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2335 Highway 36 W St Paul, MN 55113 Tel 651-636-4600 Fax 651-636-1311 www.bonestroo.com October 7, 2008 Ms. Evelyn Turner Planner ♦eonestroo City of Orono Post Office Box 66 Crystal Bay, MN 55323 Re: 2623 Casco Point Road File No. 000139-08000-1 Plat No. 08-3367 Dear Evelyn: We have reviewed the proposed grading plan for 2623 Casco Point Road dated 9-29-08. The plans propose to rebuild a single family home with a new attached garage. We have the following comments with regards to engineering matters: • The proposed 942 contour to the west of the house crosses the 940 contour line. The grading should be revised in this area. The maximum allowable slope is 3: 1. • Plans should be revised along the south property line in the area of the 942 contour to show a maximum slope of 3: 1. • More information, such as spot elevations, should be provided along the proposed driveway to indicate how it will drain. • Engineered design drawings will need to be provided for review for all retaining walls over 4 feet in height. In this case, any loading issues with the storm sewer passing under or through the retaining wall should be addressed. • The proposed catch basin type, pipe size, material, slope, end treatment, and invert elevations should be provided for the storm sewer. Storm sewer calculations should be submitted for review showing the system's ability to adequately protect the home from flooding. • The plan should indicate some form of energy dissipation to be used at the outlet of the storm sewer on the lake side of the house. • The MH shown near the driveway should be identified and any inlets and outlets should be shown on the plans, along with elevations. • The existing and proposed sewer and water services are not shown on the plans. The location of these services should be included in the plans. If you have any questions, please call me at (651) 604-4894. Yours very truly, Darren Amundsen Cc: Tom Kellogg