Agenda - Public Works Committee - 04/16/2024

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residential. Municipal water and sewer do not exist in the area, which located on the outside edge of the 2040 MUSA boundary. Valley View Acres includes the 0.02 (126-foot) 178th Lane cul-de-sac, which extends west off of Vanadium Street (Rodeo Hills Estates). This is 24-foot wide rural section. Per the geotechnical report the existing pavement section is approximately 1.75-inches of bituminous over 3-inches of aggregate base. The base below the pavement section was found to be silty clayey sand over lean to fat clay, which will require subsoil corrections. Storm water runoff is directed into drainage swales adjacent to the street, which direct runoff to the Rodeo Hills Estates subdivision to the east. The subdivision is made up of 3 single family home lots, approximately 10 acres, zoned MUSA reserved. Municipal water and sewer do not exist in the area, though this is the northeastern edge of the 2040 MUSA boundary, there are no current plans to extend services. Section 01 Unplatted (North of CR 27) is 0.35 miles of 26-foot wide urban section including bituminous curbing. The pavement section is approximately 2.5-inches of bituminous over 4-inches of aggregate base. Storm water runoff is directed to bituminous flumes, which flow runoff through existing drainage and utility easements to wetlands north in the City of Nowthen, and eventually into Rogers Lake. The subdivision is made up of 14 single family home lots varying between approximately 0.5 and 4.5 acres, zoned rural residential. Municipal water and sewer do not exist in the area, which is located well outside of the 2040 MUSA boundary. Proposed Improvements Ford Brook Estates 3rd and Section 01 Unplatted are proposed to be reconstructed back to a 30-foot wide urban section. The bituminous curb will be replaced with surmountable concrete curb and gutter. The alignment and profile are generally matching existing. Storm sewer inlet and pipe will collect runoff at the same low points, and direct to the same outfalls. The proposed pavement section is proposed to be 6-inches aggregate base below 3.5-inches of new bituminous pavement. This is proposed to be achieved by the Full -Depth Reclamation (FDR) process; • Reclaiming (grinding up) the existing bituminous and aggregate base • Installation of storm sewer inlets and piping at the low points • Hauling and stockpiling the reclaim material (typically stockpiled on site) • Excavating approximately 3-inches of sand o Required to make room for the new thicker pavement section without raising the road profile o Sand is proposed to be kept by the City for use on future projects or fill • Placing 6-inches of the recycled reclaim material (aggregate base) • Placing the new concrete curb and gutter • Placing first lift of new bituminous pavement • Replacing driveway aprons (matching existing material) • Restoring the impacted boulevard areas behind the new curb and gutter o Minimum 4" topsoil and hydroseed with residential turf seed • Placing the final lift of new bituminous pavement (3.5-inches total) Rodeo Hills Estates and Valley View Acres are proposed to be reconstructed back to a 24-foot wide rural section. The alignment and profile are generally matching existing. The drainage swales adjacent to the streets are generally not proposed to be re -graded as part of the project. The existing subsoils are generally poor and require subsoil corrections. The subsoil corrections are proposed to consist of 12-inches select granular (clean sand) placed on top of geotextile fabric. Drain tile will be placed at the edge of pavement along much of the subsoil correction to help keep water out of the subbase material. The new pavement section placed on top of this is proposed to be 8-inches of aggregate base below 3.5-inches new bituminous pavement. The reconstruction process is similar to the FDR process except the excavation depth will be approximately 18-inches rather than 3. The material is not considered clean because it contains silt and clay, and will become property of the Contractor. The geotextile fabric is placed to separate the poor underlying soils from the aggregate base. The extra aggregate base thickness along with the 1-foot of sand build additional strength to help the pavement bridge the poor soils. During construction, the Contractor will only sub -cut out what they can backfill to aggregate base by the end of the work day. On similar projects this has been 300 to 400 feet per day.