2019-08-14 CC Packet - Laserfiche WebLink

Home Browse Search

FEASIBILITY STUDY 3.0PROPOSED ROADWAY IMPROVEMENTS Given the poor condition of the existing roadways, the need for extending municipal water service, potential future redevelopment opportunities, and efficiencies of combining these improvements, it is the recommendation of this report that the following improvements be completed as part of this project: 3.1STREET SECTION IMPROVEMENTS - FULL RECONSTRUCTION The streets in the project area have a lack of both proper drainage and subbase material to withstand the high water table and typical freeze thaw cycles. Therefore, the proposed improvement is a full reconstruction of the street section. Soil borings have been ordered to confirm our assumptions regarding the existing road section conditions which are based on the general knowledge of the area and observations of the pavement conditions/structure. The proposed street section will add significant depth to the materials in the section, including the aggregate base, sand, drain tile and geotextile fabric, which will conform to the City of Centerville standard pavement sections for 9 ton residential roadways (see Figures 4 and 5). Additionally, catch basins and storm sewer will be replaced and added to improve drainage within and adjacent to the roadway. Because these improvements will generally widen roadways and will extend water services to the property line, a significant amount of front-yard disturbance will occur. Boulevards will be restored with sod and driveways will be replaced in-kind. The amount of sod and driveway replaced on each lot will depend on service locations and any changes in street grade which may be part of the final design to fit the existing topography. On most streets within this project area, the proposed roadway width is 28’ between the faces of the curb. This is narrower than the City of Centerville’s standard residential street width of 32’. Several factors were considered in recommending the proposed narrower street width: The existing Right of Way widths are 50’, which is narrower than other developed areas in Centerville. The existing setbacks to homes in the downtown area are generally less than in other areas. Using this narrower 28’ roadway width will minimize shortening of driveways so that vehicles are able to continue parking in driveways without encroaching into the road. The existing street width in the project area is approximately 22’. The widening impacts to adjacent properties (driveways, yard grades, etc.) with the proposed 28’ width will be less than a 32’ wide roadway. The proposed 28’ section will also reduce the overall increase in impervious area compared to the standard 32’ street width, therefore lessening the amount of stormwater management/treatment that is required. This allows the storm water to be mitigated City of Centerville 2020 Downtown Street and Utility Improvement Project Project No.: 193804758 4 24