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� <br /> • �Bonestroo <br /> Mem o o Rosene <br /> AnderOk 6 <br /> �Associates <br /> , Engineers 6 Archltects <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 /> Summary 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,lnc. www.bonestroo.com <br /> ❑St.Paul ONice: ❑Milwaukee Offlce: ❑Rochester OHice: ❑Wlllmar Of�ee: ❑St Cloud OHIce: ❑Lfbertyvilla OHfce: <br /> 2335 West Highway 36 12075 N.Corporate Parf.way,Sle 200 112 7�SUeel NE 205 51h SUeel SW 3721 23ro SVeelS 1860 West Winchesler Rd,Ste 106 <br /> St.Paul,MN 55113 Mequon,WI 53092 Rochesler,MN 55906 Nhllmar,MN 56201 51.Cbud,MN 56301 Grayslake,IL 60030 <br /> Phone:651-636-0600 Phone:262•64&9032 Phone:507-2B2-2f00 Phone:320-2149557 Phone:320-251-4553 Phone:847-54&6774 <br /> Faz:651-6361311 Faz:262-241-4901 Fax:507-282-3100 Faz:320-2149458 Fax:320-251-6252 Fax:847-548•6979 <br />