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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 /> November 23, 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: 3355 Graham Hill Road <br /> File No. 000139-09000-2 <br /> File No. 2009-0805 <br /> Dear Melanie: <br /> We have reviewed the plans for a proposed new home construction at 3355 Graham Hill Road. <br /> The plans are dated 11-08-09 with an emailed updated version received 11-20-09. We have the <br /> following comments with regards to engineering matters: <br /> • It appears that the proposed retaining wall on the southeast side of the house is <br /> approximately 6 feet high. Engineered design and details should be submitted for review <br /> and approval for all retaining walls over four in height, and for all tiered walls with a <br /> separation of less than two times the wall height. <br /> • It is our understanding that the retaining wall around the driveway is a cast-in-place <br /> concrete wall integrai to the house foundation. This design will be reviewed by the City <br /> Building Official. <br /> • This project will disturb more than 100 CY of material. Sediment and erosion controi <br /> information meeting the requirements of Orono's City Code 79-7(c)(z) must be <br /> submitted. The minimum $2000 sediment and erosion control financial security should <br /> 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@bonestroo.com. <br /> Yours very truly, <br /> �--�:..._�_��--�-�� <br /> � <br /> Darren Amundsen <br /> Cc: Tom Kellogg <br />