consists of the large commercial area to the north drains to a treatment pond onsite and then to a pipe under the interstate to a channel that travels through the swamp directly to the lake. The loading to the lake should be investigated. To mitigate the loading, the swamp cannot be an alternative discharge point for the stormwater, without significantly altering the water chemistry and composition of the swamp. The commercial area is underlain by excessively draining sandy soils and thus becomes an ideal opportunity site for investigating onsite infiltration BMPs such as rain gardens and pervious pavement. • To the north of G Street are two catchments. At G Street a channel flows south directly to the lake. Land use north of this should therefore be planned to dissipate runoff into the ground through multiple onsite BMPs. This will avoid additional pressure on the volume- constrained culvert on G Street. The soil in the uplands is well- draining sand. • Opportunities for infiltration retrofit (on site volume control measures) exist within this RMU. A feasibility study that finalizes potential locations and completes a preliminary evaluation of the final sites is the next step in quantifying the potential for retrofit projects in this area. RMP Future Conditions Recommendations: • The high infiltration capacity soils (HSG A) in this area make the RCWD's proposed 2.8 -inch infiltration standard very effective in controlling future runoff in this subwatershed, however, some of the most stormwater- sensitive wetlands are found in this area and will require additional standards to protect them. Planning District 3 Overall Recommendations • Much of District 3 was included in the I -35E Corridor Alternative Urban Areawide Review (AUAR) completed in 2005. This large -scale study analyzed potential environmental impacts of future development over 4660 acres of eastern Lino Lakes (the location of the AUAR area is shown on Figure 2 -5). The analysis included land use, transportation, municipal water and sanitary sewer services, stormwater management, and natural resources. All development within the AUAR study area must comply with the mitigation plan that forms a part of the AUAR. The mitigation plan includes the Conservation Development Framework, which is described in the AUAR and forms the fundamental precept for all development within the AUAR area. The City will continue to implement the AUAR and update it as necessary. • Integrate Clearwater Creek into district and site planning to preserve the natural amenities of this water course. • Encourage the development of the Clearwater Creek Industrial Park. • An area south of 64th Street and northwest of Bald Eagle Lake is guided for permanent Rural Land Use on the Land Use Plan. Figure 10 -7 shows the planned land use for Planning District 3. It is not likely that this area can be economically served with municipal utilities because of extensive wetlands and the minimal amount of developable land. 10 -18 • •