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AET//20-02044 - Page 12 <br /> <br />Based on the conditions encountered, and the recommended compaction levels, it is our opinion <br />the building foundations can be designed based on a maximum allowable soil bearing pressure of <br />2,000 psf. It is our judgment this design pressure will have a factor of safety of at least 3 against <br />localized shear or base failure. We judge that total settlements under this loading should not <br />exceed 1 ". We also judge that differential settlements of conditions depicted by the borings should <br />not exceed ~/~ ". <br /> <br />Floor Slabs <br /> <br />The recommended grading procedures should prepare the building areas for floor slab support. <br />The floor slab can be supported by the new fill that is placed and compacted to grades or the <br />naturally deposited soils. All fill supporting the floor slab should be compacted to a minimum of <br />95 % of the Standard Proctor maximum dry density. This includes all utility and foundation trench <br />backfill. <br /> <br />For recommendations relating to moisture/vapor protection of the slab, we refer you to our <br />standard sheet entitled "Floor Slab Moisture/Vapor Protection" (page 23) at the end of the report. <br /> <br />Building Backfilling <br /> <br />Other recommendations for backfilling the structures appears on two standard data sheets which <br />we have attached to this report. These sheets are entitled: <br /> <br />Freezing Weather Effects on Building Construction (Page 21) <br /> <br />Basement/Retaining Wall Backfill and Water Control (Page 20) <br /> <br />These sheets present information on preferred soil types, frost considerations, drainage, and lateral <br />pressures. <br /> <br /> <br />