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� � o <br /> �w �F SCH1M NO W SKl ENGI NEERS �O �PY <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 /> October 31, 2014 <br /> John Hink <br /> Solution Blue <br /> 318 Cedar Street <br /> Saint Paul,MN 55101 <br /> RE: Boulder Retaining Wall Typical Section <br /> 1410 Cherry Place <br /> Orono, Minnesota <br /> Project No. 14-1462 <br /> Dear Mr. Hink: <br /> This letter is being sent to discuss our typical engineered section for the proposed boulder retaining walls <br /> at the 1410 Cherry Place in Orono, Minnesota. This design is based: a Landscape Plan prepared by W <br /> Landscapes dated October 25, 2014; a Certificate of Survey for the property prepared by Gronberg and <br /> Associates dated October 27, 2014; and a site layout plan provided by you on October 31, 2014. <br /> There are several retaining walls located on the back/lake side of the house. They vary in exposed height <br /> from about 3 feet to 1 foot. Included is a two-tiered retaining wall section with a total height of <br /> approximately 6 feet. A minimum wall batter/setback of 8° (�1 inches/vertical foot) should be used. <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 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 /> - Soil conditions: Sandy SilUClay, friction angle=30.0 degrees, unit weight of 120.0 lb/ft3 <br /> - Allowable soil bearing capacity =2,000 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 <br /> RESIDENTIAUCOMMERCIAL <br /> RETAINING WALL DESIGN&EVALUATIONS <br />