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<br />Memorandum <br /> <br />To: Katie Larsen, City Planner, City of Lino Lakes <br />From: Kelsey Gelhar, WSB & Associates <br /> Diane Hankee, City Engineer, City of Lino Lakes <br /> <br />Date: April 27, 2020 <br />Re: Nadeau Acres Preliminary Plat Review 15306-000 <br /> <br />WSB has reviewed the Preliminary Plat and Utility Plans for the Nadeau Acres development in Lino Lakes, <br />MN, prepared by Carlson McCain. These comments are based on review of the following plan sets and <br />documents: <br /> <br />• Nadeau Acres Civil Plan Set prepared by Carlson McCain dated March 20, 2020 <br />• Stormwater Management Plan prepared by Carlson McCain dated December 6, 2019, and revised March <br />20, 2020. <br />• Turn Lane Exhibit prepared by Carlson McCain received March 30, 2020 <br />• Turn Lane Grading Exhibit prepared by Carlson McCain received March 30, 2020 <br /> <br />Carlson McCain responded to these comments in red. WSB reviewed the following and responded to Carlson <br />McCain’s comments in blue: <br /> <br />Engineering <br /> <br />• Grading <br /> <br />The Nadeau Acres development includes site grading for Red Oak Lane, Heritage Avenue, Josephine Court, <br />Norma Way, and William Lane as well as the grading required for building pads, and Ponds 100, 200, and <br />400. Four retaining walls are proposed on the site. <br /> <br />Comments: <br />1. Add additional labels to both existing and proposed contours. <br />Labels added. <br />2. Retaining walls #1 & #4 shall be eliminated and the applicant shall obtain temporary grading <br />easements with adjacent property owners or the applicant shall adjust the grading plans to <br />eliminate the need for the walls. <br />Retaining wall #1 revised. This wall cannot be removed entirely due to the lift station location <br />and the unlikelihood of obtaining a grading easement from adjacent owner. This wall can be <br />removed with future development to the north. Retaining Wall #4 removed and grading revised <br />to maintain all grading on-site. Developer looking into the possibility of removing walls 2 & 3 if <br />adjacent owner will allow slope grading onto their property. <br />Retaining wall #1 eliminated due to new lift station location. <br />3. Additional topographic information is needed (minimum 100’ beyond preliminary plat boundary, <br />including at the extensions of Red Oak Lane, Heritage Avenue, William Lane) <br />Lidar added to existing topo to show this area. <br />Current page layout does not show 100’ beyond the north limit of the project site. <br />4. Retaining walls #2 and #3 (now #1 and #2) exceed maximum allowed height. All retaining walls over <br />4-ft tall require structural design. <br />Noted. These walls will be designed by a structural engineer and plans provided by the contractor. <br />How will the retaining walls be maintained in the future? <br />5. Additional rear yard drainage and utility easement required on Lot 145. <br />Lots revised so no drainage from adjacent lot drains into Lot 145.