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. �x��r�" � <br /> � Concept Landscaping <br /> 3153 Priest Lane <br /> Mound, MN 55364 952-472-4118 / FAX 952-472-4119 <br /> �°�'�°�'���,�; <br /> ��� � � 5 <br /> City of Orono z0� <br /> CiyO KB1�yPaMN 55323 �I��UF��QnIC� <br /> 6/13/2005 <br /> Subject: Newlcirk, 1489 Shorel'uie Drive, Orono, MN 55391 <br /> Repair wash-out <br /> Engineer renlarks response , <br /> Please find a copy of our revised section wluch adds inore detail. Tlus is a very suiiple <br /> little washout that could be handled by any homeowiier or landscaper that has ever built a <br /> retaiiung wall before.Newkirk's landscaper has already diverted �Il of the above runoff <br /> away from this subject location, so there is no upper water runoff pressure being exerted. <br /> Furfllermore, please find a copy of a permit you issued in 2002 for Cluis Engeler,permit <br /> P05589, for a washout that was four tiines larger and much worse. You will find that we <br /> used the same eaact tried and true process for repair. You will also notice that you easily <br /> approved th�t perniit. We have been using tlus exact repair process for 30 years and have <br /> never had a problem,this is not a concephial plan. <br /> Reillarlcs response: <br /> 1. I liave added design information to the section. I have also enclosed Chris <br /> Eiiglerer's section wluclZ was previously approved. <br /> 2. I have revised iny section to Ue all .60 CCA treated timbers. A standard timber is <br /> .40 CCA. A .60 CCA treated timber will last for years, however they only need to last six <br /> years,which is why we use clay fill. Clay which is our natural soil around Lake <br /> Miiuietonka settles and compacts over tlie six ye�u period. Our plaiitings root up lncl the <br /> hillside beco�.nes natzirally stable �gain. At that point in time the sub terrainiaii w111s 1re <br /> iio longer necessacy. <br /> 3. Our plan is in operltioii all over Lake Minnetoilka with miny years of perfect <br /> results. Histoiy has proven our sub terainian walis aud erosion control methods work <br /> great. Obviously, eaposed retaining walls are the best w1y to haudle a sihiation like this, <br /> however, retaining walls do not ofFer tlie capaUility of maintaining the iiaiural beauty of <br /> �n undisturbed hillside which is the desire here. <br /> a. The entire hillside is clay (natural Clay). It has beeu veiy stable for ye�rs with no <br /> problems. A contr�ctor removed a large tree at that location at the top of the hill causing <br /> t(ie hillside instability and slide. Graiiular fill will never compact and hold oii the hill Uy <br /> itself. Therefore to use granular fill means we would have to hold the fill with retaiivn� <br />