Agenda - Economic Development Authority - 08/13/2015

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Figures 13 through 15 in Appendix A depict sanitary sewer and water main improvements. Storm Water Management Storm water management concepts were developed to maintain existing drainage patterns and preserve the conveyance and flood storage capacity of the primary wetland corridor that bisects the area. This will restrict development along the wetland corridor and retain the pre -development flood capacity, thereby maintaining existing flow rates into the COR. The study area can be segmented into three drainage districts, generally delineated by future land use. Figure 16 in Appendix A displays the drainage area breakdown and a general regional pond layout. The drainage area consists of a multi -use site (Area 1), residential area (Area 2), and commercial and industrial sites (Area 3). The watersheds were modeled under future land use conditions to generally size retention ponds to meet existing flow rates. The ponds were also located with respect to potential storm sewer depths, reductions in wetland impacts, maximization of developable area and potential aesthetic function. The ponds depicted on Figure 16 in Appendix A depict areas that are best suited for regional rate control basins only. Additional design parameters and regional storm water management planning should be further refined as the areas begin to develop. Cost estimates were not developed for the regional pond construction or internal site storm sewer conveyance. It is anticipated that costs associated with pond construction will be completed by the developer as a portion of the site grading. Also, it is assumed that internal site drainage will be accommodated by dry swales and ditch systems to reduce storm sewer costs. Street Lighting Street lighting was included in the project costs to the level provided along Riverdale Drive, east of Armstrong Boulevard. This includes both street level lighting and pedestrian lighting along the corridors. Trails/Sidewalks Existing trails were previously constructed along the north side of Bunker Lake Boulevard and the west side of Puma Street. Project costs were prepared which include trails along the south side of Bunker Lake Boulevard and the east side of Puma Street. Phase Transitions There is the potential for portions of the roadways to be constructed to wider sections than currently exist. If this occurs, the new roadways will need to taper to meet the existing roadway widths. The tapered sections will then be removed as the next phase of improvements is completed. Costs were included in each phase for these tapering sections. Right Turn Lane Additions The roadways depicted in the exhibits depict through lanes and left turn lanes. Right turn lanes will be required at each access off of Bunker Lake Boulevard and Puma Street. Individual access locations were not considered in this study, and so the locations and lengths of right turn lanes were not considered at Prepared by: Bolton & Menk, Inc. ADDITIONAL ANALYSIS City of Ramsey — Future Business Park Page 9