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Bonestroo <br />Rosene <br />vn ■ Anderlik & <br />|\ I Associates <br />Engineers & Architects <br />January 5,2000 <br />Wendy Boltcnbcrg <br />Assistant Zoning Administrator <br />City of Orono <br />Post Office Box 66 <br />Crystal Bay. MN 55323 <br />Re: Katherine Taylor Site Plan <br />File No. 139-2539 <br />Bonestroo. Rosene. Anderhk ,md AssooMes. inc is dn AffirmMive Action Bqu^t Opportunity Employer <br />Principals Otto G Boneitroo. PE • Joseph C Anderlik. PE • Viirvin L SorvaM. PE. • <br />Glenn R Cook. PE • Robert G Schunicht. PE • Jerry A Bourdon. PE • <br />Robert W Rosene. PE. Richard E Turner, PE. and Susan M Eberlin. C PA . Senior Consultants <br />Assoa^ite Principals Howard A Sanford. PE • Keith A. Gordcr' PE • Robert R Pfefferle. PE • <br />Richard W Foster. PE • David O LosKota. PE • Robert C Russek. A IA • Mark A. Hanson. PE • <br />Michael T Rautmann. PE • Ted K Field. PE • Kenneth P Anderson. PE • Mark R. Rolfs. PE. • <br />Sidney P Williamson. PE. L S • Robert F Kotsmith • Agnes M Ring • Allan Rick Schmidt. PE. <br />Offices St. Paul. Rochester. Willmar and St Cloud. MN • Milwaukee Wl <br />WeOsite WWW bonestroo com <br />Dear Wendy: <br />We have reviewed the site plan (revised 12/28/99) for the proposed improvements on the Sundet property. The site is <br />located on the east side of C.S.A.H. 135 (Tonkawa Road) in the southwest quarter of Section 5. We have the following <br />comments in regards to engineering matters. <br />• The proposed driveway grades have been revised to 12% with a 1.7% landing area provided along Tonkawa Road. <br />The driveway is steeper than we recommend but is acceptable as shown. The plans .should identify proposed <br />diiveway surfacing and curb and gutter. <br />• The cross sections provided show grading within 5 feet of the property lines. The plans show that the existing <br />retaining wall on the south side of the property may need to be replaced. It still may be necessary to acquire <br />easements from the neighbors to allow for retaining wall replacement or storage of excavated materials. <br />• The proposed storm sewer design raises the following questions that need to be answered: <br />1. How will silt be kept out of the drainfield? <br />2. What soil identif :ation or percolation tests have been performed in the proposed drainfield area? Th s <br />information shoulu be submitted for review with the final storm system design. <br />3. How will the system work in the winter? What provisions have been made to accommodate flows if the system <br />plugs up? <br />4. What storm event is the drainfield designed for? We recomr.iend that the minimum drainfield storage capaciiv <br />be for a one year storm event. <br />5. What is the top elevation of the rock bed? <br />6. Has the existing sanitary sewer, located approximately where the proposed drainfield is shown, been accounted <br />for? The location and elevation of the existing sewer should be verified and shown in both plan and profile <br />views. <br />7. What is the maintenance plan or schedule for the storm system? It is critical that a maintenance plan be <br />developed and followed so that th: system continues to function as designed. <br />8. The property owner should be aware that erosion problems are likely and will need to be repaired as they occur. <br />Details should be provided for the proposed retaining wall. <br />The plans should provide additional erosion control measures in disturbed areas due to the steep slopes on the site. <br />At a minimum, disturbed areas should be restored immediately with staked sod cr seed and fiber blanket. <br />Please contact me at (651) 604-4863 if you have any questions regarding this matter. <br />Yours very truly, <br />BONESTROO, ROSENE, ANDERLIK & ASSOCIAfES, INC. <br />Tom Kellogg <br />Cc: Greg Gappa, City of Orono <br />2335 West Highway 36 ■ St. Paul, MN 55113 > 651636-4600 • Fax: 651-636-1311