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Lino Lakes Outlet Study January 22, 2015 Page 3 K:\02029-790\Admin\Docs\Outlet Alternatives Memo_Sequencing.doc Western Pipe Option 4. Option 2 in the western parcel would skirt north around a large wetland and continue to Peltier Lake. Option 4 in the western parcel would skirt south around a large wetland and continue to Peltier Lake. The large wetland in the west central portion of the parcel could be avoided by both options. Benefits of this option: • Minimal temporary wetland impacts anticipated with pipe placement. Because a pipe would be used, no secondary impacts resulting from lateral effect area expected. • No impacts to Wetland Preservation Corridor. • Can easily drain north and south sections of western parcel. Drawbacks of this option: • Western parcel property owner prefers an option that utilizes more of the low land to the south of the parcel. o Option 4 utilizes more low area than Option 2 Alternative 3: Western Pipe Option 3 (Southern pipe): Through the Eastern Parcel, the pipe could use Eastern Pipe Option 1 or Eastern Pipe Option 2 and connect under 20th Avenue to Western Pipe Option 3. Eastern Pipe Option 2 is likely the more appropriate option in the eastern parcel. The pipe would travel south along 20th Avenue to near the southern border of the parcel and then move west/northwest through the narrowest portion of the wetland located in the southeast corner of the parcel. The pipe would outlet to Peltier Lake. Benefits of this option: • Utilizes the low areas of the parcel (landowner preference). • No permanent impacts to Wetland Preservation Corridor. Drawbacks of this option: • Results in at least 9,165 sf of temporary wetland impacts. • Less direct connection to the outlet at 20th Avenue. Preferred Alternative: Based on the alternatives analysis, WSB & Associates would recommend using Alternative Eastern Pipe Option 2 in combination with Western Pipe Option 2 (Figure 3). As described above, this alternative allows for both the north and south sections of the western parcel to be drained and avoids wetland impacts.