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increases to allowable soil pressure

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To all those geo-tech type guys:
 
Why is it that 1997 UBC Table 18-I-A allows increases of soil bearing due to width and depth, and every soils report that I have ever seen, never allows these types of increases?   The reports only allow the increase due to short term loading / total loading.
 
Thanks for the input,
 
 
Pat Clark, P.E.