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ir <br />si- <br />if--. <br />H' <br />r <br />r: <br />M <br />I'- <br />n- <br />f-il.i t*; • <br />^:,f <br />^:4 <br />fS" >g- <br />6p:’i Ika;''. <br />:(ii- <br />I' <br />C& <br />1 - <br />fVNmu <br />--is ■■ <br />'■V-. <br />'j/jfcT*'^' V*'■ ^ >. <br />f:vmfc' <br />; f •m' - <br />'.r <br />*■ <br />tl>%rtil,'- <br />\W- <br />P-- <br />Bonestroo <br />Rosene <br />Anderlik & <br />Associates <br />Ore* G <br />X' 9oyfr>e ’ <br />:ci^T^ C ^ <br />a P- <br />®c’^4ftr t <br />Q.e''r> ft Cy* <br />T^crrKdS £ Nevr^^ <br />Pcc«<^ G Sc’^ur<»^ ?£ <br />M •<' C ^ <br />•Sr^or Ciy'^-'^>'*T <br />Engineers & Architects <br />: A wr*c-.* ‘"£ <br />Gc 'Oor <br />Scoe ’'; ® c>s.*y. ^ r 5 <br />A *^v:i^ **£ <br />r*-.^ O Loviic<a PE <br />C Puvie^ ^ <br />A P£ <br />T lt»i>rr'.arri *'£ <br />it p-fHd Pf <br />s Anoenor* ^ <br />CVrr\^<? C Burgjrrai Pf <br />T'-’or\i^ £ A'xjuV P£ <br />Gj ''» * P»'ji'x^e* PE <br />V'Ar* PE <br />\*tr^ p ?E <br />Av.-e*. *** ^ ^ * C P <br />'•‘cr^jv A *V?e X' P£ <br />• r-s. :.' <br />9 V^ anc Pf <br />>r"V C5 PE <br />P A'XJe'VV' Pt <br />» 9c«\ P£ <br />Mart * >o PE <br />Gary \A P£ <br />Dar’iei > Ec^pnon PE <br />P*' C . C3IA^‘ P? <br />Ma t D Aa-s.P£ <br />S' ^ 3 .e^s^ P£ <br />i p* c G t P£ <br />KJT'^ - 'A<pr>:^ PS <br />«• 'CCC PE <br /><a-r^ J >apa PE <br />S'-a.v- D G<.ua^w^ p£ <br />C ‘C 0!r^'i^r P E <br />CPanr^ A erctson <br />l *0 Kt Paw^yry <br />Hanan m Ovon <br />ja*-nrs p E^vjpp'affX <br />June 5, 1992 <br />Ms. Jeanne A. Mabusth <br />Building and Zoning Administrator <br />City of Orono <br />Box 66 <br />Crystal Bay, MN 55323 <br />Re: A. James Neison <br />Conditional Use Permit Appl. #1739 <br />Our File No. 139-1739 <br />Dear Jeanne: <br />We have: reviewed the application and topogiaphic detail plan submitted ''or a conditional use <br />permit on the A. James Nelson property in Lot 7, Block 1, Stielows Addit.on. There are several <br />significant engineering issues related to the constructability of the imp.ovements. <br />The existing timber retaining wall should be removed and disposed of at an 'droved disposal <br />site. The proposed 2.5 to 1 (horizontal to vertical) slopes are constr jctable, out will be very <br />difficult to maintain or mow. The slope should bt wStored with vegetation or other ground <br />cover hat will minimize erosion and will require little maintenance. The proposed 3 to 4 foot <br />tall wall is necessary to protect several of the large trees in the area. The **"' •1 is proposed to <br />be constructed with the same 2.5 to 1 slopes above it, while i.tilizing the existing clayey and <br />loamy soils in the area. We recommend that the proposed wall be engineered so that the <br />stability and drainage concerns are addressed. At the very minimum, granular material and <br />drain tile should be instaUed behind the waU to minimize the hydrostatic pressure at the base <br />of the wall. The slopes should be graded to aiir^v- a small drainage swale running along the top <br />of the wall. The swale would divert the surface runoff to the sides and minimize the amounts <br />of runoff flowing over the wall. We recommend the wall be constructed with a modular block <br />system such as Keystone. <br />Please contact me at this office if you have any questions. <br />Yours ve truly, <br />BONESTROO, ROSENE, ANDERLIK & ASSOCIATES, INC. <br />IyfkU*^ vl <br />Shawn D. Gustafson, P.E. <br />SDG:U <br />2335 West Highway 36 • St. Paul, Minnesota 55113 • 612-636-4600 <br />r