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The Burlington Northern Santa-Fe (BNSF) rail line borders the study area extending <br />from the northwest to the southeast, and carries a large number of heavy rail trains <br />each day in addition to the Northstar commuter train. The Northstar commuter <br />train station is located to the north of the study area, and is located approximately <br />two miles from Downtown Elk River to the northwest. <br />C. Anticipated Infrastructure <br />To accommodate any development of this site, municipal sewer and water will need <br />to be extended to the site. Additionally, transportation infrastructure and storm <br />water management facilities will be needed. These improvements are summarized <br />below. <br />Wastewater <br />To address the needed infrastructure to accommodate the sewer system, <br />wastewater from the west side of TH 10 would be conveyed north through a new <br />sanitary sewer line to the existing 15-inch sewer that crosses TH 10 just north of <br />170th Avenue. Under Scenarios 1 and 2 a 10-inch diameter gravity sewer line <br />would have sufficient capacity to carry the projected peak hour wastewater <br />flows from the portion of the study area west of TH 10, plus potential flow from <br />future development south of the study area. Under Scenario 3 a 15-inch gravity <br />sewer line would be required. For Scenario 1 a 10-inch diameter sewer would <br />be recommended to serve the area along the west side of TH 10. For Scenarios 2 <br />and 3 a 15-inch gravity sewer line would be needed to carry the projected flows <br />west of TH 10 to allow for potential future development south of the study area. <br />Wastewater from the east side of the study area between TH 10 and the <br />Burlington Northern Railroad could be conveyed north and connected to the <br />existing 15-inch sewer just south of 171St Avenue that extends north to 173rd <br />Avenue. For all three scenarios, a 10-inch gravity sewer would be large enough <br />to convey the estimated peak hour flow from the portion of the study area <br />between TH 10 and the Burlington Northern Railroad. However, because the <br />current urban service area boundaries extend beyond the limits of the study <br />area, a 12-inch sanitary sewer is recommended to provide additional capacity <br />for future development. <br />Water Supply <br />Watermain will be required to be extended within the study area to provide <br />sufficient fire flow. It is recommended that a 16-inch diameter watermain is <br />extended south from the existing 16-inch diameter watermain within the TH 10 <br />right-of-way at 171St Avenue. The 16-inch diameter watermain should be <br />extended through the west portion of the development ideally within aCity-owned <br />right-of-way. It could then be downsized to a 12-inch diameter on the east side of <br />TH 10 within the 165th Avenue right-of-way. The 12-inch diameter watermain <br />should then be looped within the eastern portion of the development and <br />connected to the existing 16-inch watermain within 171St Avenue. The remaining <br />looping could be accomplished with 8-inch diameter watermain. <br />City of Elk River <br />Draft Alternative Urban Areawide Review <br />July 2011 <br />Page 21 of 84 <br />