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June 22, 2009 <br />Ms. Evelyn Turner <br />Planner <br />City of Orono <br />Post Office Box 66 <br />Crystal Bay, MN 55323 <br />Re: 1636 Bohns Point Road <br />File No. 000139-09000-1 <br />Plat No. 09-3417 <br />Dear Evelyn: <br />2335 Highway 36 W <br />St. Paul, MN 55113 <br />Tel 651-636-4600 <br />Fax 651-636-1311 <br />www.bonestroo.com <br />-#eonestroo <br />We have reviewed the grading plan for the construction of a new house addition dated 6-6-09. <br />The plan includes raising the existing driveway approximately 4.5 feet near the planned addition. <br />We have the following comments with regards to engineering matters: <br />• Raising the driveway will cause runoff to flow to the east to a low point in the driveway <br />then to the north and on to the neighboring property. This runoff should be managed <br />on-site to the lake. <br />• Alternatively, since the runoff appears to fairly well managed on the neighboring <br />property, the applicant may wish to consider obtaining a drainage easement from 1629 <br />Bohns Point Road and proceed with the current grading plan. <br />• The proposed retaining wall is over four feet in height near the proposed garage. An <br />engineered design and details should be provided for all retaining walls greater than 4 <br />feet in height, or for tiered walls whose horizontal separation is less than two times the <br />height of the wall. <br />• The applicant will need to provide a Storm Water Pollution Prevention Plan as required by <br />Orono's Land Use Code Chapter 79, Section 79-7(c). <br />If you have any questions please call me at (651) 604-4894. <br />Yours very truly, <br />Bonestroo <br />r--------\_ <br />)-_) ~ <br />Darren Amundsen <br />Cc: Tom Kellogg