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3. PROPOSED IMPROVEMENTS 3.1 Street Improvements—Hazelnut Park Neighborhood A pavement forensic study was conducted for Edgewater Avenue and the west portion of Jerrold Avenue, including the collection and analysis of 6 pavement core samples. The core samples were found to be in fair to very poor condition, exhibiting distresses such as delamination or deterioration as described in Appendix C. Recommended street improvements for Edgewater and west Jerrold consist of spot repairs to existing curb followed by full depth reclamation to mill the existing bituminous pavement and re-blend the material with a portion of the underlying aggregate base material prior to establishing final base elevations and placement of a new pavement surface section. Full depth street reconstruction is recommended for the remaining east portion of Jerrold Avenue, Glenpaul Avenue and Prior Avenue. Street construction would occur following replacement of water main as described below. The City Council requested that staff consider the following two alternatives for reconstruction of Jerrold, Glenpaul and Prior Avenues to evaluate potential reductions in project costs and assessments. ■ Alternative 1: Full depth street reconstruction, including installation of curb and gutter along with associated storm sewer drainage improvements. ■ Alternative 2: Full depth street reconstruction without curb, gutter or a substantially expanded drainage system. The cost estimate for Alternative 2 does not include construction of drainage ditches along the edge of the roadway. Typical street sections for the two alternatives is provided in Appendix D. The associated project costs for these two street improvement options is described in Section 5 of this report, with potential cost reductions reflected in both the street and drainage expenses. The geotechnical investigation shows underlying soils consisting of sand, sand with silt and lean clay as provided in Appendix B. While these soil types may have a higher infiltration rate compared to other soil types found in the City, the rate of infiltration would not provide the equivalent benefit of curb and storm sewer in the preservation of the street and conveyance of runoff, particularly during winter freeze-thaw cycles. Based on a review of the two alternatives during the City Council work session on June 15, 2020, staff is recommending that the City proceed with Option 1 street improvements due to the balance of cost with the benefits of improved surface drainage and extended service life of the pavement. The potential cost savings with Alternative 2 is estimated to be approximately $299,000. While Alternative 1 has a higher initial cost, the addition of storm sewer and curb would reduce long-term pavement deterioration due to freeze/thaw cycles, reduce standing water and ice formation along the road, reduce erosion along the pavement edge, and would result in a longer service life and lower overall life cycle cost. Feasibility Report Page 6 2021 PAP Street and Utility Improvements City Project Number PW 21-0100