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,:;,: , _,: !_� �P I <br /> ,�,,, _��,; .�.�. <br /> MEMORANDUM �.i„���: �i„�i:,,. ��.��� <br /> - ,-,,,., <br /> PROJECT: Fritz Addition , i , , }Planning <br /> 3848 North Shore Drive civil Engineering <br /> Loucks Project No. OS-018 " '��' '� ''�" <br /> Plat No. OS-3]6l Land 5urveying <br /> ..�.,,�, i.��..i:,��� !,�, ,,,.,,,��: <br /> Landscape Architecture <br /> TO: Tom Kellogg ,. .,� .,__ ,.��,.. � � <br /> Environmental <br /> FROM: Nicholas Mannel <br /> DATE: Decembec 22, 2005 - - <br /> SUBJECT: Site Plan Review Comments and Storm water Management Plan <br /> We have responded to your site plan review comments and included updated plans and a storm water <br /> management proposal. The revisions include changes to the retaining wall to accommodate the <br /> required setback, driveway gi•ades modification, and sanitacy sewer modification. The stonn.�vater <br /> management proposal addresses the need for storm water cate and c�uality control. <br /> The e.cisting site is wooded and contains wetlands in the western portion. There are currently three <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 storin water runoff from the added impervious area will <br /> be treated and stored in vegetated swales and rain gardens. <br /> The pcoposed storm water release offsite from this system is controlled to be less than the e;cisting <br /> condition. The i-unoff quantities for the existing atld proposed conditions for the 2, 10, and 100-year <br /> storm are shown in the attached HydroCAD calculations, The eYisting runoff for the 100-year storni <br /> is 5.56 cfs. <br /> Swl�maries of our findings are: <br /> • 'T'he ]00-year storm existing runoff is 5.56 cfs. <br /> • The 100-year storm proposed runoff is 5.07 cfs. <br /> • The East Rain Garden will be 1400 cf and have a 12" culvert with a 10" orifice plate to <br /> control the rate of storm water release from the site. <br /> • Tlie NW Rain Gardeit wil( be 500 cf and l�ave a 12" culvert with ail 8" orifice plate to control <br /> the rate of stocm water release from the site. <br /> • The Central Rain Garden will be 550 cf and will infiltrate all treated water. <br /> • The South Rain Garden will be 1200 cf and will infiltrate all treated water. � <br /> Alf storm water calculations and drainage maps are included in this submittal. If you have questions <br /> about any of these calculations or anything e(se p(ease contact Mike St. Mai-tin or me. <br /> Sincerely, <br /> L UC S ASSOCIA �S <br /> r � , ' <br /> N cholas Mannel �5�����I <br /> cc: .Tanice Gundlach, City of Orono <br />