7.3. SR 05-13-2002 - Laserfiche WebLink

Home Browse Search

Howard R. Green Company Project No. 806550J Feasibility Study 175th Avenue Improvements City of Elk River SanitarF Sewer The proposed sanitary sewer improvement, as shown on Exhibit 3, consists of extending an 8-inch sanitary sewer main east along 175th Avenue to the western edge of Park Pointe Addition. This sanitary sewer line will be constructed at minimum grade to try to maximize the area of service. Sanitary sewer stubs and services will be placed to the north and south along 175th Avenue to allow for future connections of the residences that abut 175th Avenue, or future development to the south. Waterrnain The proposed watermain improvement, as shown on Exhibit 3, includes the installation of a 16-inch trunk watermain east along 175th Avenue to the western edge of Park Pointe. Watermain stubs and services will be placed to the north and south along 175th Avenue to allow for future connections of the existing residences or future development to the south. Modeling of the proposed water improvements was completed using Cybernet software to verify proposed sizing of the watermain. The two criteria used when modeling the system were a fire flow of 3,500 gallons per minute (gpm) and residual pressure of 20 pounds per square inch (psi). The Insurance Services Office (ISO) requires that fire flows for industrial and commercial areas meet or exceed 3,500 gpm with a residual pressure of 20 psi or greater in the system. Modeling of the system with the proposed trunk watermain sizing produced results that satisfied the above criteria. Storm Drainage Ditches will be constructed adjacent to the roadway to convey stormwater flow. Water will be directed to proposed ponds within the Park Pointe Development or to a former County Ditch system that conveys water to the south and west, ultimately flowing into the Mississippi River. Culverts will be placed under driveways and connecting roads where necessary. 4