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Oliver Surveying & Engineering, Inc. <br /> y g g g� <br /> Land Surveying • Civil Engineering •Land Planning <br /> October 30, 2013 <br /> Mr. Zachary Carlton <br /> Planning Intern <br /> City of Elk River <br /> 13065 Orono Parkway <br /> Elk River,MN 55330 <br /> Re: Heritage Maples <br /> Dear Mr. Carlton: <br /> We have made the corrections and modifications to the drawings and supporting documentation <br /> as requested in Mr. Barnhart's September 17,2013 letter to the applicant: <br /> • We have added topography and a future layout for the west side of the project site. This <br /> information is based on the previously proposed plans prepared by others some time ago. <br /> The applicant feels it is still a viable concept. <br /> • We have had the previously delineated wetland confirmed by Wenck Associates, Inc. A <br /> copy of the report is attached. <br /> • We have confirmed the drainage concepts for the future work and have attached the <br /> drainage calculations. <br /> • We have included a revised landscape plan signed by a registered professional landscape <br /> architect. <br /> Engineering & Water <br /> 1. Our drainage calculations include the storm event values contained in the Atlas 14 <br /> precipitation data. Rate control is achieved for both the proposed improvements and the <br /> future development. Volume control is provided for 1" depth over new impervious <br /> surface for the proposed site via the two areas labeled as rain garden. <br /> 2. We have added contour information for the adjacent property to the west. <br /> 3. We have shown the ditch along Highway 10 as now having positive drainage to the west. <br /> 4. The contours for the pond have been modified as requested and are not into the sidewalk. <br /> 5. The retaining wall of concern was not moved out of the right-of-way. We respectfully <br /> request consideration to let it remain as shown due to the need for pond storage. We <br /> envision the retaining wall (s) to be constructed of modular block available from many <br /> vendors. <br /> 6. Response from applicant. <br /> 7. The wetland report is attached. <br /> Environmental <br /> 8. The ponding provides the required permanent storage, water quality volume and <br /> discharge control together with the required rate control and volume for the 100 year <br /> event. <br /> 580 Dodge Avenue •Elk River; MN 55330 . 763.441.2072 •fac. 763.441.5665 • www.oliver-se.com <br />