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v � � � ._ .: a. , <br /> . _ � � � o <br /> . � <br /> � . SCHIMNO WSKI ENG1N RS <br /> CRITERIUM-SCHIMNOWSKI ENGINEERS <br /> 161 DUNBAR WAY <br /> MAHTOMEDI,MN 55115 <br /> TEL 651779-7700 <br /> FAX 651779-7114 <br /> www.criterium-schim nowski.com <br /> July 13, 2012 <br /> Dave Kopfmann <br /> Yardscapes <br /> 8609 Harriet Ave. So. <br /> Bloomington, MN 55420 <br /> RE: Boulder Retaining Wall Typical Section <br /> McGlynn Residence <br /> Orono, Minnesota <br /> Project No. 12-0690 <br /> Dear Mr. Kopfmann: <br /> This letter is being sent to discuss our typical engineered section for the proposed boulder retaining walls <br /> at the McGlynn Residence project(Government Lot 4, Section 8-117-23) in Orono, Minnesota. This <br /> design is based on Topographic Survey prepared by Gronberg&Associates dated May 30, 2012. <br /> I understand that the proposed 3-tiered boulder retaining walls will have a ma�cimum exposed height of 4 <br /> feet each. A minimum wall batter/setback of 18° (�3 inches/vertical foot) should be used. Slopes as <br /> noted below will be present at the top and bottom of the walls. No groundwater or other surcharge loads <br /> have been designed for the walls. If site conditions vary from what is shown on the Typical Section, <br /> 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 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 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=2,500 psf <br /> - No external surcharge loading behind walls <br /> - Slope at bottom of wa11 =5:1; Slope at top= 10:1 <br /> - Minimum embedment depth=6" <br /> - Boulder Type: 12"-48" <br /> LICENSED <br /> PROFESSIONAL <br /> ENGINEERS <br /> HOME&BUILDING INSPECTIONS <br /> STRUCTURAL EVALUATIONS <br /> ASSOCIATION RESERVE/TRANSITION STUDIES '�G�a _/ � �/ L� <br /> RESIDENTIAUCOMMERCIAL '� v� 1 �� � <br /> RETAINING WALL DESIGN&EVALUATIONS p�� G�f �C�l <br /> ���U l <br />