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The latest insurance policy (July 2010) of the BSA has been released with a major change to the way they handle filling in regards to subdivisions- "if  the  proposed  footing  is  supported  on  filling  and  the  engineer's  design  does  not  include  piers  through  the  filling,  irrespective  of whether or not the filling is part of the building contract or Level 1 compaction  certificates  are  available,  the  engineer  has  documented requirements  for  further  testing  of  or  improvements  to  the  filling such that piers are not required, or the engineer has provided written advice of the reason why the engineer has determined that piers are not required."

I am wondering if anyone has any ideas on how to handle "the engineer  has  documented requirements  for  further  testing  of  or  improvements  to  the  filling such that piers are not required"?
The real answer I believe is that you dig down and retest at each layer, but this option will cause more damage than good I believe.

Anyone else got any idea's on this issue?

An expert is a man who has made all the mistakes which can be made in a very narrow field


For those not aware, this is a Queensland issue.  There have been a lot of cases of settlement of houses on fill which was supposed to have been placed as controlled fill, and the QBSA had to reluctantly assume responsibility for repairs.  I think they are trying to make building on filled sites impractical without deep foundations, which may not be a bad thing.  It is certainly a bad thing to have to get involved with the QBSA.

The document which RE quoted is attached.

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