Agenda - Public Works Committee - 03/18/2025

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• July 23, 2024, the Ramsey City Council adopted Resolution #24-196, accepting the proposal from Bolton & Menk, Inc. to prepare plans and specifications for Dickenson's Mississippi Estates Street Reconstructions, Improvement Project #25-04. • October 22, 2024, the Ramsey City Council adopted Resolution #24-302, accepting the amended proposal from Bolton & Menk, Inc. to prepare plans and specifications for said improvements. • November 12, 2024, the Ramsey City Council adopted Resolution #24-311, accepting the proposal from Hydro-Klean, LLC for cleaning and televising the sanitary and storm sewer within the project area. • March 13, 2025 Ramsey staff held a public open house for said improvements. Pavement History The streets within Dickenson's Mississippi Estates were constructed in 1990. Crack seal / seal coat treatments were received in 1996, 2003, and 2013. Ground Penetrating Radar (GPR) was performed on the streets in 2020. At the time, the streets averaged 2.7 to 3.4 inches of bituminous over 3.7 inches of aggregate base. Staff review of the geotechnical report found clean sands, ideal for pavement and utility support within the project area. Additionally, groundwater is not anticipated to be a concern for the street reconstruction. Proposed Improvements Due to the condition of the existing watermain, the project includes replacing the existing watermain and water service lines up to and including the curb stops and fire hydrants. During construction, temporary water will be looped through the project and connected to the houses. The original project anticipated only spot curb and gutter replacements. However, by replacing the watermain, the majority of the existing concrete curb and gutter is impacted so the project calls for replacing all curb and gutters. Also, valley gutters will be placed across Tungsten Street at its intersection with Rivlyn Avenue, and to separate Tungsten Street from the private parking lots / drives on both sides of Tungsten Street. Because Tungsten Street handles frequent commercial vehicle traffic, it will be built to a 10-ton design including 4-inches of bituminous over 6-inches aggregate base. Rivlyn Avenue will be built to a standard neighborhood section of 3.5-inches bituminous over 6-inches aggregate base. The cul-de-sac at the west end of Rivlyn Avenue is partially within City -owned right of way and a roadway easement. Due mainly to the location of the existing houses and driveways, it was not deemed feasible to expand the cul-de-sac, and it will be constructed back to its current dimensions. The storm sewer at the intersection of Rivlyn Avenue and Tungsten Street will be required to be replaced due to the watermain replacement. Additionally, a hydrodynamic separator structure is being placed in the storm sewer outfall line to the Mississippi River. This structure will be placed in the boulevard, just south of Rivlyn Avenue, and is a cost-effective storm water quality retrofit solution that will serve to remove pollutants from the stormwater runoff before it is discharged into the river. City staff has discussed, and is continuing discussions with Lano, to address stormwater runoff concerns from their property at 6140 Highway 10. Bolton & Menk performed stormwater analysis of the site and determined a combination of on -site rate control and connection to the City storm sewer system is required to fully address the concerns. After discussions with Lano, they prefer an underground stormwater storage system versus an above ground pond, as vehicle storage space is already limited on their site. This project includes placing a storm sewer manhole in the Tungsten Street right of way and a 12-inch storm sewer stubbed to the right of way for a future connection to Lano's site. To fully make the connection, the storm sewer stub would cross the south end of Global Gloves property at 13 601 Tungsten Street. Global Glove has indicated they are open to allowing the pipe and subsequent permanent drainage and utility easement which would be necessary to make the connection. In the meantime, Lano will continue working with their engineer to design on -site stormwater improvements for potential future construction and connection to the 12" stub provided as part of this project. Alternate Bid