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I I I' I I I I I I .. I I I I I I I I' I 2005 PAVEMENT MANAGEMENT PROGRAM In addition to routing runoff through infiltration swales, the proposed Dunlap Street storm sewer system will direct its discharge into an expanded pond arca north of Grey Fox Road and east of the railroad tracks. The existing pond area would require minor excavation and clearing and grubbing to enhance its storage capacity, The pond currently collccts overland flow from the businesses to the north, Due to the flat topography, existing runoff rates into the pond are low and the ponding area is underutilized, The existing outlet from the pond will also be reconstructed to provide additional storage in the pond resulting in improved water quality of the discharge. As was discussed earlier in the report, some opportunity for water quality improvements are possible along the TH 51 Frontage Road, Along with raising the roadway to reduce nuisance flooding, the construction of a retaining wall will be necessary to maintain and possibly improve the function of the ditch. Maximizing hydraulic storage in the ditch will be pursued during final design in conjunction with discussions with property owners including the potential for drainage easement acquisition from the two businesses along the TH 51 Frontage Road, ~..~~....;:~~ ~",-'" View ofTH 51 Frontage Road and adjacent ditch MNDOT has a significant amount of flow that enters this ditch area, from the 1-694 pond as well as runoff from TH 51, The proposed water quality improvements along the TH 51 Frontage Road include enclosing the treated 1-694 pond discharge in a pipe which would bypass the ditch and connect directly to the culvert pipe that directs area runoff across TH 51 to the channel through Bethel University, This modification would create storage volume in the ditch for untreated City runoff generated in the area, MnDOT staff have been supportive of this View of existing TH 51 Frontage Road access point concept to date and have indicated that costs incurred by the City for the construction of the bypass pipe may be reimbursable by MnDOT through in-kind funding for the 1-694 project or potentially reimbursed directly by MnDOT at the time of construction, Other proposed drainage improvements include repairing curb and gntter within the area, Due to broken and sunken curb and gutter along Red Fox and Grey Fox Road, standing water remains on the roadway after rain events and melting snow, Spot repairs will be done on identified sections of curb and gutter and catch basins will be reconstructed to improve the drainage along the roadway and within the storm sewer system, URS 12