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° ORONO COPY <br /> SCHIMNOWSKI ENGINEERS <br /> CRITERIUM-SCHIMNOWSKI ENGINEERS <br /> 161 DUNBAR WAY <br /> MAHTOMEDI,MN 55115 <br /> TEL 651 779-7700 <br /> FAX 651779-7114 <br /> www.criterium-schimnowski.com <br /> April 17,2014 <br /> Daryl Emery <br /> 3740 Togo Road <br /> Wayzata,MN 55391 <br /> RE: Boulder Retaining YP Wall Typical Section <br /> 3740 Togo Road <br /> Wayzata,Minnesota <br /> Project No. 14-1 lxx <br /> Dear Mr.Emery: <br /> This letter is being sent to discuss our typical engineered section for the proposed boulder retaining wall <br /> at the 3740 Togo Road project in Wayzata,Minnesota. This design is based on my observations and <br /> verbal information provided by you during a site visit on April 15,2014. <br /> The boulder retaining walls will be located on the east and north sides of the existing house. The north <br /> wall will be about 30 feet long and will vary in exposed height from about 6 feet to 1 foot. For about 20 <br /> feet,the east walls will be in a tiered configuration with each wall being about 4 feet tall. The remaining <br /> 20 to 30 feet of the wall will vary in exposed height from about 7 feet to 1 foot. A minimum embedment <br /> of 6 inches and minimum wall batter/setback of 18° (-1 inches/vertical foot)should be used for the walls. <br /> Slopes as noted below will be present at the top and bottom of the walls. No groundwater or other <br /> surcharge loads have been designed for the walls. If site conditions vary from what is shown on the <br /> Typical Section,please call me to discuss other options. <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 or lateral directions. <br /> - Each stone shall bear on two or more rocks below it with good flat-to-flat contact. <br /> j - Compact any structural fill place behind the drainage zone to 95%standard proctor. <br /> - Install woven landscape fabric behind the stone to limit soil migration through the wall face. <br /> - Drainage stone shall consist of clean 3/4" to 1.5"crushed stone <br /> The attached typical section should be referenced for the appropriate wall section height. Special note <br /> should be made of the wall embedment depth and the geosynthetic fabric(geogrid)length,if required,as <br /> measured from the front face of the wall. Refer to retaining wall industry standard specs for installation <br /> information and details. <br /> � ; s <br /> LICENSED j <br /> PROFESSIONAL <br /> ENGINEERS <br /> HOME&BUILDING INSPECTIONS <br /> STRUCTURAL EVALUATIONS <br /> ASSOCIATION RESERVE/TRANSITION STUDIES <br /> RESIDENTIAUCOMMERCIAL ; <br /> RETAINING WALL DESIGN&EVALUATIONStj', ,. <br />