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2335 Highway 36 W <br /> St Paul,MN 55113 <br /> Te1651-636-4600 <br /> Fax 651-636-1311 <br /> www.banestroo com <br /> September 1, 2009 # Bonestroo <br /> Ms. Melanie Curtis <br /> Planning and Zoning Coordinator <br /> City of Orono <br /> Post Office Box 66 <br /> Crystal Bay, MN 55323 <br /> Re: 3315 Graham Hill Road <br /> File No. 000139-09000-1 <br /> File No. 2009-0529 <br /> Dear Melanie: <br /> We have reviewed the plans for a proposed new home construction at 3315 Graham Hill Road. <br /> The plans are dated 8-25-09. We have the following comments with regards to engineering <br /> matters: <br /> • It appears that the proposed retaining wall on the south side of the house and driveway <br /> is approximately 8 feet high. Engineered design and details should be submitted for <br /> review and approval for all retaining walls over four in height, and for all tiered walls with <br /> a separation of less than two times the wall height. <br /> • The plans must show existing contours at least 50 feet on to the surrounding properties. <br /> • The 1024 through 1014 design contours simply do not tie into the existing contours <br /> along the north lot line and must be revised. When doing so, please note that any part <br /> of a retaining wail is not allowed in drainage and utility easements. <br /> • The grading plan should show the ditch and drainage patterns along Graham Hill Road. <br /> The current plan shows this area draining to the 3285 Graham Hill Road driveway. <br /> • This project will disturb more than 100 CY of material. Sediment and erosion control <br /> information meeting the requirements of Orono's City Code 79-7(c)(2) must be <br /> submitted. The minimum $2000 sediment and erosion control financial security should <br /> be required of the applicant for this permit. <br /> If you have any questions, please call me at(651) 604-4894. <br /> Yours very truly, <br /> f—�. ;��1�� <br /> Darren Amundsen <br /> Cc: Tom Kellogg <br />