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� o <br /> r <br /> SCHlMNO WSK1 f NG � NEf RS <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 /> July 3, 2015 <br /> Mike Kling <br /> Landscapes Unlimited <br /> 659 Bielenberg Drive <br /> Woodbury, MN 55125 REVO���E� fa�r C�1�?E �C�a�ri�� �A �(�� <br /> RE: Boulder Retaining Wall Typical Section p�qN CHECKED BY ATE '� <br /> 200 Bayside Trail, Orono, Minnesota <br /> Project No. 15-1724 �� <br /> Dear Mr. Kling: <br /> This letter is being sent to discuss the typical engineered sections for the boulder retaining walis at the <br /> above location. The walls are located at the back of the house in single and tiered wall configurations, as <br /> well as along the driveway. This design is based on a site layout plan provided by you via email on June <br /> 18, 2015. <br /> The attached typical section(s) should be referenced for construction details. Special note should be <br /> made of the wall embedment depth and the geosynthetic fabric (geogrid) length as measured from the <br /> front face of the wall if applicable. <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 /> - Optional drainage stone shall consist of clean 3/4" to 1.5"crushed stone <br /> The design of the wall system assumes the following: <br /> • Location: back of house and along driveway <br /> • Length: 120 feet, approx. <br /> • Exposed height:varies from 1 to 6 feet <br /> • Minimum embedment depth = 12", as noted <br /> • Soil conditions: Sandy Clay, friction angle=30.0 degrees, unit weight of 120.0 Ib/ft3 <br /> • Allowable soil bearing capacity=2,500 psf <br /> • No surcharge loads behind the wall <br /> • Level at top and bottom <br /> • Boulder sizes: see cross section drawing <br /> • Geosynthetic Fabric Type: n/a <br /> Direct all surface drainage away from the wall. The wall design was performed using the design <br /> guidelines presented in the third edition of the"Design Manual for Segmental Retaining Walls" (DMSRW) <br /> LICENSED <br /> PROFESSIONAL <br /> ENGINEERS <br /> HOME&BUILDING INSPECTIONS <br /> STRUCTURALEVALUATIONS <br /> ASSOCIATION RESERVE/TRANSITION STUDIES <br /> RESIDENTIAL/COMMERCIAL <br /> RETAINING WALL DESIGN&EVALUATIONS <br />