2007-01-23_PWETC_AgendaPacket - Laserfiche WebLink

Home

Ladyslipper Park in a north south direction. This ditch was constructed in 1971, as a canoe access to Lake Owasso. In the 1991 Lake Owasso Survey repOli, it was determined that the removal efficiency of this system is very limited. Only 30 to 50% of suspended solids and 9% of the total phosphorus were removed before being discharged into Lake Owasso. Action to date: As a pmi of the reconstruction project, the City constructed a two cell pond system north of the road as well as 3 wetlmldl biofiltration basins south of the road. These basins increased the TSS removal to 81 % and Phosphorus removal to 52%. This is a significant improvement to this subwatershed area. . Area 4: Gluek Lane Pond and Fairview Avenue at the TH 36 Overpass. During intense stonn events, street flooding occurs in the residential area near the Gluek Lane Pond, and on Fairview Avenue beneath the TH 36 overpass. Both areas are tributary to the same storm sewer trunk system that drains north to the pond at the SE comer of Fairview and County Road C (OP-IB). This trunk system serves 308 acres of predominantly commercial/industrialland use. An analysis of the existing trunk system indicated that during a 100- yr rainfall event (6- inch/24-hr), Gluek Lane experiences some street flooding and the TH 36 underpass is flooded to a 4.6 foot depth. This is the result of the trunk storm sewer line located in Fairview Avenue being undersized, causing backflow and surcharging in these areas. Recommendation: The CSWMP evaluated 4 options in an effort to resolve the problems identified above. Option I: Expansion of Pond OP-IA: this option would increase the holding capacity of the basin located in the backyards of the homes on Gluek Lane. This option would eliminate the street flooding on Gluek Lane, and reduce the flooding at the Fairview/TH36 underpass to 4.2 feet. Estimated cost: $63 1,3 I 8. Option 2: Ponding upstremn of Point A. This option would create 4.8 acre-feet of storage in a pond at the SE corner of Fairview and TH 36, increasing capacity for this subwatershed. Flooding at Fairview would be reduced to 3.3 feet. Estimated cost: $ I 56,000. Option 3: Provide aggressive rate control for the Rosedale Mall site. This option assumes a 40% reduction in peak flow from the Rosedale Mall site. It also assumes that options I & 2 are implemented. Estimated Cost = $787,318 + costs for Rosedale improvements. Option 4: Construct a new stonn sewer trunk line along Fairview Avenue. This option includes the construction and reconfiguration of the Fairview trunk stoml sewer. It eliminates flooding under TH 36 and on Gluek Lane, however, it pushes the water City of Roseville 2006 Storm Water Annual Report Page 4 of 11