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February 9, 2024 <br />Alex Koumoutsos <br />Landscape Renovations <br />12515 40th Street South <br />Afton, MN 55001 <br />Submitted by email: akoumoutsos@landscaperenovations.com <br />RE: Boulder Retaining Wall Typical Section <br />Project Location: 2525 Dunwoody Avenue, Wayzata, Minnesota <br /> Project No. 24-7666 <br />Dear Mr. Koumoutsos: <br />This letter includes important details regarding the attached design for the typical engineered section of <br />the boulder retaining walls at the above location. This design is based on wall layout information provided <br />by you in an email dated January 30, 2024, including a Grading Plan prepared by Landscape <br />Renovations dated January 30, 2024. <br />The attached typical section(s) should be referenced for construction details. Special note should be <br />made of the wall embedment depth. <br />Refer to industry standard practice references for installation information, specifications, and details. <br />- Boulders shall be placed to avoid continuous joint planes in vertical directions. <br />- Each stone shall bear on two or more rocks below it with good flat-to-flat contact. <br />- Compact any structural fill place behind the drainage zone to 95% standard proctor. <br />- Install non-woven landscape fabric behind the stone to limit soil migration through the wall face. <br />- Drainage stone shall consist of clean sand or 3/4” to 1.5” crushed stone. <br /> <br />The design of the wall system is specific to the following parameters: <br /> Location: Replacement of the existing segmental retaining walls on the slope to the lake <br /> Maximum exposed height: Tiered walls as shown on Grading Plan; 12-foot total system height <br /> Minimum embedment depth = 6“, or as noted <br /> Soil conditions: Silty/clayey sand, friction angle = 30.0 degrees, unit weight of 120.0 lb/ft3 <br /> Required soil bearing capacity = 1500 psf <br /> Surcharge load behind the walls: None <br /> 3:1 slope at top and bottom of wall system and between wall tiers <br /> Boulder sizes: see cross section drawing <br /> Geosynthetic Reinforcement Fabric Type: Not required <br /> Drainage pipe: Required <br /> <br />This wall system has not been designed for ground water surcharge loads. Direct all surface drainage <br />away from the wall. Methods to do so include but are not limited to the following: drainage swale, site <br />grading, retention ponds, etc. Details of water control are left to the wall contractor. Additional information <br />requested by Criterium-Schimnowski Engineers but not available includes: geotechnical site survey and <br />soil data. Please contact Criterium-Schimnowski to provide additional site assessment services if desired. <br />