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r <br />l/l Bonestroo <br />Rosene <br />AncterHk& <br />Ivll Associates <br />Cnglnctrs 4 Architects <br />2335 VMest Highway 36 • St Paul, MN 55113 <br />Office: 651-636-4600 • Fax: 65I-636-I3II <br />wwwl>onestrooxom <br />August 8,200S <br />Ms. Janice Gundlach <br />Planner <br />City of Orono <br />Post Office Box 66 <br />Crystal Bay. MN 55323 <br />774 Tonkawa Road <br />File No. 000139-051 <br />Plat No. 05-3143 <br />Dear Janice: <br />We have reviewed the site plans dated 8-3-05 for the proposed improvements to 774 Tonkawa Road. <br />The site improvements include the construction of a new home and associated grading. We have the <br />following comments with regards to engineering matters: <br />The existing survey shows a swale along the south side of the existing home that conveys <br />water towards the lake. The proposed grading plan eliminates this swale. A revised grading <br />plan should be provided that maintains the existing swale along the south side of the home. <br />The proposed swale along the north side of the home should be extended to the proposed 958 <br />contour shown on the lake side of the home. <br />The swale shown along the north side of the home approaches grades of 25%. Swales that <br />exceed 5% are susceptible to erosion issues. Final plans should include swale stabilization <br />details for all swales that exceed 5%. <br />It appears that water north of the proposed garage will drain northerly towards the neighbor’s <br />garage. Final grading plans should include a design to direct storm water from this area <br />towards the roadway and not onto the neighboring property. <br />Final plans should include erosion and sediment control details. <br />If you have any questions please call me at (651) 604-4863. <br />Yours very truly, <br />BONESTROO, ROSENE, ANDERLDC & ASSOCIATES, INC. <br />Tom Kellogg <br />Cc: Greg Oappa, City of Oroiio <br />St. Paul. St. Cloud. Rochester. MN • Milwaukee. Wl ■ Chicago. IL