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AMERICAN ENGINEERING TESTING, INC. AET Project No. 22-00012 <br /> Your environmental consultant, Liesch Associates, has performed environmental assessments on <br /> this site, and environmental impacts have been documented. Refer to Liesch's reports for <br /> additional information on the environmental considerations related to site development and <br /> construction. <br /> 3.2 Project Assumptions <br /> Our foundation design assumptions include a minimum factor of safety of 3 with respect to the <br /> ultimate soil bearing capacity. We assume the structures will be able to tolerate total settlements <br /> of up to 1 inch, and differential settlements of up to '/2 inch over a horizontal distance of 30 feet. <br /> The information presented above represents our understanding of the proposed construction. This <br /> information is an integral part of our engineering review. It is important that you contact us if <br /> there are changes from that described so that we can evaluate whether modifications to our <br /> recommendations are appropriate. <br /> 4.0 SUBSURFACE EXPLORATION AND TESTING <br /> 4.1 Field Exploration Program <br /> Our subsurface exploration program included drilling 27 Standard Penetration test (SPT) borings <br /> and seven hand auger borings at this site between February 22 and 28,2006. The locations of the <br /> environment(EP) borings were selected by Liesch. We selected the locations of the geotechnical <br /> (ES) borings. However, both sets of borings were used for our geotechnical report preparation. <br /> We also observed the excavation of 15 test pits at this site on December 11, 2006. The <br /> approximate locations of the borings and test pits are shown on Figure 1 in Appendix A. <br /> Your surveyor, Westwood Professional Services, Inc., staked the boring and test pit locations <br /> and shot the ground surface elevations at the test locations. You contracted Doboszenski & <br /> Sons, Inc. to dig the test pits. Doboszenski backfilled the test pits after we described the soils <br /> exposed on the sidewalls of the pits. Before we drilled, we contacted Gopher State One Call to <br /> Page 4 of 28 <br />