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Alternative Improvements At several locations along the corridor, opportunities exist for implementation of alternative alignments. These are depicted as options to consider based on development concepts. Alternative concepts are depicted at the intersection of Bunker Lake Boulevard and Puma Street (Figure 10) and the intersection of Puma Street and Alpine Drive (Figure 12). The alternatives are provided for future discussion and will not significantly impact project costs. Figures 5 through 12 in Appendix A depict future roadway and intersection improvements in the study area. Sanitary Sewer and Water Main An 18 -inch sanitary sewer main was extended west along Bunker Lake Boulevard as a portion of the 2011 improvements. Based on information contained in the Comprehensive Plan, The 18 -inch line will be extended along Bunker Lake Boulevard and north along Puma Street. North of the Puma Street/Bunker Lake Boulevard intersection, grade becomes an issue and a sanitary sewer lift station is required to serve areas further north and west. Phase 3 costs include the lift station, valve vault and forcemain. North of the lift station, the Comprehensive plan indicates a 12 -inch gravity main will be adequate to convey sanitary sewer flows from the area. For this analysis, we included an allowance for 8 -inch service lines to be extended to properties along the corridor. A 16 -inch water main was extended west along Bunker Lake Boulevard as a portion of the 2011 improvements. The Comprehensive plan indicated that either a 12 -inch or a 16 -inch water main would be required along Bunker Lake Boulevard and Puma Street, depending on the final selected location of a 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. Prepared by: Bolton & Menk, Inc. ADDITIONAL ANALYSIS City of Ramsey — Future Business Park Page 9