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Bremer Financial Corporation <br />Project B2008939 <br />November 17, 2020 <br />Page 15 <br /> <br /> <br />Inspections of site grading and engineered fill placement. The purpose of these Special I nspections is to <br />evaluate whether the work is in accordance with the approved Geotechnical Report for the project. <br />Special Inspections should include evaluation of the subgrade, observing preparation of the subgrade <br />(surface compaction or dewatering, excavation oversizing, placement procedu res and materials used for <br />engineered fill, etc.) and compaction testing of the engineered fill. <br /> <br />C.3. Spread Footings <br /> <br />Table 7 below contains our recommended parameters for foundation design. <br /> <br />Table 7. Recommended Spread Footing Design Parameters <br />Item Description <br />Maximum net allowable bearing pressure (psf) 4,000 <br />Minimum factor of safety for bearing capacity failure 3.0 <br />Minimum embedment below final exterior grade for heated <br />structures (inches) 42 <br />Minimum embedment below final exterior grade for <br />unheated structures or for footings not protected from <br />freezing temperatures during construction (inches) <br />60 <br />Total estimated settlement (inches) Less than 1 inch <br />Differential settlement Typically about 1/2 of total settlement* <br />*Actual differential settlement amounts will depend on final loads and foundation layout. We can evaluate differential <br />settlement based on final foundation plans and loadings. <br /> <br /> <br />C.4. Option B: Ground Improvement (with Aggregate Piers) <br /> <br />Based on the anticipated depth of excavations (about 9 to 12 feet below existing grades) needed to <br />remove the existing fill and organics from the building area, it may be more economical to consider the <br />approach of leaving most of the fill in place and performing a ground improvement process. Ground <br />improvement can be accomplished with aggregate piers or stone columns, commonly known by trade <br />names such as: Geopier, Vibro Piers, Vibro Stone Columns, etc. <br />