Agenda - Public Works Committee - 11/15/2022

Home

this project. Additionally, Staff is aware of Northern Natural Gas mainline crossings in three locations across the project. Staff is anticipating much of the project will require subsoil corrections due to the presence of clay soils. Public Works Staff in the past has patched areas of the road with clay coming up through the surface of the pavement, and several spots of vertical displacement can be found in the pavement. The project proposes to replace existing street crossing culverts, otherwise drainage issues within the project area are not known, and the swales are performing well. This will be explored further during project design. Estimated project costs are $2,283,456 ($2,204,160 Pavement Management Funds and $79,296 Storm Water Funds). IP 23-06 2023 MSA Pavement Overlay Improvements This project proposes to mill and overlay the pavement of Riverdale Drive between Ramsey Boulevard and Feldspar Street. Staff will determine the exact project end points during design, but anticipates the project limits stopping east of Ramsey Boulevard to tie into the proposed Ramsey Boulevard Interchange construction limits. Riverdale Drive is 0.61 miles in length, 40 feet wide urban section measured to the face of curb. The average daily traffic (ADT) volume between Ramsey Boulevard and Garnet Street is 3,450 ADT. Between Garnet Street and Feldspar Street the ADT is 1,100 ADT as of 2019. Staff is not proposing any repairs to watennain or sanitary sewer with this project. Minor storm sewer structure repairs, typically re -grouting catch basins, is proposed. Additionally, any pedestrian ramps will be brought up to current Americans with Disabilities Act (ADA) compliance. Estimated project costs are $209,688 ($190,625 MSA Funds and $19,063 Stonn Water Funds). IP 23-07 2023 Neighborhood Pavement Overlay Improvements This project proposes pavement mill and overlay improvements within five residential subdivisions within the City; Alpine Meadows and Highlands at River Park 1st 2nd 3rd, and 4th subdivisions. The project totals 1.83 miles in length and all proposed areas are urban sections with varying street widths. Staff is not proposing any repairs to watermain or sanitary sewer with this project, but minor storm sewer structure repairs, typically re -grouting catch basins, are proposed. Additionally, any pedestrian ramps will be brought up to current ADA compliance. Estimated project costs are $517,000 ($470,000 Pavement Management Funds and $47,000 Storm Water Funds). IP 23-10 Whispering Pines Estates Plat 3 Street Reconstructions This project proposes reconstruction of the streets within the Whispering Pines Estates Plat 3 subdivision, which is generally located west of Armstrong Boulevard between 157th Lane and 158th Lane. The streets are 24 feet wide rural sections, totaling 1.72 miles in length. Traffic counts have not been taken, but Staff anticipates typical neighborhood traffic. No municipal sewer or water exist in the project area, and utility extensions are not proposed. The existing drainage is through swales adjacent to the roadway and street crossing culverts. The neighborhood includes Whispering Pines North Park, which is a vacant low area serving as a ponding area for the subdivision. No upgrades to the Park have been proposed. Proposed CIP costs reflect a full -depth reclamation process. Staff believes this subdivision would be a good candidate for the reclamation rehabilitation process used on the streets west of Armstrong Boulevard as part of the Autumn Heights Street Reconstruction project performed in the fall of 2022. This process would require good sub -soils, which will be determined from the geotechnical report due December 30, 2022. In general, the existing drainage ditches along the roadways appear to be performing well. This will be explored further during project design and review of the topographic survey due December 2, 2022. Staff is proposing to replace the existing street crossing culverts with the project. As part of the project, Staff will be exploring the feasibility of increasing the size of the 66-foot diameter cul-de-sac on the south end of Eland Street. Estimated project costs are $1,065,680 ($968,800 Pavement Management Funds and $96,880 Storm Water Funds). Project Timelines Staff is proposing to prepare plans and specifications for these 2023 Pavement Management Program projects in-house, as part of their normal duties. The following are the proposed general project timelines: December 13, 2022 City Council Authorization to prepare plans and specifications Dec 2022 — Feb 2023 Staff prepares plans and specifications Jan — Feb 2023 City Council approves plans, authorizes bidding Feb — Mar 2023 Bid openings, City Council awards contracts May — June 2023 Begin construction