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� � CIVIL DESIGN <br /> � � ��� �= � } t. <br /> � ." b <br /> � «�"� �_ i Ll; I� <br /> MEMORANDUM CITY OF ORONO <br /> DATE: July 22, 2011 <br /> TO: Jim Lillesve—Charles Cudd De Novo, Inc. <br /> FROM: Tim Hatten—Civil Design Professionals <br /> RE: 3315 Graham Hill Road Boulder Retaining Wall (1 1-110) <br /> Orono, Minnesota <br /> Design Assumptions: <br /> Boulder Wall, Minimum 15° Wall Batter Safety Factors <br /> Coulomb Earth Pressure Design Analysis <br /> Live Load: 150 PSF (Driveway) Slidin 1.50 <br /> Dead: Load: None Overturnin 1.50 <br /> Toe Slope: None Bearin 2.00 <br /> Back Slope: None <br /> Soil Design Properties: <br /> � y c <br /> Retained Soil 26° 120 PCF 0 (Onsite Soils) <br /> Foundation Soil 26° 120 PCF 0 (Onsite Soils) <br /> Notes: <br /> Soils information was provided by Jim Lillesve of Charles Cudd De Novo, Inc. for this <br /> preliminary design. The onsite material is assumed to be a Clayey Sand with an internal friction <br /> angle of 26°. Where unsuitable soils are found, a subcut may be required and structural fill shall <br /> be placed and compacted to provide an adequate bearing foundation. CDP shall be contacted if <br /> the above soil strength parameters can not be met and a redesign may be required <br /> Wall layouts and elevations obtained fram Certificate of Survey prepared by Acre Land <br /> Surveying dated 7.6.201 l. <br /> See project specifications for additional information and reguirements. <br /> We appreciate the opportunity of providing services to you. If you have any questions or <br /> comments regarding this project, please feel free to contact us. <br /> Civil Design Professionals • 8609 Lyndale Ave. S., Suite 200 Bloomington, MN 55420 • Ofiice 612-284-3696 • www.cdp-us.com <br />