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�� �� <br /> '�I Bonestroo <br /> /�/1e f17 O .�Rosene <br /> �Anderlik& <br /> Associates <br /> Englnccr�6 Archi[ects <br /> Project Name: 3848 North Shore Drive, Fritz Client: City of Orono <br /> Addition <br /> File No: 139-05-000 <br /> To: Tom Kellogg <br /> Date: 1-18-06 <br /> From: Lance Hoff, Dan Murphy <br /> Re: 2�d Drainage Review <br /> Comments/Recommendations <br /> Based on our review of the 3848 North Shore Drive development, we offer the following <br /> comments. <br /> 1. The overall site was found to meet City of Orono stormwater rate control and water qualify <br /> treatment requirements. <br /> 2. The proposed site contained sufficient rate control to meet existing conditions: The table <br /> below summarizes the 2-, 10-, and 100-yr peak flow rates for existing and proposed <br /> conditions. <br /> 2-yr 10-yr 100-yr <br /> cfs cfs cfs <br /> Existing 0.4 2.6 6.7 <br /> Proposed 0.4 2.0 5.5 <br /> 3. Ty� rain ga�dzn located �� the northwest cor�e� of the site �rovides minimal detention and <br /> infiltration. This rain garden acts essentially as a culvert crossing under the proposed <br /> driveway. However, this is compensated for by the three remaining rain gardens. The <br /> remaining rain gardens provide sufficient treatment for the entire site. <br /> 4. The proposed grading near the aforementioned northwest culvert crossing is unclear (944 <br /> contour shown inaccurately). However, sufficient storage is provided near the culvert <br /> entrance to avoid driveway overtopping during the 100-yr event. The peak elevation <br /> modeled at the culvert entrance was 939.9 for the 10Q-yr event. The driveway crown is one <br /> foot above this elevation at 940.9. <br /> 8onestroo, Rosene,Anderlik and Associates, Inc. www.bonesfroo.com <br /> SI.Paul Ofllce. Milwaukee ONice: Rochesler OHice: Wlllmar Oflice� 51.Cloud Oltice: Llbertyville Oflice: <br /> 2�35 Wesl Highway 96 12075 N.Corporate Parkvray.Sle 200 112 T"Stmei NE 205 Slh Street SW 3721 23^'Slreet S 1860 Wesl Winchestcr Rd,Ste 106 <br /> SI.Paul.MN 55113 Mequon.WI 53092 Rochester,MN 55906 Willmar.MN 56201 SI.Cbud,MN 56301 Grayslake,IL 60090 <br /> Phone:651�636-4fi00 Phone:2G2�643-9032 Phone:507-282�210� Phane:32(7-214-9557 Phone,320�251-0553 Phone:�47•548�6714 <br /> Fax;651-fi36-1311 Faic:262�241�4901 Fan:507-2�2�31�0 Fae:320�214•9ASB F�:920-251�6252 Fax:847-548�6979 <br />