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2,11 .00¢25 <br /> • <br /> SCHIMNOWSKI ENGINEERS <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 /> February 28, 2018 <br /> WkJ4wa(U row() <br /> Lincoln Danforth <br /> Yardscapes, Inc. Of l <br /> ' '� pErfioJ I Chub fc <br /> 8609 Harriet Avenue South <br /> Bloomington, MN 55420 <br /> RE: Granite Cube Retaining Wall Design <br /> 1700 Bohns Point Road <br /> Orono, Minnesota <br /> Project#18-3131 <br /> Dear Mr. Danforth: <br /> This letter includes important details regarding the attached design for the granite stone retaining wall <br /> typical engineered section at the above location. This design is based on a wall layout plan provided by <br /> you dated February 12, 2018. <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 /> - Stones 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: South side of structure at shoreline with a similar tiered-wall configuration to the existing <br /> walls on the north side of the structure. (See photo of existing conditions below.) <br /> • Exposed height: 11 feet max. 2-tiered wall <br /> • Minimum embedment depth = 6", or as noted <br /> • Soil conditions: Silt/Clay, friction angle = 28.0 degrees, unit weight of 125.0 Ib/ft3 <br /> • Allowable soil bearing capacity = 2,000 psf <br /> • Surcharge loads behind the wall: None <br /> • Slope at top of upper wall: 10:1 <br /> • Slope between upper and lower wall: 10:1 <br /> • Slope at bottom of lower wall: 5:1 <br /> • Boulder sizes: Granite rectangular boulders (10"H, 18"W, 24"D, typical minimum dimensions) <br /> • Geosynthetic Reinforcement Fabric Type: None required <br /> • Drainage pipe: Required <br /> LICENSED <br /> PROFESSIONAL <br /> ENGINEERS <br /> HOME&BUILDING INSPECTIONS <br /> STRUCTURAL EVALUATIONS <br /> ASSOCIATION RESERVE/TRANSITION STUDIES <br /> RESIDENTIAL/COMMERCIAL <br /> RETAINING WALL DESIGN&EVALUATIONS <br />