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2335 Highway 36 W <br /> St. Paul, MN 55113 <br /> Tel 651-636-4600 <br /> Fax 651-636-1311 <br /> www.bonestroo.com <br /> �uiy is, zoii � Bonestroo <br /> Ms. Melanie Curtis <br /> Planning &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. 000139-11000-1 <br /> Building Permit No. 11-00598 <br /> Dear Melanie: <br /> We have reviewed the plan for the proposed house and garage located at 3315 Graham Hill <br /> Road. The plan is dated July 6, 2011. We have the following comments with regards to <br /> engineering matters: <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 owner for this permit. <br /> • It appears the project will disturb approximately 0.75 acres. Therefore, an NPDES <br /> General Stormwater Permit from the MPCA will not be required. <br /> • A permit will be required from the Minnehaha Creek Watershed District. A copy of this <br /> permit should be sent to the City. <br /> • The elevations along the front of the house should be raised above 1024.0 to provide <br /> drainage away from the house. <br /> • The size, type, and invert elevations for the proposed culvert should be shown on the <br /> plans. It may be necessary to make the ditch deeper to provide adequate cover over the <br /> pipe. <br /> • The short retaining wall that extends northwest from the northwest corner of the house <br /> appears to be 6 feet in height. 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 /> If you have any questions, please call me at (651) 604-4894. <br /> Sincerely, <br /> BO N ESTROO <br /> � �--�� <br /> I <br /> Darren Amundsen <br /> Cc: Tom Kellogg <br />