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. <br /> � � �� � � �� o <br /> .�tk��� <br /> SCIf 1M1� t� WSKI ElU �GINf ERS <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 28, 2015 <br /> Lincoln Danforth <br /> Yardscapes, Inc. <br /> 8609 Harriet Avenue South <br /> Bloomington, MN 55420 <br /> RE: Granite Cube Retaining Wall Typical Section <br /> 3926 Cherry Avenue <br /> Orono, Minnesota <br /> Project#15-1804 <br /> Dear Mr. Danforth, <br /> This letter is being sent to discuss our typical engineered section for the rectangular boulder retaining wall <br /> at the 3926 Cherry Avenue project in Orono, Minnesota. This design is based on a wall layout plan <br /> provided by you dated May 5, 2015. <br /> From my observations and the information provided by you, the 2-tiered granite rectangular boulder <br /> retaining walls are located along near the corner of the house and each have a maximum exposed height <br /> of 5 feet. A minimum embedment depth of 6" is to be maintained for the walls. The grades at the top and <br /> bottom of the walls are generally level. No other surcharge or groundwater loads have been designed for <br /> the walls. <br /> The attached typical section should be referenced for the F �' <br /> appropriate wall section height. Special note should be �� - �� ��������=- ����� <br /> made of the wall embedment depth and the geosynthetic �'� ��„�o � a�,� � � ~ � <br /> fabric (geo-grid) length as measured from the front face of � �� <br /> the wall. Refer to Retaining Wall Industry Standard Specs � �. � <br /> "°� �� `� <br /> for installation information and details. �� �� � �� � _e � �� � �� ����� .��;r ;���' <br /> °��, � ���� � � <br /> The design of the wall system assumes the following: �'�'�°; �`�; � ,��. . ; '� � <br /> - Soil conditions: Silty/Clayey sand, friction angle =30A ��;�� a ���,�, <br /> degrees, unit weight of 120.0 Ib/ft3 � ���� � �^°� � � <br /> - Required soil bearing capacity=2,000 psf �� � �� � ` �'� � � <br /> , �� �� � � <br /> - No surcharge load behind the wall ����� ,�; � ,��� `�`�� -m �-�=�� <br /> � _ ; � .. _ . -�.,: <br /> - Level slope at top and bottom <br /> � a.�.�� , <br /> - Minimum embedment depth =6" ' ' <br /> - Block Type: Granite rectangular boulders (10"H, 16"W, <br /> 24"D, typical minimum dimensions) <br /> - Geosynthetic Fabric Type: None required �����V��� <br /> LICENSED DEC p � 2p�5 <br /> PROFESSIONAL <br /> ENGINEERS CITY OF ORO�L�o <br /> HOME&BUILDING INSPECTIONS <br /> STRUCTURAL EVALUATIONS <br /> ASSOCIATION RESERVE/TRANSITION STUDIES <br /> RESIDENTIAUCOMMERCIAL <br /> RETAINING WALL DESIGN&EVALUATIONS <br />