Agenda - Council - 03/22/2022 - Laserfiche WebLink

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to have an average thickness of 4.20 inches on Sunwood Drive and 3.9 inches on Waco Street. GPR was not able to reliably identify the aggregate base thickness,however,the soil borings performed as part of the geotechnical report found an average of 6.4 inches. Proposed Improvements Sunwood Drive and Waco Street are Municipal State Aid(MSA) streets, and must comply with State Aid design requirements. MSA design requires these to be a 10-ton design. Based on the traffic counts performed in 2021 (1,800 ADT Sunwood, 580 ADT Waco), the required pavement section is 5" aggregate base and 4"bituminous pavement. Staff review found the existing pedestrian ramps within the project area did not meet current ADA requirements, therefore all seven pedestrian ramps will need to be removed and replaced. The concrete curb and gutter were found to generally be in good condition, and only spot repairs are proposed. Staff is proposing minimal impacts to the existing bituminous trail with the project beyond what is required for matching into the new pedestrian ramps. The south leg of trail at the intersection of Sunwood Drive and Trunk Highway 47 is proposed to be straightened,the current 90-degree corner is a hazard for plowing. Review of the sanitary sewer and watermain did not find issues requiring repair. The City will be placing inflow and infiltration barriers on the sanitary sewer manholes with this project. The City received an MCES I/I Grant for this work, which will reimburse the City for the costs associated with the I/I barriers. Televising of the storm sewer system found more issues than anticipated, and will require removal and replacement of six storm sewer structures and their connecting pipes. The majority of this work will be concentrated at the intersection of Sunwood Drive and Zuni Street. The current pavement marking layout meets State Aid standard, and the road is proposed to be marked back to the existing layout. Generally, impacts to boulevards will be minor,just as necessary for removal and replacement of concrete curb and gutter,pedestrian ramp improvements, and excavation required for the storm sewer repairs. Anticipated Build Process •Install traffic control measures o These are maintained throughout the project o Layout of traffic control may be adjusted to accommodate construction periodically •Install erosion control measures •Full-depth reclamation of existing bituminous pavement and aggregate base • Storm sewer repairs •Project removals (spot curb and gutter,pedestrian ramps, driveways as needed) •Place new concrete curb and gutter and pedestrian ramps (5 to 7-day cure time) •Remove excess reclaim material, shape and compact 5 inches of remaining material o Excess reclaim is stockpiled and will be used on future City projects •Place first lift of new bituminous pavement •Finish any trail and driveway repairs •Restore the boulevard in any impacted areas o 4 inches topsoil, seed and hydro-mulch •Place the final lift of new bituminous pavement o Remove traffic control measures as allowed •Place all pavement marking,must wait 72 hours after paving •Erosion control measures are removed after restoration has been completed Preliminary Schedule Remaining •Council Approves Plans and Specifications/Authorizes Ad for Bids o March 22, 2022