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<br />.. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Proposed Capital Improvements/Operations and Maintenance <br /> <br />A permanent pumping station is proposed to control the lake elevation. Pumping would <br />be coordinated with the DNR and would be dependent on the elevation of the lake and <br />the season. <br /> <br />The proposed permanent solution would include constructing a concrete pump manhole <br />on the south end of Karth Lake in Cummings Park and connecting a 6" forcemain from <br />the pump to the storm sewer system on Femwood Avenue. It is proposed that this will be <br />an electrical sump pump mounted on a floating raft with a built in fish screen, which <br />could be manually operated when necessary. <br /> <br />The City of Arden Hills would coordinate with the DNR to determine appropriate <br />minimum and maximum levels for pumping based on Lake Elevation and time of year. It <br />is proposed that a permanent pump would pump no more than 360 gpm (less than 1 cfs.) <br />At 360 gpm it is anticipate that it will take 2- 1/2 to 3 weeks to draw the Karth Lake <br />Down 2 feet (approximately 10 mgal.) <br /> <br />The city would base the commencement and cession of pumping on the following <br />criteria: <br />1) Pumping will not commence if the Lake Level is 934 ft or lower <br />2) April through September pumping would commence when the lake level <br />reaches 936 feet and would be stop once the Lake reaches an elevation of 936. <br />3) October and November pumping would commence when the lake level <br />reaches 935 or higher and would stop once the elevation reaches 933. <br />4) No pumping is anticipated during the months of December through March <br />5) During pumping operations the Lake Level readings will be check daily. Lake <br />Levels will be monitored on a weekly basis otherwise. <br />6) Pumping would not begin without prior notification to the DNR and Rice <br />Creek Watershed District. <br />7) During pumping operations down stream waters and conveyances will be <br />checked to ensure the pumping operations is not causing adverse down stream <br />effects. <br /> <br />The flow rates would be low enough that the impacts to the down stream system would <br />be negligible. Karth Lake is considered to have good water quality and no adverse <br />impacts to the down stream waters are anticipated as result of proposed pumping of Karth <br />Lake. <br /> <br />Cost Estimate and Proposed Funding <br /> <br />The proposed pumping station installation is estimated to cost approximately $70,000 and <br />if approved would be installed and operational this fall. It is proposed that the cost of the <br />