Attachment B Eng report

6.2 Lateral Resistance

The lateral resistance to wind, earthquake and lateral soil forces will
be provided by a combination of reinforced concrete and blockwork
bracing walls, contiguous piled walls, column/beam framing action.
Raking tension and compression piles will be designed and RPEQ
certified by others based on their own design-installation methods
and shall have the capacity to safely resist horizontal loads from
wind, earthquake and lateral soil pressures, with a permanent
factor of safety against sliding exceeding 2.0.

It is clear that the construction of the fully strutted and braced deep
contiguous piled walls will add significantly to the general stability of
the slope and of the areas uphill from all sections of new work,
including the adjacent properties.

6.3 Drainage

The areas behind the contiguous piled retaining walls will be
drained by the use of vertical perforated “wick” drains at
approximately 6m centres, connected through the piled wall just at
the underside of the floor slab level.

The design will include 100mm sleeved agricultural drain lines in
gravel and geotextile at the bottom of all retaining walls and under
all floor slabs in cut areas throughout the building.

Properly designed temporary and permanent drainage and silt

collection must be installed to avoid the risk of surface sands
washing off site, during and after construction of the project.

BARRY GEORGE - MIE(Aust). CPEng. NPER3, RPEQ 1924

TOD CONSULTING ENGINEERS

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