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Report of Geotechnical Exploration and Review <br /> 1105 Ferndale Road West,Orono,Minnesota AMERICAN <br /> June 21,2013 ENGINEERING <br /> Report No.01-05798 TESTING,INC. <br /> The piles should have a minimum wa11 thickness of 0.250 inches. We also recommend the pipe <br /> have minimum yield strength of 45 ksi. The piles should be equipped with a steel plate at the pile <br /> tip and be filled with 3,000 psi concrete after driving. <br /> You may receive alternate bids from pile contractors during the bidding process. Other pile <br /> diameters and wall thicknesses could be considered on this project. If other pile types are <br /> proposed,please contact us for additional consultation. <br /> Pile driving, and to a lesser extent general construction activities, will cause some vibrations <br /> which could affect the neighboring building. We recommend determining the foundation system <br /> of the neighboring house prior to construction. We also recommend monitoring during <br /> installation of the piles using a vibration seismograph. If needed, changes in the hammer/driving <br /> ` system can be made to reduce vibration intensities during pile driving. Even then, it is possible <br /> i <br /> that some minor cracking in portions of the existing structure may occur. <br /> b.4 Helical Piers <br /> I <br /> As an alternative to driven piles, the new building (including a structural floor slab) could be <br /> supported on a deep foundation system using helical piers (such as A.B. Chance helical piers or I <br /> Atlas helical piers). <br /> Since helical piers aze proprietary systems, the pier size, number of piers, installation depths, <br /> design capacity, and settlement estimates would be determined by the installation contractor you <br /> select and their Engineer. We recommend that a negative load (down drag) be included in the <br /> design. If grout is placed around the helical pier shaft,the drag load should consider the diameter <br /> of the grout collar. We recommend that you contact Atlas Foundation Company at (763) 428- <br /> 2261, Veit Companies at (763) 482-2242, or Carl Bolander & Sons at (651) 224 6299 for more <br /> Page7of10 <br /> � <br />