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0 <br /> SCHIMNOWSKI ENGINEERS <br /> CRITERIUM-SCHIMNOWSKLENGINEthg <br /> 161 DUNBAR WAY <br /> MAHTOMEDI,MN 55115 `~ <br /> TEL 651779-7700 <br /> FAX 651779-7114 <br /> www.criterium-schimnowski.com <br /> June 10,2013 <br /> Louis Colson <br /> Colson Custom Homes,LLC <br /> 18001 Highway 7 ORONO <br /> Minnetonka,MN 55345 COPY <br /> RE: Boulder Retaining Wall Typical Section <br /> 4731 North Shore Drive <br /> Orono,Minnesota <br /> Project No. 13-0921 <br /> Dear Mr. Colson: <br /> This letter is being sent to discuss our typical engineered section for the proposed boulder retaining walls <br /> at the 4731 North Shore Drive project in Orono,Minnesota. This design is based on a Proposed Site Plan <br /> dated June 4,2013. <br /> The proposed boulder retaining walls will be replacing existing timber walls near the shoreline of the <br /> property. The proposed walls will be in a tiered configuration with a sloped area between them. The <br /> walls will vary in exposed height from about 8 feet to 1 foot. A minimum wall batter/setback of 18°(-3 <br /> inches/vertical foot) should be used. The walls should also be embedded(buried below grade)a <br /> minimum of 6 inches. Slopes as noted below will be present at the top and bottom of the walls. No <br /> groundwater or other surcharge loads have been designed for the wall. Protect the base of the walls from <br /> erosion with riprap if lake levels will reach that elevation. If site conditions vary from what is shown on <br /> the Typical Section,please call me to discuss other options. If smaller boulders than those shown on the <br /> attached Boulder Schedule are to be used, additional wall batter/setback or soil reinforcement may be <br /> needed. <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 boulder 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 woven landscape fabric behind the boulders to limit soil migration through the wall face. <br /> - Drainage stone,if utilized,shall consist of clean 3/4" to 1.5"crushed stone <br /> The design of the wall system assumes the following: <br /> - Soil conditions: Sandy Silt/Clay,friction angle=30.0 degrees, unit weight of 120.0 lb/ft3 <br /> LICENSED <br /> PROFESSIONAL <br /> ENGINEERS <br /> HOME&BUILDING INSPECTIONS <br /> STRUCTURAL EVALUATIONS <br /> ASSOCIATION RESERVE/TRANSITION STUDIES <br /> RESIDENTIAVCOMMERCIAL <br /> RETAINING WALL DESIGN&EVALUATIONS <br />