7.6. A. & B. SR 06-06-2005 - Laserfiche WebLink

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Street V. PROPOSED IMPROVEMENTS The proposed improvements for the Northstar Business Park development include street, sanitary sewer, watermain, storm sewer construction, expansion of the regional storm water pond to serve the site, and mass grading to establish the lots. A detailed description of each proposed improvement is provided below. The street improvements consist of an urban style roadway 39.5 feet face to face in width with barrier concrete curb and gutter and a 6 foot wide sidewalk along one side. For the purposes of this report the soils conditions have been assumed to match those found in the Elk River Business Park just north of this site. This street section has been assumed to match the section built in Elk River Business Park. The proposed pavement section for all the streets will be a 10 ton design consisting of 8 inches Class 5 aggregate base, 2 inches of bituminous base course, and 2 inches of bituminous wear course. In the design phase a geotechnical investigation will be conducted to confirm the assumptions used for the preliminary pavement design. There will be full access to the site at the intersection of 175th Avenue and Twin Lakes Road. The northern access to the site will be right in/right out only. The existing median in Twin Lakes Road will not be opened due to the proximity to other full access intersections and the sight distance along Twin Lakes Road. The proposed street section is shown on Exhibit 3. Sanitary Sewer Sanitary sewer improvements will include extending gravity sewer from the existing stub at the intersection of 175th Avenue and Twin Lakes Road. The sanitary sewer will consist of 8 inch main with 6 inch service to all proposed lots. Gravity sewer will be extended at minimum grade to provide service to all proposed lots The proposed sanitary sewer improvements are shown on Exhibit 4. Watermain Watermain improvements loop through the property from the existing stub at the intersection of 175th Avenue and Twin Lakes Road; and terminate north of the property, tying into an existing stub off of Twin Lakes Road. An easement from Elk River Business Park for the northerly watermain connection will be required. The proposed watermain will be 8 inch ductile iron pipe (DIP) main, 8 inch DIP service to all proposed lots, and 6 inch DIP to all fire hydrants. Fire hydrants will be spaced along the roadway to provide adequate coverage of the fronts of the lots. A site by site review will be conducted as lots develop to determine if additional fire hydrants are needed. The proposed watermain improvements are shown on Exhibit 4. Storm Sewer The existing regional storm water pond adjacent to Lot 1 in the northern part of the property will be expanded to the east to accommodate all ponding requirements for the development when fully built out. Storm sewer improvements will extend from southern part of the property along the road right-of-way and ultimately outlet to the expanded regional pond. The storm sewer system will be designed for a 10-year rainfall event; 2