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'nl Bonestroo <br /> � Me m o ��.Rosene <br /> �Anderlik& <br /> �Associates <br /> Cn9ineers 6 Architects <br /> Project Name: Trinity Lutheran Church Client: City of Orono <br /> To: Tom Kellogg File No: 139-05-000 <br /> From: Lance Hoff Date: 9-14-05 <br /> Re: Drainage Review <br /> Engineer: BKBM Engineers, MPLS <br /> Submittal: Drainage Calculations, Rational Storm Sewer Design Calculations, Plans <br /> Plan Sheets: Grading and Drainage, Storm Sewer, Details � <br /> Date of Plans: 9-6-05 <br /> Date Received: 9-12-05 <br /> Summarv of Recommendations <br /> Based on our review of the Trinity Lutheran Church site, we offer the following comments. Grading and <br /> drainage are generally good. Rate control requirement has been met for the site. The storm sewer has <br /> been adequately designed. The only comments are in regards to water quality treatment, which has not <br /> been addressed by the plans. Comments follow below: <br /> 1. The pond should be modified to include water quality treatment for the entire site. Treatment <br /> should satisfy NURP requirements (wet volume equal to the runoff generated during a 2.5" <br /> rainfall event). Our calculations show that 0.315 ac-ft of wet storage must be provided. <br /> 2. A 10' wide aquatic bench with slopes no steeper than 10:1 must be provided immediately below <br /> the NWL. <br /> 3. The pond outlet structure must be modified to provide skimming. <br /> 4. The pond inlet and outlet should be separated as much as feasible to prevent short circuiting. <br /> 5. The pond EOF should be shown as armored to prevent erosion. Riprap or properly installed <br /> permanent erosion control mat would be acceptable. <br /> Bonestroo, Rosene,Anderlik and Associates,Inc. www.bonestroo.com <br /> St.Paul Ottice: Mllwaukee Oftice: Rochester Offlce: Wl�lmar Office: St.Cloud Office: Li6eAyville OMice: <br /> 2335 West Highway 36 12075 N.Corporale Parkway,Sle 200 112 Ph Street NE 205 51h Streel SW 3721 23�"Slreel S 1860 Wesl Winchester Rd,Ste 106 <br /> SI.Paul,MN 55113 Mequon,WI 53092 Rochesler,MN 55906 Willmar,MN 56201 St.Cbud,MN 56301 Grayslake,IL 60030 <br /> Phone:651-s36�4600 Phone:262-643-9032 Phane:507-282-2100 Phone:32U-214-9557 Phone:320-251�4553 Phone:847-548•6774 <br /> fan:651-636-1311 Fax:262-241-49�1 Faz:507-282-3100 Fax:320-214-9458 Faz:320-251-6252 Fax:847-548-G979 <br />