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- � �� � <br /> �Bonestroo <br /> Me�n o m�Rosene <br /> Anderlik& <br /> �Associates <br /> Englnccrs 6 Archltects <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 quality <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. The rain garden located on the nor�hwest corner of the site provides 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 100-yr event. The driveway crown is one . � <br /> foot above this elevation at 940.9. <br /> Bonesfroo,Rosene,Anderlik and Associafes,Inc. www.bonestroo.com <br /> St.PaulOHke: MilwaukeaOHke: RacheslerOHkc: WIIImarONke: St.CloudOHke: LlbeAyvi11e0Nke: <br /> 2335 Wesl Highway 36 12075 N.Carparale Parkviay.Ste 2�D 112 7�^Streel NE 205 51h Slreet SW 3721 Z�"Slrccl S 1B60 Wesl Winchesler Rd,Sle tOfi <br /> SI.Paul,MN 55113 Mequan,WI 53092 Raheslcr.MN 55906 Wi9nwr,MN 56201 SI.Cbud,MN 56301 Grayslake.IL 60030 <br /> Phonc:651•696•4G00 Phone:262•643�9032 Phmie:507-282-2100 Phane:32D-214•9557 Phone:320-251-4553 Phone:847-548•6774 <br /> Fax:651•63E1311 Fax:262-241-4901 Fax:5W482•9f00 Fax:320•214•9458 Fac:320•251-6252 Fax:847-548-6979 <br />