d
Created 2009-08-31T15:40:48.185Z, last edited 2009-08-31T15:40:53.544Z

d
The gray sludge is the silt that the land in Bangkok is made of. This is no good for the house foundations so they dig down until they hit the real earth, which is the yellow coloured soil. Each of the foundation piles needs to make contact with this in order to be stable.
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