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� � D IN <br /> IVIL ES G <br /> PRo � �i. =��� � <br /> MEMORANDUM <br /> DATE: September 13, 2012 <br /> TO: Tom Henjum- Boyer Building Corporation <br /> FROM: Michael R. Johnson, P.E. - Civil Design Professionals <br /> RE: Kapsner Residence Retaining Wall Analysis (12-296) <br /> Orono, MN <br /> Tom: <br /> I have been asked to analyze and verify whether the botilder wall construction meets minimitm standard <br /> safety requirements at the Following residential location: <br /> Kapsner Residence <br /> 75 Leaf Street <br /> Orono, MN 55356 <br /> I have been provided both photographs and a survey of as-built consrruction (attached) for use in the <br /> analysis of the existing boulder wall construction. <br /> Info: <br /> There are two set of tiered walls located on the properry that abut the foundation of the home, both on the <br /> North and West fotindation walls. <br /> North Foundation Boulder Wal1s: <br /> Lower Wall Maximum Wall Height: 25' <br /> Upper Wall Maximum Wall Height 2.5' <br /> Minimum Distance Between Reraining Walls: 5.5' <br /> West Foundation Boulder Wal1s: <br /> Lower Wa11 Ma�cimum Wall Height: 3.8' <br /> Upper Wall MaYimum Wall Height 3.5' <br /> Minimum Distance Between Retaining Wal1s: 7.6' <br /> The boulder walls have a minimum boulder depth of 20" and a wall Uatter ranging from 10°-15° <br /> It is my undersranding that the site soils are primarily a silty sand material. <br /> The slopes above, below and in between the two sets of tiered walls are relatively flat. <br /> Civil Design Professiona/s • 8609 Lyndale Ave. 5., Suite 200 Bloomington, MN 55420 • Office 612-284-3696 • www.cdp-us.com <br />