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4.2.4.2.(1)
ApplicationIntent
OS2OP2OP4
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.2,OS2.6] [F21-OS2.6]
Application
Application 1: 
Depth and extent of subsurface investigation for the design and construction of excavations and foundation systems.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A and buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A] that are required to be designed to the requirements of Part 4.
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Intent
Intent 1: 
To limit the probability that the subsurface investigation will not be to sufficient depth or extent for the design and construction of the excavation and foundation system, which could lead to insufficient capacity of the foundations or insufficient stability of the excavation, which could lead to structural failure, which could lead to harm to persons.
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