RPEQ Basement Certification Letter

LINDSAY CONSULTING PTY LTD                                                  -


STRUCTURAL AND CIVIL ENGINEERS
ACN 079 744 808 ABN 61 478 386 385 GST REGISTERED
AS TRUSTEE FOR THE LINDSAY FAMILY TRUST




Difficulties in retaining the soil profile and hence the sewer and stormwater mains either
side of the allotment occurred during excavation of the site and removal of the existing
pool.
Based on this it was recommended to maintain the Finished surface levels along the
sides of the site within 100 mm of the adjacent properties existing levels. This meant
that the rear of the site could not be filled so the pool decks were made suspended with
the section over the sewer on the site removable and the existing pre-development soil
profile maintained as much as achievable.
Lindsay Consulting Pty Ltd is of the opinion that the basement condition has been
achieved at the back by creation of the supporting retaining walls with a suspended
slabs.
It should be noted that along the northern and southern boundary the basement condition
was impossible to achieve for the following reasons:

         •    Importing of fill would have been required along the northern and southern
              sides of the development with the fill on the northern side of the development
              being over the existing sewer line, in contravention of the standard practice
              of not filling over the existing sewer line.

         •    The filling would have required extensive retaining along the sides of the
              development with limited space (particularly the sewer side of the
              development) in poor soil conditions with the site erosion.
The engineering solution of not filling the site, maintaining the existing levels as far as
practicable, provision of suspended decks over the pool areas, stabilization of the site
during and post construction and non-provision of retaining wall along the boundaries

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