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j fl j Bon e stroo e Rosene '11 Anderlik & 1 \j 1 Associates 2: 'X/est H ig hway 36 • St . Paul, MN 55 11 3 Office: 6 51-636-4600 • Fax: 65 1-636-13 11 www.bonestroo.com En gi nee r s & Architects November 30, 2004 Ms . Janice Gundlach Planner City of Orono Post Office Box 66 Crystal Bay, MN 55323 Re: 1625 Bohns Point Road File No. 139-04-000 Plat No . 04-3042 Dear Janice: We have reviewed the revised grading plans dated 11-23-04 prepared by David Tupper and Associates for the home constructed at 1625 Bohns Point Road. The grading plan includes as-built survey information provided by Gronberg and Associates . Proposed revisions to the grading include construction of swales along the north lot line to convey storm water in accordance with the previously approved building permit grading plan. We have the following comments with regards to engineering matters: SbeetL5 • The proposed swale along the north lot line from the high point (940.50) westerly should be extended to the 934 . contour. Grading of the 934 contour should direct storm water southwesterly across the subject property and not onto the property to the north. • Notes pertaining to the draintile installation in the swale and associated rock backfill should include language that states the rock backfill in the draintile trench shall be at an elevation that is no higher than 1-foot below the top of the swale to prevent water from flowing north. • The grading plan should include proposed swale grading easterly from the high point (940.50) beginning at the 940 contour to convey storm water on the subject property towards the existing pond. Sheet L6 • As noted above , the swale along the north lot line should be graded easterly beginning at the 940 contour and tie into the proposed swale grading shown at the 935 contour. General • Once the grading and associated restoration is completed a revised as-built drawing should be provided to the city for review and approval. • Silt fence and any other necessary erosion control measures should be installed, inspected and approved by city staff prior to any work on site. If you have any questions please call me at (651) 604-4863 . Yours very truly, BONESTROO, ROSENE, ANDERLIK & ASSOCIATES, INC. Cc: Greg Gappa, City of Orono Bruce Vang, City of Orono • St. Pau l , St. Cloud , Rochester, Wi ll mar, MN • M il waui<ee, WI • Ch i cago, I L Affirmative Action/Equa l Opportunity Employer and Employee Owned