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Depth Embedment in earth
IBC 1807.3.2.1
d(ft)= 0 OK<12'
Δtrial(ft)= 12 

Lateral Bearing Pressure
IBC Table 1806.2
Sp(psf/ft)=
IBC_2015, CHAPTER 18 see REF link below.
d=Depth of embedment in earth in feet but not over 12 feet for purpose of computing lateral pressure.