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89 neighborhood park into a stoz7n sewer retention pond. Just implementing this option <br />90 reduces the intersection flooding to 1.0 foot. Estimated cost: $549,578. <br />91 <br />92 Options 1 & 2: implementing both options would eliminate the intersection flooding. <br />93 Estimated cost: $697,837. <br />94 <br />95 ~1 ction to date: <br />96 We have not done any additional work in this problem area. Staff feels that due to <br />97 impacts to the neighborhood park, azay proposed solution would involve extensive public <br />98 participation. <br />99 <br />100 C. Area 3: South Owasso Blvd (Ladyslipper Park) <br />101 As a part of the 2006 S. Owasso Blvd Reconstruction project, the City completed the <br />102 improvements to the storm water runoff being discharged into Ladyslipper Park. <br />103 <br />104 Between Rice Street and Western Avenue, approximately 160 acres of single fancily <br />105 residential property drain into Lake Owasso through a drainage ditch that cuts through <br />106 Ladyslipper Park in a north south direction. This ditch was constructed in 1971, as a <br />107 canoe access to Lake Owasso. In the 1991 Lake Owasso Survey report, it was <br />108 determined that the removal efficiency of this system is very limited. Only 30 to 50% of <br />109 suspended solids and 9% of the total phosphorus were removed before being discharged <br />110 into Lake Owasso. <br />111 <br />112 Action to date: <br />113 In 2005, the City constructed a two cell pond system zaorth of the road as well as 3 <br />114 wetland/ biofiltration basins south of the road. These basins increased the TSS removal <br />115 to 81% and Phosphorus removal to 52%. This is a significant improvement to this <br />116 subwatershed area. Staff had committed to the DNR and property owners surrounding <br />117 Ladyslipper Park that additional wetland plantings would occur in and around these <br />118 basins, however, we wanted to be assured that they functioned according to desigza prior <br />119 to completing the installation. <br />120 <br />121 Recor~7rnended 2QQ8 action: <br />122 The 3 wetland/ biofiltration basins south of tl~e road were monitored in 2006 & 2007 to <br />123 establish water levels. Staff is satisfied that they are performing as designed and <br />124 recommends that wetland vegetation be planted to increase the biodiversity of these <br />125 basins. Ramsey Conservation District has developed a planting plan for these wetlands. <br />126 Staff recommends that we implement this planting plan in 2008. <br />127 D. Area 4: Gluck Lane Pond and Fairview Avenue at the TH 3b Overpass. <br />128 During intense storm events, street flooding occurs in the residential area near the Gluck. <br />129 Lane Pond, and on Fairview Avenue beneath the TH 36 ovezpass. Both areas are <br />130 tributary to the same storm sewer trunk system that drains north to the pond at the SE <br />131 corner of Fairview and County Road C (OP-1B). This trunk system serves 308 acres of <br />132 predominantly commercial/izadustrial land use. <br />133 <br />City of Roseville <br />2007 Storm Water Annual Report Page 4 of 15 <br />