Agenda - Council - 07/23/2024 - Laserfiche WebLink

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6. 11. CC Regular Session New Meeting Date: 07/23/2024 Primary Strategic Plan Initiative: Address infrastructure needs. Title: Adopt Resolution#24-196 Ordering Plans and Specifications for Dickenson's Mississippi Estate Street Reconstructions, Improvement Project#25-04 Purpose/Background: Purpose: The purpose of this case is to order plans and specification and award the engineering design proposal from Bolton&Menk, Inc. for Dickenson's Mississippi Estate Street Reconstructions, Improvement Project#25-04. Background: The 2024—2033 Capital Improvement Program(CIP) identifies the streets within the Dickenson's Mississippi Estate subdivision for street reconstruction in 2025. A street segment summary for this project is attached to this case. Project Scope This project proposes to reconstruct Tungsten Street between Riverdale Drive and Rivlyn Avenue, as well as Rivlyn Avenue between the western cul-de-sac and the eastern edge of plat. The streets are 31-foot wide urban section with concrete curb and gutter. Tungsten Street has commercial use on both sides,while Rivlyn Avenue is residential,with single-family homes. Though only marked by signage rather than pavement markings or off-street trail facilities,the streets are part of the Mississippi River Trail Bikeway. The streets total 0.26 miles in length. Utilities Sanitary sewer,watermain and storm sewer exist within the project area. The watermain and sanitary sewer were installed in 1990,making it 35 years old when the street reconstruction will occur, and 95 years old by the end of the streets 60-year design life. During the Ramsey Gateway Highway 10 Improvements, it was found that the watermain gate valves were built with mild steel bolts rather than stainless steel as is used today. This has resulted in premature eroding of the valve bolts,which in recent years has caused more than one valve to fall apart when the valves were exercised. It is likely the retainers used for holding watermain bends and fittings together also used mild steel bolts. If not replaced, staff s concern is that the vibrations which occur to compact base and pavement during construction have the potential to separate already compromised watermain components and cause leaks under the new pavement.Staff recommends replacing all watermain, gate valves and water service lines including curb stops, as part of this project. Staff will televise the sanitary sewer and storm sewer to determine the condition of the pipes and structures, and make a recommendation if any repairs should be included in the project. In addition to televising the mainline sanitary sewer, Staff is recommending offering to televise service lines to look for potential damages or clogs which may have been caused by the recent sanitary sewer backups within this subdivision, associated with the Gateway Highway 10 Improvements. The CIP includes addressing stormwater runoff from 6140 Highway 10 as part of this project. As part of this project an analysis of stormwater runoff from 6140 Highway 10 will be performed, and improvements to the storm sewer system are proposed to be incorporated into the plans. Streets The project is proposing to only perform spot concrete curb and gutter replacements,though if watermain replacement occurs a significant amount of curb and gutter may be replaced. Tungsten Street serves commercial