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• � � <br /> 0 � <br /> Memorandum � Bonestroo <br /> 2335 Highway 36 W <br /> St.Paul,MN 55113 <br /> _— <br /> - ---- __ __� —._--- <br /> Project: 141 Chevy Chase r rei 6si-636-a600 <br /> To: Melanie Curtis � Date 5�31�11 Pax651-636-1311 <br /> Drive <br /> _ _ _ __. _ _ _ _- <br /> From: John Smyth Ciient: City of Orono �w���e5troo.com <br /> _ _ __ _ _- ----- — ----- <br /> ---_ ___ ___ <br /> File No.: 139-11000 <br /> Re: Wetland Buffer Variance Review 11-3524 <br /> I have reviewed the Wetland Buffer Variance Application completed by Arrowhead Environmental <br /> Consulting on behalf of the Remarks. <br /> The proposed improvements to mitigate the loss of the buffer include expansion of the buffer <br /> along the east and south half of the lot. The proposed location of the buffer would help <br /> filter/treat the backyard drainage that drains from north to south. South of the house where <br /> expansion of the buffer is not possible they have proposed a rain garden. This wiil help mitigate <br /> the loss of wetiand buffer that would exist at this location and provide treatment of the new <br /> impervious surface being added by the garage. <br /> In order to insure that the improvements wiil function, more detail should be provided for the <br /> native vegetation establishment in the buffer and overall rain garden design. For the wetland <br /> buffer site preparation, seeding approach, as well as seeding and planting locations and species <br /> should be provided. <br /> For the rain garden, in addition to the tile recommended by Darren Amundsen, it is recommended <br /> that a soil correction occur in the location of the rain garden to insure infiltration to the tile. This <br /> requires that 18 - 24 inches of the existing soil be removed and replaced with planting media. <br /> The proposed elevation of the top and bottom of the rain garden should be provided. A typical X- <br /> section of a rain garden is provided below. <br /> `:JiF5 <br /> t.Heavy m�:paent anc traf.<<sna!:De rp,srKted from trave�mg.a�er tfie nfiltraum <br /> menches�mnm¢e mm�acnrg of�e sod. <br /> 2.pam GarEen fia��rot meenn runoff urk.d the mcre Orainage xea r.umib�tmg m the <br /> ran gartlen has bcen scabn�zeE. <br /> 3.Sektt grarwtar ha�cw cmfdms:o MnOOr 5pec37a92.b <br /> 4.N'P.rt:wm[op5ai bOrrtTv Con/pm5 to MnOOT Sptc.3977.2.0 <br /> Tops�d wrt�tuA gras seetl. Muldi([)epth 3'rtwc) 6' <br /> rMVCbt 2�eC mor4:re 270� ' Varrs i Vares ` Thrs rs a EwEk 1hreG0en �F'�"�. <br /> I �--. ._._ .�____ � hxdwma �kn aM 4�a1 i 4rea. <br /> � mee!the er.er�rrm,� <br /> I IJ� C tnn; ' � n,r 2�81.]'v9^' . <br /> Ex_�el � tw .�:kw. � . ..." . <br /> �-��+-_--_,�.__,_ � y`, <br /> t ' e�.e��: � � ' <br /> 1> > <br /> i �� <br /> � / 8grzg�-��-�_-- <br /> AnC11or C�e0t0i[i!2— <br /> fdbrK��VP.) GPDtlrt'.IP � -�_Ldlvlt F�9+(19'S'Wdtk�0'YPth1'hn¢. <br /> F�K,�rt�'� use oMy rwrFmewec stutes m sa'u�� <br /> IB'�bMmg MeEw-_ ._. fi'Ika•n i.��r �9m9.lnstall per anulatturectlrttncn.s <br /> TM1�s metlin ShdU Ce[mar�atd as�dlwvs be5ed m wh�me. <br /> 70�6 Ueart;az�C,kee ot de!etervin matv�al �-n/�ot 712�2n cq_? <br /> 3b94 a4�+r'�I Cu*F�'Mn7�a 18908 CaaCe 2 <br /> srnN�aRo cETA1L5 <br /> X-SECTION THRU RAiN GAROEN <br /> K:\139�139110000\Communicatbns\Wetland Ordinance Compliance\141 Chevy Chase�Me{anie_)5^Mertrorandumdooc [TNS Ofr2010] Page 1 of 1 <br />