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<br /> PROJECT': Fritz Adclition � x�F,��� ; F ,��,� ,
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<br /> 3 848 North Shore Drive � � � ���"�`�,"� t y,�°���`�'��„
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<br /> TO: Tom Kellogg ww�v.loucksmclagan coma'���" �`� °��'` ` � �"
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<br /> FROM: Nicholas Mannel , <: , Fr �� � , , R`
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<br /> DATE: January 11,2006 '� "�
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<br /> SUBJECT: Site Plan Review Comments and Storm water Management 1'lan ' r ' � : '
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<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 and screening, driveway grade modification, and sanitary sewer modification. The '°'' '`
<br /> storm water management proposal addresses the need for stonn water rate and quality control.
<br /> The existing 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 storm water runoff from the added impervious 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 HydroCAD calculations. The existing runoff for the 100-year storm ,
<br /> is 5.56 cfs.
<br /> Summaries of our findings are:
<br /> • The 100-year storni existing runoff is 5.77 cfs. '
<br /> • The 100-year storm proposed runoff is 4.52 cfs.
<br /> • The East Rain Garden 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 all treated water.
<br /> • The South Rain Garden will be 1200 cf and wili infiltrate all treated water.
<br /> All 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 ASSOCIA.TES
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<br /> Nicholas Mannel :>���-"���`�'' �-
<br /> cc: Janice Gundlach, City of Orono "�}"`�'
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