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January26,2024 <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 TSS TSS TSS TP Inflow, TP TP Cost- <br /> Inflow, Outflow, Reduction, lb/yr Outflow, Reduction, Effectiveness, <br /> lb/yr lb/yr lb/yr lb/yr lb/yr $/Ib TP/yr <br /> Linear 7,745.20 1,308.40 6,436.80 25.20 12.30 12.90 $12,600 <br /> Bioretention <br /> Features <br /> Bioretention Features on County Road H2 (CR H2): 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 /> 1 s <br /> f <br /> Figure 10. CR H2 Bioretention Features. <br /> Design with community in mind <br />