Agenda - Council - 12/11/2012 - Laserfiche WebLink

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be set. The survey team will survey the existing alignment of Riverdale Drive, the proposed alignment, a segment of Traprock, and the Mn/DOT ROW in the area. * Additional traffic control will be necessary for survey efforts on and adjacent to Highway 10. Wetland Investigation The Ramsey Engineering Department will complete a wetland investigation to determine if any existing or historical wetlands will be impacted. If necessary, a sub - consultant will be used to delineate wetland boundaries and complete the necessary WCA paperwork. Wetland impacts are not anticipated with this project. Field Review The design engineer will perform a field review of base plan information. Verify location of existing features, note legends on all warning, regulatory and route marker signs. Verify that plans provide sufficient information regarding existing wetland, drainage and sewer systems. Take photographs and/or video of existing residential driveways, street intersections, and the surrounding environment as necessary. Preliminary Design (30% Plans) Determine Horizontal Alignment The horizontal alignment of the new roadway section will be determined. The design team will identify the design speed of the roadway, and prepare the geometric design accordingly. Traffic Analysis The Ramsey Engineering Department will complete a traffic analysis of the area. As part of the investigation, the design team will confer with the Planning Department to determine existing and proposed land uses in the adjacent and surrounding areas. After the existing and proposed land uses are determined, the design team can forecast the traffic in the years 2013 and 2033. Determine Roadway Width / Cross Section After the traffic analysis has been completed, the roadway width and cross section can be determined to ensure that the road has the capacity for the level of traffic anticipated. The need for turn lanes and lengths based on anticipated turning movements will be identified. Vertical Road Alignment (ls` or 2nd run) The vertical road alignment will be determined with vertical curve lengths for the design speed. The earthwork will be calculated to determine the earthwork balance. A significant amount of fill will likely be necessary to construct the road across the current location of the stormwater pond. A retaining wall option should also be studied to determine if the addition of a retaining wall will result in less costs and less stormwater mitigation. 3