Agenda - Economic Development Authority - 09/03/2015

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future water treatment plant to be constructed in this area. For our analysis, we assumed a 16 -inch water main would be constructed, with hydrants and service lines extended to the properties. 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 The costs included for street lighting were derived from recent projects within the City of Ramsey and are considered to be reasonable costs associated with providing street and pedestrian lighting along the corridors. Costs include conduit, wiring and the actual light fixtures to be installed. The density of the lighting fixtures is similar to the level provided along the recently constructed Riverdale Drive, east of Armstrong Boulevard. Our understanding is the spacing may be increased (decreasing the number of fixtures) for Phases 2 and 3. This may slightly reduce the costs associated with these phases. The costs provided are considered conservative for that reason and may be reduced depending upon the types of developments proposed. 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. Prepared by: Bolton & Menk, Inc. ADDITIONAL ANALYSIS City of Ramsey — Future Business Park Page 9