Agenda - Public Works Committee - 02/16/2016

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4. PROPOSED IMPROVEMENTS 4.1 Storm Sewer System Improvements The existing storm sewer system serving Business Park 95 will be improved by constructing roughly 1,100 linear feet of 18" concrete storm sewer pipe, along with 26 linear feet of storm sewer manholes, under portions of Unity Street and McKinley Street to provide a positive outlet for the regional stormwater pond serving the area. The proposed storm sewer improvements have a design life of at least 50 years, assuming that proactive, regular maintenance is performed over the life of the improvements. No stormwater quality treatment improvements are required with this project since the street is proposed to be reconstructed to its original dimensions. However, Staff will evaluate the storm sewer system and stormwater pond facilities to ensure that no additional stormwater retention and/or treatment improvements are required. This evaluation will be completed in-house using stormwater modeling during the design process. If needed, stormwater outlet pipes and ponding facilities will be increased in size, and structural pollution control devices and/or surface treatment improvements such as infiltration basins or trenches will be proposed. Figure 2 in Appendix A shows the scope of the proposed storm sewer system improvements. 4.2 Watermain Improvements Impacts to existing trunk watermain or water service lines are not anticipated with this project. However, portions of watermain may need to be lowered or insulated as part of the project. The costs for this work are accounted for within the 10% contingency costs. 4.3 Sanitary Sewer Improvements Impacts to existing trunk sewer or sewer service lines are not anticipated with this project. However, portions of trunk sewer or service lines may need to be insulated as part of the project. The costs for this work are accounted for within the 10% contingency costs. 4.4 Street Improvements Portions of Unity Street and McKinley Street will need to be reconstructed in the same location to accommodate the new storm sewer improvements. This work will primarily involve removing and replacing B618 concrete curb and gutter and bituminous pavement, as well as some turf restoration. 4.5 Private Utilities Staff has not yet met with electric, gas, and telecommunication utilities regarding this project. During preparation of plans and specifications, staff will meet with the private utilities to discuss the proposed improvements and determine if opportunities exist to coordinate work efforts to the mutual benefit of the private utilities and the City. This is reflected in the project schedule. No impacts to power poles or street lights are anticipated with this project. Feasibility Report Business Park 95 Regional Stonnwater Pond Outlet Improvements City of Ramsey Project No. 16-36 Page 4