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C <br /> . � � � � � �: � <br /> �- � � 5CH1MN0 WSK1 EN � 1Nf ERS <br /> CRITERIUM-SCHIMNOWSKI ENGINEERS <br /> 161 DUNBAR WAY <br /> RECEIVED MAHTOMEDI, MN 55115 <br /> TEL 651779-7700 <br /> FAX 651 779 7114 <br /> www.criterium-schimnowski.com <br /> SEP 2 2 201� <br /> August 3, 2015 <br /> (Revised August 19, 2015) CIIY OF ORONO <br /> , copy <br /> John Leupke O��NO <br /> 2595 Lydiard Circle <br /> Orono, MN 55331 <br /> RE: Bouider Retaining Wall Typical Section <br /> Project Address: 2595 Lydiard Circle, Orono, MN 55331 <br /> Project No. 15-1811 <br /> Dear Mr. Leupke: <br /> This letter is being sent to discuss several options for our typical engineered section for the boulder <br /> retaining wall at the above location. This design is based on information and partial site plan provided by <br /> you via email on July 30`h, 2015. The proposed boulder wall will be replacing an existing boulder retaining <br /> wall. <br /> The attached typical section shouid be referenced for construction details. Special note should be made <br /> of the wail embedment depth and the geosynthetic fabric (geogrid) length as measured from the front <br /> face of the wall if applicable. <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 /> • Location: To replace existing retaining wall south of house <br /> • Length: Approximately 50' <br /> • Maximum exposed height: 8' <br /> • Minimum embedment depth = 12", as noted <br /> • Soil conditions: Sandy Clay, friction angle = 30.0 degrees, unit weight of 125.0 Ib/ft3 <br /> • Allowable soil bearing capacity = 2,000 psf <br /> • Surcharge loads behind the wali: None <br /> • Slope at top: 5:1 <br /> • Slope at bottom: 10:1 <br /> • Boulder sizes: see cross section drawing <br /> � . <br /> • Geosynthetic Reinforcement Geogrid Type: No soil reinforcement geogrid required. Woven <br /> landscape filter fabric is required behind boulders <br /> LICENSED ,� <br /> PROFESSIONAL <br /> ENGINEERS �:W1'.� <br /> a� <br /> C � <br /> HOME&BUILDING INSPECTIONS �Ar�,,,� <br /> STRUCTURAL EVALUATIONS <br /> ASSOCIATION RESERVE/TRANSITION STUDIES '1"��� �. .;��� �;'.��� <br /> RESIDENTIAUCOMMERCIAL '�" <br /> RETAINING WALL DESIGN&EVALUATIONS � � �i�N� <br /> '«��, � 9t <br /> .i�� i`.�,.,'E <br />