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^ m Bonestroo <br />Rosene <br />Anderlik & <br />|\J| Associates <br />Engineers & Architects <br />January 12. 1998 <br />Mr. Michael P. Gaffron <br />Senior Planning Coordinator <br />City of Orono <br />Post Office Box 66 <br />Crystal Bay. MN 55323 <br />Re: Andersen Subdivision <br />File No. 139-2321 <br />Boneitroo. Roi^ne. Andcrhk ^nd Asjoc/.if^s. Inc is an Affirmative Action Equal Opportunity Employer <br />Principals Quo G Bonestroo. PE • Joseph C Anderlik. PC • M<irvin L Sorvdij. PE • <br />Richard E. Turner. PE • Glenn R Cook. PE • Robert G Schumcht. PE • Jerry A. Bourdon. PE • <br />Robert W Rosene. PE and Susan M Eberlin. C PA . Senior Consultants <br />Associate Principals Howard A Sanford. FC • Keith A Gordon. PE • Robert R Pfeffcrie. PE • <br />Richard W Poster. p£ • David O Loskota. PE • Robert C Russek. A l A • M.vn A Hanson. PE • <br />Michael T. Rauimann. PE • Ted K Fieid. PE • Kenneth P Anderson. PE • Mark R Rolfs. PE. • <br />Sidney P Williamson. P.E.. L S • Robert F Kotsmith <br />Offices St Paul. Rochester Wiiimar and St Cloud. MN • Milwaukee. Wi <br />3 <br />t-i'i-p <br />Dear Mike: <br />Wc have reviewed the sketch plan for the proposed eight lot Andersen subdivision. The site is located west of Old <br />Crystal Bay Road South (C.R. o4) in the northwest quarter of Section 9. Wc have the following comments in regards <br />to engineering matters. <br />1. Access: Access to Lot 8 is unclear. We would recommend moving Outlot B approximately 150 feet southeast to <br />provide access to Lot 8 and eliminate private driveways onto C.R. 84. How will future access be provided to the <br />Lots immediately west of the site? Will the existing buildings on Lots 1. 2. 4 and 5 remain or be removed? The <br />existing grades on Outlot A exceed 10 percent. City code allows up to a 12 percent grade on private streets, <br />however, we would recommend that grades not exceed 2 percent for the first 50 feel off of C.R. 84. It does not <br />appear that adequate sight distances exist for cither cul-de-sac. Plans should be submitted to Hennepin County for <br />their review. <br />2. Grading: A grading and erosion control plan for the entire site should be submitted for review. Erosion control <br />measures should be in place prior to any grading, particularly along the lakcshore. Additional erosion control will <br />be needed during construction of the houses and septic systems. <br />3. Drainage: The draft version of the City ’s’ Comprehensive Storm Water Management Plan (SWMP) shows that the <br />site lies within two major drainage districts, half draining easterly and half draining southwesterly. Wc recommend <br />that storm sewer be included as part the project to direct flows in accordance with the SWMP. The final plans <br />should include a storm water quality pond to treat runoff prior to discharging into the lake. A drainage area map. <br />storm sewer and ponding calculations should be provided with the final plan set. <br />4. Easements: Final platting should include 33 feet of dedicated right-of-way for C.R. 84. Drainage and utility <br />easements should be provided 5 feet wide along all interior lot lines and 10 feet wide along the roadway right-of - <br />ways. Drainage easements should be provided across all wetland, drainage way and pond areas. <br />5. Financial Guarantee: When the plans have been completed wc will prepare an estimate of the total cost for the site <br />improvements to determine the amount of the financial guarantee required. <br />Please contact me at (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 />2335 West Highway 36 ■ St. Paul, MN 55113 • 612-636-4600 ■ Fax: 612-636-1311