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` Stantec Consulting Services Inc. <br /> ✓� 2335 Highway 36 West <br /> St. Paul MN 55113 <br /> � Tel: (651)636-4600 <br /> Fax: (651)636-1311 <br /> 5tantec <br /> February 14, 2012 <br /> Melanie Curtis <br /> Planning and Zoning Coordinator <br /> City of Orono <br /> Post Office Box 66 <br /> Crystal Bay, MN 55323 <br /> Re: 75 Leaf Street <br /> File No. 1938000285.170 <br /> File No. 2012-00070 <br /> Dear Melanie: <br /> We have reviewed the plans for the proposed new home construction at 75 Leaf Street. The site plans are <br /> dated 2-1-12 and 1-17-12. We have the following comments with regards to engineering matters: <br /> • The proposed tiered retaining walls on the west side of the house are in eight feet high. Engineered <br /> design and details should be submitted for review and approval for all retaining walls over four in <br /> height, and for all tiered walls with a separation of less than two times the wall height. <br /> • We recommend that the house plan set site plan and certificate of survey grading plan provide a <br /> coordinated driveway plan at Leaf Street. The plans should not contain retaining walls with the right <br /> of way and provide additional information on drainage and a culvert. <br /> • The city should assume that the overall wetland buffer requirements from the Graham Hill Preserve <br /> Plat have not been completed. In general, work on this property would include invasive species <br /> removal, native seeding, maintenance, and signing of the buffer areas. <br /> • This project will disturb more than 100 CY of material. Sediment and erosion control information <br /> meeting the requirements of Orono's City Code 79-7(c)(2) must be submitted. The minimum $2000 <br /> sediment and erosion control financial security should be required of the owner for this permit. <br /> If you have any questions, please call me at(651) 604-4894 or send an email to <br /> darren.amundsen(a�stantec.com. <br /> Sincerely, <br /> Stantec <br /> � . � . <br /> Darren Amundsen <br /> cc: Chris Mattson <br />