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Background on the treatment c/o Paul Kretsch,Lake Restoration: <br />The proposed treatment of Eurasian Watermilfoil(EWM)with Fluridone is a whole-lake treatment <br />targeting ALL milfoil growth in Silver Lake.Fluridone is safe for people,pets,wildlife and fish <br />and carries no water-use restrictions at the proposed application rate of 2-4 parts per <br />billion(ppb).The reason for this treatment proposal is that EWM growth has impacted over 40% <br />of the lake in recent years.The DNR typically only allows us to treat up to 15%of the lake for <br />invasive species.If there is approval for this whole-lake treatment,we will work with the DNR on <br />a variance letter to allow whole-lake treatment. <br />Whole lake fluridone treatment will: <br />●Be applied early in the season(May)and work to inhibit the photosynthesis of EWM, <br />limiting growth. <br />●Provide complete control of all EWM within the treated water.No active EWM growth in <br />Silver Lake by 60-90days post treatment. <br />●Selectively control Eurasian Watermilfoil,while having minimal/no impact on native plant <br />growth. <br />Whole lake fluridone treatment will not: <br />●Impact algae growth <br />●Impact water clarity <br />●Impact fish/wildlife/invertebrates <br />Definitions related to the proposal: <br />Thermocline:Boundary layer above which is general mixed and moving water,below which is <br />cold dense water.The water above and below the thermocline do not mix with eachother. <br />Rice creek Watershed District observed a thermocline at 10-15feet starting in May last year. <br />Epilimnion(epilimnetic):The volume of water above the thermocline. <br />This is ~70%of the water in Silver Lake <br />The proposal is based on the likelihood of observing a thermocline again in 2024,and only <br />needing to treat ~70%of the water.It is possible for whole-lake mixing to occur which would <br />necessitate us using ~30%more fluridone to achieve the desired dose.The proposal outlines a <br />cost of $21.00 /oz fluridone beyond the scoped delivery.This would be necessary in the <br />scenario of whole-lake mixing,and could add $2,500+to the delivered cost of the treatment <br />beyond the $11,470.(Not expected). <br />This is a very good management proposal for high occurrence of EWM.It has been discussed <br />with the MN DNR,Rice Creek Watershed District,Three Rivers Park District,Silver Lake <br />Association,and Lake Restoration.