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<br /> J e n g i n e e r i n g
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<br /> November 19, 2002
<br /> City Of Orono 6`"`°``"� �'��
<br /> Attn: Bruce Vang .,,_,�
<br /> P.O. Box 66 '':"'° 2 i ����
<br /> Crystal Bay, MN 55323 �`�"�-��r'��ipNO
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<br /> Orono, MN
<br /> Dear Mr. Vang:
<br /> I have been asked to validate the structural stability of the recently constructed boulder wall at
<br /> the Stewart & Gina Hansen residence in Orono. The residence is located at 583 Park Lane.
<br /> I have received photographs from the contractor along with a summary of the wall construction
<br /> (attached). Based on the provided information, the wall meetings all minimum safety factor
<br /> requirements for overturning, sliding, and bearing capacity. The wall appears to be well
<br /> constructed, with minimal vertical joints at any point along the wall. The contractor has properly
<br /> diverted water flow from the wall by extending the wall 4-6" above grade, and incorporating a
<br /> drain tile to divert runoff and the roof drainage from the wall. In my professional opinion, the
<br /> wall contractor has constructed the wall properly, and the wall should function safely.
<br /> If you have any questions, please feel free to give me a call.
<br /> Since ly
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<br /> Micha� Johnson, PE
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<br /> Telephone 952.294.4755 • Fax 952.294.4595 • 8200 Humbolclt Avenue South • Suite 21 7 • Bloomington • Minnesota 55431 • mrjengineering.com
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