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The sections below provide a summary of the options along with rough cost estimates and <br />descriptions of what they involve. <br />MANAGEMENT OPTIONS FOR LANGTON LAKE <br />Management options for Langton Lake focus largely on achieving a small reduction in watershed <br />loadings to the lake, since this lake is in relatively good shape for its size and depth. These are <br />shown on the following page, in Table 5.4. <br />Table 5.4 — Management options matrix for Langton Lake <br />Activity <br />Phase <br />Estimated Cost <br />Comments <br />Targeted street- <br />1 <br />$150 /street mile <br />Sweep direct drainage In March/early April, June, <br />sweeping <br />October/November, remainder of drainage as budget <br />allows <br />Soil phosphorus <br />1 <br />$400 -600 in <br />Top priority are residential areas that drain directly to <br />testing <br />analytical costs <br />lake. Extend focus to other areas as funds and time <br />for 50 -80 samples <br />allow. <br />Promotion of <br />1 <br />$500 <br />Target areas where soil tests show no P necessary. Can <br />no- phosphorus <br />work through vendors and /or volunteer groups (including <br />fertilizer use <br />neighborhood). <br />In -lake <br />1 <br />$15 <br />Monitoring should be conducted bi- weekly throughout <br />monitoring <br />May- September period. Low cost option is participation <br />in MPCA's Clean Lake Monitoring Program (CLMP) <br />water clan only). <br />Conduct <br />2 <br />$300 — $600 <br />This is an important water quality protection feature <br />periodic <br />serving the industrial portion of the watershed. Periodic <br />sediment <br />removal of sediments (every 5 -10 years)- especially in <br />removal in <br />the upper cell- will preserve the treatment capability of <br />upper cell of <br />this pond. <br />industrial <br />treatment pond <br />Treat runoff <br />3 <br />$1200 - <br />Possibilities may be Park parking lot west of lake and <br />from high <br />$30,000 /site plus <br />residential streets east of lake. Treatment would utilize <br />priority <br />maintenance <br />sub -grade swirl concentrators or equivalent, possibly <br />impervious <br />discharging to filtration/infiltration feature. Conduct <br />areas in direct <br />feasibility study to evaluate physical feasibility, estimate <br />drainage. <br />specific costs. <br />Maintain more <br />3 <br />$50043500 <br />Options for management of this cell to maintain more <br />open water in <br />depending on <br />open water include: <br />north cell. <br />option d ursue <br />p p <br />Chemical treatment <br />Cutting and removal <br />Excavation <br />An MN DNR permit will be required to execute any of <br />these options. A "do nothing" option should also be <br />considered. <br />City of Roseville 56 <br />Parks Natural Resource Management <br />