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� :�..�`",.. .... ., �'�rove�' � _... ;; ,a' <br /> � `.� "�3,' � � . <br /> � � � 01�� COPY <br /> ��.��f��� �Y��� �'h� I :�:Nt� WS �� , f.��l � 1NfER <br /> CRITERIUM-SCHIMNOWSKI ENGINEERS <br /> 161 DUNBAR WAY <br /> MAHTOMEDI,MN 55115 <br /> TEL 651 779-7700 <br /> FAX 651779-7114 <br /> www.criteri u m-schimnowski.com <br /> September 12,2013 <br /> Lincoln Danforth <br /> Yardscapes,Inc. <br /> 8609 Han-iet Avenue South <br /> Bloomington,MN 55420 <br /> RE: Boulder Retaining Wall Typical Section <br /> 3227 Casco Circle <br /> Orono,Minnesota <br /> Project No. 13-1026 <br /> Dear Mr. Danforth: <br /> This letter is being sent to discuss our typical engineered section for the proposed boulder/stone retaining <br /> walls at the 3227 Casco Circle project in Orono,Minnesota. This design is based on a landscape plan <br /> prepared by Yardscapes,Inc.dated September 3,2013. <br /> There are several retaining walls located on the lake/south side of the house. They vary in exposed height <br /> from about 6 feet to 1 foot. Included is a two-tiered retaining wall section with a total height of <br /> approximately 5.5 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 or lateral 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 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 /> - Allowable soil bearing capacity=2,000 psf <br /> - No external surcharge loading behind walls <br /> - Slope at bottom of wa11= 10:1; Slope at top= 10:1 <br /> - Minimum embedment depth=6" <br /> - Boulder Type: 12"-36" <br /> LICENSED <br /> PROFESSIONAL <br /> ENGINEERS <br /> HOME&BUILDING INSPECTIONS <br /> STRUCTURALEVALUATIONS <br /> ASSOCIATION RESERVE/TRANSITION STUDIES <br /> RESIDENTIAUCOMMERCIAL <br /> RETAINING WALL DESIGN&EVALUATIONS <br />