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* • <br />• Pumping should be conducted during off-peak periods between runoff events <br />(such as after spring snowmelt or in the late fall), since pumping during a <br />large runoff event vrill not appreciably reduce the peak water level in Mooney <br />Lake. Pumping during off-peak conditions will reduce impacts on <br />downstream conveyance systems. <br />• Pumping will likely be needed only every 3-5 years. <br />c. Other Considerations <br />The installation of an outlet in Mooney Lake will require a permit from the Mn <br />Department of Natural Resources. MnDNR area hyi-ologist Ceil Strauss was contacted <br />in March, 1999 to discuss permitting considerations. She outlined the following <br />requirements: <br />• The final control elevation for Me •''ney Lake can be no lower than 1.5 feet <br />below the OHW of 988. Setting the control water level at a higher elevation <br />will be governed by flood risk considerations. <br />• MnDNR’s main concern will be to assure that the discharges from Mooney <br />Lake will not cause flooding problems downstream. Dry weather pumping is <br />a good strategy to avoid potential problems, but MnDNR will require an <br />operating plan that specifies when and how the lift station would be operated, <br />when pumping would cease, etc. <br />• MnDNR has no records of eurasian milfoil infestations in Mooney Lake, so <br />screening of the intake would not be required. <br />d. City Staff Input <br />■ \ <br />On April 2,1999, Minnehaha Creek Watershed District staff and BRA staff met with city <br />representatives from Plymouth, Medina, Orono, and Wayzata to review the information <br />presented above. The purpose of the meeting was to solicit input from city staff in <br />selecting a recommended outlet option for Mooney Lake. Meeting attendees generally <br />supported Option 1. Staff from the City of Wayzata stated that they will need to be <br />shown how the additional water from Mooney Lake will be routed safely through <br />Wayzata.