Agenda - Council - 01/09/2018 - Laserfiche WebLink

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3. EXISTING CONDITIONS 3.1 Existing Streets The existing right-of-ways along the street segments proposed to receive overlays as part of this project generally are 66-feet in width. The paved streets vary in width from 30 to 31-feet as measured from the back -of -curb to back -of -curb. All streets in this project were constructed with bituminous pavement and curbing, and many of the street segments contain storm sewer. Braun Intertec was previously employed to complete a ground penetrating radar (GPR) analysis for the project areas, which included driving the GPR equipped vehicle throughout all street segments within the project areas. Summary tables and charts of the GPR Analysis are attached in Appendix D. The GPR Analysis provides bituminous and aggregate base thicknesses. City staff used this data to determine the appropriate treatment for the pavement. The existing bituminous thicknesses varied from between 0.5 inches and 6.3 inches. The average bituminous thicknesses by project area ranged from 2.0 to 3.3 inches, with an overall average of 2.6 inches across all the project areas combined. The average section thickness, including pavement and aggregate base, ranged from 6.8 to 7.7 inches. The City's current residential street pavement section standard includes 3.5 inches of bituminous pavement and 4 inches of aggregate base, totaling 7.5 inches. City staff visually inspects each public street segment throughout the City, typically on an annual basis, to determine the pavement condition. Staff uses the Pavement Surface Evaluation and Rating (PASER) system to assign a numerical rating between 1 and 10 to each street segment. Streets rated with a 10 are considered to be in excellent condition therefore requiring no improvement. The street segments proposed to receive overlays in 2018 had 2017 PASER ratings of 3, 4, and 5 making them good candidates for bituminous pavement overlay improvements in 2018, which will extend the life of the pavement approximately 20 years. Based on the manner in which the existing pavement is deteriorating, staff does not believe there are any issues with subgrade soils that will negatively impact the design life of the proposed improvements. Staff also does not believe groundwater will be a concern for any of the proposed improvements. 3.2 Watermain Watermain does not exist under any of the streets in the proposed project areas. 3.3 Sanitary Sewer Sanitary sewer does not exist under any of the streets in the proposed project areas. 3.4 Storm Sewer/Drainage Storm sewer exists under several of the streets in the proposed project areas, but is not proposed to complete any significant repairs or storm sewer construction as part of this project. Feasibility Report 2018 Street Overlay Improvements City of Ramsey Project No. 18-03 Pagel