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' ► <br /> Memorandum �Bonestroo <br /> . 2335 Highway 36 W <br /> St.Paul,MN 55113 <br /> Project: 141 Chevy Chase Te1651-636-4600 <br /> To: Melanie Curtis Drive Date: 8/31/11 Fax651-636-1311 <br /> From: John Smyth Client: Clty Of OI'Of10 www.bonestroo.com <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 fhe 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 will help mitigate <br /> the loss of wetland 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 will function, more detail should be p�ovided 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 ptanting 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 /> NOTES: <br /> l.Meavy equipnmt end veHk shall be re4riaed hom travePog wer tlie infihatim <br /> venUxs ro mhhn¢e compacting of the w4 <br /> 2.Rsn Garden�an rot receruc rurotl uNtl the mtre a�art�age mea cartri6utkg m the <br /> ran gartlen has been mtidizeA. <br /> 3.Seka granular bortow conlmms ro MnDOT Spec31a92b <br /> 4.Remfum tq�soil horraw con(orm9 m MnDOT Spec.387J.2.0 <br /> Topsotl wrth Nrt gras seN. � Mukh(Depth 3"max.) 6` <br /> Mn/Oot med mature 270 VNIlS VMkS 7MS a a Ooubk ahreiAcE Flat <br /> hardwootl mukh ard�al Area <br /> �100%Com�nrt me![the requaener¢5 W <br /> Fd�er Bl�ket Mn/Oot 3882.2 TYCO 6 <br /> Ex.�+raye <br /> '..._ .._.,.- 4:1 4:1 .... <br /> Ekv� . ' <br /> ... _.. _. .:.._.... <br /> 2,q� � ' :•::•:,--. .:. .a:.._ .��. ':....:::. .:..�,',: '..'-' <br /> ::�.> ..•:.. ,...,,-. . .. <br /> Nx1ia GcataRile ::. 1, Bouom Elev. <br /> Nx1 a <br /> �abric(M�, Geotextik 1 � - ��awn Edqi�p.5•aack P�,�. <br /> Fabric,Type 1 Use aNy noirmelaAic zixk�s m sewre <br /> 18'vlaraqig hkyy 6'D'uin Tlle �d9m9.lnuall per manulaQUres dveawns � <br /> Thts metlw shall be cros�uard as fdlows basetl m vdume: <br /> IOSb ckan vntl,frea d dtltterciu mattskl•MNDat 31)7.7B fAa � <br /> 30%ag�k leaf mmpost•Mn10a 38908 Gade 2 <br /> STANDARD DETAILS <br /> X—SECTION THRU RAIN GARDEN <br /> K:\139�139110000\Communications\WeUand Ordinance Compllance\lql Chevy Chase\Melanie_]S^Memorandum.doa (TNS 06-2010] Page 1 of 1 <br />