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Im <br /> X 411 N ENGINEERS <br /> URONO <br /> ���� CRITERIUM-SCHIMNOWSKI ENGINEERS <br /> 161 DUNBAR WAY <br /> MAHTOMEDI,MN 55115 <br /> TEL 651779-7700 <br /> FAX 651779-7114 <br /> www.criterium-schimnowski.com <br /> October 18, 2017 <br /> RECEIVED <br /> Aaron Lutz OCT 1 U ,201 <br /> Outdoor Excapes <br /> 2345 Daniels Street CITY OF ORONO <br /> Long Lake, MN 55356 <br /> RE: Boulder Retaining Wall Typical Section <br /> 500 Willow Drive South <br /> Orono, Minnesota <br /> Project No. 17-2989 <br /> Dear Mr. Lutz: <br /> This letter includes important details regarding the attached design for the boulder retaining wall typical <br /> engineered sections at the above location. This design is based on a Certificate of Survey prepared by <br /> Gronberg &Associates dated September 14, 2017, and a wall layout plan provided by you. <br /> The attached typical section(s) should be referenced for construction details. Special note should be <br /> made of the wall embedment depth and the geosynthetic fabric (geogrid) length as measured from the <br /> front face of the wall if applicable. If water is encountered at the base of the wall, additional drainage and <br /> reinforcement details may be required. <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 is specific to the following parameters: <br /> • Location: Back of house at window well; 6-foot single wall with split to two 3-foot tiered walls <br /> • Minimum embedment depth = 6", or as noted <br /> • Soil conditions: Sandy Clay, friction angle = 30.0 degrees, unit weight of 120.0 Ib/ft3 <br /> • Allowable soil bearing capacity= 1,500 psf <br /> • Surcharge loads behind the walls: None <br /> • Slope at top: 10:1; Slope at bottom: 10:1 <br /> • Boulder sizes: see cross section drawing <br /> • Geosynthetic Reinforcement Fabric Type: None <br /> • Drainage pipe: Required <br /> LICENSED <br /> PROFESSIONAL <br /> ENGINEERS <br /> HOME&BUILDING INSPECTIONS <br /> STRUCTURAL EVALUATIONS <br /> ASSOCIATION RESERVE/TRANSITION STUDIES <br /> RESIDENTIAUCOMMERCIAL 5 <br /> RETAINING WALL DESIGN&EVALUATIONS <br /> z0l-7--00 <br />