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November 18, 2022 Josh Prust Valdes Lawn Care & Snow Removal Submitted by email: jpeterson@valdeslawn.com RE: Timber Retaining Wall Upper Tier Project Location: 2815 Casco Point Road, Wayzata, Minnesota Project No. 22-6589 Dear Mr. Prust: This letter includes important details regarding the completion of planned work at the above location. These recommendations are based on my original design dated August 24, 2022, and my site observations and discussion with you on October 31 and November 17, 2022. This previously designed work is recommended to be completed at this time to improve the site grading by reducing the steepness of some slopes and will reduce the chances of erosion at the top of the newly built, tiered timber retaining wall system. I recommend that the final, planned timber retaining wall be constructed 4 to 6 feet behind the uppermost existing wall. The wall should extend from several feet inside both the east and west property lines. Most of the wall will have a maximum exposed height of about 2-feet. The wall height will increase to about 4- feet tall near each end where existing slopes increase. Following completion of the final wall, erosion control should be established and maintained in all disturbed areas. Areas of concentrated runoff should be directed away from the top of the walls. As before, the attached typical section should be referenced for construction details. Special note should be made of the wall embedment depth and the tieback/header and deadmen lengths. Refer to local building codes, industry specifications, and American Wood Preservers Association for installation information and details. The design of the wall system assumes the following:  Wall location: 4 to 6 feet behind the top of the existing upper wall  Wall height(s): 4-feet to 2-feet as noted (maximum exposed heights)  Minimum embedment depth = 6” min., or as noted  Soil conditions: Silty/Clayey Sand, friction angle = 30.0 degrees, unit weight of 125.0 lb/ft3  Required minimum soil bearing capacity = 1500 psf  Surcharge load at top of wall: None  5:1 maximum slope at top and bottom of wall  Wall Type: 6”x5” Treated Timber  Connections: 3/8” galvanized or treated spikes  Drainage pipe: Required As we discussed, you are planning to that the as-built conditions surveyed for city consideration. Please forward this to me when it is completed.