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SCHIMNOWSKI <br />CRITERIUM <br />ENGINEERS <br />November 18, 2022 <br />Josh Prust <br />Valdes Lawn Care & Snow Removal <br />Submitted by email: jpeterson@vaidesiawn.com <br />RE: Timber Retaining Wall Upper Tier <br />Project Location: 2815 Casco Point Road, Wayzata, Minnesota <br />Project No. 22-6589 <br />Dear Mr. Prust: <br />This letter includes important details regarding the completion of planned work at the above location. <br />These recommendations are based on my original design dated August 24, 2022, and my site <br />observations and discussion with you on October 31 and November 17, 2022. <br />This previously designed work is recommended to be completed at this time to improve the site grading <br />by reducing the steepness of some slopes and will reduce the chances of erosion at the top of the newly <br />built, tiered timber retaining wall system. <br />I recommend that the final, planned timber retaining wall be constructed 4 to 6 feet behind the uppermost <br />existing wall. The wall should extend from several feet inside both the east and west property lines. Most <br />of the wall will have a maximum exposed height of about 2 -feet. The wall height will increase to about 4 - <br />feet tall near each end where existing slopes increase. <br />Fallowing completion of the final wall, erosion control should be established and maintained in all <br />disturbed areas. Areas of concentrated runoff should be directed away from the top of the walls. <br />As before, the attached typical section should be referenced for construction details. Special note should <br />be made of the wall embedment depth and the tieback/header and deadmen lengths. Refer to local <br />building codes, industry specifications, and American Wood Preservers Association for installation <br />information and details. <br />The design of the wall system assumes the following: <br />• Wall location: 4 to 6 feet behind the top of the existing upper wall <br />• Wall height(s): 4 -feet to 2 -feet as noted (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 Ib1ft3 <br />• Required minimum soil bearing capacity = 1500 psf <br />• Surcharge load at top of wail: None <br />• 5:1 maximum slope at top and bottom of wall <br />• Wall Type: 6"x5" Treated Timber <br />• Connections: 3/8" galvanized or treated spikes <br />+ Drainage pipe: Required <br />As we discussed, you are planning to that the as -built conditions surveyed for city consideration. Please <br />forward this to me when it is completed. <br />Independently Owned and Operated <br />161 Dunbar Way / Mohlomedi, MN 55115 <br />❑: 651,779,7700 / criterium-sch.imnowski.com <br />