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J.fljsonestroo _______ Rosene '71Anderlil<& 1 \j l Associates Bonestroo, Rosene, Anderlik and Associates, Inc. is an Affirmative Action/Equal Opportunity Employer and Employee Owned Principals: Otto G. Bones:,:oo. PE.• Marvin L. Sorvala, PE. • Glenn R. Cook, PE. • Rqbert G. Schunicht, P.E. • ;erry A. Bourdon. P.E. Senior Consultants: Ro~e,: w. Rosene. P.E. • Joseph C. Anderlik. PE. • Richard E. Turner. P.E. • Susan M. Eberlin. C.P.A. Associate Principals: Hc·.•.-2rd A. Sanford, P.E. • Keith A. Gordon. P.E. • Robert R. Pfefferle, P.E. • Richard W. Foster. P£ • 02·.:d O. Loskota. P.E. • Robert C. Russek, A.I.A. • Mark A. Hanson. P.E. • Michael T. Rautman·n. P.E. • Ted K.Field, PE. • Kenneth P. Anderson, P.E. • Mark R. Rolfs, PE. • F --- Engineers & Architects David A. Bonestroo. M.8.A • Sidney P. Williamson. P.E., L.S. • Agnes M. Ring. M.8.A. • Allan Rick Schmidt, P.E. August 14, 2000 Mr. Paul Weinberger Zoning Administrator/Planner City of Orono Post Office Box 66 Crystal Bay, MN 55323 Re: Van Eeckhout Subdivision File No. 139-2550 Dear Paul: Offices: St. Paul. St. Cloc;c. Rochester and Willmar. MN • Milwaukee, WI Website; www.oonestroo.:::::om We have reviewed the revised preliminary plat for the proposed seven lot Van Eeckhout subdivision. The site is located east of South Brown Road, south of Long Lake and north of the Luce Line trail in the northeast quarter of Section 3. We have the following comments in regards to engineering matters. 1. Access/Streets: The proposed access to the site is via Apple Glen Road in the City of Long Lake. Apple Glen Road is accessed off of Watertown Road. The total length of the cul-de-sac from Watertown Road is approximately 1600 feet where City code allows a ma-timum cul-de-sac length of 1000 feet. Plans should be submitted to the City of Long Lake for their review and comment. The proposed typical street section shows 24 feet of paved width with no shoulders. We recommend that the street section be revised to include 3-foot gravel shoulders as required by City standards. The street section should provide for a minimum of 8-inches of Class 5 aggregate base and geotextile stabilization fabric if necessary. We recommend 1 ½ inches of Type 41 bituminous wear course and 2 inches of Type 31 bituminous base course. A geotechnical evaluation and R- value recommendation should be provided to verify the street design. 2. Grading: The grading and erosion control plan should include erosion control measures to protect the existing wetland. The erosion control plan may need to incorporate bale checks and fiber blanket in the ditches and along steeper slopes. A \Vetland mitigation plan should be implemented for any wetland filling. Erosion control measures should be in place prior to any grading, particularly along the wetland. Additional erosion control will be needed during construction of the houses. 3. Drainage: The draft version of the City's' Comprehensive Storm Water Management Plan (SWMP) shows that the site lies within the Tanager Lake drainage district. Long Lake Creek, a Mn DNR protected waterway, flows through the site. Plans should be submitted to the Mn DNR and the Minnehaha Creek Watershed District (MCWD) for review and approval. Proposed ponds should meet NURP standards. All proposed ponds should specify normal water level (NWL) and high water levels (HWL). The final plaris should include final pond grading including a 10: 1 aquatic bench 10-feet wide at the pond NWL. The pond design should also include an outlet structure that provides I-foot of skimming to remove floatables and debris. Skimming should be provided to the pond HWL. Storm sewer design including outlet structure details should be provided for review. Best Management Practices (BMP's) should be implemented on all areas where storm water cannot be routed directly to a pond. A drainage area map, storm sewer and ponding calculations should be provided with the final plan set. 4. Sanitary Sewer: The City of Long Lake should be consulted regarding proposed connections to their sanitary sewer system. A written sewer agreement between the Cities of Long Lake and Orono will be required. The developer should provide detailed sanitary sewer design including plan and profile sheets. The City of Orono should review the sanitary sewer needs along South Brown Road (existing home west of Lot 1, Block 2) and determine whether the sewer should be extended to the westerly boundary of Outlot A. 5. Easements: Drainage and utility easements should be provided 5 feet wide along all interior lot lines and 10 feet wide along the roadway right-of -ways. Drainage easements should be provided across all wetland, drainage way and pond areas. 2335 West Highway 36 • St. Paul, MN 55113 • 651-636-4600 • Fax: 651-636-1311