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4. PROPOSED IMPROVEMENTS 4.1 Roadway The proposed roadway improvements include the reconstruction of the existing bituminous pavement and aggregate base, minor subgrade corrections only as needed, and installation of concrete curb and gutter. A typical roadway section is included in Figure 2A and Figure 2B in Appendix A. There are multiple options included for the width of the roadway, which will be described later in this report. The pavement section will be verified during final design once soil testing information is available. The streets will be constructed to meet State -Aid Standards. All existing street signs within the project will be replaced with new street signs that meet the Federal Highway Administration's (FHWA) requirements for retro -reflectivity. 4.2 Drainage Improvements Reconstruction of the streets provides the opportunity to improve drainage within the project area through the installation of additional storm sewer facilities. Storm sewer improvements are proposed to convey runoff from the roadway. Existing manholes, manhole castings, and catch basin castings will be repaired/replaced to meet current City standards. Stormwater treatment considerations will be included in the project in order to meet the watershed requirements. The project completed near Egg Lake in 2009 was designed with capacity to accommodate a portion of 147th Street. The westerly portion of the project will utilize this remaining capacity to the greatest extent possible. The preferred methods to meet the stormwater quality requirements in the remaining project areas will be to utilize regional stormwater credits to the extent possible, as well as onsite treatment if practical and necessary. The project design will include efforts to avoid or minimize wetland impacts. If wetland impacts occur, they will be replaced based on requirements of the TEP. Mitigation will likely be provided through either the Board of Water and Soil Resources Road Replacement Program or purchase of wetland credits from a private wetland bank. 4.3 Water Main There are no proposed improvements to the water distribution system. Water main valves and hydrants will be replaced or relocated as needed to facilitate the reconstruction of the roadway. 4.4 Sanitary Sewer There are no proposed improvements to the sanitary sewer system. The changes in street grade will necessitate the adjustment of castings or the alteration of the manhole structures to accommodate where more significant changes are proposed. Feasibility Report 147'h Street and Oneka Lake Boulevard Street Improvement Project City of Hugo, MN WSB Project No. 1904-870 Page 5