Agenda - Planning Commission - 05/01/2003

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Incorporation of"water quality treatment ponds" under the criteria contained in Sub-part 10(A* and B), with nature of"credit" determined by LRRWMO. · The City of Ramsey has adopted the LRR kVMO stormwater managementplan by reference for this portion of the City, thus qualifying the City for eligibility under this element. As Table 12.2 shows, a total of 6.94 acres of wetland will be impacted and require replacement. A central feature of the RTC is a greenway corridor running though the central portion of the site. A system of stormwater ponds, infiltration swales and meandering channels will link flows entering the site from the northwest with flows generated on-site. This "waterway" will continue south from the RTC to the Mississippi River. Within the context of this waterway system, on-site wetland replacement will be provided though a combination of new wetlands, upland buffers and water quality improvement ponds designed to improve functions and values to downstream wetlands. The location of proposed on-site wetland replacement is Shown ~n Figures 12.3 and 12.4. Table 12.3 summarizes the acreage and type of wetland replacement for each location. A general description for each wetland replacement site follows. Table 12.3 Summary of Proposed Wetland Mitigation Wetland" ,~ '~: :" Wetland 'created .:; :. :::'~..I Type I 1.35 1.30 1.80 1.90 6.35 TTpe 2 0.45 0.45 Type 3 0.45 0.45 Type 4 Subtotal 1.35 1.30 2.70 I {1.90 7.25 PVC* 2.~0 3.50 3.40 9.20 (Stormwater) ?vt* 0.81 i.35 t.30 1.90 5.36 (Bu. ffers) PVC* 0.77 3.79 4.56 (Restoration) Subtotal 1.58 2.30 1.35 3.79 3.50 1.30 3.40 1.90I 19,12 Grand Total [ 26.37 *P[,'C - Public [/alue Credits Drainage Area 6 includes three existing wetlands (Wetland B, C and E). Wetland B is a created wetland that includes a narrow buffer within a conservation easement. The existing drainageway will be left intact, while 0.81 acres of the cropped wetland will be D-5 ~ 37