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15 1/1 Bonestroo Rosene Ande rlik & |\J I Associates Engineers & Architects August 15,2000 Mr. Paul Weinberger Zoning Administrator/Planner City of Orono Post Office Box 66 Crystal Bay, MN 55323-0066 Re: Brenshell Homes 6-Lot Subdivision @ Garden Lane BRA File No. 139-2596 Bonestroo. Poiene. Anderlik and Associates. Inc. Is an Affirmative Action/Equal Opporlunicy Employer and Employee Owned Principals: Otto G Bonestroo, PE • Marvin L Sorvaia. PE • Gienr ? Cook. PE • Robert G Schunichf. PE • Jerry A Bourdcn. PE Senior Consultants: RoOert W Rosene PE • Joseph C Anderfik. PE • Richard E Turner. PE • Susan .M, E&ertin. C PA. Associate Principals: Howard A. Sanford. PE • Keith A Gordon. PE . Robert R. Pfef.'erle. PE • Richard W Poster. PE • David O Loskota. PE • Robert C Russek. A i A. • Mark A Hanson. PE • K* chaei T Rautmann. PE • Ted K Field PE • Kenneth P Anderson. PE. • Mark R Rolfs. PE. • David A. Bonestroo. MBA* Sidney P W.itiamson PE. L S • Agnes M Rmg. MBA* Allan Rick Sc^*- Offices: St Paul. St. Cloud Rochester and Wiiimar. MN • Milwaukee. Wl M^bsite: wwwbcnestroo com r:. PE Dear Paul: We have reviewed the preliminary plat for the proposed six-lot subdivision for Brenshell Homes. The site is located east of Garden Lane and west of Wildhurst Trail in the west half of Section 7. We have the following comments in regards to engineering matters. 1.Utilities: The proposed sanitary sewer installation raises some concerns. Sewer is proposed to be installed in an existing steep slope between Lots 2 and 3 and also down the center of Wildhurst Trail. Disturbance of the steep slope is a serious erosion concern. Installation of the sewer in Wildhurst Trail will require the removal of the entire driving surface making through traffic difficult if not impossible. We strongly recommend that the portions of the sewer between Lots 2 and 3 and the segment along Wildhurst Trail be directionally bored to prevent disturbance to the steep slopes and allow for through traffic during construction. Final plans should include plan and profile views of the sanitary sewer. Record plans should be provided to the City upon project completion. City standard details should be included in the plan set. 2.Streets: Plans should include a typical street section. A geotechnical analysis, R-value recommendation and pavement design calculations should be submitted for review. It appears that the street will be an urban section with curb and gutter. All curb and gutter shall be concrete, no bituminous curb is allowed. The fire chief should review and comment on the proposed hammer handle tum-around on Garden Lane. The chief should also look at the proposed driveway alignment to serve Lot 5. Recent discussions with local firefighters indicate that long curving driveways can be an obstacle for fire trucks. The City should review and determine whether Garden Lane should be constructed further to the north to provide access the Saga Hill Park. 3.Grading and Drainage: The proposed grading plan reduces the existing contributing drainage area to the southerly ravine by about 2.5 acres. Storm sewer will redirect this drainage area to the northerly ravine where the gradient is half as steep as the south ravine. This is consistent with our previous comments. The developer ’s drainage calculations appear acceptable. Both ponds reduce the off-site flows compared to predevelopment conditions. Both ponds should have outlet structures constructed to City standards that provide skimming to the 100-year storm event. Storm sewer design and calculations should be provided for review. Final plans should be submitted to the Minnesota DNR and the Minnehaha Creek Watershed District for their review and approval. 4.Easements: Drainage and utility easements should be provided 5-feet wide along all interior lot lines and 10-feet wide along roadway right-of-ways. Drainage easements should be provided 2335 West Hlqhwav 36 • St. Paul, MN 55113 • 651-636-4600 • Fax: 651-636-1311