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Bonestroo <br />Rosene <br />Anderlik & <br />Associates <br />Engineers & Architects <br />March 19, 1998 <br />Mr Michael P. Gaffron <br />Senior Planning Coordinator <br />City otOrono <br />Post Office Box 66 <br />Crystal Bay. MN 55323 <br />Re: Waade Subdivision <br />File No. 139-2340 <br />Ponesirco. Roiene Anderlik Aisoci^tes. Inc ti .in Affirir.inve Action Equ.^l Opportunity Employer <br />PrincpMs Otto G BoncsTroo • Joseph C AncJerl k. PE • L Sorv^la. PE • <br />Rich.<rd E Turrer PJ • Glenn R Cook. PE • Robert G Schunicht. PE • Jerry A Bourdon PE • <br />Robert W Rosene. PE and Susan M Eberlin. CPA. Senior Consultant' <br />Astoctate Principals Howard A Sanford. PE • Keith A Gordon. PE • Robert R Pfeffcrie, PE • <br />Richard W Foster. PE • David O Loskota. PE • Robert C Russek A I A • Mark A. Hanson, PE. • <br />Michael T Rauimann. PE • Fed K Field. PE • Kenneth P AncJerson. P£ • Mark R Rolfs. PE • <br />Sidney P sViiiiamson. P£ . L.S • Robert F Kotsmith <br />Offices St “aul. Rochester Willmar and S: Cloud MN • Mil .vaukee. Wl <br />0 • * <br />9 0 <br />w*4l <br />We have reviewed the preliminary grading plan and revised plat for the proposed two lot Waade subdivision. The site <br />is located at 3280 and 3290 Northshore Drive (C.R. 51) east of Tonkawa Road (C.R. 135) in the southeast quarter of <br />Section 8. We have the following comments in regards to engineering matters. <br />1. Access: The width of Outlet A is shown at 40 feet where City code requires a minimum width of 50 feet. The <br />driveway shown north of Oiitlot B should be paved to a minimum of ' 2 feet in width; the driveway is currently shown <br />at 10 feet in width. Hie pavement south of the proposed house should be enlarged to allow for turning movements. The <br />fi;e department should review the plans and provide conunents. <br />2. Utilities: Please see our January 30, 1998 comments as they still apply. <br />3. Gr&.!ing: The proposed grading and erosion control plan shows a ponding area located south of the proposed <br />ivvinliome. 1 ho gt.tJinj phui also shows an emergency overflow elevation of 933.20. If the pond outlet becomes plugged <br />and tlii water rises to this overflow elevation, the existing homes east of the site will experience some flooding. We <br />rccotnmcnd revising the grading plan so that in the event of a plugged pond outlet the water will be directed away from <br />homes and tow ard the lake. The proposed grading in the southeast corner of the site is within 3 feet of an existing home <br />with slopes exceeding 3:1. We recommend that the grading plan be revised so that slopes do not exceed 3:1 and grading <br />is minimized near any existing structures. <br />4. Drainage: We recommend that storm sewer be no smaller than 12-inchcs in diameter. A drainage area map, stoim <br />.sewer and ponding calculations showing pre and post development conditions should be submitted for review. <br />а. !i '.ppca:s :!.? prcpcsed utility easement shown along ihe west lot line does not cover the existing <br />sanitary sewer. An easement 20 feet wide centered on the existing sewer should be shown on the plat. <br />б. Financial Guarantee: W!;cn the plans have been completed we 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 />/oyy} <br />l oir .<oilog" <br />Cc; Greg Gappa, City of Orcr.o <br />2335 West Highway 36 ■ St. Paul, MN 55113 ■ 612-636*4600 ■ Fax; 612-636-1311