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Memorandum <br />www.srfconsulting.com <br />3701 Wayzata Boulevard, Suite 100 | Minneapolis, MN 55416-3791 | 763.475.0010 <br />Equal Employment Opportunity / Affirmative Action Employer <br />SRF No. 13725 <br />To: Justin Femrite, PE <br />City of Elk River <br />From: Nate Will, PE <br />Date: December 13, 2021 <br />Subject: City Trail Addition along CSAH 33 from TH 169 to CSAH 13, Sherburne County <br />Copied: David Roedel, PE <br />Sherburne County <br /> <br />In response to our discussions related to the addition of a City Trail, the following information <br />documents our understanding of the location and design criteria that relates to the City Trail. <br />Included with this memo is an exhibit of the roadway that shows how the City Trail would likely fit <br />along the south side of CSAH 33 and shows a comparison of the approximate additional preliminary <br />construction limit impacts for both the rural ditch option (current 30% design) and with the addition <br />of the 10-foot trail. Also included are the conceptual cross sections and a copy of the preliminary <br />construction estimate. <br /> <br />Criteria used to add City Trail along CSAH 33: <br />1. Add concrete curb and gutter paralleling the south shoulder edge of CASH 33. <br />a. High speed road use 4-inch curb height. <br />b. Use B424 concrete curb and gutter. <br />c. Maintain 8-foot shoulder width measured from travel lane to face of curb. <br />2. Maintain a 10-foot boulevard measured from face of curb to north edge of trail. <br />a. Exceptions to this will be along right turn lanes upon approaching an intersection. <br />i. The Bikeway Manual offers guidance to reduce the boulevard to 6-foot minimum for <br />roadways with design speeds of 50 and 55 mph at side street intersections. In extreme <br />situations, further reduction of the boulevard to 2.67 feet (2 feet from back of curb to <br />trail) is allowed. Additional evaluation and coordination with both the County and City <br />is needed to finalize the design at the side street intersections to maximize safety while <br />minimizing impacts to adjacent properties. <br />· The attached layout currently shows a 6-foot boulevard along the right turn lanes.