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Jun O1 21 11 : 25a LSamstadItascaEngineering (9521445-2106 P, 2 <br /> r y '�"`�` '�^�r,: ; �„'�.�. <br /> � ���' ;��'�� � � � <br /> s�:�- i a� , , <br /> June 2, 2005 <br /> ITASCA ENGINEERING, Inrc. <br /> 1342 TENTH AVENUE EAST <br /> SHAKOPEE, MN 55379 <br /> 952-445-79g3 <br /> Mr. Eric Dunaway <br /> Boulder Works, Inc. <br /> 5535 North Arm Drive <br /> Nfinnetrista, MN 55364 <br /> Re; Retaining �Vall at Single Family Residence, 2920 Fox Street, Orono, MI�1. <br /> Dear Mr. Dunaway: <br /> I have inspected the above premises with you and the Landscape Site Plan —�,I. you Were to instal] <br /> several boulder retaini.ng walls. You have agreed to install them according to my directions. The <br /> retain�ng wall should consists of the following: <br /> � Large boulders, approximatel}�2 ft in average dia�neter, installed over a cut face that ranged from 2 <br /> to 12 feet in height. <br /> • The lowest row of boulders was buried at least 1.S feet below the lower ground surface and became <br /> the foundatioa for the upper portion of the wall. The reason for bur,vitig the first layer was to <br /> stabilize the upper rows of boulders. <br /> • The face of the boulders should set bad<at least I S degrees from the vertical. <br /> � The boulders were to be placed on a porous 6Iter mat laid against the prepared clean sand face. <br /> • Horizontal drain tile to be placed behind the wall an brought to `daylight' towards the horizontal <br /> ends of the wall. <br /> � Roof drains for the house were to be installed uuder and tltrough the low�er tier of wall boulders. <br /> • At the time of my visit grading, sodding and final Iandscaping had not been completed, but the <br /> lower boulder were beginning to be put in place as I directed. <br /> � Keep any concentrated surface drainage &om flowing across and over the wal!. <br /> If these specifications are foliowed the retaining watls should be safe and will keep erosion frorn <br /> oecurring on the cut surface and also stabilize the soii that lies behind the wall. I hereby eertify that <br /> this letter re_port been prepared by me and that I am a duly registered Professional Civil Engineer <br /> under the taws of the State of Minnesota. If you have any further questinns or if I can be of any <br /> further assista�ice, please do not hesitate to phone or write, If necessary, I will inspect and approve the <br /> wall when they are completed. <br /> Sincerely, <br /> I1'ASCA ENGINEERING, Inc. <br /> ��E` �����, <br /> c� ' <br /> � ��� M�,� �� <br /> I.awrence E. Sarnstad,P. ,;�' i gi e , t.71 �` �� �'�� � <br /> ]vlinrt. Reg.No. 6220 �=�ROi"��.:,S;O';,y; � � y� ��,v" �` �� � <br /> Encl. Brief resume. 1 ��•, "t:��::,:;`_�d , � r '�� O� ��.��`�'.�� 5 <br /> '�r:�.: u��, � •�,'; 'V ,{` r� � � yc�v, <br /> ;� +t,.\`4_/ ',v � ��I � ��7" \' �� \�. <br /> `''' ll,:l'����' � 1N� \���'"y.�� �.� �,, ��� <br /> e �>� .� � o <br /> �� <br />