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---�. � ---�--- �-- �--�;, � � � �. <br /> 0 <br /> l : , <br /> �I, ;�, <br /> � .rt � SCHIMNO WSK1 f NGINFERS <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 31, 2014 <br /> (Revised December 22, 2015) <br /> Mitchell Cookas <br /> Solution Blue <br /> 318 Cedar Street <br /> Saint Paul, MN 55101 <br /> RE: Boulder Retaining Wall Typical Section <br /> 1410 Cherry Place <br /> Orono, Minnesota <br /> Project No. 14-1462 <br /> Dear Mr. Cookas: <br /> This revised letter is being sent to discuss our typical engineered section for the proposed boulder <br /> retaining walls at the 1410 Cherry Place in Orono, Minnesota. This design is based: a Landscape Plan <br /> prepared by W Landscapes dated October 25, 2014; a Certificate of Survey for the property prepared by <br /> Gronberg and Associates dated October 27, 2014; and a site layout plan provided by you on October 31, <br /> 2014. Additional written information was provided by you on December 22, 2015, regarding construction <br /> means and methods. <br /> There are several retaining walls located on the back/lake side of the house. They vary in exposed height <br /> from about 6 feet to 1 foot. Included is a two-tiered retaining wall section with a total height of <br /> approximately 11 feet (5' bottom wall, 6' upper wall, 2.5' distance between the walls). A minimum wall <br /> batter/setback of 8° (�1 inches/vertical foot) should be used. Slopes as noted below will be present at the <br /> top and bottom of the walls. No groundwater or other surcharge loads have been designed for the walls. <br /> If site conditions vary from what 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 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 /> - Soil conditions: Sandy SilUClay, friction angle = 30.0 degrees, unit weight of 120.0 Ib/ft3 <br /> - Allowable soil bearing capacity = 2,000 psf <br /> - No external surcharge loading behind walls <br /> - Slope at bottom of wall = 10:1; Slope at top = 10:1 <br /> - Minimum embedment depth = 6" <br /> - Boulder Type: 12"-48" <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 /> �`�0 �'�1 �iCQ. - 2Ut4- 01 l OS' <br />