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January 26, 2024 <br />Don Peterson <br />Page 19 of 21 <br />Reference: Water Quality Assessment of Silver View Pond, Mounds View, MN <br />Total cost of the bioretention features is estimated at $165,000. Table 10 summarizes the BMP pollutant <br />reduction and cost-effectiveness. <br />Table 10. Linear Bioretention Features Treatment Level and Cost -Effectiveness. <br />BMP <br />TSS <br />TSS <br />TSS <br />TIP Inflow, <br />TIP <br />TP <br />Cost - <br />Inflow, <br />Outflow, <br />Reduction, <br />Ib/yr <br />Outflow, <br />Reduction, <br />Effectiveness, <br />Ib/yr <br />Ib/yr <br />Ib/yr <br />Ib/yr <br />Ib/yr <br />$/Ib TP/yr <br />Linear <br />7,745.20 <br />1,308.40 <br />6,436.80 <br />25.20 <br />12.30 <br />12.90 <br />$12,600 <br />Bioretention <br />Features <br />Bioretention Features on County Road H2 (CR 1­12): Two bioretention features are proposed in existing <br />depressional areas north of CR H2, as shown in Figure 10. Each will capture runoff from CR H2 and <br />provide filtration/infiltration prior to discharge into the pond. The features will make use of existing <br />depressions and draintile lines from the 2002 CR H2 project. It appears that the existing drainage system <br />has been largely filled with sediment and buried over time. The existing piping will be cleaned out and <br />reused if possible; otherwise, they will be replaced. Standpipes with inlet grates will be moved and raised as <br />needed to create appropriate wet ponding depth. The depression bottoms will be replaced with engineered <br />sand/compost subgrades, and draintiles will be provided. <br />Figure 10. CR H2 Bioretention Features. <br />Design with community in mind <br />