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r�... ..._n.��}Y .ww� � .Wv.Y....�....y�.��.r.. � ��..�.,�� � ��� � ���. <br /> �, ' o <br /> R R <br /> � � SCHIMNOWSKI fNGINffRS <br /> CRITERIUM-SCHIMNOWSKI ENGINEERS <br /> 161 DUNBAR WAY <br /> MAHTOMEDI,MN 55115 <br /> TEL 651779-7700 <br /> P� FAX 651 779-7114 <br /> O �O www.criterium-schimnowski.com <br /> July 14, 2015 0��� <br /> Mike Kling R������� �, <br /> Landscapes Unlimited p�N a/' �`O <br /> 659 Bielenberg Drive CyECKED 8 �� (����� <br /> Woodbury, MN 55125 ����� <br /> pqT� �� � <br /> RE: Boulder Retaining Wall Typical Section <br /> 100 Kintyre Lane <br /> Orono, Minnesota <br /> Project No. 15-1774 <br /> Dear Mr. Judd, <br /> This letter is being sent to discuss our typical section for the proposed boulder retaining walls at the 100 <br /> Kintyre Lane project in Orono, Minnesota. This design is based on site layout information provided by <br /> you on July 9, 2015. <br /> The primary boulder retaining wall will be located along the driveway and around to the back of the <br /> house. The wall will vary in exposed height from about 11 feet to 1 foot. A minimum wall batter/setback of <br /> 18° (�1 inches/vertical foot) should be used. Slopes as noted below will be present at the top and bottom <br /> of the wall. No groundwater or other surcharge loads have been designed for the wall. If site conditions <br /> vary from what is shown on the 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 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 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 /> The design of the wall system assumes the following: <br /> - Soil conditions: Sandy SilUClay, friction angle = 32.0 degrees, unit weight of 120.0 Ib/ft3 <br /> - Allowable soil bearing capacity = 3,000 psf <br /> - No external surcharge loading behind walls <br /> - Slope at bottom of wall = 10:1; Slope at top = 10:1 <br /> LICENSED <br /> PROFESSIONAL <br /> ENGINEERS <br /> HOME&BUILDING INSPECTIONS <br /> STRUCTURAL EVALUATIONS <br /> ASSOCIATION RESERVE/TRANSITION STUDIES w " . <br /> RESIDENTIAL/COMMERCIAL / � <br /> RETAINING WALL DESIGN&EVALUATIONS J � � <br /> L� t�S'��"�„*�. <br />