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Bonestroo. Roiene. Anderhk ^nd Associates, inc is sn Affirmative Action. Equ^i Opportunity Employer <br />Principals Otto G Bonestroo. PE • Joseph C Anderhk. PE • Marvin L Sorv.iM. PE • <br />Richard E Turner. PE • Glenn R Cook, PE • Robert G Schunicht, PE • Jerry A Bourdon, PE • <br />Robert W Rosene. PE and Susan M Eberlin. C PA . Senior Consultants <br />Associate Principsts Howard A Sanford. PE • Keith A Gordon, PE • Robert R Pfefferle. PE. • <br />Richard W Foster. PE • David O Loskota PE • Robert C Russek. A l A • Mark A Hanson. PE. • <br />Michael T Rauimann. PE • Ted K.Field. PE • Kenneth P Anderson. PE • Mark R Rolfs, PE • <br />Sidney P Williamson. PE. R S • Robert F Kotsmith <br />Offices St Paul. Rochester. Wilimar and St Cloud. MN • Milwaukee. Wl <br />1/1 Bonestroo <br />Mm Rosene <br />Anderlik & <br />Associates <br />Engineers & Architects <br />July 16, 1997 <br />Mr, Michael P. Gaffron <br />Asst. Planning and Zoning Administrator <br />City of Orono <br />Post Office Box 66 <br />Crystal Bay, Minnesota 55323 <br />Re: Brook Park Realty <br />File No. 139-2263 <br />Dear Mike, <br />We have reviewed the concept site plan for the proposed planned residential development consisting of a <br />total of 45 townhomes. The site is located on Lots 2 and 3, Block 9, Townsite of Langdon, along the <br />north side of CSAH 15. We *»ave the following comments in regards to engineering matters. <br />1. Access: The extension of Livingston Avenue appears to meet City standards for a public or private <br />roadway. The proposed intersection at CSAH 15 is approximately 220 feet east of a vertical crest. This <br />may not be an acceptable location for the intersection. Hennepin County should review the sketch plan <br />and the proposed street access. <br />2. Drainage: An area of approximately 30 acres, including this site, drains to the wetland on the <br />property. The wetland drains southerly, eventually reaching Carman Bay. The City’s Wetlrjid Inventory <br />Map identifies this wetland as a protected Type 3 wetland with an area of 3.4 acres. The wetland area is <br />shown as one continuous area. The alignment of Livingston Avenue crosses through this area, a formal <br />wetland delineation should be conducted on the property to determine the extent of the wetlands. <br />Stormwater ponding will likely be needed to treat runoff from the development prior to reaching the <br />wetland. <br />3. Utilities: The existing 6-inch water main at the west end of Livingston Avenue should be extended <br />through the development and looped to the existing 6-inch stub near the location of the proposed <br />intersection. Sanitary sewer service to the property can be separated into three areas. (1) The area east of <br />the wetland and north of Livingston Avenue can be served by MH-519 with an invert of 944.81. (2) The <br />area east of the wetland and south of Livingston Avenue can be served by MH-520 with an invert of <br />933.02. (3) The area west of the wetland can be served by the sewer in CSAH 15. <br />4. Easements: An additional 7 feet of right-of-way should be provided along CSAH 15. <br />Please contact me at this office if you have any questions regarding this matter. <br />Yours very truly, <br />BONESTROO, ROSENE, ANDERLIK, & ASSOCIATES, INC. <br />Shawn D. Gustafson, P.E. / <br />Cc: Mr. Greg Gappa, City of Orono <br />2335 West Highway 36 ■ St. Paul, MN 55113 • 612-636-4600 - Fax: 612-636-1311