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_..�, � - ... � ... ,.,� w � <br /> - � , m� ��,nm�. � A� � <br /> ,r � o <br /> � . SC1� 11� N � WS � � F �II '� 1 �f f � RS <br /> �� <br /> w�u � � �� � ���� � <br /> CRITERIUM-SCHIMNOWSKI ENGINEERS <br /> 161 DUNBAR WAY <br /> MAHTOMEDI,MN 55115 <br /> TEL 651779-7700 <br /> FAX 651 779-7114 <br /> www.criteriu m-schim nowski.com <br /> November 26, 2013 <br /> Lincoln Danforth <br /> Yardscapes, Inc. <br /> 8609 Harriet Avenue South <br /> Bloomington,MN 55420 <br /> RE: Boulder Retaining Wall Typical Section <br /> 1645 Bohns Point Road(Church Residence) <br /> Orono, Minnesota <br /> Project No. 13-1078 <br /> Dear Mr. Danforth: <br /> This letter is being sent to discuss our typical engineered section for the proposed boulder retaining walls <br /> at the 1645 Bohns Point Road in Orono, Minnesota. This design is based on a landscape plan prepared by <br /> Yardscapes, Inc. dated October 30, 2013. <br /> There are several retaining walls being reconstructed for this project. The walls will vary in exposed <br /> height, with the tallest wall along the driveway near the garage having a maximum height of about 6 feet <br /> to 1 foot. Several additional walls near the sport court,patio areas, and along stone step/walkways are <br /> also included. A minimum wall batter/setback of 18° (�1 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 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°Io 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 /> 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 /> I I <br />