01/21/2004 Env Bd Packet - Laserfiche WebLink

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areas into'the design of the many parkingiotvegetated islands on the site. It is unclear from the, documentifthis low impact; development praetieeiscurrentlypart•of the proposal. Iiy,constructing depressed rather than raised islands and surrounding: the. islands with curb cuts or concrete edges that 'slope to the interior of the islands, runoff from the parking areas can: be rmutedintothese vegetated areas, then through a. piped overflow into the-undcrground chambers. In this fashion Ibe first flush ofnmoff events ti .zi ttieeffici can be, etainedintlialiia- 'xnf'iltratonaccas , maxun}zutg, encyof the ;est<af the . runolytreatment train Item ID: —Land Cover wrd'Irem 25-- Nearby tesour The proposal Includes a .high percentage taf impervious surfaces that will cover 30 acres if the projectis irupleinented Ss proposed. To preserve water quality in'the adjacent regional park stormwater runoff from the itevelopment will aced to bemanagedin an ecologically sensitive manner.. Portions of tbe site are identified as.regionaily important nthe joint Me tropolitan Council and MinncaotaDepartment ofilature:l'Resources;Regional NiapuaiResources Inventory and Assessment(NRI/A). The PAW should acknowledge this designation. Areas.of parttcrilar concern include:' •. proposed, reductions in wooded/forested land cover abutting the regional park; • potential loss of the island of woodsin the southwest/central part of the site; P. use ofnative vegetation in he:proposed urban/suburbanlandscaping where there are developmenit transitions.to the rein* park's natural areas. Item 19 — °'Geologicl`iazards and Soll "Conditions This item states that "excessively drained soils and relatively high ground watertable creates a potential for.ground water contamination:" The sanitary waste issue is addressed ;duougb the municipal sanitary treatment off site. It' is.recoinmend t attiiis information also be considered when managing stormwaferrunoff. Deep stormwater ponds would have the pteiliial to directlyc9ntaminate ground water witb oils, road saltt and other containinates aasociated with roads and parking lots. bear 21 —Traffic The EAW.states thatyear'2020 traffic volumes for full build -out of the site will be part of a'simulation pmgiranr that is being developed. it further States that results of the'traffic simulation asit relates;to the regionaltransportation system will be shared and discussed with Minnesota Department of Transportation (MOOT) and.the.Anoka County Highway department. The"nesults ofthe traffic simulation model should also be shared and discussed withthe•Metropolitan`Council. There is curve ntlyno transit serviette the proposed development. However, Routes 250 and' 262. do operate local service in the area, and Route 250 travels past the site on Lake Drive on its '1/41eadheaeMati Mating to and from St, Joseph's Church Park 8i Ride lot. Metro Transit and Metro Transit Services can consider rerouting: one or both of these routes to offer residents sserviceto both downtown Minneapolis and downtown St.Paul. In 3 5 RESPONSE 2 The majority of the interior parking lot islands do not have sufficient area to treat and store the amount of runoff that will be generated from the proposed development, but these islands will consist of a pervious surface that will provide some infiltration. Detention ponds and underground infiltration chambers will be utilized to treat and store runoff from the site. Where applicable, a drop curb design will be used to provide access to infiltration ponds. Currently, the site plan includes four onsite ponds that will receive runoff from impervious areas through a drop curb design. 3 At the time the EAW was written, the City was not aware of the Regional Natural Resources Inventory and Assessment (NRI /A) and that the MNDNR and Metropolitan Council had identified a portion of the site in the assessment. The Metropolitan Council was contacted, and a copy of the NRI /A map was attained. Preservation efforts have been incorporated into the site plan that will reduce impacts on a grove of mature trees located on the eastem side of the site (adjacent to the park). Furthermore, the proposed development includes natural open space areas and vegetative buffers between the development and the park boundary. 4 Suitable separation (3 to 4 feet) will be maintained between the bottom of detention ponds/infiltration chambers and groundwater to minimize the potential for contamination.