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SCHIMNOWSKI <br />CRITERIUM` <br />ENGINEERS <br />August 24, 2022 <br />Josh Peterson <br />Valdes Lawn Care & Snow Removal <br />Submitted by email: jpeterson@valdeslawn.com <br />RE: Segmental Retaining Wall Typical Section <br />Project Location: 2815 Casco Point Road, Wayzata, Minnesota <br />Project No. 22-6589 <br />Dear Mr. Peterson: <br />This letter includes important details regarding the attached design typical engineered sections for the <br />timber retaining walls at the above location. This design is based on wall layout information provided by <br />you in an email on August 23, 2022, including: a Certificate of Survey prepared by Gronberg and <br />Associates dated May 18, 2022; measurements of the wall heights and face to face distances; and <br />photos of the existing conditions. <br />The attached typical section should be referenced for construction details. Special note should be made <br />of the wall embedment depth and the tieback/header and deadmen lengths. Refer to local building <br />codes, industry specifications, and American Wood Preservers Association for installation information and <br />details. <br />The design of the wall system assumes the following: <br />• Wall location: Replacement of the existing tiered timber walls in the same configuration <br />• Wall height(s): 7 -feet to 2 -feet as noted on the attached sketch, with minimum face-to-face <br />distance between the walls (maximum exposed heights) <br />Minimum embedment depth = 6" min., or as noted <br />• Soil conditions: Silty/Clayey Sand, friction angle = 30.0 degrees, unit weight of 125.0 Ib/ft3 <br />• Required minimum soil bearing capacity = 1500 psf <br />• Surcharge load at top of walls: Decks as noted <br />• 10:1 maximum slope at top and bottom of walls <br />• Wall Type: 6" Treated Timber <br />• Connections: 3/8" galvanized or treated spikes <br />• Drainage pipe: Required <br />These walls have not been designed for ground water surcharge loads. Direct all surface and <br />groundwater drainage away from the walls. Methods to do so include but are not limited to the following: <br />drainage swale, site grading, retention ponds, etc. Details of water control are left to the wall contractor or <br />the site civil engineer. Please contact Criterium-Schimnowski to provide additional site assessment <br />services if desired. <br />The wall design was performed using the design guidelines presented in timber retaining wall industry <br />guidelines and recommendations. Additional information requested by Criterium-Schimnowski Engineers <br />but not available includes: geotechnical site survey and soil data. If soil conditions, proposed wall layouts, <br />or other design parameters vary from that assumed, a revised analysis may be needed. Please call me if <br />you have any questions or need more information. <br />Independently Owned and Operated <br />161 Dunbar Way / Mahtomedi, MN 55115 <br />O: 651.779.7700 / criterium-schimnowski.com <br />