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r <br />1/ I Bonestroo <br />Rosene <br />^5 Anderlik & <br />Associates <br />Engineers & Architects <br />March 19. 1998 <br />Mr Michael P. Gaft'ron <br />Senior Planning Coordinator <br />City of Orono <br />Post Office Box 66 <br />Crystal Bay, MN 55323 <br />Re: Waadc Subdivision <br />File No. 139-2340 <br />Ponvitroo Roscnf. Anderhk As$OCf»ites tnc IS • \ffirmMivc Actton, £qud! Opportunity Emo^c. cr <br />Principals Olto G Bonestroo. PE • Joseph C Ande»^fik. PE • Vp'vm L Sorv^Ki. PE • <br />Rich.<rd E Turner. PJ • Gicnn R. Cook. PC • Robert G Schunicht PE • Jerry A Bourdon. PE • <br />Robert W Rosene. PE and Susan M Eherim. C PA . Senior Consultants <br />Associate Principals Hov/ard A Sanford PE • Keith A Gordon, PE • Robert R. Pfcfferl*'. PE • <br />Richard W Foster. PE • David O Loskota. PE • Robert C RusseK. A I A • Mark A Hansen. PE. • <br />Michae* T Rautmann. PE • Ted K Field. PE • Kenneth P Anderson. PE • Mark R Rolfs. P£ • <br />Sidney P Wiii.amson. PE. L S • Robert F Kotsmitn <br />Offices St ®aul. Rochester. Wiiimar ,»nd S* Cloud MN • Milwaukee. M l <br />r.tNO 9 0 <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 Outlot A is shown at 40 feet where City code requires a minimum width of 50 feet. The <br />driveway shown north of Outlot B should be paved to a minimum of 12 feet in width; the driveway is currently shown <br />at 10 feet in v/idili. 'Hie pa\ ement south of the proposed house should be enlarged to allow for turning movements. Tlie <br />fi;e department should review the plans and provide comments. <br />2. Utilities: Please see our J:inuary 30,1998 comments as they still apply. <br />3. GraJiiig: The proposed grading and erosion control plan shows a ponding area located south of the proposed <br />fwinliome. 1 he gi.iJing pl.in also shows an emergency overflow elevation of 933.20. If the pond outlet becomes plugged <br />and the water rises to this overtlow elevation, the existing homes east of the site will experience some flooding. We <br />recommend revising the giading plan so that in the event of a plugged pond outlet the water will be directed away from <br />homes and toward the lake. The proposed grading in the southeast comer of the site is within 3 feel of an existing home <br />witli slopes exceeding 3:1 . We recommend that the grading plan be revised so that slopes do nvl exceed 3:1 and jading <br />is minimized near any existing structures. <br />4. Dramage: Wc recommend that storm sewer be no smaller than 12-inches in diameter. A drainage area map, storm <br />sewer and ponding calculations showing pre and post development conditions should be submitted for review. <br />5. Ca'.-.ucib. !. .vpca-.a:!.? prc;?o:,ed utility easement shown along the west lot line docs not cover the existing <br />sanitary sewer. An easement 20 feet wide centered on the existing sewer should be shown on the plat. <br />6- Financial Guarantee: Wlicn the plans have been completed we will prepare an estimate of the total cost for the site <br />improvements to detcrinme 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 />/O-T^ <br />loir .•'.eilogg <br />Cc: Greg Gappa, City uf Orono <br />2335 West Highway 36 ■ St. Paul, MN 55113 • 612-636-4600 - Fax: 612-636-1311