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1/ J Bonestroo Rosene ■ Anderlik & ^ \ Associates Engineers & Architects January 5, 2000 Wendy Boltcnberg Assistant Zoning Administrator City of Orono Post Office Box 66 Crystal Bay. MN 55323 Re: Katherine Taylor Site Plan File No. 139-2539 Bonestroo. Rosene AneJerhk Associates, .rc is an Affirmative Action Equal Opportunity Employer Principals Otto G Bone'.troo. PE • Joseph C Anderlik. PE • M.uvm L Sorvolti. PE • Glenn P Cook, PE • Pobert G Srhumcht. P£ • Jerry A Bourdon. PE • Robert W Rosene. PE . Pich*ird E Turner. P£ and Susan V. Eberlin. C PA . Senior Consultants Associate Principals Howard A Sanford. PE • Keith A Gordon, PE. • Robert P Pfefferle. PE • Richard W Foster. PE • David O Loskota. P£ • Robert C Russek. Al A • Mark A. Hanson. PE • Michael T Rauimann, PE • Ted K Field. PE • Kenneth P Anderson. PE • Mark R Rolfs. PE. • Sidney P Williamson. PE . L S • Robert F Kcts“:th • Agnes M. Ring • Allan Rick Schmidt. PE. Offices St Paul. Rochester. Willmar and St C oud. MN • Milwaukee. Wl WeOsite w .v .v bonestroo com Dear Wendy: We have reviewed the site plan (revised 12/28/99) for the proposed improvements on the Sundet property. The site is located on the east side of C.S.A.H. 135 (Tonkawa Road) in the southwest quarter of Section 5. We have the following comments in regards to engineering matters. • The proposed driveway grades have been revised to 12% with a 1.7% landing area provided along Tonkawa Road. The driveway is steeper than we recommend but is acceptable as shown. The plans should identify proposed driveway surfacing and curb and gutter. • The cross sections provided show grading within 5 feet of the property lines. The plans show that the existing retaining wall on the south side of the property may need to be replaced. It still may be necessary to acquire easements from the neighbors to allow for .laining wall replacement or storage of excavated materials. • The proposed storm sewer design rai.ses the following questions that need to be answered: 1. How will silt be kept out of the drainfield? 2. What soil identification or percolation tests have been performed in the proposed drainfield area? This information should be submitted for review with the final storm system design. 3. How will the system work in the winter? What provisions have been made to accommodate flows if the system plugs up? 4. What storm event is the drainfield designed for? We recommend that the minimum drainfield storage capacity be for a one year storm event. What is the top elevation of the rock bed? H.XS the existing sanitary sewer, located approximcitely where the proposed drainfield is shown, been accounted for? The location and elevation of the existing sewer should be venfied and shown in both plan and profile views. 7. What is the maintenance plan or schedule for the storm system? It is critical that a maintenance plan be developed and followed so that the system continues to function as designed. 8. The property owner should be aware that erosion problems are likely and will need to be repaired as they occur. Details should be provided for the proposed retaining wall. The plans should provide additional erosion conuol measures in disturbed areas due to the steep slopes on the site. At a minimum, disturbed areas should be restored immediately with staked sod or seed and fiber blanket. 5. 6. Plca.se contact me at (651) 604-4863 if you have an> questions regarding this matter. Yours very truly. BONESTROO. ROSENE. ANDERLIK A AS.SOCIAFES. INC. f/ Tom Kellogg Cc: Greg Gappa. City of Orono 2335 West Highway 36 > St. Paul, MN 55113 > 651*636*4600 • Fax: 651*636*1311