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1645 Bohns Point Road (Church Residence), Orono,Minnesota <br /> ' November 25, 2013 <br /> Page 2 of 3 <br /> The design of the wall system assumes the following: <br /> - Soil conditions: Sandy Silt/Clay, friction angle= 30.0 degrees, unit weight of 120.0 lb/ft3 <br /> - Allowable soil bearing capacity=2,000 psf <br /> - No external surcharge loading behind walls <br /> - Slope at bottom of wa11= 10:1; Slope at top = 10:1 <br /> - Minimum embedment depth = 6" <br /> - Boulder Type: 12"-36" <br /> Direct concentrated surface drainage away from the walls. The wall design was performed using the <br /> design guidelines presented in the third edition of the "Design Manual for Segmental Retaining Walls" <br /> (DMSRW) published by NCMA in 2009. If soil conditions, proposed wall layouts, or other design <br /> parameters vary from that assumed, a revised analysis may be needed. Please call me if you have any <br /> questions or need more information. Thank you. <br /> Sincerely, <br /> '�.� -� <br /> � r _ <br /> Paul Schimnowski, PE <br /> I <br /> CRITERIUM-SCHIMNOWSKI ENGINEERS <br /> TEL 651 779-7700 <br /> � <br />