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_ AET #20-02044 - Page 9 <br /> <br />RECOMMENDATIONS <br /> <br />Building Grading <br /> <br /> Excavation <br /> <br />To prepare the building areas for structural support, we recommend removing the topsoil or <br />swamp deposits and the very soft or very loose to soft fine or mixed alluvium, when presem near <br />the existing ground surface (N-value less than 5) to expose the underlying competent soils. <br />Excavation of the deeper very loose silty sands or clayey sands at Borings//3, #6, and #9 should <br />not be required (as discussed in the "Approach/Discussion" section). The following table <br />indicates the recommended minimum excavation depths and anticipated bottom elevations at the <br />boring locations. <br /> <br />1 929.3 4~/~ 925 <br />2 944.9 1 944 <br />3 924.0 2 922 <br />4 930.3 1 929% <br />5 918.3 I~A 917 <br />6 913.6 6* 907~A <br />7 922.1 1/~ 9211~ <br />8 913.3 8 9051,6 <br />9 911.6 8** 903¥6 <br />10 920.2 11/~ 919 <br />11 908.2 6 902 <br /> <br /> <br />