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_ ' . ��7�}1@�I-Iemlock Lane t� t'� �
<br /> � Suite 300
<br /> �i
<br /> MEMORA.NDUM • Minneapolis,MN
<br /> ' S5369
<br /> PROJECT': Fritz Addition Tel 7G3.424.ssas
<br /> 3 848 North Shore Drive � ' • .
<br /> Loucks ProjectNo. OS-018 F�.r 7G3.424.5822
<br /> Plat No. OS-3161 , hameC�loucl:smdagan.com . •�
<br /> ' ' y`
<br /> �'�: Tom Kellogg wvnv.loucksmcl3gan.com ' , ,�'�. '._,�
<br /> . . .�i.r jJ p �.L�L�. c�� M
<br /> FROM: Nicholas Mannel . � � �a�� ��' °x��.::���
<br /> r� • �-^a'� ,1��;���x`�
<br /> • • �h�'j�: ��'+,�' 'Y,,���A¢Y����iy�
<br /> DATE: January 11 2006 '�` s��
<br /> � �;:�-.�, �ft.� n;s�� ��.:�
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<br /> SUBJECT: Site Plan Revie Comments and Sto m Plan '����•�'�J��, ��`;, �f��
<br /> w rm water Manage ent _ �����?�',�`�T��� �,�F`a,"� �
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<br /> [},.,��:yu 4�;a�'�!., N�'Y' h'[rh%�i{�y;a,'��
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<br /> We have responded to your site plan review comments and included updated pla a d a to 's',�'"", .,;t����^ ",'�:"�
<br /> ns n s rm water �x1��;��' �,�'���.�"�',� :
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<br /> management proposal. The revisions include changes to the retaining wall to accommodate the ::,.;:;��;,�:4��,p�tiS�y'`;te'`1��;;;:,µ4'�
<br /> required setback and screening, driveway grade modificatzon, and sanitary sewer modification. The ,, � ,ry;;ry.i�,.�.r:
<br /> ;<�{;,r�.rr�:.,r::�:�t�.�<::�:
<br /> storm water management proposal addresses the need for stonn water rate and quality control. ':R�.:::�;�y;:;:-r<ir�f:�:�";,:;c:f;;�;��
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<br /> .The existing site is wooded and contains wetlands in the western portion. There are currently three :`�`�'`��`�''�"'":_"°`��`�'"";�c°.'���
<br /> homes on the site. Two of these homes will remain and one will be demolished. There are three new • ,..� - �
<br /> homes proposed to be built. The additional storm water runoff from the added izn.pervious area will � � .� . . .. � � . �.
<br /> � be treated and stored in vegetated swales and rain gardens. ' � � ' . .'. '
<br /> The proposed storm water release offsite from this system is controlled to be less than the existing . �
<br /> condition. The runoff quantities for the existing and proposed conditions for the 2, 10, and 100-year ,
<br /> storm are shown in the attached HydroC.A.D calculations. The existing runoff for the 100-year storm � ' ,
<br /> is 5.56 cfs.
<br /> Summaries of our fmdings are: '
<br /> � The 100-year storm existing runoff is 5.77 cfs. � •
<br /> • The 100-year storm proposed runoff is 4.52 cfs.
<br /> • The East Rain Gazden will�be 1400 cf and have rip rap weir outlet to control the rate of storm
<br /> water release from the site.
<br /> • The NW Rain Garden will be 500 cf and have an 8"culvert to control the rate of storm water
<br /> release from the site.
<br /> � The Central Rain Garden will be 550 cf and will infiltrate aIl treated water.
<br /> • The South Rain Garden will be 1200 cf and will infiltrate aII treated water.
<br /> AlI storm water calculations and drainage maps are included in this submittal. If you have questions
<br /> about any of these calculations or anything else please contact Mike St.Martin or me. �
<br /> Sincerely, � . .
<br /> L UCKS ASSOCIATES
<br /> . . �` /
<br /> ' ,
<br /> Nicholas Mannel
<br /> cc: Janice Gundlach,City of Orono . . •�"�"s:
<br /> ,\•I inncapolix.
<br /> . 5t.Paul
<br />
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