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Civil Solutions <br /> _ \ <br /> Gro;.�,�. r.t C.�. <br /> May 11, 2010 <br /> Cinda Collins <br /> 650 Big Island <br /> Orono, MN 55413 <br /> Re: 650 Big Island <br /> Retaining Wall Review <br /> Dear Cinda: <br /> As requested, Civil Solutions Group (CSG)has conducted a review of the existing boulder wall <br /> located at 650 Big Island in Orono. The purpose of the review was too specifically to determine the <br /> long-term stability of the boulder wall near the staircase that exceeded 4' in height. <br /> The specific wall in question has been constructed to meet all minimum safety requirements as set <br /> forth in both AASHTO and NCMA. The wall has more than adequate depth for the given wall <br /> height. The wall is backfilled with sand, the proper fabric placed up the back of the�vall, and there <br /> is drain tile properly placed. The overall construction of the wall is outstanding, having very tight <br /> joint spacing and very aesthetically pleasing. <br /> It is my professional opinion that the wall meets all minimum engineering standards and will <br /> function safely as constructed. <br /> If you have any questions, please feel free to give me a call. <br /> Sin er y <br /> Michael R. Johnson, PE <br /> www.clvflsolutlonsgroup.com � 8200 Humboldt Avanua South,Suite 100,Bloomington,Minnesota 55431 • Telaphone(952)294.4755 Fax(952)294.4585 <br />