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accumulation was excavated, restoring the infiltration capacity that had been sealed. In addition, a lift station was constructed to provide a secondary outlet for extreme events. The new pond serves as a regional storm water treatment facility for the subwatershed. 5.1.4South Owasso Boulevard As a part of the 2006 South Owasso Boulevard Reconstruction project, the City con the improvements for the storm water runoff being discharged into Ladyslipper Park. Between Rice Street and Western Avenue, approximately 160 acres residential property drain into Lake Owasso through a drainage ditch that cuts thr Ladyslipper Park in a north south direction. This ditch was cons access to Lake Owasso. In the 1991 Lake Owasso Survey report, it removal efficiency of this system is very limited. Only 30 to 50% of su of the total phosphorus were removed before being discharged int In 2005, the City constructed a two cell pond system north of ththree wetland/ biofiltration basins south of the road. These basins incre to 81% and Phosphorus removal to 52%. This is a significant improvesubwatershed area. 5.1.5William Street Pond In 2011, a retrofit project on the William Street Pond was completed in partnership with CRWD. The project featured sediment removal, a new baffle device and pond inlet pipe, and two iron- enhanced sand filtration benches. The iron- enhanced sand filtration benches provide for removal of dissolved phosphorus (a fraction of the total phosphorus not removed through sedimentation). The benches, which consist of sand mixed with iron filings, remove the dissolved phosphorus via surface sorption to oxidized iron. William Street Pond (Source: Capitol Region Watershed District) 5.1.6Lake McCarrons Alum Treatment In October 2004, an aluminum sulfate (alum) treatment was applied to Lake McCarrons in order to improve the poor lake water clarity caused by excessive nutrients available for algae growth. The alum bonds with phosphorus present in the water which forms a non-toxic, white floc which descends to the bottom of the lake. The floc remains the phosphorus unavailable for algae overgrowth. The floc also co phosphorus adhered to the sediment at the bottom of the lake. 5.1.7Villa Park Wetland Restoration The Villa Park Wetland System is a constructed wetland located u McCarrons to provide stormwater treatment. Water quality monitoring and dayses completed for CRWD suggests that the wetlands have become a source of diss phosphorus to Lake McCarrons and the sediment removal efficiency of the system has significantly decreased over the past couple decades. Engineering design reports and plans Comprehensive Surface Water Management PlanROSEV120222 City of RosevillePage 29