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�eonestroo <br /> - Mem o v Rosene <br /> Anderlik& <br /> �Associates <br /> Englncers 6 Ar[AI[ects <br /> .... ... . .. ... <br /> Project Name: 1745 Fox Street Client: City of Orono <br /> To: Tom Kellogg File No: 139-05-000 <br /> From: Lance Hoff Date: 5-19-05 <br /> Re: Drainage Review <br /> Developer: Suad Azhari & Omar Abukhadra <br /> Engineer: Gronberg &Associates, Inc., Long Lake <br /> Submittal: Drainage Calculations, Rational Storm Sewer Design Calculations, Plans <br /> Plan Sheets: Grading and Drainage, Storm Sewer <br /> Date of Plans: 2-22-05, Latest Revision on 5-4-05 <br /> Date Received: 5-12-05 <br /> Summarv of Recommendations <br /> Based on our review of the 1745 Fox Street development, we offer the following comments. <br /> 1. Rational method storm sewer calculations should be submitted for review and approval. <br /> 2. Riprap should be provided at each flared end section (FES) including the FES discharging to <br /> the pond. <br /> 3. Outflow velocities from the FES discharging to the pond and at the pond outlet should not <br /> exceed 5 fps to avoid erosion (and resuspension of sediment in the pond). <br /> 4. The developer's engineer did a good job including a 10' wide aquatic bench at 10:1 slopes, but <br /> the remaining pond slopes vary from 2:1 to 5:1. Slopes above the pond NWL should be 4:1 or <br /> flatter. Slopes below the pond aquatic bench should be 3:1 or flatter. <br /> 5. The City's standard skimming pond outlet should be used (detail attached). <br /> 6. Low flow control should be added to the pond outlet design. For example, the addition of a weir <br /> to an elevation of 936 in combination with a 6" orifice located at the nQrmal water level will <br /> reduce 2-yr peak flows from 2.0 cfs to 0.8 cfs while raising the 100-yr HWL only 0.1' to 937.6. <br /> 7. A pond outlet detail should be included on the plans and submitted for review and approval. <br /> 8. Wetland buffers are proposed as a best management practice (BMP). Wetland buffer signs <br /> should be placed along the edge of the proposed buffer to ensure that the buffers aren't mowed <br /> Bonesfroo, Rosene,Anderlik and Associates, lnc. www.bonestroo.com <br /> ❑St.Paul Office: ❑Milwaukee Office: ❑Raches�er Office: ❑Willmar Office: ❑5l.Cloud Office: ❑Libertyville Office: <br /> 2335 West Highway 3G 12075 N.Crnparale Parkway,Sle 200 172 7w Strecl NE 205 51h Slmet SW 3721 23�^Slreel S 18G0 Wesi Wlnchesler Rd,S�e 1DG <br /> Sl.Paul,MN 55113 Mequon,WI 53092 Rochesler,MN 55906 Willrnar,MN SG2o1 Sl.Cloutl,MN 5G301 Grayslake,IL G9030 <br /> Plwne:G51-G3G-A600 Phone:2G2643-9032 Phone:501�282-Z10D Phrnre:]20-214-9557 Phoi�e:320-251-A553 Phone:847�SA&G774 <br /> fax:651-63G-1317 fax:262•241-4901 Fax:507-202-3100 Fax:320-214-9450 Fax:320-251-6252 fax:aA7-546�G979 <br />