Report of Geotechnical Exploration & Review-2013

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Report of Geotechnical Exploration and Review 1105 Ferndale Road West,Orono,Minnesota AMERICAN June 21,2013 ENGINEERING Report No.01-05798 TESTING,INC. Underlying the swamp deposits, we encountered glacial till to the boring termination depths. The glacial till consist predominantly of sandy lean clay. 5.3 Ground Water We measured ground water in our three borings at depths ranging from about 4%2 to 6 feet below grade. The near surface soils on this site are relatively slow draining soils and an extended period of time would be required for the water level to reach equilibrium. Given more time, it is our opinion that the ground water level would have risen to about the lake elevation. Ground water levels fluctuate due to varying seasonal and annual rainfall and snow melt amounts, as well as other factors. 6.0 RECOMMENDATIONS �, 6.1 Discussion We found sigmficant buried swamp deposits at our borings. These swamp deposits are highly susceptible to consolidation under any new(or even recent) load increases. Load increases could be caused by fill being place for grading or from new structures. Based on the consolidation test that was done and assuming the new building is supported on conventional footings and a slab- on-grade, we estimate total settlement could be on the order of 4 to 8 inches. Therefore, we recommend that the proposed building (including a structural floor slab) be supported on a deep foundation system. Our primary recommendation would be to use driven pile as the deep foundation system. Since there is an existing house very close (about 12 feet) to the proposed house, vibration may be a concern for this project. If it can be determined that the existing house is supported on pile, then the vibrations from pile driving may be acceptable. If the foundation system for the neighboring Page 4 of 10