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�, i���� °7C".�t+j r� ��"�gR�1�. <br /> � � ' � <br /> . � � y <br /> .? ��,, � � a <br /> , .��-. � ,.� v . <br /> "� <br /> 5201 E.River Road February 29,2008 <br /> Suite 308 <br /> Minneapokis,MN 55421 <br /> Tom Ziegler <br /> rei 763-571-2500 2264 Shad ood Road <br /> F�763-571•I168 5'N' <br /> ,�,��g�� Orono,MN 55391 <br /> Subject: Engineer's Recommendation <br /> Deax Tom, <br /> The purpose of this letter is to offer recommendation for the possible <br /> drainage issues that may occur between your proposed building and the <br /> building at 225b Shadywood Road. <br /> It is my professional opiniort that the draintile shown on a survey dated <br /> january 25,2008 will work with some additional measures. The additional <br /> measures are as follows; <br /> -Add draintile leaders to pick up water from downspouts. This will <br /> prevent the inundation of this area due to rainwater direcfily from roof <br /> drainage. The leaders can be solid 4" draintile. This shaIl be a separate <br /> draintiie system from perforated draintile installed on praperty line. <br /> -Add area drain on ttie south end near the 24"walnut tree. This will <br /> serve two purposes;help prevent surface drainage from"ponding"in <br /> this area and provide an access to the draintile for cIeaning purposes, <br /> should it be needed. <br /> -As discussed on the phone,if the 24" walnut is rernoved,it should be <br /> repiaced with trees or shrubs that have a large evapotranspiration rate. A <br /> local nursery wiil have some suggestions. <br /> -The draintile ruru�iung along the properiy Iine should have the following <br /> properties. The trench should big a m;nim�n of 18"wide(typical b�bcat <br /> bucket width)and 24"deep. The ixench shall have a non-woven <br /> geotextile fabric inshalled. The cLraintile shall be 4"perforated with sock <br /> ta prevent sedimentation. The draintile shall be laid in the bottom of the <br /> txench az�d pea gravel shall fs1l the trench to withixi 4"of the final grade. <br /> The geotextile fabric sha11 covex the top of the pea gravel. 4" of native <br /> topsoil shall be placed over the geotextile fabric. (See schematic drawing) <br /> - Wheze draintile daylights to grade,a guard of soxne sort shall be <br /> installed to prevent"critters"from entering. <br />