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May 2, 1996 RE: Mike Falk, City Planner /'IIY Jay Kennedy, Assistant Director o[Public Works L ;/l TWIN LAKES CORPORATE CENTER PHASE 4~l To: From: The Engineering Department has reviewed the above mentioned project. The following is a list of concerns: 1. BR W is currently in the process of performing a feasibility study in order to solve two issues regarding the Twin Lakes area. The first is regarding the location of Twin Lakes Parkway. It is desired to line up the future Twin Lakes Parkway with the existing on-ramp to northbound I-35W. During past discussions, MnDOT has indicated that the ramps for I-35W could not be moved as far north as would be necessary to line up with Twin Lakes Parkway in its currently proposed location As part of the feasibility study, BRW will approach MnDOT to determine whether the ramps to 1-35\V could be moved to the north in the future and, if so, how far The resolution of the Twin Lakes Parkway location will have an effect on the proposed site. The second issue surrounds stormwater detention and treatment. It is desired to modify the ponds which currently exist on MnDOT right-of-way between northbound I-35W and Cleveland Avenue. The pond would be modified, so it would serve the west half of the Twin Lakes development. This would eliminate having a series of small ponds on each site and create a more regional ponding situation. 2. In past discussions with therleveloper, two options for handling stormwater have been generated which are contingent on the findings of the feasibility study. If the ponds on the west side of Cleveland Avenue can be modified, the developer would construct a temporary detention pond on the 10na Lane right-of-way that would remain until the modification of the ponds on the west side of Cleveland Avenue is completed. The pond would then be eliminated. If the regional ponding issue cannot be resolved, the developer would be required to have a detention pond on-site in order to handle stormwater. Both options have been addressed in the current submittal. Regardless of which option is chosen, the developer will be required to obtain permits from Ramsey County, Rice Creek Watershed District, and MnDOT in order to discharge stormwater into the ponds on the west side of Cleveland Avenue.