2008-02-26_PWETC_AgendaPacket - Laserfiche WebLink

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180 181 On December 27, 2007 the City purchased the home at 1779 Rose Place as way to 182 eliminate the potential of future property damage during extreme stone events. Staff 183 anticipates that this house will be demolished this spring and will explore tlae reuse of this 184 property for additional pond storage. 185 186 E. Area 5: Arona Pond and surrounding area. 187 Arona pond is located within the Applewood Pointe redevelopment area. Prior to 188 development, this pond was a landlocked basin. For years the normal water level of the 189 pond was governed by infiltration. As the surrounding area developed, the basin became 190 apart of the stone water system. An outlet was installed around 1979 that enabled the 191 basin to pass runoff from extreme events. Approximately 112 acres contribute runoff to 192 Arona Pond. Over the years, the sandy bottom of this pond became sealed with sediment, 193 eliminating the infiltration capacity of the basin. This resulted in localized flooding of 194 the surrounding properties. As a part of the Applewood Pointe redevelopment project i~a 195 2003, the City reconstructed this pond. The reconstruction project nearly doubled the 196 capacity of the basin. Years of sediment accumulation was excavated, restoring the 197 infiltration capacity that had been sealed. In addition, a lift station was constructed to 198 provide a secondary outlet for extreme events. The new pond serves as a regional storm 199 water treatment facility for the subwatershed. 200 201 Recommended 2008 aetron: 202 After monitoring this system for almost 5 years, staff believes that the issues identified 203 have been addressed. We recommend that this area be removed from the CSWMP 204 problem areas. 205 206 F. Area 6: 35W corridor 207 Historically the City has observed flooding within the 35W corridor ponds after extreme 208 rain events. These ponds include the basins on both sides of the 35W just to the north of 209 County Road C and around the highway ramps. The primary concern for these 210 suhwatersheds is the downstream pipe located within the Mn/DOT right- of way. This 211 pipe is 21 inches in diameter. Simply increasing the size of the pipe would push the 212 problem down stream causing flooding in another location. Also, this eon•idor is located 213 within Rice Creek Watershed and their new volume reduction standards would not 214 support an increase to the runoff discharged to Long Lake. As a part of the Cou~aty Road 215 C project, additional storage was constructed to address the runoff fi~ozxz County Road C 216 through panding and rain gardens. 217 218 Action to Date 219 This subwatershed was added as a problem area in 2006. 220 221 Recornn~errdatiorz: 222 In an effort to address some of the flooding concerns in this problem area, staff will 223 continue to require redevelopment projects to reduce the volume of water that is sent to City of Roseville 2007 Storm Water Annual Report Page G of 15