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Activity <br />Phase <br />Estimated Cost <br />Comments <br />Conduct <br />2 <br />$1,500 - $2,500 <br />Decomposition of the barley straw generates <br />experimental in- <br />for straw plus <br />natural algal growth inhibitor. This technique <br />lake treatment <br />labor to install <br />has been used with some success to control <br />with barley straw <br />in lake <br />algal blooms in small lakes and ponds, <br />managing the symptoms of the problem rather <br />than addressing the causes (i.e., high nutrient <br />loading). It is of low enough cost, however, <br />that it may be appropriate to try it and see <br />how it works on Bennett Lake. Appropriate <br />initial dose is 200 -400 lbs /lake acre (2.5 -5 <br />tons of straw total). <br />Control curly leaf <br />2 <br />$800- <br />Curly leaf pondweed is an exotic invader that <br />pondweed <br />$2,500 /yr <br />degrades water quality during the summer <br />recreation season. Options for control are <br />periodic harvesting or herbicide treatments. <br />Emphasis should be to control clpw while <br />promoting growth of native submergent <br />macrophytes. If harvestor is used, landing <br />may have to be constructed, presumably with <br />City staff labor. <br />Treat runoff from <br />2 <br />$1000- <br />Possibilities include creating rainwater <br />high priority, <br />$15,000 /site <br />garden/filtration bed to catch and treat runoff <br />highly maintained <br />plus <br />from athletic fields west of Lake. Conduct <br />pervious areas in <br />maintenance <br />assessment to evaluate feasibility <br />direct drainage <br />g <br />(engineering, suitability of soils, etc.), <br />estimate specific costs. <br />Treat runoff from <br />3 <br />$2000 - <br />Possibilities may be Central Park parking lot <br />high priority <br />$50,000 /site, <br />west of Lake and Lexington Avenue. <br />impervious areas <br />plus <br />Treatment would utilize sub -grade swirl <br />in direct drainage. <br />maintenance <br />concentrators or equivalent, possibly <br />discharging to filtration /infiltration feature. <br />Conduct feasibility study to evaluate physical <br />feasibility, estimate specific costs. Flat pipe <br />grades a potential problem. <br />Modify priority <br />3 <br />$10,000 - <br />Ponds BL -4, BL -5, and WP -1 look like <br />upstream ponds to <br />$20000 <br />candidates. New ponding in direct drainage <br />increase removal <br />depending on <br />also desirable but likely not acceptable. <br />efficiency <br />whether water <br />Conduct feasibility study to determine <br />level increase or <br />engineering feasibility, costs, and benefits. <br />excavation is <br />Approval needed from MN DNR if pond is <br />designated protected water. <br />necessary <br />Implement whole- <br />3 <br />$1500 - <br />Only makes sense if clpw is brought under <br />Lake alum <br />$2500 <br />control and watershed inputs are minimized to <br />treatment <br />extent practicable. Additional sediment <br />sampling desirable. Permits needed from state <br />for application, one time application allowed. <br />City of Roseville 58 <br />Parks Natural Resource Management <br />