Lake Desair Alum Dosage Study - NOR 7_11


Desair Lake Restoration, Inc. a 303(d) listed water for eutrophication, has worked closely with Barron County Soil and Water Conservation Department and DNR over several years to implement best management practices, including gabions and storm water detention ponds, to slow the flow and reduce sedimentation to the lake. In 2009, the lake group received a lake protection grant (LPT) to continue BMP implementation for external nutrient/sediment load reduction, including additional ponds, wetland and streambank restoration, rain gardens, and shoreline restoration. This lake restoration project and funding would determine the dosage, expenses, and implementation plan for an alum treatment to reduce internal loading. Bill James, Army Corps of Engineers, has provided a proposal and cost estimate (attached) for the alum dosing study. Additional funds will be needed implementation plan. The dosing study will occur after the LPT-funded external load reduction BMPs are implemented when, anticipated in 2011. Depending on study results, dosing itself would not occur until 2012 at the earliest.


This project is necessary to build on the success of Desair Lake Restoration, Inc. and its partners at reducing the flow and nutrient inputs to the lake. An alum dosing study and implementation plan will provide information on the feasibility and alum treatment, and if feasible, the guidance for substantially reducing internal loading.


Performance Measures: These are milestones that will be reported on in the Division Quarterly Report. Please estimate dates in a manner that encourages success. 1) Number of sample sites associated with the project. Three 2) Number of sampling events associated with project. One 3) Estimated date when sample collection will be complete. 6/30/2011 4) Estimated date when all data will be entered into appropriate database. 6/30/2011 5) Estimated date when final report will be complete. 6/30/2011

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The work plan proposal and funding would determine the alum dosage and expenses for a possible future alum treatment to reduce internal loading after external nutrient sources are addressed.