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SCHIMNOWSKI ENGINEERS <br /> CRITERIUM-SCHIMNOWSKI ENGINEERS <br /> 161 DUNBAR WAY <br /> MAHTOMEDI,MN 55115 <br /> TEL 651 779-7700 <br /> �OP� FAX 651 779-7114 <br /> July 26, 2016OKOt4Owww.criterium-schimnowski.com <br /> Todd Irvine <br /> Keenan & Sveiven, Inc. <br /> 15119 Minnetonka Boulevard <br /> Minnetonka, MN 55345 <br /> RE: Boulder Retaining Wall Typical Section <br /> 320 Woodhill Drive (Paulucci Residence) <br /> Orono, Minnesota <br /> Project No. 16-2297 <br /> Dear Mr. Irvine: <br /> This letter includes important details regarding the attached design for the boulder retaining wall typical <br /> engineered section at the above location. This design is based on partial project plans prepared by <br /> Keenan & Sveiven, Inc. dated July 21, 2016. Additional information requested by Criterium-Schimnowski <br /> Engineers but not provided includes: geotechnical site survey and soil data. <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. <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: West of house near wooded area <br /> • Exposed heights: One 4-foot maximum height wall <br /> • Minimum embedment depth = 6", 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 walls: None <br /> • Slope at top: 5:1 max <br /> • Slope at bottom: 5:1 max <br /> • Boulder sizes: see cross section drawing <br /> • Geosynthetic Fabric Type: Required <br /> • Drainage pipe: Required for all walls <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 />