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I . <br />Bonestroo <br />Rosene <br />Anderlik & <br />Associates <br />Bonestroo. Rosene. Anderhk and Associates. Inc. is an Afftrrrtauve Action/Equal Opportunity Employer <br />Principals: Otto G. Bonestroo. PE. • Joseph C. AnderUk. P.E. • Marvin L Sor/ala. PE. • <br />Glenn R. Cook. PE. • Robert G. Schunicht. PE. • Jerry A. Bourdon. PE. • <br />Robert W Rosene. PE.. Richard E. Turner. RE and Susan M. Eberiin. C.PA.. Senior Consultants <br />Associate Principals: Howard A. Sanford. PE. • Keith A. Gordon. P.£. • Robert R. Pfefferle, PE. • <br />Richard W. Foster. PE. • David O. Loskota. P£. • Robert C. Russek. A.I.A. • Mark A. Hanson. PE. • <br />Michael T. Rautmann. PE. • Ted K.Fleld. PE. • Kenneth P Anderson. PE. • Mark R. Rolfs. P£. • <br />Sidney P. Williamson PE.. L S. • Robert F. Kotsmith • Agnes M. R:ng • Allan Rick Schmidt. PE. <br />Offices: St Paul. Rochester. Willmar and St Cloud, MN • M.hwaukce. Wl <br />Engineers & Architects <br />August 9,1999 <br />WeOsite: www bonestroo.com <br />Mr. Paul Weinberger <br />Assistant Zoning Administrator <br />City of Orono <br />Post Office Box 66 <br />Crystal Bay, MN 55323 <br />Re:Richie 3-Lot Subdivision <br />BRA File No. 139-2512 <br />Dear Paul: <br />We have reviewed the preliminary plat for the proposed three-lot subdivision for Alan and Marilyn Richie. <br />The site is located on the west side of Hennepin County Road No. 135 (Tonkawa Road) just north of the <br />Partenwood Road intersection in the northwest quarter of Section 8. We have the following comments in <br />regards to engineering matters. <br />1. Access: Proposed access locations for Lots 1 and 2 should be shovra on the plans and submitted to <br />Hennepin County for their review. <br />2. Grading: A grading and erosion control plan for the entire site should be submitted for review. <br />Removing the existing bituminous/concrete walkway to the lake on Lot 3 will create an erosion concern. <br />This area should be restored immediately after the hardcover removal with fiber blanket and bale checks <br />or equivalent. Erosion control measures should be in place prior to any grading or structure removal. <br />3. Drainage: The draft version of the City ’s Comprehensive Storm Water Management Plan (SWMP) shows <br />that the site lies within the Stubbs Bay drainage district. The site drains to the south and the north from <br />the high point on Lot 2. All flows ultimately reach North Arm. The bluff area along the lake and the <br />existing topography of the site will make ponding difficult At a minimum we would recommend creating <br />a vegetated buffer strip along the top of the bluff to provide some water quality benefits. Final plans <br />should be submitted to the Minnehaha Creek Watersh; 1 Distr* ■ f 'r their review. <br />4. Sanitary Sewer: Sanitary sewer to serve Lot 3 the existing home along the south property <br />line. Lots 1 and 2 should be provided sanitary service from Tonkawa Road. The existing sanitary on <br />Tonkawa Road east of Lot 1 should be extended southerly approximately 100 feet to serve Lot 2. It is <br />unclear why there is an existing sanitary sewer easement shown across all of Lot 1 and part of Lot 2. <br />Drainage and utility easements should be provided 5 feet wide along all interior lot lines and 10 feet wide <br />along the roadway right-of -way. <br />5. Financial Guarantee: When the plans have been completed we can prepare an estimate of the totd cost <br />for the site improvements to determine the amount of the financial guarantee required if the City so <br />desires. <br />Please contact me at (651) 604-4863 if you have any questions regarding this matter. <br />Yours very truly, <br />BONESTROO, ROSENE, ANDERLIK & ASSOCIATES, INC. <br />Tom Kellogg <br />Cc: Greg Gappa, City of Orono <br />E