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B0N5STR00 AND ASSOCIATES ©612 6361311 09/19/96 07:50 g :01/03 NO:084 <br />Bonestroo <br />Rosene <br />Anderlik & <br />Associates <br />Engineers & Architects <br />September 19. 1996 <br />I . •• • I <br />• • I h • . .» t* ••• \ t <br />• •* *i • I > <br />• . M •• ^ , . . , . . I, , . I , <br />*•••»•• I #*,* .t , , 4 , ' . * <br />• *r. *l« 4... , , *,.1 \ M r. , n. i I ^ *,i .1., . » .iH h ►( . <br />’ %•« *rr *' j •, »• - •it,. « • \ • f m %s ;• % !»••« ■.« • j • ir I |/ *•». I*, »«, #*| • <br />• »i » ,tt J f I'’ • • • .1 » . t .•• I ♦ > f .• I V, fc ' I ». • M ..S A wi.,.. • <br />• I <br />^ 4 t '4 • t I I • !••• it« ■ . • • • .4 I t <br />'r r I 4. P't h. i4 w I 4 • • I • Vi- I* *. I • EL <br />' *1 «•• r • <br />V • • » <br />Mr. Michael P. Gaftron, <br />Asm. Building and Zoning Admini.strator <br />City of' Orono <br />Post Office Box 66 <br />Cr\'stal Bay. Minnesota 55?2T <br />Re; Albcc Estate <br />Pile No. 139-gen <br />Dear Mike. <br />We have reviewed the grading plan picparcd by Coffin & Gronberg l\>r the AU kc residence. Tbc <br />propeny is healed on Long Lake Boulevard oserlooking Long L.ike. We have several coinincnts <br />in rcgard.s to cngincci ing nutters. <br />The two 3-fooi tall retaining walls lu-c proposed to control up to 8-feel of fill to be pi .cd on the <br />existing slope. The wall ,a.s shown i;ppears to be acceptable from an engineering standpoint. <br />However, more information musi be provided to identify the specific wall material, type of fill and <br />the whether any type of tie-back rcsitainis will be used If a hltK'k wall is proposed, each block <br />manufacturer has specific design charts that may be used depending tin the type of fill and loading <br />conditions. The iwt» walls musi bo placed at least as fur apart as they are tall (1:1 ) or a surcharge <br />loading must bo used. If a boulder wall is proposed, the si/e of the bouldei*s, w’all batter and <br />embedment dimensitms must be specified. <br />The drainage plan shows directing the storm runoff directly over the two walls. Some type of <br />draintile or storm sewer piping may be needed to prevent problems. Gutters and downspouts should <br />be considered to reduce the amount of runoff at the top of the wall. <br />Please contact me at this office if you have any questions regarding this mailer. <br />Yours ‘ **ry truly. <br />B().Ni:.STROO. ROSENE. ANDERLIK & ASSOCIATES, INC. <br />.b>. <br />Shawn D. Gusiafson. P.E. <br />2335 West Highway 36 • St. Paul. MN 55TI3-3898 • 612-636-4600