... subsurfaceconditions observed, the intent of Table 1 regardingthe minimum level of exploration needed should becarried out. The depth of borings indicated in Table 1performed before or during design ... be: Great enough to fully penetrate unsuitablefoundation soils, e.g., peat, organic silt, orsoft fine grained soils, into competentmaterial of suitable bearing resistance,e.g., stiff to hard ... analyses indicatethat acceptable results are provided and that theanalyses are not particularly sensitive to the selectedparameters, the Engineer may be comfortable withconcluding the analyses....