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� � <br /> , . o <br /> SCHIMNOWSK ! ENGIHEERS <br /> CRITERIUM-SCHIMNOWSKI ENGINEERS <br /> 161 DUNBAR WAY <br /> MAHTOMEDi,MN 55115 <br /> TEL 651779-7700 <br /> FAX 651779-7114 <br /> www.criterium-sch imnowski.com <br /> May 25,2012 <br /> Ann Murphy <br /> 3300 Graham Hill Road <br /> Long Lake, MN 55356 <br /> RE: Boulder Retaining Wall Evaluation <br /> 3300 Graham Hill Road <br /> Long Lake, Minnesota <br /> Project No. 12-0658 <br /> Deaz Ms. Murphy: <br /> This letter is being sent per your request regarding the existing boulder retaining walls at 3300 Graham <br /> Hill Road in Long Lake,Minnesota. This evaluarion is based on observations I made during a site visit <br /> on May 24,2012, and verbal statements made to me by the wall contractor,John Christoferson of <br /> Minnesota Green,regarding construction means and methods. <br /> The construction of the retaining walls appeazs to be structurally stable and in general conformance with <br /> boulder retaining wall indushy standazds. The walls were constructed with boulders of sufficient size and <br /> setback. Other details also appeazed to be followed correctly. <br /> The walls addressed in this letter are on the south side of the house in a 2-tiered wall configuration. The <br /> lower wall has a maximum exposed height of about 4.5 feet. The upper wall is approximately 4 to 5 feet <br /> behind the lower wall(face to face distance)and has a maximum exposed height of about 3 feet. Level <br /> slopes are present at the top and bottom of the walls. No other surcharge loads are present on the <br /> retaining walls. <br /> Some industry standard practice references used for this evaluation regarding installation,specifications, <br /> and details include: <br /> - Boulders shall be placed to avoid continuous joint planes in vertical or lateral directions. <br /> - Each boulder shall bear rocks below it with good flat-to-flat contact. <br /> - Install woven landscape fabric behind the boulders to limit soil migration through the wall face. <br /> This evaluation was performed using the design guidelines presented in the third edition of the"Design <br /> Manual for Segmental Retaining Walls"(DMSRVI�published by NCMA in 2009. Direct all surface <br /> LICENSED <br /> PROFESSiONAI <br /> ENGINEERS <br /> HOME&BUILDING INSPECTIONS <br /> STRUCTURALEVALUATIONS <br /> aSSOCIATION RESERVE/TRANSITION STUDIES <br /> RESI DENTIAUCOMMERCIAL <br /> RETAINING WALL DESIGN�EVALUATIONS � <br />