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2335 Highway 36 W <br /> St.Paul,MN 55113 <br /> Te1651-636-4600 <br /> fax 651-636-1311 <br /> www,bonestroo.com <br /> July 19, zoo� � Bonestroo <br /> Ms. Melanie Curtis <br /> Planner <br /> City of Orono <br /> Post Office Box 66 <br /> Crystal Bay, MN 55323 <br /> Re: 3135 Casco Circle <br /> File No. 000139-07000-1 <br /> Plat No. 07-3270 <br /> Dear Melanie: <br /> We have reviewed the revised survey for the property at 3135 Casco Circle, dated 6/25/07. We have the <br /> following comments with regards to engineering matters: <br /> • Slopes exceed 3:1 in the area just northwest of the existing house and proposed retaining wall, <br /> • The proposed retaining wall at the northwest corner of the existing house is restricting the swale <br /> width to approximately two feet. At a minimum, the outside edge of the retaining wall should be <br /> in line with the existing house to allow for a consistent swale width along the west side of the <br /> house. <br /> • With the proximity to of the egress retaining wall to the drainage swale, the applicant should <br /> consider not using a boulder wall. We would recommend a cast-in-place wall that could be <br /> extended above ground providing greater protection from flooding. <br /> • There is a 3-foot diameter maple tree in the middle of the proposed drainage swale along the west <br /> lot line, If this tree is to remain, runoff will be directed to the neighboring property, squeezed <br /> between the tree and proposed home, or a combination of the two. <br /> • Final plans should include erosion and sediment control details. <br /> If you have any questions, please call me at(651) 604-4894, <br /> Yours very truly, <br /> BON ESTR00 <br /> �- -. <br /> �`f—� �_� <br /> Darren Amundsen <br /> Cc: Tom Kellogg <br />