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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 /> �Bonestroo <br /> September 16, 2008 <br /> Ms. Evelyn Turner <br /> Planner <br /> City of Orono <br /> Post Office Box 66 <br /> Crystal Bay, MN 55323 <br /> Re: 520 North Arm Drive <br /> File No. 000139-08000-2 <br /> File No. 2008-00142 <br /> Dear Evelyn; <br /> We have reviewed the grading plan for 520 North Arm Drive, dated 8-15-08. The plans proposed to remove <br /> an existing home and construct a new home with an attached garage. We have the following comments <br /> with regards to engineering matters: <br /> • The survey should show the existing home and garage, if they are still standing. <br /> • Existing contours should be provided for the entire lot, including over the driveway. Contours <br /> should extend at least 50' beyond all property lines. <br /> • All proposed grading should be shown on the survey. It appears all contours currently shown are <br /> existing. <br /> • Detailed and engineered retaining wall design and details should be submitted for all retaining <br /> walls over 4' in height. This would apply to the proposed wall to the north of the garage, <br /> • All trees to be removed should be labeled. <br /> • A detail for silt fence with steel T-posts should be shown on the plans. <br /> • There are two manholes shown to the south of the garage, More information is needed for these <br /> manholes, including what type of manholes they are, inverts, type, size, and direction of any pipe <br /> connected to the manholes. <br /> • lohn Smyth has reviewed and submitted comments on this application regarding wetland buffer <br /> requirements. His memo dated 9-11-08 is attached, <br />