Agenda - Council - 01/11/2016 - Laserfiche WebLink

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The existing drainage and storm sewer system will be improved by adding concrete curb and gutter and providing additional catch basins along curb lines to reduce the width of stormwater encroachment onto the pavement surface during rainfall and snowmelt events. Sub -drain pipe will also be added along the outside edges of subgrade correction at low points to ensure adequate subgrade drainage. Deficient and undersized storm sewer pipes will also be replaced. Existing storm sewer pipe will be inspected and televised as needed to evaluate the condition of the pipe sewer. Stormwater modeling will be completed to determine if any existing pipes are undersized. Stormwater quality treatment improvements may also be required for this project since the street is proposed to be widened up to 8 feet over approximately 35% of the project corridor. Staff will evaluate the need for additional stormwater treatment improvements using stormwater modeling. If needed, structural pollution control devices and/or surface treatment improvements such as infiltration basins or trenches will be constructed. The engineer for the Lower Rum River Watershed Management Organization will be consulted to determine whether infiltration practices will be required with this project. 4.1.3 Geotechnical Considerations This project involves reconstructing two bituminous streets that have been in service for over 30 years. NTI completed a Geotechnical Evaluation Report, which is included in Appendix D. 4.1.4 Other Considerations Driveways: Residential driveway entrances will be reconstructed to varying degrees with this project. The limits of construction will vary with each driveway based on the elevation of the street abutting the driveway and the pavement type. During design, staff will evaluate the construction limits for each driveway and will incorporate this into the plans, but as with all street reconstruction projects the exact limits of construction will be determined in the field during construction. Right -of -entry forms will be required from each residential property owner to complete any work outside City right-of-ways and easements. Special concrete (driveways and sidewalks): Currently, two driveways and one sidewalk along the corridor are constructed with stamped and/or colored concrete. These will be proposed to be reconstructed in-kind, which will require Staff to work closely with the property owner to ensure the proposed work is acceptable. Costs for this work are not specifically included in the engineer's opinion of probable costs, but are accounted for in the contingency costs. Aggregate Base Class 5 (modified The City owns a stockpile of aggregate base class 5 modified which is located on the future Public Works campus property. This material meets the City's aggregate base Feasibility Report Andrie Street and 164th Lane Reconstruction City of Ramsey Project No. 16-00 Division C Page 10