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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 /> November 4, 2013 <br /> Lincoln Danforth <br /> Yardscapes, Inc. <br /> 8609 Harriet Ave. So. <br /> Bloomington, MN 55420 <br /> RE: Limestone Block Retaining Wall Evaluation <br /> 3205 Graham Hill Road <br /> Orono, Minnesota <br /> Project No. 13-1067 <br /> Dear Mr. Danforth: <br /> This letter is being sent per your request regarding the recently constructed limestone block retaining <br /> walls at 3205 Graham Hill Road in Orono, Minnesota. This evaluation is based on observations I made <br /> during a site visit on November 4, 2013, construction progress photos provided by you on October 29, <br /> 2013, and verbal statements made to me by you regarding construction means and methods. <br /> The construction of the retaining walls, including the tiered walls, appears to be structurally stable and in <br /> general conformance with boulder/stone retaining wall and construction industry standards. The walls <br /> were constructed with boulders of sufficient size and setback. Other typical construction details such as <br /> use of drainage elements and filter fabric also appeared to be followed correctly. As is normal for boulder <br /> retaining walls of this type, some wall movement and soil settlement should be expected. <br /> I recommend that gutters and downspouts be installed on the house in order to direct the roof runoff away <br /> from the retaining walls. Surface water should also be directed away from the walls. <br /> This evaluation was performed using the design guidelines presented in the third edition of the"Design <br /> Manual for Segmental Retaining Walls" (DMSRW)published by NCMA in 2009. If soil conditions, <br /> proposed layouts, or other design parameters vary from that assumed a revised analysis might be needed. <br /> Please call me if you have any questions or need more information. Thank you. <br /> Sincerely, <br /> Paul Schimnowski, PE <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 />