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:�► � � '�: �" " '� * �' <br /> � �� <br /> �_ .. � SCH / MNOWSKI ENGINEERS <br /> CRITERIUM-SCHIMNOWSKI ENGINEERS <br /> 161 DUNBAR WAY <br /> MAHTOMEDI,MN 55115 <br /> TEL 651779-7700 <br /> FAX 651 779-7114 <br /> www.criterium-schimnowski.com <br /> October 29, 2011 <br /> John Sather <br /> Yardscapes, Inc. <br /> 8609 Harriet Ave South <br /> Bloomington,MN 55420 <br /> RE: Boulder Retaining Wall Typical Section <br /> Whipple Residence <br /> Hennepin County, Minnesota <br /> Project No. 11-0564 <br /> Dear Mr. Sather: <br /> This letter is being sent to discuss our typical engineered section for the proposed boulder retaining walls <br /> at the Whipple Residence in Hennepin County,Minnesota. This design is based on wall layout plan <br /> prepared by Gronberg&Associates dated October 4,2011. <br /> I understand that the proposed boulder retaining walls will have a maximum exposed height of 10 feet. <br /> They are located at the northeast house corner near the driveway, and on the north side of the house. The <br /> walls will be tied into existing retaining walls. A minimum wall batter/setback of 18° (�3 inches/vertical <br /> foot) should be used. Slopes as noted below will be present at the top and bottom of the wall. No <br /> groundwater or other surcharge loads have been designed for the wall. If site conditions vary from what <br /> is shown on the Typical Section, please call me to discuss other options. <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 or lateral directions. <br /> - Each boulder 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 boulders to limit soil migration through the wall face. <br /> - Drainage stone shall consist of clean 3/4" to 1.5"crushed stone <br /> The design of the wall system assumes the following: <br /> - Soil conditions: Sandy SildClay, friction angle=30.0 degrees,unit weight of 120.0 lb/ft3 <br /> - Allowable soil bearing capacity= 1,500 psf <br /> - 100-psf driveway surcharge loading behind wall <br /> - Slope at bottom of wa11= 10:1; Slope at top= 10:1 <br /> - Minimum embedment depth= 12" <br /> - Boulder Type: 18"-54" <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 />